system requirements well intervention equipment

NORSOK STANDARD

SYSTEM REQUIREMENTS WELL INTERVENTIONEQUIPMENT

D-002Rev. 1, October 2000

This NORSOK standard is developed by NTS with broad industry participation. Please note thatwhilst every effort has been made to ensure the accuracy of this standard, neither OLF nor TBL or

any of their members will assume liability for any use thereof. NTS is responsible for theadministration and publication of this standard.

Norwegian Technology CenterOscarsgt. 20, Postbox 7072 Majorstua

N-0306 Oslo, NORWAY

Telephone: + 47 22 59 01 00 Fax: + 47 22 59 01 29Email: [email protected] Website: http://www.nts.no/norsok

Copyrights reserved

System requirements well intervention equipment D-002Rev. 1, October 2000

NORSOK standard Page 1 of 68

CONTENTS

FOREWORD 2INTRODUCTION 2

1 SCOPE 5

2 NORMATIVE REFERENCES 5

3 TERMS, DEFINITIONS AND ABBREVIATIONS 73.1 Definitions 73.2 Abbreviations 7

4 GENERAL REQUIREMENTS 84.1 General 84.2 Design principles 84.3 Design principles references and standards 84.4 Verification, testing and marking 134.5 LCC and regularity 154.6 Process and ambient conditions 154.7 Layout and working environment requirements 154.8 Special requirements for skid base structures 164.9 Utility interfaces 164.10 Operational requirement 17

5 WELL INTERVENTION WELL CONTROL SYSTEM 185.1 Equipment configuration 185.2 Equipment requirements 215.3 Control system 30

6 SNUBBING EQUIPMENT 356.1 General 356.2 Snubbing equipment requirements 366.3 Data acquisition system 396.4 Power package 406.5 Circulating system 406.6 Well control system 406.7 Workstring and BHA 41

7 COILED TUBING EQUIPMENT 427.1 General 427.2 Coiled tubing equipment requirements 427.3 Power package 467.4 Coiled tubing workstring (steel coiled tubing) 467.5 Coiled tubing reel 477.6 Control cabin 487.7 Data acquisition system 497.8 Well control system 497.9 BHA 50

8 WIRELINE EQUIPMENT 518.1 General 518.2 Wireline equipment requirements 51



8.3 Control cabin 528.4 Data acquisition 528.5 Clamps/sheaves and hay pulleys 538.6 Power package 538.7 Pressure test pump 548.8 Wellhead pump 548.9 Well control system 548.10 Logging container (for logging and well tractor) 548.11 Wireline mast (crane) 548.12 Transport and storage racks for wireline equipment 548.13 Slick, braided and electrical line requirements 558.14 Down hole tools requirements 55

9 DOCUMENTATION 569.1 General 569.2 Specific well intervention requirements 58

ANNEX A 60

(informative) 60

DATA SHEET SNUBBING EQUIPMENT 60

ANNEX B 63

(informative) 63

SAFETY HEAD REQUIREMENTS, COILED TUBING AND SNUBBING OPERATIONS 63

ANNEX C 65

(informative) 65

SNUBBING AND COILED TUBING WELL CONTROL SYSTEM RIG UP 65

ANNEX D 66

(informative) 66

WIRELINE WELL CONTROL SYSTEM RIG UP 66

BIBLIOGRAPHY 67



FOREWORD

NORSOK (The competitive standing of the Norwegian offshore sector) is the industry initiative toadd value, reduce cost and lead time and eliminate unnecessary activities in offshore fielddevelopments and operations.

The NORSOK standards are developed by the Norwegian petroleum industry as a part of theNORSOK initiative and supported by OLF (The Norwegian Oil Industry Association) and TBL(Federation of Norwegian Manufacturing Industries). NORSOK standards are administered andissued by NTS (Norwegian Technology Center).

The purpose of NORSOK standards is to contribute to meet the NORSOK goals, e.g. to developstandards that ensure adequate safety, value adding and cost effectiveness and thus are used inexisting and future petroleum industry developments.

The NORSOK standards make extensive references to international standards. Where relevant, thecontents of a NORSOK standard will be used to provide input to the international standardisationprocess. Subject to implementation into international standards, the NORSOK standard will bewithdrawn.

Annexes A, B, C and D are for information only.



INTRODUCTION

The main objective of this NORSOK standard is to contribute to optimise the design of well serviceand intervention facilities, their systems and equipment with respect to utilisation, operationalefficiency, life cycle cost and to stipulate acceptable safety levels.

NORSOK standard D-002 is an overall improvement and expansions of the former standards forcoiled tubing, snubbing and wire line equipment, and replace the following NORSOK standards:

D-SR-005 Coiled tubing equipment, revision 1 January 1996 D-SR-006 Snubbing equipment, revision 1 January 1996 D-SR-008 Wireline equipment, revision 1 October 1996



1 SCOPE

This standard describes the design, installation and commissioning principles and requirements forthe well intervention equipment and their systems and equipment.

2 NORMATIVE REFERENCES

The following standards include provisions which, through reference in this text, constituteprovisions of this NORSOK standard. Latest issue of the references shall be used unless otherwiseagreed. Other recognized standards may be used provided it can be shown that they meet or exceedthe requirements of the standards referenced below.

NPD RegulationsNORSOK D-001, Drilling facilities.NORSOK E-001 Electrical systems,NORSOK E-002 Adjustable speed motor drives.NORSOK H-001 HVAC Heating, ventilation and air conditioningNORSOK N-001, Structural design.NORSOK N-003, Actions and action effects.NORSOK S-001, Technical Safety.NORSOK S-002, Working Environment.NORSOK S-003, Environmental Care.NORSOK Z-010 Installation of Electrical, Instrument & TelecommunicationNORSOK Z-015, Temporary Equipment.

ISO 10423 Petroleum and Natural Gas Industries Drilling and Production Equipment Specification for Valves, Wellhead and Christmas Tree Equipment

ISO 10424 Petroleum and Natural Gas Industries Drilling and production equipment Rotary drilling equipment

ISO 13533 Petroleum and Natural Gas Industries Drilling and production equipment Specification for drill through equipment

ISO 13535 Petroleum and Natural Gas Industries Drilling and production equipment Hoisting equipment

ISO 13626 Petroleum and Natural Gas Industries Drilling and production equipment Drilling and well servicing structures Specification

ISO 14693 Petroleum and Natural Gas Industries Drilling and production equipment Drilling equipment

API Spec 4F Drilling and well servicing structuresAPI Spec 5CT Specification for Casing and Tubing (U.S. Customary Units)API Spec 6A Specification for Wellhead and Christmas Tree EquipmentAPI Spec 7 Specification for Rotary Drill Stem Elements (replace with ISO 10424 when

issued)API Spec 7K Specification for Drilling Equipment



API Spec 8C Specification for Drilling and Production Hoisting Equipment (PSL 1 and PSL2), (replace with ISO 13535 when issued)

API Spec 9A Specification for Wire RopeAPI Spec 16A Specification for Drill Through Equipment, (replace with ISO 13533 when

issued)API Spec 16C Choke and kill systemAPI Spec 16D Specification for Control Systems for Drilling Well Control Equipment.

BS 308: Parts 1, 2 & 3 Recommendations for geometrical tolerancing.BS 449 Specification for the use of structural steel in building. Metric units.BS 4656: Part 1 Accuracy of machine tools and methods of test. Specification for lathes,

general purpose typeBS 4656: Part 2 Accuracy of machine tools and methods of test. Specification for copying

lathes and copying attachmentsBS 4656: Part 3 Specification for the accuracy of machine tools and methods of tests. Milling

machines, knee and column type, horizontal or vertical spindle plainBS 4656: Part 4 Specification for the accuracy of machine tools and methods of test. Milling

machines, bed type, horizontal or vertical spindleBS-7072 Code of practice for inspection and repair of offshore containers

NACE-MR-0175, Sulphide Stress Cracking Resistant Metallic Materials for Oilfield Equipment.NACE-TM-0177 Labory Testing of Metals Resistance to Sulfide Stress Cracking and Stress

Corrosion Cracking in H2S Environment. Item no 21213

ASME VIII Div. 1 and Div. 2, Pressure vessel code

NS 3472 Steel structures Design rulesNS 5820, Suppliers documentation of equipment.

