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PL 204 BOWEN BASIN

SPRING GULLY COAL SEAM GAS DEVELOPMENT HYDRAULIC FRACTURE

STIMULATION PROGRAM SPRING GULLY 28

DistributionC White /P Lansom /M Pitkin /T Scholefield /J Rodda/ Erhart Stockhausen /Charles Stewart (E copy) Origin Energy Wellsite Representative (E Copy) Spring Gully Operations Superintendent (E copy) Wellsite (3)Halliburton (E copy) Vause (E copy) DNRM (E copy)

Origin Energy CSG Limited Ground Floor,

South TowerJohn Oxley Centre 339

Coronation DriveMILTON QLD 4064

A.B.N. 68 001 646 331

Sept 2006

Version 1.0

CONTENTS

Page

1. GENERAL INFORMATION............................................................41.1. Well Summary 4

2. PROJECT...................................................................................52.1. Description 52.2. Wellsite Control 52.3. AFE Cost Codes 62.4. Compliance Documents 6

3. OPERATIONS.............................................................................73.1. General 73.2. Key Activities 83.3. Tasks 9

4. TECHNICAL DATA....................................................................134.1. Equipment List 134.2. Consumable Items 134.3. Frac Sand & Chemical Requirements 144.4. Perforating Considerations 154.5. Perforation Intervals & Baffle Depths 154.6. Pumping Schedule 164.7. Displacement Tables 174.8. Frac Valve Removal 184.9. Frac Baffle Information Sheet 21

5. SCHEMATICS...........................................................................225.1. Frac Spread Layout 225.2. Wellhead Sketch for Pumping 235.3. Wellhead Diagram (Post Frac) 245.4. Well Location Diagram 25

6. SITE SPECIFIC INDUCTION FORM..............................................26

ORIGIN ENERGY CSG LIMITED - DRILLINGSpring Gully 28 Frac Program SG28 Frac

Page 4 of 29Issued: Sept 2006Date Printed: 2-

1.GENERAL INFORMATION1.1. Well Summary



2.PROJECT2.1. Description

This document outlines the processes for management and the technical outline for the work required to fracture stimulate Spring Gully 28. Halliburton and Vause will be used to perform the work.

The aim of the fracturing jobs is to remove skin damage caused by cement and mud invasion during the drilling and casing process. To bypass the formation damage, a small water and sand fracture stimulation will be placed into each coal seam.

2.2. Wellsite Control

Control of work sites is to be formally handed over between Service Groups in the following manner.

STAGE FROM TO DOCUMENT ATTACHMENT

Pre-Perforating

Spring Gully

Construction

Manager

Origin Energy Wellsite

Representative

Well handover form

– oil/CSG well

Site specific issues

Post Frac and demobilisation

Origin Energy Wellsite

Representative

Spring Gully

Construction Manager

Well handover form

– oil/CSG well

Punch List if required

The Wellsite Representative should liaise with the Operations Superintendent Spring Gully to ensure there is full awareness by both parties of the planned activities at all times. The Wellsite Representative will report to the Completions Superintendent or delegate on a minimum daily basis during the course of the work program.



2.3. AFE Cost Codes

WELL NAME: ACCOUNT CODESpring Gully 28 – Fracture

Stimulation701 - 0052 - 52xxx -

702

Note: The 702 Sub-code trails all stimulation specific costs.

Purchase Orders must be issued by Brisbane Office to all Contractors except Halliburton and Vause.

2.4. Compliance Documents

This program is directly linked to and must be read in conjunction with the Wellsite Safety Management Plan (SMP). The Wellsite SMP includes a list of Regulatory Documents, Safety Standards and Operating Procedures (Appendix 5) which, in addition to the documents referenced below, are the governing documents for this program of work. These documents must be accessible in electronic or hard copy form to all personnel at the wellsite.

Document Title Supplied by

Halliburton Stimulation Operations Safety Manuals Halliburton

Vause Logging & Perforating Operations Safety Manuals Vause

Material Safety Data Sheets Halliburton

Material Safety Data Sheets Vause

Halliburton TPSA 27-10-2005, OE Ref# OUEP1428 Origin

Wireline Logging & Perforating Services Agreement (2006-2007 CSGCampaign) – Vause Wireline

Origin



3.OPERATIONSALL PERSONNEL ONSITE HAVE THE AUTHORITY TO STOP ANY

ACTIVITY THEY BELIEVE TO HAVE AN UNACCEPTABLE LEVEL OF RISK

3.1. General1. The tasks listed in this program form a guide for the anticipated fracture stimulation activities and may need to be modified as the work progresses. Minor changes to the program may be made at the discretion of wellsite personnel in consultation with the Wellsite Representative and the Completions Superintendent. A Drilling Change Control Record approved by the Brisbane Office will be required when:• An equipment or well design change has an impact on safety• There is a material change to what is documented in this program• The cost impact of the change is greater than $20,000.

