Marine Riser SystemsChevronTexaco – BP Training Alliance

Floating Drilling

Marine Riser SystemsChevronTexaco – BP Training Alliance

Floating Drilling

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The design of casing and wellhead systems should be performed with the complete wellhead system – including the riser.

Integrating …Wellhead, BOP and Riser Design

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Guideline Type Drilling System

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Connector to Housing Interface

Guidebase/GRA Interface

Housing Interface

Mudmat Interface

Guidelineless Drilling Systems

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MS-700 Family of Wellhead Systems

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H-4 Family of Wellhead Connectors

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BOP and Lower Marine Package

Courtesy of Hydril Company

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Lower BOPw/ Frame

Courtesy of Hydril Company

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Blind -Shear Rams

Upper Pipe Rams

Middle Pipe Rams (Varible)

Lower Pipe Rams

Super Shear Rams

(Varible Bore)

LMRP Mandrel

Annular

Lower BOPw/o Frame

Kill Line

Choke Line

Accumulators (x4)

Courtesy of Hydril Company

Wellhead Connector

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Lower Marine Riser Package

(LMRP)

Courtesy of Hydril Company

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Lower Marine Riser Package

(LMRP)Riser Adapter

Single Flexjoint

Annular

Control Pod(1 of 2)

Mud Boost Line

LMRP Connector (H-4)

Courtesy of Hydril Company

Choke Line Stab

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Funnel Down (Optional)

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Hydrate Protection

GrooveGroove

PN H12025-2 (16-3/4" Wellhead)PN H12025-3 (Super Wellhead)

Fiber Reinforcement

Rubber

Hydrates must be prevented from entering the bottom of the connector. Ice formed from hydrates will prevent the connector from releasing

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Hydrate Protection(Methane Gas)

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ROV Hot StabInlet Thru

Wash Ports

Outlet Thru Wash Ports

Hydrate ProtectionPlum H4 To Inject Freezing Inhibitor

Glycol Inhibitor

Cavity Capacity32 Gallon

SHD H-4 Wellhead Connector

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Type of Well

Exploratory Wells

Disposal

Non-Disposal

Developmental

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DP

Moored

Wellhead Re–Entry Systems

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2004 Subsea Wellhead Angle

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Riser Deployment and Retrieval

Environmental conditions

Location

Season

Vessel

Deployment / Retrieval

Riser fatigue life

Currents

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Riser Handling and Lifting Gear Capacity

Substructure

Derrick

Drawworks

Hook block

Handling gear

Riser Running Tool

Riser Gimble Shock Absorber

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API Riser Coupling ClassAPI RP 2R establishes riser coupling classes based on the tensile capacity of the coupling. These are;

2.5F

4.0J (Proposed)

3.5H

3.0G

2.0E

1.5D

1.25C

1.0B

.5A

Tensile Capacity in millions of pounds

API Riser Coupling Class

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MR-6E Riser CouplingEasy stabbing, fast makeup, and positive alignmentSuitable for operating in water depths up to 7,500 ft depending on environmental and well control conditions; MR-10 designs can operate in depths to 10,000 ft.Preloaded connection significantly reduces the range of alternating stresses induced by cyclic loading to improve fatigue lifePrimary load path for tensile and bending loads through the dogs and into the body, does not impact actuating screws

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MR Riser Running Tool

18o Tapered Drill pipe Connection

4-1/2” IF API Connection

MR Box Connection Profile

Lift / Handling Eye

Choke, Kill & Auxillary Test Caps

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HMF Riser Coupling

Ideal for deep water applications where high load operating conditions existStepped diameter design of pin and box simplifies engagement, even with severe vessel movementNo loose parts preventing bolt loss and potential thread damageField removable and replaceable nose pieceLocking bolts preloaded in excess of rated coupling loads to extend fatigue load of riser system

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HMF Riser Running Tools

Handling Lift Eye

HMF Male Connection Profile

Mechanical Running Tool

Hydraulic Running Tool

Casing Elevator Lift Shoulder

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Riser Handling Tool

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Hydraulic-gate riser spider is used when running or retrieving HMF riser joints through the rotary table.

MR-style riser handling spider supports the riser string on manual or hydraulically operated sliding dogs.

Spider

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Gimbal

Gimbal shock absorber supports up to 2,000,000 lb and gimbals when the riser is positioned in the spider.

Reduces impact loads when running and landing marine riser joints.