DNV Offshore standard OS-E101 Drilling PlantDNV Lifting Appliance

ANSI/ASME B31.3 Process Piping

ANSI/AWS D1.1 Structural Welding Code - Steel

ASTM-E466-82 Standard Practice for Conduction Force Controlled Constant Amplitude AxialFatigue Tests of Metallic Materials

ASTM-E468-90 Standard Practice for Presentation of Constant Amplitude Fatigue Test Resultsfor Metallic Materials

ASTM-E739-91 Standard Practice for Statistical Analysis of Linear or Linearized Stress-Life(S-N) and Strain-Life (e-N) Fatigue Data

ASTM-A450 Standard Specification for General Requirements for Carbon, Ferritic Alloy,and Austenitic Alloy Steel Tubes

IEC 60068 Environmental testing

FEA-M Forskrifer for elektriske anlegg. Maritime installasjoner. Norsk Vassdrags ogEnergiverk (NVE).



3 TERMS, DEFINITIONS AND ABBREVIATIONSFor the purpose of this NORSOK standard, the following terms, definitions and abbreviations apply.

3.1 Definitions

3.1.1barrierenvelope of one or several dependent barrier elements preventing fluids or gasesfrom flowing unintentionally from the formation, into another formation or to surface

Shall: Verbal form used to indicate requirements to be followed in order to conformto the standard.

Should: Verbal form used to indicate that among several possibilities one isrecommended as particularly suitable, without mentioning or excluding others,or that a certain course of action is preferred but not necessarily required.

May: Verbal form used to indicate that among several possibilities, one is suitable,without mentioning or excluding others, but not necessarily required.

3.1.2qualifiedspecial proof for being fit for the intended purpose

NOTE To be documented by design, calculation and function testing and verified by 3 rd party orindependent surveyor.

3.1.3maximum expected wellhead pressuremaximum shut in wellhead pressure plus additional pressure from well intervention activities

3.2 AbbreviationsBHA bottom hole assemblyBOP blow out preventerBPV back pressure valveCE European Conformity Assessment MarkEEA European Economic AreaESD emergency shut downFAT factory acceptance testHVAC heating ventilation and air conditioningLCC life cycle costMTBF mean time between failureMTTR mean time to repairNPD Norwegian Petroleum DirectorateUPS un-interruptable electrical power supplyANSI American National Standards Institute



ASME American Society of Mechanical EngineersASTM American Society for Testing and MaterialsBS British StandardsDNV Det Norske VeritasNACE National Association of Corrosion EngineersNS Norsk StandardFEA-M Forskrifer for elektriske anlegg. Maritime installasjoner. Norsk Vassdrags og Energiverk

(NVE).

4 GENERAL REQUIREMENTS

4.1 GeneralThe well intervention equipment shall be designed, built and equipped in compliance withapplicable regulations and this NORSOK standard.

4.2 Design principlesAn overall objective for well activities shall be the requirement that no single failure shall entail alife-threatening situation for the involved personnel, or significant damage to material and theenvironment. This applies both to operational errors and to failure in connection with equipmentused directly in operations, as well as equipment with auxiliary functions.

The objectives shall constitute the basis for definition and revision of the acceptance criteria for riskin connection with well activities, and for the choice of risk reducing measures.

System and equipment are to be protected against excessive loads and pressure.

System and equipment are to provide two independent levels of protection to prevent or minimisethe effects of a single malfunction or fault in the process equipment and piping system, includingtheir controls.

Different types of safety devices to reduce the probability for common cause failures should providetwo levels of protection.

All equipment shall be located to ensure safe operation and, if located in hazardous areas, shall besuitably protected for installation in such areas. Reference is made to NORSOK standard Z-015regarding relevant discipline requirement for design and installation of service containers, such asfire and gas, electrical, HVAC, etc. for temporary equipment.

The facilities shall be designed to minimise risks of personnel injuries, environmental hazards andeconomic loss. Reference is made to NORSOK standard S-001, NORSOK standard S-002,NORSOK standard S-003 and NPD Regulations.

4.3 Design principles references and standardsNORSOK, ISO and API standards constitute a good starting point as regards referencedocumentation when designing well intervention equipment.



Planning, design, fabrication, operation and maintenance of well intervention equipment shall beaccording to documents listed in Table 1, Table 2, Table 3, Table 4 and Table 5.

Table 1 SnubbingNote: ( ) means standards under preparationEquipment Norsok ISO API OtherSubstructures /masts / gin pole

N-001 (13626) 4F NS-3472 Steel structures Design rulesBS-7072 Code of practice for inspection andrepair of offshore containersDNV Lifting ApplianceDNV Offshore standard OS-E101 DrillingPlant

Pipe handlingsystem;

DNV Offshore standard OS-E101 DrillingPlant

Jack/pulling unit; (13535) 8C DNV Offshore standard OS-E101 DrillingPlant

Rotary / powerswivel

(13535) 8C DNV Offshore standard OS-E101 DrillingPlant

Work window N-001 (13626) 4F NS-3472DNV Offshore standard OS-E101 DrillingPlant

Slip bowls /carriers

(13535)(14693)

8 C7K


Make up / brakeout tongs

(14693) 7K DNV Offshore standard OS-E101 DrillingPlant

Winch package /hoisting equipment

9A DNV Offshore standard OS-E101 DrillingPlant

Circulating swivel (10423)(15156)

6A NACE-MR-0175DNV Offshore standard OS-E101 DrillingPlant

Kelly valves (13535)(10424)(15156)

8C7

NACE-MR-0175DNV Offshore standard OS-E101 DrillingPlant

Workstring (10424)(11960)

75CT

BHA 9001:Chapter4.5 4.7& 4.16

BS 308: Parts 1, 2, & 3.BS 4656: Parts 1, 2, 3, & 4.



Table 2 Coiled Tubing

Norsok ISO API OtherSubstructures N-001 NS-3472

BS449BS7072DNV Lifting ApplianceDNV Offshore standard OS-E101 DrillingPlant

Injector head w/Tubing guide arch(gooseneck),Injector supportframe(s) & Injectorlifting frame

N-001NS-3472BS-449BS7072ANSI B31.3AWS D1.1DNV Lifting ApplianceDNV Offshore standard OS-E101 DrillingPlant

Coiled tubingworkstring (steelcoiled tubing)

(11960)

(15156)9001

5CT,5C7

NACE-TM-0177NACE- MR- 0175

ASTM-E466-82ASTM-E468-90ASTM-E739-91ASTM-A450ASME- sec. VIII Div.1&2

Coiled tubing reel Z-015 NS-3472BS449BS7072DNV Lifting ApplianceDNV Offshore standard OS-E101 DrillingPlant

BHA 9001:,Chapter4.5 4.74.16

BS 308: Parts 1, 2, & 3.BS 4656: Parts 1, 2, 3, & 4.



Table 3 Wireline

Norsok ISO API OtherSubstructures N-001 DNV Offshore standard OS-E101 Drilling

PlantWireline unit Z-015 DNV Offshore standard OS-E101 Drilling

PlantClamps/sheavesand hay pulley;


Pressure test pump Z-015 DNV Offshore standard OS-E101 DrillingPlant

Wellhead pump Z-015 DNV Offshore standard OS-E101 DrillingPlant

Wireline mast(crane)

(13626) 4F

Slick, braided andelectrical line downhole tools

BS 308: Parts 1, 2, & 3.BS 4656: Parts 1, 2, 3, & 4.

Table 4 Snubbing Coiled Tubing and Wireline General

Equipment Norsok ISO API OtherOperator cabin w/Control system &Data acquisitionsystem

H-001Z-015

9241 IEC60068

Hydraulic powerpack

Z-015Z-010

Circulating system (10423)(15156)

6ANACE-MR-0175DNV Offshore standard OS-E101 DrillingPlant

Chiksan / standpipe

(10423)(15156)

6ANACE-MR-0175ANSI B.31.3DNV Offshore standard OS-E101 DrillingPlant

Circulation hoses (15156) NACE-MR-0175ANSI B.31.3DNV Offshore standard OS-E101 DrillingPlant

Liftingrequirements

Z-015

Containers Z-015



Electricalequipment designand installation

Z-010Z-015E-001E-002

FEA-M (1990)

Table 5 Well Control Equipment

Norsok ISO API OtherBOP's for snubbing, coiledtubing and wireline ; stripperrams, blind/shear ram, piperams ( fixed or variable ), sliprams , shear seal rams &safety headwireline ram

(13533)(15156)

16ANACE-MR-0175DNV Offshore standard OS-E101Drilling Plant

Annular preventer (13533)(15156)


Snubbing stripper bowl oractive stripper.