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Single Flex Jointwith Mud Boost Line

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Flex JointsSingle Flex Joint & Intermediate Flex Joint

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Riser Extension

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Key Riser Components and Inspection

Prepped for Buoyancy

Drilling Riser

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Installation of Syntactic Foam Buoyancy Moduleson a Riser Joint

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90’ (27.4m) Riser Joint(w/ Spreader Bar)

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Telescopic Joint

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Telescopic Joint

Available for both multiple riser systemsCompensates for heave and offset of the vesselMaximum rated riser tensile load capacity in locked positionHydraulic latch release for inner and outer barrels availableDual split/solid packer elementsFixed or rotating integral/non-integral tensioner ringsSDL, SLS, KT and SDC tensioning rings

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Primary Components of Telescopic Joint

The outer barrel sub assembly has several functions:Providing a means to apply tension to the Marine Riser / BOPFluid assist bearing to allow rig rotationTension ring to eliminate the tensioner wire removalDual packer assemblyKill, choke and Auxiliary line supply assembly

The inner barrel sub assembly functions:Providing communication between the vessel and the BOP during drillingContains an Auto latch system to lock inner/outer barrelSplit lock nut for easy servicingCross-over flange to riser connection and diverter Fully extended can support 1.5m lbs

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Hydraulic Latch

Slipjoint / Telescopic Joint

Split Lock Nut

Inner Barrel

Crossover to Riser Connector

Dual Packer Inner Barrel Latch

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Fluid Assist Bearing

SLS Tension RingKill & Choke & Hydraulic Supply Terminations

Slipjoint / Telescopic Joint

SDL Tension Ring

KT Tension Ring

Options

Options

Options

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Type SDL Riser Support Ring

Saves rig time by eliminating tensionerwire removal

Stored below diverter and allows the rest of the riser to be pulled through

Contains two sets of hydraulic dogs One to latch to diverter for storageThe other to latch to outer barrel while drilling

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The primary function of a diverter is to divert shallow gas through overboard piping before the installation of the BOP stack. This vents the well and protects the formation before it is capable of handling closed-in pressure from the installed BOP. After the BOP is installed it is used to vent gas in the riser, above the BOP.

Diverter System

There are two primary models of Vetco Gray diverters used on floaters:

KFDS – using an expandable rubber packerKFDS- CSO – using a collapsible rubber element

There is one primary model of diverter used on Jack-ups and Platform rigs :

KFDJ – using an expandable rubber packer

Diverters are available in 39-1/2”, 49-1/2” and 60” nominal sizes

Pressure ratings range from 500 to 1000 psi

Hang-off capacities range 500 kips – 2000 kips

In Floater Operations

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KFDS Diverter System

Rotary Table

Control Lines/Block

Insert Packer

Crossover to Riser Connector

Flex Joint

Diverter Assembly

Flowline Seals (x2)

Flowline

DiverterLockingDogs

Diverter Housing

Pressure Rating (Wellbore): 500 PSIDiverter Operating Pressure:

Normal 750 psi ( 52 bar)Maximum 1500 psi (103 bar)

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KFDS Diverter System

Control Lines/Block

Insert Packer

Diverter Assembly

Flowline Seals (x2)

Flowline

DiverterLockingDogs

Diverter Housing

Pressure Rating (Well bore): 500 PSIDiverter Operating Pressure:

Normal 750 psi ( 52 bar)Maximum 1500 psi (103 bar)

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Diverter Assembly

Packer Element

Divert Line

Diverter Flex Joint

Flow Line

CSO Diverter

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W.L.

C

A

B

A

STRUCTURE/RISER CONTACT

BINDING CONTACT, RESULTING IN RISER DAMAGE AND

MAKE-UP DIFFICULTIES DUE TO ANGLE.

RISER OVERSTRESS.

A

B

C

D

FOAM MODULE DAMAGE.

DIVERTER HOUSINGREGION

D

D

D

CURRENTS

D

Current induced loads can cause the Riser to bind as it is run through the Rotary Table and Diverter Housing.

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MUDLINE

WAVE HEAVE

AMPLIFIEDRISER RESPONSE

W.L.

LOADHOOK

DYNAMIC LOAD ON LIFTING GEAR

RATED LIFTING GEAR CAPACITY

NET WEIGHT OF RISER ON

TIME

LIFTING GEAR

HOOK LOAD INDICATOR

Rig lifting equipment must be able to deploy the Riser with the LMRP/BOP Package without exceeding design capacity.

Lifting Equipment

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TENSIONER STROKE

RISER HEAVE ISSOFT HANGOFF,

MINIMIZED BYRISER HEAVES WITH

LMRP

VESSEL

HARD HANGOFF,

W.L.

Stay attached duringstorm conditions

Disconnect the riser and pull out of the hole

Hang-off – Hard or Soft

Storm Hang-off of Riser

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VIV Excitation Due to Currents Vortex shedding due to steady current acting on a pipe results in pipe dynamic motions and fatigue.

⇒ Steady ⇒ Current ⇒ ⇒

Riser Pipe Current-induced Vortices

Wave LoadsEnvironmental Conditions

Riser Fatigue Considerations

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G R E E N

Y E L L O W A L E R T

R E D A L E R T

D IS C O N N E C T C I R C L E

D E G R A D IN G S T A T U S

P R E P F O R E D S

E D S T IM E (A P P R O X .6 0 S E C O N D S )

G R E E N - N O R M A L O P E R A T IO N S

D IS C O N N E C T C IR C L E - E D S C O M P L E T E D , R IS E R

R E D A L E R T - E D S IN IT IA T E D

Y E L L O W A L E R T - P R E P A R E F O R E D S

D IS C O N N E C T E D

V E S S E L O F F S E TF R O M W E L L C E N T E R

Drift-Off/Drive-Off

• Disconnect Speed• Control System

• Riser Tension Recoil• Control of Disconnect

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WAVE ACTION

CURRENTS

MUDLINE

ANGLE

ANGLEMOTIONSVESSEL

W.L.