(13533)(15156)


CT dual stripper (13533)(15156)


Gate & plug valves, checkvalves and loops

(10423)(15156)


Stuffing box for solidwireline - Slickline

(10423)(15156)

6ANACE-MR-0175

Grease injection head withrelevant sized flowtubes -Braided cable

(10423)(15156)

6ANACE-MR-0175

Hydraulic line wiper andstuffing box, Open holeoperations

(10423)(15156)

6ANACE-MR-0175

Choke & kill systems(15156)

16CNACE-MR-0175DNV Offshore standard OS-E101Drilling Plant



BOP accumulator unit systemw/ BOP control hoses

Z-015Z-010E-001E-002

16D16E

DNV Offshore standard OS-E101Drilling PlantFEA-M (1990)

4.4 Verification, testing and marking

4.4.1 VerificationVerification of design, fabrication and testing shall be carried out and implemented according to anoverall and clearly defined verification programme and verification basis There shall beindependence between those who carry out the work, and those who are responsible for theverification.

The verification may thus comprise control of calculations, drawings and fabrication by goingthrough what have been done or carrying out independent or own calculations. The verification mayalso include trials or testing of equipment and systems.

By independence means that the verification shall be carried out by someone other than the one whohas performed the work which is to be verified, or the one who has prepared the verification basis,and also that there shall be organisational independence regarding reporting in the chain ofcommand.

An important condition is that the verifying unit has the necessary competence and resources to carryout the verification. Verifications shall be carried out in accordance the requirements in thisNORSOK standard. Consideration of complexity shall be included in the evaluation, as well as theprobability for or the consequences of failure or faults, which may occur.

The verification shall be documented and should comply with issuance of e.g. design verificationreport and product certificate.

4.4.2 Testing requirements for new equipmentThe various vendors shall present a test procedure, including acceptance criteria, prior to the FAT.The procedure shall describe all tests to be carried out during the FAT and procedures forcommissioning and the start-up phase for the equipment as a stand-alone unit.

At FAT the well intervention equipment shall, to the extent possible, be tested as a completesystem, with all subsystems integrated. Loads and signals shall be simulated and recorded.

During commissioning and start-up, the various systems and their drilling instrumentation packageshall be utilised to verify the sensor data.



4.4.3 MarkingEquipment shall be clearly marked as follows with identification and operational limitations,relating the equipment to certificates and fabrication documentation:

Equipment identification: manufacturers name or mark; equipment type no.; equipment serial no.

Operational limitations such as: working load limit; working pressure; maximum voltage; maximum temperature.

There shall be consistency between units used for marking and units displayed on instruments.

CE marking applies to machines and simple pressure vessels on fixed installations.

Machinery placed on the market after 8 April 1995 shall be designed, manufactured anddocumented in accordance with the requirements of the Machinery Directive 98/37/EC/Forskrift ommaskiner Best. nr. 522. The requirement entails that the individual contractor, sub-contractor etc.shall ensure that machinery taken into use has received CE marking and that it is accompanied by adeclaration of conformity.

By marketing (place on the market) is meant the first time a product, against payment or free ofcharge, is placed at disposal with a view to distribution or use within the EEA. The NPD has in co-operation with other authorities, defined the following criteria for when a product is consideredplaced on the market:

when the right to utilize of the product passes over from a manufacture within the EEA area tothe next link in the chain of distribution;

when the equipment is imported from a country outside the EEA area, and the right to utilize ofthe product passes over from importer to the next link in the chain of distribution;

when the equipment was offered and is available for direct sale from the manufacture or from animporter and the purpose was to direct sale to users;

when a manufacturer or an importer takes into use equipment imported by him.

The requirement contained in this section applies only to machinery comprised by the MachineryRegulations. This entails that the requirement applies only to machinery used on fixed installations.The reason for this is that Machinery Regulations are not applicable to ships and mobile offshoreunits.



4.5 LCC and regularityRegularity requirements shall be defined prior to detailed design, based on stability (MTBF/MTTR)and service intervals. The service intervals shall reflect the MTBF. LCC shall be defined for all vitalparts in the well intervention equipment.

4.6 Process and ambient conditionsThe well intervention equipment shall be selected and designed to operate under ambient conditionsprevalent in the intended area of operation, and shall be resistant to well intervention and formationfluids.

4.6.1 Design basisThe equipment shall be designed as required for the following conditions:

ambient temperature, structures: -20 C to + 40 C; ambient temperature, machinery: -10 C to + 40 C; humidity: 100%; for conditions where H2S service is required, NACE MR-0175 applies.

The design basis shall be defined for the following load combinations:

operational load; snow and ice loads; earthquake conditions (optional); impact from transportation; wind conditions; the structure shall as a minimum be designed for continuos operation with regards to hook load,

rotary load for wind speeds up to 30 m/s, 10 min. mean values, considering a reference height of50 m above lowest astronomical tide, unless otherwise specified.

4.7 Layout and working environment requirements

4.7.1 GeneralAll work areas in connection with well intervention equipment shall be arranged to ensure the safetyof personnel and operations, working environment and pollution control, in accordance withNORSOK standard S-001, NORSOK standard S-002 and NORSOK standard S-003 and projectsafety goals.

The layout of the well intervention equipment shall give due consideration to areas that may becritical to dropped objects, especially in connection with materials and equipment handling.

The layout shall ensure that maintenance and service can be carried out in a safe and ergonomicallyefficient way.



4.7.2 Noise protection requirements.Special attention hall be made to requirements defined in the NORSOK standard S-002 for designof cabins, power generation packages, fluid and N2 pumping units and accumulator packages.

The control cabins for snubbing, coiled tubing, wireline equipment and pumping units shall bedesigned to withstand a total outdoor area noise level impact of 90 dB (A) and be designedaccording to values defined in NORSOK standard S-002, annex A, for driller cabins. The total noiselevel shall not exceed 65 dB (A) inside the cabin.

The power packages, fluid and N2 pumping units and accumulator packages for snubbing, coiledtubing and wireline operations shall be designed according to values defined in NORSOK standardS-002. The equipment shall be designed in such a manner that the total noise level from theequipment shall not exceed 82 dB (A) and the equipment shall not contribute to exceed a max areanoise level as defined in NORSOK standard S-001, i.e. 85 dB (A) on pipe deck area.

4.7.3 Material handlingThe layout and design of the well intervention equipment shall ensure safe and efficient transportand handling of equipment and materials. A material handling study should be performed to securesafe and efficient operation.

4.8 Special requirements for skid base structuresThe skidable part of the well intervention rig up frames and structures should be installed on theplatforms integrated skid beams, extending to at least one platform edge to facilitate on/off loadingof modules. The frames and structures shall be designed to suit all relevant load conditions, seeNORSOK standard N-001 and NORSOK standard N-003. The remaining parts of the wellintervention equipment shall be located adjacent to the skidable structure.

Contaminated fluids shall be collected and routed to a dedicated slop tank system. All other fluidsfrom the well intervention equipment, rigged up on top of the skid base substructure, shall bedischarged to the installations drain points.

4.9 Utility interfacesThe well intervention equipment should be supplied with dedicated interface termination points.

Mechanic, electric, hydraulic and pneumatic interface connections shall be compatible with rig orplatform connections.

The following utilities should typically be supplied by the platform facilities to support the wellintervention equipment:

electrical power supply; emergency power supply; fire and gas control interface; emergency shutdown interface; sea, fresh water, steam and hot water; drains;



drains/vents for hydrocarbones; UPS; instrument and plant air; diesel; telecommunications interface; main data bus interface; closed circuit television interface bulk brine; HVAC; methanol; glycol (monoethylene glycol/ diethylene glycol/ triethylene glycol).

4.10 Operational requirement

4.10.1 Maintenance requirementsAll equipment shall be subject to systematic maintenance. This is to ensure that it is in goodcondition if the need should arise for the use of preserved equipment.

The extent of maintenance, which is overdue, should be limited. Prior to start-up of demandingphases of the activities there should not be any maintenance on critical equipment overdue.

In order to maintain an acceptable safety level, it is important that adequate safety routines areestablished in connection with maintenance, e.g. in connection with pressure relief, fire protection,alerting personnel, fencing off areas etc.

The purpose of systematic maintenance is to ensure that:

test conditions for components and equipment are specified; repairs and modifications are carried out in such way that an adequate level of safety is

maintained; experience data are systematically collected and recorded for improvement of equipment and

operations; experience data are reported back to the manufacturer/supplier.

4.10.2 Testing requirementsFunction testing of all components including all accessory equipment shall be performed prior toeach job.

Function testing of the positive and negative weight indicator system shall be performed prior toeach job.

Function testing of all interfaces to permanently installed equipment and systems.

Documentation and verification to be submitted to verify acceptable rig up versus forces andbending momentums, downhole tools, well control system, frames, main equipment and pumpsexpected work conditions inside set safety limits.



5 WELL INTERVENTION WELL CONTROL SYSTEMThis clause describes the mechanical well control system with associated equipment. The wellcontrol system shall comprise equipment as described below:

5.1 Equipment configurationThe BOP system shall as a minimum consist of:

Primary well control system is defined as follows:Equipment External

well controlInternal

well controlSnubbing

Stripper bowl or active stripper. Two stripper rams Equalising loop system One annular preventer Workstring Two back pressure valves in the BHA

XXX

If usedXX

Coiled tubing Dual stripper. Coiled tubing body (string) End connector One dual check valve in the BHA Alternatively plugged end of coiled tubing.