Limits for Connected Riser Operations

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MUDLINE

ANGLE

ANGLE

OFFSETVESSEL

W.L.

B

D

C

A

RISER

TENSIONERS/TELESCOPIC JOINT

FLEX JOINT

LMRP/BOP

WELLHEAD & CONNECTORSE

CONDUCTOR PIPEF

AC

C

B

D

E

F

POSSIBLE WEAKPOINTS

To prevent failure of Riser/Well System Components, Emergency Disconnect must be completed before vessel offset causes the Riser/Well System to exceed allowable limits.

Riser, Wellheadand Conductor

Strength

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System ObjectiveProvide a system level solution for drilling in ultra deepwater drilling:

BOP FlangeWellhead ConnectorSubsea Wellhead SystemConductor Sizing(Analysis)Conductor/Casing

Connectors

15,000 psi to 20,000 psirated pressure7,000,000 ft.-lbs. Bending @ 15,000 psi

F

~6.6 MM ft-lbs

~7 MM ft-lbs

~7.7 MM ft-lbs

~14 MM ft-lbs(40' Below Mudline)

~8.4 MM ft-lbs

θ

BOP Flange

WellheadConnector

WellheadSystem

Conductor/CasingConnectors

System Considerations

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MUDLINE

LMRP

BOP

W.L.

LMRP MUST MAINTAINCLEARANCE ABOVE BOPSTACK

MUST MAINTAIN CLEARANCEIN TELESCOPIC JOINT

NO SLACK INWIRE ROPES

BOP

LMRP

After riser disconnect, the LMRP must be lifted to prevent contact with the BOP stack during vessel down heave.

Riser RecoilResponse

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2004 MUDLINE

BOP

SEAWATERPRESSURE

PRESSUREMUD

W.L.

Minimal pressure device

Contingency plan for bubble in riser

Riser Burst Pressure

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Gas in Riser vs Choke/Kill Line

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MUDLINE

FROM RISERMUD RELEASE

LMRP

BOP

PRESSURESEAWATER

EMPTYRISER

W.L.

During an emergency disconnect, external pressure from seawater can collapse the Riser if the mud column drops too fast.

Riser Collapse/Riser Fill-Up Valve Placement

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As vessel heading is changed, excessive torque can be applied to the connected drilling riser.

Torque Loads due toHeading Change

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Wellhead with a rigid lockdown mechanism to

enhance fatigue life.

Control Panel

Release Piston Indicator

Power Piston Indicator

Latch to 36”

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Riser Monitoring Systems and Inspection Methods

Daily:Mud weightEnvironmental conditions changeRiser tension and rig location

Long Term:CorrosionCracksWear and DamageChoke and Kill lines

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Benefits from CompositesGeneral

Increased fatigue lifeElimination of corrosion problems

Composite Choke and Kill LinesProvides a 60% weight savings over equivalent steel linesCan save about 25-30% of the total riser string weight, thus extending an existing rig’s drilling depth accordingly

Composite Drilling Riser SystemProvides a 65% weight savings over steel riser systemsCan increase the drilling depth of an existing rig or platformSignificantly reduces the variable deck weight

Composite Production RiserProvides a 60-80% weight savings over equivalent steel risersCan eliminate the need for tensioners on TLPs and SPARsCan increase the number of wells for a given vessel

smaller space requirementsless deck weight

Can increase the water depth for a given production system.

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VGI Composite Products

Harnessing incredibly strong carbon fiber and durable epoxy matrix to produce light-weight oilfield products

Composite products are providing solutions to today’s challenges

Composites enable use of existing rig fleets and production platform designs to go deeper --safer and less expensively.

Choke & Kill LinesDrilling RisersProduction Risers

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$8.4 Million Savings

5,000’ Rig Upgrade to 10,000’

Baseline 5,000’ Water Depth Capable RigAll Steel Riser System (C&K, booster, hydraulic)Nominal 2,000 Kip Tension with 15 ppg Mud46” Diameter BuoyancyDeck Weight of 2.3 M lbsDay Rate of $30k

10,000’ Composite Riser UpgradeSystem Deck Weight 3.55 M lbs5,000’ of Steel Riser Body $2.0 M10,000’ of ALL Aux. Lines $11.7 MAdded 3,000’ of Buoyancy $1.5 M Total $15.2 M

10,000’ Steel Riser UpgradeSystem Deck Weight 5.8 M lbs5,000’ of Full Riser $5.3 M7,200’ of 56” Buoyancy $6.1 M Total $11.4 M

Savings in Upgrades on Rig12 Months of Docked (50%) $5.5 M60” Rotary Table Upgrade $1.5 MRig Buoyancy Upgrade ($2.36/lb) $5.2 M Total $12.2 M

OR

+

Composite System Steel System