XXXXX

WirelineSlickline operationsStuffing box for solid wireline.

Braided cableGrease injection head with relevant sized flowtubes.

Open hole operationsHydraulic line wiper and stuffing box, if applicable.

Primary well control system for wireline operations isdependant on type and size of line and is located abovethe secondary well control system.

X

X

X



Secondary well control system is defined as follows:Equipment External well

controlInternal well

controlSnubbing

One combined blind/shear ram Two pipe rams ( fixed or variable ) One annular preventer Minimum one choke line outlet Minimum one kill line inlet Minimum one manual gate and/or plug valve on

each choke and kill line and minimum one remotehydraulic operated gate and/or plug valve.Alternatively the remote valve on the kill line can bereplaced with one manual valve and a check valve.

One nipple profile in the BHA One stabbing valve

XXXXXX

XX

Coiled tubing One combined shear/seal ram One pipe ram One slip ram Minimum one kill line inlet Minimum one manual gate valve and/or plug valve

on the kill line and minimum one remote hydraulicoperated gate and/or plug valve. Alternativelyremote valve can be replaced with one manual valveand a check valve.

XXXXX



Slick line Braidedor electric

line

Wireline

One wireline ram One wireline ram (inverted ) A double valved kill inlet connection shall be

included in the rig up during a live well intervention One combined shear/ seal ram

X

X

X

XXX

X

Tertiary well control system is defined as follows:Equipment External

well controlInternal

well controlGeneral

The safety head BOP shall be mounted as close aspossible to the wellhead.

SnubbingOne safety head BOP X X

Coiled tubingOne safety head BOP X X

WirelineOne shear/seal ram (safety head BOP) X XThe need for separate shear/seal ram (safety head BOP ) should on the individual facility beconsidered if the height distance between the valves is short or if remote control valve on the x-mastree is documented as a shear/seal valve.



5.2 Equipment requirements

5.2.1 GeneralEquipment

Snubbing Coiledtubing

Wireline

The internal diameter of the BOP components and riser shall bespecified to suit the intended purpose and capacity of thecompletion diameter as stated in the work program

In cases where appropriate, the BOP can have an internaldiameter less than the x-mas tree bore.

X

X

X

X

X

X

The pressure rating of BOPs, stripper system/bowl, riser, valves,flanges, kill/choke systems of following systems shall as aminimum comply with the maximum expected wellheadpressure.

X X X

Consideration shall be given to H2S protection of the completesystem.

X X X

The BOPs shall be fitted with qualified connections as follows.If alternative connections are used, they shall be qualified andcertified to withstand the required forces and pressure. 1) Flanged connections w/metal to metal seals. 2) Quick union type.

1) 1) 2)

All side connections shall have metal to metal seal and have atleast have 50,8 mm (2 in) nominal size.

X X

Kill line connections shall have metal to metal seal. XWell control hoses and connections from BOP to safe area forsecondary and tertiary well control purpose shall be fire resistant,capable of withstanding 1100C for minimum 3 min. Fire testingshall be in accordance with API 16D.

X X X

The position of the kill and choke outlets should be arranged sothat circulation for well control can be carried out with theworkstring suspended in the BOP and the shear/blind ramclosed.

X X



5.2.2 Pump down plugs, stabbing valves, back pressure and check valves

Equipment Snubbing Coiled tubing

Back pressure valvesA minimum of two BPV installed in workstring.A minimum of four BPVs shall be on work location.The BPVs shall allow balls and darts to pass through.

XXX

Check valvesA minimum of dual check valves installed in workstring.A minimum of dual check valves shall be on work location.The check valves shall allow balls to pass through.

XXX

Pump down plugs and stabbing valvesA minimum of one pump down plug for each nipple sizespecified in workover program shall be on work location.A minimum of two stabbing valves and necessary x-overs shallbe on work location.

X

X

5.2.3 Hydraulic operated stripper and stripper bowl system

Equipment Snubbing Coiledtubing

Hydraulic operated stripperThe stripper system shall be a dual system that can be individuallyand hydraulically controlled from the control cabin.

X

The upper stripper shall be located at shortest possible distancefrom the injector drive chains to minimise buckling potential whensnubbing.

X

Pressure rating in accordance with the needs for the operation. Thestripper sealing elements shall fit the proper temperature and wellpressure range.

X X

The sealing elements and extrusion rings shall be replaceable with X



coiled tubing inside to enable replacement of the sealing elementsin case of a leakThe wear bushings should be replaceable with coiled tubing locatedinside to enable removal of coiled tubing with increased and/or ovalouter diameter and/or other changes in the tubing shape through thestripper by removing the bushings and elements

X

The stripper control system shall be hydraulic operated andincorporate a regulating system to avoid over-pressurisation andcollapse of the workstring.

X X

The hydraulic stripper pressure shall be maintained regardless ofprime mover operation. A backup system incorporating a handpump or air pump system shall be used.

X

An injection port shall be incorporated between the upper and lowerstripper to enable injection of inhibitors and/or lubricants. This portcan also be utilised for flushing prior to leak testing and/ormonitoring of wellhead pressure if required.

X

The connection between the upper and lower stripper can be of aquick hand union design, providing the connection has beenqualified.

X

A hydraulic quick latch type connection should be utilised betweenthe lower stripper and the coiled tubing BOP. Such a quick latchshall on the bottom have a nominal bore minimum equal to thenominal bore of the coiled tubing BOP.

X

A work window may be utilised between the lower stripper and thecoiled tubing BOP. The window minimum nominal bore should beequal to the nominal bore of the coiled tubing BOP. Connections onboth ends of the window can be of a quick hand union type,providing the connections has been qualified.

X

The active stripper system for snubbing shall be hydraulicallycontrolled from the workbasket/control cabin.

X

Stripper bowlGauge and bleed off port on stripper bowl housing for trappedpressure.

X

Stripper bowl shall be prepared to allow for installation of awireline adapter



5.2.4 Stuffing box, grease injection head, hydraulic line wiper and

Equipment WirelineStuffing boxThe hydraulic actuated packing nut to be operated from the hydraulic control panel.Stuffing box shall be equipped with a qualified device preventing hydrocarbon leaksin case of wireline breakage

X

Grease injection headA line wiper and stuffing box to be included in the grease injection head assembly.The grease injection inlet manifold to include a check valve.Integral check valve system to be included and two ports for grease injection.Grease injection head stuffing box shall be equipped with a qualified devicepreventing hydrocarbon leaks in case of wireline breakage

X

Hydraulic line wiperHydraulic actuated rubber element operated from hydraulic control unit. X

5.2.5 Pipe, stripper, slip, tubing, wireline shear blind, shear / seal, safety head rams andannular preventer requirements

Equipment Snubbing Coiledtubing

Wireline

GeneralThe BOPs shall have a mechanical locking system to enablelocking of the rams in closed position.

Indicator pins for open and close status of the BOP shouldbe included.

If remote mechanical locking of BOP is used, indicatorpins can be voided.

The rams shall be dimensioned to suit the actualworkstring and be able to close/open against full wellboreworking pressure.

The rams shall be able to close/open against maximumworking pressure.

The rams shall be capable of centralising without damagingrelevant workstring against side loads.

X

X

X

X

X

X1

X

X

X

X

X

X1

X

X

X

X

X

X2



Pipe, stripper, slip, tubing and wireline rams

The rams shall be able to close around the workstring andseal off the annular space in the BOP bore.

Pipe and slip ram hang off capacity compatible with theworkstring weight.

Front packer on stripper rams shall be wear resistant forstripping.

The slip ram shall be capable of holding the workstring andprevent up and down movement.

The slip ram shall be of a design that minimises or avoidsstress marking of the tubing.

The top and bottom ram for braided and electric line to holdpressure from top and below, a grease injection/test portbetween the rams shall be included.

X1

X

X

X

X

X1

X

X

X

X2

X



Annular preventer

The annular preventer shall be able to close and seal off atmax. shut in / max. expected operating pressure rating onopen hole. The annular preventer shall operate (close) onboth stationary and running objects. Stripping through theannular with the specified workstring shall be possiblewithout damaging the tubular.

The annular preventer shall be furnished with accumulator(s)as a surge dampener for emergency stripping of pipe andtubular.

Accumulator system can be voided if there are no externalupsets on workstring

X

X

If used

If used

Shear/blind ram or seal ram

The shear/blind ram shall be capable of shearing the highest-grade of workstring, as well as sealing off the wellbore withlateral and face seals.

The shear/seal ram shall be capable of shearing the highest-grade of as follows, as well as sealing off the wellbore withlateral and face seals.

The ram design needs to clear sheared workstring from theseal area as a part of the shearing and closing operation, toenable circulation rate through the workstring left in the well.

The shear blades shall be designed to prevent small pipe orcable to be caught between the ram blocks and the wellboreside.

X

X

X

X1

X

X

X2

X

1 Workstring2 Wire



Safety head

The safety head shall be a combined shearing and sealingram capable of shearing the workstring and sealing the borewith the maximum working pressure.

There shall be documentary evidence that the safety headwill shear the intended size and wall thickness of workstring(coiled tubing and snubbing), including any wire, cable orcapillary lines and provide sealing effect after shearing, seeannex B. For wireline the safety head shall be able to cut andseal the wire only.

The shear blades shall be designed to prevent small pipe orcable to be caught between the ram blocks and the wellboreside.

Minimum nominal bore shall be equal to or greater than x-mas tree bore.

Shear and seal capability shall be available when theworkstring is unloaded, in tension, or in compression

X

X

X

X

X

X

X

X

X

X

X

X

X

X



5.2.6 Riser, lubricator, tool catcher and chemical injection subEquipment Snubbing Coiled

tubingWireline

RiserThe riser shall as a minimum have the following specifications:

pressure rating in accordance with the needs for the operation; arrangements to enable bleed off and verify no trapped pressure

to be included.

The riser shall have a minimum number of connections and noinlets or outlets between the safety head and the x-mas tree.

If alternative connections are used, such as on floater operations,the connections shall be qualified to withstand the required forcesand pressures.

X

X

XX

X

X

XX

X

LubricatorThe lower section of the lubricator shall have a minimum nominalbore equal to or greater than BOP internal diameter. Arrangementsto enable bleed off and verify no trapped pressure to be included.

X

Tool catcherThe tool catcher shall be of failsafe type spring catch/hydraulicrelease design.

X

Chemical injection subThe chemical injection sub injection inlet manifold shall include acheck valve. The liquid chamber shall be made of soft material(brass or equivalent).

X



5.2.7 Piping and hook-up valves to well control systemEquipment Snubbing Coiled

tubingWireline

Piping and hook-up valvesAll piping and hook-up valves to the well control system shall havea pressure rating in accordance with the needs for the operation.The piping and valves to treating and flowing lines should beminimum 50,8 mm (2 in) nominal size.

Kill line for wireline should be minimum 50,8 mm (2 in) nom size.

All outlets and inlets on the BOP system shall have metal to metalseals. The outlets and inlets shall be fitted with at least two valves.1) All outlets and inlets.2) All outlets and inlets below shear/seal ram.

The valves shall be bi-directional and the inner valve, closest tothe wellbore, should be flanged and have metal to metal sealingin the bore (gate valve type).

Threaded connections are permissible only downstream the firstvalve away from the well and riser bore.

One of the two valves on outlets and inlets for treatment orflow lines shall be remotely operated. On the kill line, a manualoperated valve and a check valve can replace the remotelyoperated valve.

The inner valve shall not be used as a working valve.

Check valves, if used, shall be of a flapper or cone design.

Ports for pressure monitoring, injection, etc in and below secondarywell control, shall have connections with metal to metal seals, andbe double valved with metal to metal seals in the bore. Valves andconnections may be of a threaded design.

Any redundant outlets may be blocked with blind flanges or plugswith metal to metal seals instead of two valves.

X

1)

X

X

X

X

X

X

X

X

2)

X

X

X

X

X

X

X

X

2)

X

X

X

X

X

Circulating, standpipe, equaliser and bleed off linesEqualising loop on stripper rams assembly to incorporate ahydraulic pressure de-booster with remote measuring of wellpressure.

Workbasket and/or cabin gauge to monitor pressure betweenstripper rams.

X



5.2.8 Choke manifoldThe choke manifold shall, both for snubbing and coiled tubing as a minimum includetwo chokes, manual or remote controlled.

In the case of manually operated chokes, the circulating pressure and the choke manifold pressureshall be displayed on or close to the manifold. All pressure indicators gauges should be throughhydraulic pressure deboosters with remote output.

The manifold should also be fitted with a connection facility for an optional pressure gauge withlow increment readings.

Lines and hoses between the BOP stack and the choke manifold system shall, together with theirconnections and valves on the high pressure side of the choke manifold, as a minimum have thesame working pressure rating as the BOP stack.

All valves should be gate valves.

5.3 Control systemThe operation of the primary well control system can be from one control panel.

The operation of the secondary well control system shall be from minimum two control panels, onecontrol panel located at the operator's workstation, and one control panel located in a safe area.

The operation of the tertiary well control system shall as a minimum be operated from a safe area.

The accumulator unit(s) to operate the secondary and tertiary well control system shall be located ina safe area in order to avoid exposure in the event of an uncontrolled well control situation, i.e.away from the well area and close to an escape way. The rig-floor is normally not considered as asafe area. The control panel(s) for operating the secondary and tertiary well control systems may beintegrated into the BOP accumulator unit(s).



5.3.1 GeneralThe control system shall consist of the following for Snubbing, Coiled tubing and Wireline:

Control panels which clearly indicates (e.g. Indicator with status of the functions shall beincluded by means of lights or selector valve) information for the panels whether the functionsare in open or closed position

The control panels with motion selector valves and switch buttons shall be equipped with asecuring device against unintentional operation of essential functions (e.g. shear ram). Accidentaloperation shall not occur.

The BOP control system and panels shall be equipped with alarms for low accumulator pressure,loss of power and low level of control fluid.

Regulators in the system shall remain unaffected in the event of loss of power.

BOP ram operating pressure shall as a minimum be regulated from the BOP accumulator unit.

Maximum response time when the BOP is located on a surface installation, 30 seconds.

Response time refers to the time it takes from the closing function is activated from the panel,until the BOP function is in closed position.

Stripper ram maximum response time for snubbing: 5 seconds

Equaliser, bleed off, kill line and choke line valves maximum response time for snubbing: 1second

The accumulator capacity for operating a BOP stack with associated systems shall as a minimumhave sufficient volumetric capacity to close, open and close all the installed BOP functions plus 25% of the volume for one closing operation for each one of the said BOP rams.

The following BOPs operated from the well control system shall be used as basis when calculatingthe accumulator capacity:

Snubbing Coiled tubing Wireline Annular preventer Upper pipe ram Shear/blind ram Lower pipe ram Equaliser loop valve Bleed off valve Kill line valve Choke line valve

Shear/seal ram Pipe ram Slip ram

Wireline ram Wireline ram Shear/seal ram

There shall be documentary evidence that the pressure capacity of the accumulators is capable ofoperating the rams according to the design requirements.



As a minimum for dimensioning total accumulator volumes and capacities (isotherm, adiabatic slowcharge and fast operation) shall be included.

Snubbing Coiledtubing

Wireline

Accumulators shall have sufficient pressure capacityto enable cutting of the relevant workstring. Thereshall be sufficient remaining accumulator pressure toenable cutting, after having used a volumecorresponding to as follows:

Workstring Coiledtubingstring

Wire/cable

Closing and opening of one Annularpreventer

N/A N/A

Closing, opening and closing of one Pipe ram Pipe ram Wirelineram

Alternatively a dedicated shear ram auxiliary pressure system (shear boost system) may be installedto meet the minimum requirements to cut the workstring if the remaining accumulator pressure isnot sufficient to enable cutting after having performed operations as described above.

The accumulator system shall be separate from all other hydraulic circuits, i.e., only the well controlsystem can take fluid from the storage accumulators.

The accumulator system shall be designed such that the loss of an individual accumulator and/orbank will not result in more than 25 % loss of the required total accumulator system capacity.

The control panels shall have an ergonomic layout and be designed according to NPD Regulationsand NORSOK standard S-002



5.3.2 Function requirements for accumulator unit and panels for primary and secondarywell control functionsPanel located on the BOP accumulator unit and panel (located in the operator cabin/workbasket) to be equipped with functions for as follows:

Snubbing Coiled tubing WirelineRegulators for as follows: Acc. unit Work

basketcabin

Acc. unit Coiledtubingcabin

Acc. unit Wirelinecabin

BOP ram activationpressure-manifold pressure.Annular preventer regulator.Active stripper regulator.Upper stripper regulator.Lower stripper regulator.

X

XIf used

If used

XIf used

X

If used

If used

If used

XX

If used If used

Alarms for as follows:Low accumulator pressure.Loss of power supply.Low level of control fluid.

XXX

XXX

XXX

If usedIf usedIf used

XXX

If usedIf usedIf used

Pressure monitoring:Accumulator pressureBOP ram activation/manifold pressure.Annular preventer pressure.Active stripper pressure.Upper stripper pressure.Lower stripper pressure.

XX

XIf used

XX

XIf used

XX

If used

XX

If used

XX

XX

XX

Basic BOP ram/valve openand close functions:Annular preventer.Stripper ram 1.Stripper ram 2.Upper pipe ram.Shear/blind ram.Lower pipe ram.Equaliser loop valve.Bleed off valve.Kill line valve.Choke line valve.

Shear/seal ram.Pipe ram.Slip ram.

Wireline ram.Wireline ram (inverted).

XXXXXXXXXX

XXXXXXXXXX

If used

XXX

If used

X

XXX

X

XX

X

XX



Flow monitoring:BOP fluid monitoring. X X X X X X

Optional BOP ram/valveopen and close functions:Active stripper.Deployment functionsSeal/slip ram.Blind ram.Locking holding ram.Disconnect ram.Auxiliary valve.

X

XXXXX

X

If usedIf usedIf usedIf used

XXXX

BOP accumulator bypass:BOP accumulator unit shallbe equipped with a bypassfunction for allowingaccumulator pressure tobypass the regulatedmanifold pressure.

X If used

Additional controlfunctions:Grease injection to BOP.

X X

5.3.3 Grease injection skid/hydraulic control skid for wirelineThe grease injection skid shall as minimum include two pumps and grease tanks. The capacity shallas minimum be 0,25 l/min per pump at maximum pump pressure.

5.3.4 Tertiary BOP control system (for safety head) for snubbing, coiled tubing andwirelineThe basis for design of the BOP accumulator unit for operating the safety head(defined as the tertiary well control system) is the same as for the BOP accumulator system tooperate the secondary well control functions.

This includes accumulator capacity design, BOP hoses design, shear boost (if used) system,regulators and monitoring of pressure internal on the unit, alarms, volume monitoring (flow) andindicator status on open and close functions.

5.3.5 Choke control system for snubbing, coiled tubing and wirelineOperation of a remote controlled choke, if installed, shall take place from a suitable panel. Thepanel shall at least indicat

circulating pressure (workstring / coiled tubing internal pressure); choke manifold pressure; choke position indicators; volume pumped; well fluid pump rate.



6 SNUBBING EQUIPMENT

6.1 GeneralThe snubbing equipment with associated systems shall be capable of handling the workstring, wellconditions and other work parameters specified by the work program. This clause describes theminimum functional requirements for snubbing equipment.

The snubbing well intervention system will normally consist of the following main items:

snubbing units/snubbing units with derrick/mast type structures pipe handling system; jack/pulling unit; work window; slips; tong post/tongs; winch package; gin pole; workbasket and operator cabin; circulating system; control system; data acquisition system; hydraulic power pack; well control system; workstring and BHA.

The system shall be designed to and be capable of handling tubular such as, but not limited to, in anefficient way:

drill and workstrings; casing and tubing strings; high pressure risers and associated equipment (optional); BOP stacks and x-mas trees (optional).

Requirement for modularization shall be specified.

The system design shall allow for performing Wireline work and electric logging operations withinthe workbasket/snubbing unit working platform area, considering space, height, equipmenthandling, access to the equipment and weather protection.

The equipment should be equipped with a four point lifting arrangement for both horizontal andvertical handling of modules where applicable.



6.2 Snubbing equipment requirements

6.2.1 Snubbing units / snubbing units with derrick/mast type structuresThe derrick, mast or hoisting structure shall be designed to withstand the loads and forces imposedby the relevant operational and environmental loads. In addition, the structure can be used forsupport of pipehandling equipment, and support for racked tubular on setback areas if applicable.see NORSOK standard N-001.

Access in connection with operation and maintenance of equipment shall be catered for by suitableand safe access from deck or installed work platforms. From current practice it follows that thevarious work platforms in structures (including platform for installation of casings) shall beadequately equipped with safety devices, lifts, stairs or ladders for safe access, see NORSOK D-001standard.

Lubrication points with difficult access in the workover area, such as sheaves, shall be routed to areadily accessible area. Sufficient number of hang off points of required capacity for travellingassembly, manual rig tongs and work winches shall be installed. All hang off points and/or padeyesshall be properly marked with safe working load, and the design shall ensure that safe working loaddoes not exceed 20 % of the breaking load.

The snubbing unit working platform area shall in relevant areas be designed for dropped objectprotection, i.e. to withstand the impact from the heaviest expected tubular falling from a height of1,5 m.

All permanently manned working areas shall be weather protected. The primary work area shall becovered with a non-skid material.

The substructure shall be designed to form an adequate foundation for the structure/mast or hoistingstructure and the snubbing unit working platform area, and provide required elevations and handlingspace for BOPs and optional x-mas trees etc. The substructure shall be designed to withstand allcombined loads from, mast or hoisting structure and snubbing unit working platform area with fullloading, BOP handling loads, if applicable, as well as equipment installed in the substructure itself.

The complete design shall be considered for lubrication (space out) of applicable BHA such asrunning and pulling perforating and gravelpack assemblies when rigged up on a live well.

6.2.2 Pipe handling systemThe snubbing unit shall be equipped with a remote pipehandling system to include

vertical pipehandling system; horizontal pipehandling system; horizontal to vertical pipehandling system.

The workbasket/snubbing unit work platform area shall be unmanned and equipment remotelyoperated in normal drilling and tripping operations. The horizontal transportation system and thehorizontal to vertical transportation system shall be remote operated with the possibility for



stowage, make up, break out and suspension of workstring, collars, casings and tubing in therotary table;

transport of workstring, casing, collars etc. to and from storage location in front of V- door tothe snubbing unit working platform area. The complete string of tubular shall be stored on alocation where it require no platform crane handling between the storage location to thesnubbing unit workbasket/working platform area (drillfloor).

An anti collision system should be installed to prevent collision between the main hoistingequipment, the pipehandling equipment and structures.

6.2.3 Jack/pulling unitThe snubbing unit shall have a pulling and pushing (snub) capacity to the maximum expected andanticipated load for the operation.

Rotary head or top drive shall be protected.

The hydraulic hoses to the unit shall have sufficient lengths to position the hydraulic support systemat the required distance from the well area. All hoses in suspension from a connection shall beequipped with quick disconnect complete with locking feature including dust plug and cap.

The unit shall be equipped with an anti buckling guide tube system to support the workstring andthe inside diameter to suit actual workstring

6.2.4 Work windowThe unit shall contain a work window assembly and the height shall be according to therequirements in the work program.

Window shall be designed with load rating equivalent to the jack and/or pulling unit with feature forhanging off the workstring.

There shall be a work platform at the work window level.

6.2.5 SlipsThe slips design rating shall be equivalent to at least the maximum thrust of the jack/pulling unitsystem and shall be remote operated.

Unit shall be equipped with dual redundant stationary snub slips.

The slips shall be equipped with a cross port relief valve system to prevent hydraulic andmechanical damage in the event of forced opening of equivalent function.

6.2.6 Tong post/tongsTongs shall be remote operated.

If an old system with conventional tongs are used the following applies:



the height from the tong post arm to the workbasket handrail shall be adequate to accommodatethe power tong and with a suspension and trolley arrangement to allow swinging of tong awayfrom the centre line;

tong suspension arrangement to allow the introduction of a spring to prevent overload of tongarm during make-up of tubular joints;

to incorporate tong backup attachment eye, rated at the maximum horizontal force resultingfrom the maximum tong torque capacity.

One set of tubing tong with slide heads for both tong and back-up to fit the tube and upsetconnection of the workstring.

6.2.7 Winch packageThe dual type counterbalance winch package shall if used be skid mounted with drip pan.

The winch package to contain an automatic fail-safe brake in the event of hydraulic failure and thesafe working load on the winch shall be determined by the work program.

Winch package can be voided if design of unit do not require such system.

6.2.8 Gin poleWhere a gin pole system is required, it shall be able to extend to such a height that the distance fromthe bottom of the gin pole sheaves to the workbasket (handrail) is sufficient to accommodate thepipe length (Range II or III) plus safety valve, circulation swivel, swivel with tackle including areserve air gap of minimum 1,0 m (3 ft).

The system shall contain a hydraulic arrangement for raising and lowering of the gin pole.

6.2.9 Workbasket and operator cabinIf the jack and pulling unit is designed with a workbasket, the travelling head area shall be equippedwith removable internal handrail to guard against the rotating workstring. Personnel safety andworking environment shall be given due consideration.

The workbasket shall have two independent escape exits and be equipped with wind walls forweather protection, and a workstring mark board in the workbasket area for operator quick referenceof workstring depth.

The layout of the operator cabin shall ensure full operational control and view from the operatorsposition to the various parts of the work floor area.

The control cabin shall have an ergonomic layout and be designed according to NPD Regulationsand NORSOK standard S-002.

The control cabin shall facilitate all necessary controls and monitoring equipment to operate thecomplete snubbing unit and well control equipment as defined in clause 5.

Control cabins shall satisfy the following requirements:



the operator cabin shall have an ergonomic layout and shall be equipped with laminated glass,oil resistant wiper or cleaner and a suitable mechanical ventilation system;

the roof and windows shall have adequate strengthening or protection against falling objects. due consideration to be given to visibility on control system visual display unit screens; jack "snub" and "heavy" force limitation shall be pre-set at power pack manifold local

adjustments in workbasket and cabin shall not override the pre-set value; there shall be individual hydraulic circuits for jack, pipe-handling system, BOP and auxiliary

system. Each circuit shall have an adjustable pressure safety relief and pressure indicator; interlock shall be provided to prevent inadvertent opening of the stationary and the travelling

heavy slips simultaneously. It shall be possible to manually over ride this interlock.

The controls and monitoring equipment shall as a minimum include the following:

torque control for rotary or top drive; rotary/top drive speed adjustment; rotary/top drive direction control; power package speed control; power package shut down; power package ESD, selector for operating jack by two of four cylinders (option); jack direction control lever; slip bowl control levers; slip pressure regulator; weight indicator (heavy and snub force); wellhead pressure; circulating pressure.

6.3 Data acquisition systemThe snubbing unit shall be equipped with a data acquisition system to display and record operationalparameters. The data-sampling rate shall be sufficient to record relevant variations in the displayedand recorded parameters. A system for analyzing the recorded data shall be available at the location.

The snubbing unit shall be equipped with a data acquisition system to monitor and record thefollowing parameters:

time and date; workstring weight, positive and negative (heavy and snub); jack hydraulic system pressure; wellhead pressure; workstring pressure; workstring depth; rig and slip hydraulic pressure; rotary torque and rpm. workstring connection torque; optional: volume control; optional: pump speed.



In addition, there shall be a back-up system, which records

workstring weight (positive and negative); wellhead pressure; workstring pressure.

6.4 Power packageTwo independent power packages are required at the work site. Minimum one unit shall be dieseldriven and capable of supplying sufficient power to operate all operating systems of the snubbingunit on a continuos basis and at peak demand.

The power package shall be designed and sound proofed in accordance with NPD Regulations.

Provisions shall be made for a manual ESD system that is operated locally and remotely from theworkbasket/control cabin.

The power package shall be certified for operating in Zone II areas and in accordance withNORSOK standard Z-015.

Provisions shall be available for remote and local control. Individual adjustment and pre setting ofthe operating limits for maximum pull and push forces to the snubbing unit shall be possible. Theseshall be protected from adjustment during normal operating conditions.

If the power package is used for charging the accumulator system for the well control equipment,the hydraulic circuit from the well control accumulators shall be separate from the other hydrauliccircuits. Only the well control system shall be able to take hydraulic pressure from the dedicatedaccumulators.

6.5 Circulating systemThe circulating swivel and circulating hose working pressure to comply with operationalrequirement. The integral 90 gooseneck with lift eye shall if used be compatible withcounterbalance winch.

Pin connection on swivel shall be compatible with the safety valve requirements.

Minimum circulating hose length shall be equal to one single joint and end connection equippedwith safety clamps and chain.

6.6 Well control systemWell control system to be according to clause 5.



6.7 Workstring and BHA

6.7.1 GeneralThe workstring shall meet the operational requirements with respect to maximum anticipatedpressure, temperature, torque, tension and compression. The workstring shall be inspected and averification report shall be issued stating approved and found suitable for operation as a minimum.

The tubing shall have documented tracability. A pipe tracking system may provide documentedtracability.

During operations the workstring limitation for over pull shall be set to 80% of manufacture'stensional yield/torsional yield of the workstring.

For live well interventions, the type of connection for use in the workstring above the BPVs (checkvalves) to meet the requirement of minimum two independent gas tight metal- to - metal seals. Theseals to withstand internal and external pressure.

Drifts (2 each size), stabbing guides (2 each size), necessary x-overs and overshots for fishing theworkstring components shall be included.

6.7.2 Back pressure valve (BPV)The BPVs prevents well fluids from entering into the workstring. The BPV is a barrier element andshall have a working pressure rating equal to the expected wellbore pressure. The BPVs shall beprovided with seals in the bore towards the BHA and provide internal and external seal.

Provisions shall be made for pumping balls through the BPVs.

6.7.3 OthersAll other equipment or tools in the BHA shall be qualified and designed to withstand all expecteddown hole forces and conditions.



7 COILED TUBING EQUIPMENT

7.1 GeneralA coiled tubing unit with associated systems shall be capable of handling the workstring, wellconditions and other work parameters specified by the work program. This clause describes theminimum functional requirements for a coiled tubing unit with associated equipment.

The well Intervention system for coiled tubing will normally consists of the following main items:

injector head; tubing guide arch (gooseneck); injector support frame(s); injector lifting frame; power package; coiled tubing workstring (steel coiled tubing); coiled tubing reel; control cabin; data acquisition system; well control system; BHA.

7.2 Coiled tubing equipment requirements

7.2.1 Injector head

7.2.1.1 GeneralThe injector head shall have a pulling capacity of 140 % of the maximum expected load for theoperation and pushing (snub) capacity of 120 % of the maximum anticipated load for the operation.

7.2.1.2 Base structure and outer frameThe injector head base structure shall be designed to withstand the maximum rated pull and pushloads from the injector. The base structure shall also be equipped with drip trays and drains fordraining spill.

The outer frame structure shall provide a base for the tubing guide arch and injector lifting sling.The outer frame structure shall be designed for lifting the total weight of the injector head includingthe stripper assembly, BOPs, BHA and lubricator/riser system as required for the operation.

Provisions shall be made for anchoring at minimum four anchor points or alternative system withequal strength according to design criteria for the system to be used.



7.2.1.3 Drive chain systemThe drive chain system shall be capable of handling the maximum weight of the workstring withminimum damage.

The drive chain shall be easily replaceable in the field or be equipped with replaceable gripperblocks.

7.2.1.4 Traction systemThe traction system shall provide variable gripping force designed to minimise tubing damage andprevent tubing slippage.

The traction force shall be adjustable from the control cabin and be capable of generating sufficientfriction to push or pull the workstring at maximum rated loads without slippage or damage to theworkstring.

The traction system shall have a fail-safe device preventing loss of traction pressure in case of abroken hose.

The traction system shall be provided with an accumulator system for each traction circuit at theinjector head.

Provisions shall be available to provide traction in the event of power supply failure.

7.2.1.5 Tension systemThe chain tension system should be adjustable from the control cabin and be capable of tensioningthe injector chain sufficiently to avoid damage to bearings and the coiled tubing workstring.

The tension system should be provided with an accumulator system at the injector head.

7.2.1.6 Hydraulic drive systemThe hydraulic drive system shall provide accurate fine movement control of the tubing in and out ofhole during maximum load conditions.

Provisions shall be available at the injector head, control cabin or power unit, for individualadjustment and pre-set of the operating limits for maximum pull and push forces to the injectorhead. These shall be protected from adjustment during normal operating conditions.

The hydraulic drive system shall be capable of pushing or pulling the maximum rated load at aspeed of 10 m/min.

The hydraulic system shall be fail safe and stop the chains from moving if hydraulic power is lost.

Charts for hydraulic pressure with corresponding load and available hydraulic pressure shall beprovided.

Provisions shall be made for hydraulic drive lockout when the reel brake is engaged.



7.2.1.7 Brake systemThe brake system shall be capable of holding the maximum rated loads and be fail safe so that thebrakes will stop the chains from moving and hold the load in case hydraulic power is lost.

7.2.1.8 Weight indicatorThe weight indicator system shall be capable of measuring all tensile and compressive forces(positive and negative weights) in the workstring above the stripper. Provisions shall be made foradjusting zero to compensate for the weight of the injector and BHA when required. The weightindicator system shall not be affected by conditions such as temperature changes or radio signals,etc.

The injector head weight indicator system shall be equipped with a fail-safe transport-lockingdevice, i.e. the transport locking device shall either be fully locked or fully open.

Provisions shall be made for easy replacement of the weight indicator in the field and a back-upweight indicator system shall be provided.

7.2.1.9 Depth counter systemAt least two independent depth counters (one at the injector and one at the reel) shall be provided.

The injector head should be equipped with a system for monitoring tubing and chain slippage.

Provisions shall be made for installing a 3rd party depth counter system for logging services.

7.2.2 Tubing guide arch (gooseneck)

7.2.2.1 Mounting and support systemProvisions shall be made for easy installation and removal of the tubing guide arch on top of theinjector head.

The tubing guide arch and support base shall be designed to withstand the forces imposed by theback-tension from the reel. On floating vessels the vessel movement will generate additional forcesthat has to be accounted for.

A weak point may be built in to the tubing guide arch system for operations on floating installations.The strength of the tubing guide arch must be documented.

Provisions shall be made for safe access of all the top rollers of the tubing guide arch.

7.2.2.2 Guide arch size (radius)The minimum bending radius should as a guideline be 48 times the workstring diameter. Other sizestubing guide arch radiuses may be used if the fatigue life of the workstring is rated accordingly.Reference is made to recommendations provided in API RP 5C7 [27].



7.2.2.3 Guiding systemThe tubing guide arch shall be provided with shaped rollers or a similar system for guiding theworkstring into the injector. A system to prevent the workstring from sliding off sideways shall alsobe included.

Provisions shall be made for allowing the workstring to enter or exit the tubing guide arch tangentto the curve of the tubing guide arch.

Provisions shall be made for allowing the workstring to enter or exit the tubing guide arch from theangle made by spooling the workstring across the width of the reel. The tubing guide arch shallsupport the side loads.

7.2.3 Injector support frameThe injector support frame system will normally be utilised for non-derrick operations.

The injector support frame system should be designed to withstand the expected dynamic, static andbending forces it will be subjected to during normal operations. The operational limits for thesystem shall be clearly identified to enable operation within the design criteria. When the injectorsupport frames are designed to transmit the load from the coiled tubing to the deck duringoperations, the maximum pull- and snub force capacity of the injector head shall be included in thedesign.

Provisions should be made for moving the injector 3 ways (up and down and sideways in north-south and east-west directions).Work platform(s) to access relevant working areas shall be provided.

Provisions should be made for handling and make/brake of BHA.

Provisions shall be made for anchoring at minimum four anchor points or alternative system withequal strength according to design criteria for the system to be used.

Provisions shall be made for anchoring personnel safety harness at suitable areas.

7.2.4 Injector lifting frameThe injector-lifting frame will normally be utilised for floating vessels and semi-submersibleoperations.

The lifting frame shall withstand the maximum anticipated loads for the operation. It shall contain awork window in which the injector head, stripper and BOP can operate isolated from the motion ofa floating vessel.

The lifting frame should have an integrated hydraulic or electric winch/system for independenthandling of the injector, well control equipment and other hook-up equipment. Air operated winchsystems for lifting the injector head should be avoided. The winch/system shall be remotelyoperable from the work platform in the lifting frame and/or from the rig floor. It shall be capable oflifting the injector head with a speed that is higher than the vertical motion of the rig. The loadcapacity shall minimum be 30 % above the weight of the injector head assembly above the quick



connector plus the weight of the heaviest anticipated BHA and the forces required to open/unlatchthe quick connector.

The lifting frame should have an integrated hydraulic man rider winch that is remotely operablefrom the work platforms in the lifting frame and/or from the rig floor.

Work platform(s) to access relevant working areas shall be provided.

The lifting frame shall have a system to guide and prevent horizontal movement of the injectorduring operations.

Provisions should be made for handling and make/brake of BHA in the lifting frame.

Provisions shall be made for anchoring personnel safety harness at suitable areas.

7.3 Power packageThe power package shall be capable of supplying sufficient power to operate all operating systemsof the coiled tubing unit on a continuous basis and at peak demand.

The power package shall be designed and sound proofed in accordance with NPD Regulations andNORSOK standard S-002.

Provisions shall be made for a manual ESD system that is operated locally and remotely from thecontrol cabin.

The power package shall be certified for operating in Zone II areas and in accordance withNORSOK standard Z-015.

Provisions shall be available at the injector head, control cabin or power unit, for individualadjustment and pre-set of the operating limits for maximum pull and push forces to the injectorhead. These shall be protected from adjustment during normal operating conditions.

If the power package is used for charging the accumulator system for the well control equipment,the hydraulic circuit from the well control accumulators shall be separate from the other hydrauliccircuits. Only the well control system shall be able to take hydraulic pressure from the dedicatedaccumulators.

7.4 Coiled tubing workstring (steel coiled tubing)The workstring shall have documented tractability, see API RP 5C7 [27] for guidance.

The workstring shall have documentation of fatigue cycle history, weld location, tapers, length,property de-rating and inspection record.

The workstring shall meet the operational requirements with relation to maximum calculatedpressure, temperature, hydraulics, tension and compression. A tubing force calculation shall beperformed for each operation.

The workstring shall be leak tested and drifted prior to each mobilisation. Workstring with e-lineinstalled may be drifted if applicable.



The workstring shall be quality checked (continuously inspected) and a verification report shall beissued stating the status and suitability for the upcoming operation(s) prior to each mobilisation. Thetubing quality check shall as a minimum include wall thickness, surface condition, outside diameter,corrosion, ovality and ballooning.

The workstring should be inspected continuously during the operation to maintain a real time stringcondition record. The inspection prior to mobilisation may be omitted if the workstring iscontinuously inspected during the operation.

The workstring shall never exceed more than 80 % of manufacturer's specified yield strength asnew. Any de-rating shall be according to recognised standards, e.g. API RP 5 C7 [27]

A system for maintenance and preservation (internal and external) of the workstring shall be inplace.

7.5 Coiled tubing reelThe coiled tubing reel shall be equipped with drip tray(s) and drains.

Access and work platforms shall be provided at suitable areas for normal operations.

The drive system shall be capable of driving the reel faster than the maximum (operating) speed ofthe injector head. It shall provide the required tension necessary to bend the workstring over theguide arch and onto the reel and provide sufficient torque to accelerate the reel drum from stationaryto maximum (operating) speed with the reel drum fully loaded of workstring filled with fluid.

The reel drive system shall be variable, adjusted and controlled from the control cabin.

The coiled tubing reel core diameter shall, as a minimum be 48 times the coiled tubing diameter. Asmaller core diameter can be utilised providing the fatigue life of the workstring is de-ratedaccordingly.

The level wind system shall be designed to withstand the bending and side load forces from theworkstring. A guiding system with an override function shall be provided for proper spooling of theworkstring on and off the reel drum.

The level wind system should be equipped with a remotely operated tubing clamp.

The coiled tubing reel shall have a reel brake system that automatically engages with loss ofhydraulic power. This system must have provisions for manual override when operating on floatingvessels/semi-submersibles.

The coiled tubing reel shall have a brake system that is designed to prevent operation of the injectorhead when the coiled tubing reel brake system is engaged.

An additional brake system should be installed and to be activated in the event of drive gear orchain failure. This could either be a capillary brake system or an additional drive motor with internalbrake.



The coiled tubing reel shall be equipped with a depth counter.

The coiled tubing reel shall have a pig and ball launcher system by-pass and an isolation valvebetween the launcher and workstring end termination. The launcher system shall have an internaldiameter equal to or greater than the internal diameter of the workstring.

The workstring reel end termination shall be a qualified connection.

The coiled tubing reel shall be provided with additional piping as follows: Inlet and isolation valves,swivel joint, pressure sensing device and connection point for pressure relief valve.

7.6 Control cabinThe control cabin shall have an ergonomic layout and be designed according to NPD Regulationsand NORSOK standard S-002.

The control cabin shall facilitate all necessary controls and monitoring equipment to operate thecomplete coiled tubing unit.

The controls and monitoring equipment shall as a minimum include the following:

a) injector head; in hole- and out of hole control; traction control; tension control; high/low gear or displacement control (when applicable); emergency traction control; injector drive pressure supply pressure; in hole- and out of hole pressure; traction pressures; tension pressure; depth counter; weight indicator (positive and negative weight); wellhead pressure.

b) coiled tubing reel; reel forward and reverse control; reel back tension control; level wind override (right and left) control; level wind rise and lower control; reel brake control; circulating pressure; reel back tension pressure; reel brake pressure.

c) power package; normal stop control; ESD control;



engine throttle control; priority supply pressure.

d) stripper; upper and lower stripper control; upper and lower stripper pressure.

e) BOP. shear and seal ram control; pipe ram control; slip ram control; BOP accumulator pressure supply; BOP control pressure; BOP fluid volume control (flow meter) (see also well control system clause 5).

Provisions shall be available at the injector head, control cabin or power unit, for individualadjustment and pre-set of the operating limits for maximum pull and push

system requirements well intervention equipment

Documents

general requirements

intervention requirements

environment requirements

special requirements

reservedsystem requirements

control system rig

intervention equipment

equipment configuration