2. All personnel participating in the project must receive a Site Specific Induction from the OECSG Wellsite Representative prior to commencement of activities on the site and be outfitted with appropriate PPE. Non-essential personnel and casual visitors should be discouraged from entering the wellsite. Any visitors to the wellsite must receive the Site Specific Induction or a Visitors Induction.3. Toolbox Meetings (TBM) or Job Safety Analysis (JSA) meetings must be conducted prior to any new or critical operation and any change or variation in the procedure.4. No equipment is to be moved onto location until Weed Hygiene Declaration forms have been received and approved by the Operations Superintendent responsible for the area. The Origin Wellsite Representative will liaise with the Operations Superintendent prior to the equipment mobilising to the wellsite and arrange a handover to discuss local issues that may impact on the project.

IN ALL EMERGENCY SITUATIONS THE PROTECTION OF PERSONNEL IS PARAMOUNT. NO ATTEMPT SHOULD BE MADE TO ENTER A DESIGNATED EMERGENCY AREA.



3.2. Key Activities

PRE-FRAC: INSTALL CASING NIPPLE AND 7-1/16” FRAC VALVE.

MIRU VAUSE WIRELINE. PERFORATE LOWER COAL SEAMS.

MIRU FRAC SPREAD

CONDUCT WATER FRAC #1

PERFORATE FRAC #2 COAL INTERVAL(S)

DROP BALL #1


PERFORATE FRAC #3 COAL INTERVAL(S)

DROP BALL #2


PERFORATE FRAC #4 COAL INTERVAL (S)

DROP BALL #3


RDMO ALL EQUIPMENT TO NEXT WELL

REMOVE FRAC VALVE AND INSTALL B-SECTION



3.3. Tasks

3.3.1.General Notes:

a) Confirm with Roma FSG that the landholder has been notified of the intended well activity prior to moving the rig and equipment onto location.

b) The frac spread shall not be moved onto location until the Origin Energy Wellsite Representative is present and (a) has been confirmed.

c) Safety meetings must be held at the appropriate times throughout the following task list, including field inductions upon arrival. All safety meetings, JSA and TBM shall be documented in the daily report.

d) Fluids are not to be discharged onto the well site, except to an approved pit.

e) The well site is to be cleaned up and restored as soon as is practicable.

f) When the spread has moved off location and the lease cleared of all equipment and rubbish, the OE Wellsite Representative will hand the well back to the Spring Gully Construction Manager or his nominee using the “Handover/Handback – Oil/CSG Well” form.

g) The cased hole logs (CBL-VDL-GR-CCL) have already been performed on 4th Aug 2006.

3.3.2.Specific Notes:

a) When rigging up the injection and primer lines, ensure that the primer line back to the frac pond is not connected to the top of the 6 way frac head. The primer line must be installed on one of the side outlets of the frac head to ensure that the well may be flowed back to the pit if required.

b) The installed 7” BTC x 7-1/16” 5K nipple and the 7-1/16” 5000 psi frac valve have not been pressure tested after installation. The 7” BTC x 7-1/16” 5K nipple should be new or tested (thickness & crack) prior to use on each campaign. The handover note to Origin Energy Completion Supervisor, or Spring Gully Construction Manager should clearly indicate that the casing nipples are to be returned to Origin Energy Roma once removed from the well at campaign end for inspection &



testing prior to re-use on subsequent fracture stimulation campaigns.



c) A safety meeting will be conducted daily and a toolbox meeting prior to any new operations. JSA’s and work permits should be completed for any operations required that are not part of the usual fracture stimulation program operations.

d) Baffle depths are from the CBL-VDL-GR-CCL log.

e) Exact flush volumes and decline times will be determined by the Origin Energy Site Frac Engineer.

f) The OE Wellsite Representative is to ensure the frac pond is fit for purpose before the arrival of the frac spread.

1. Prior to mobilising the Frac spread, arrange for the installation of the following on top of the casing stub: 0.5 m long 7” BTC N-80 23 ppf x 7-1/16” 5K R-46 casing nipple and 7-1/16” 5000psi frac valve. Refer to the included Wellhead Sketch for Pumping.

2. MIRU Vause logging unit and crane. Ensure all current emitting devices on site are turned off and perforating safety/danger signs are posted at lease entry point. Use the CBL-VDL- GR-CCL dated on 4th Aug 06 log to confirm perforation depth.

3. Open frac valve. RIH and perforate Frac #1 coal seams as per the attached Perforation Interval table. Pull out of hole. Close the frac valve.

4. MIRU Halliburton water frac spread. Mix Bacteria kill into frac pond and roll chemical into pond with blender unit. R/U on-the-fly dosage pumps for Bactericide and pH control chemicals.

5. Complete relevant work permits and conduct pre-job safety meeting with all personal on site prior to commencing fracture stimulations.

6. Pressure test surface lines to 5000 psi against the closed frac valve. Repair any leaks as necessary. Set PRV to 5,100psi and set electronic kick outs on the pumping units between 4800 psi and 4900psi.

7. Pump Frac #1 as per the included Pumping Schedule. Stop pumping and monitor decline until the Origin Energy Site Frac Engineer gives the OK to stop. Close the frac valve and bleed off pressure in the injection lines.



8. Ensure all current emitting devices on site are turned off. R/D top treating line and R/U perforation equipment. Open Frac valve and RIH with gun #2 and CCL tool, tag and record



sand fill, correlate and perforate Frac #2 coal seams as per the attached Perforation Interval table.

Note: If the final displacement wasn’t sufficient and sand is tagged above the baffle; POOH perforation gun #2, R/U a bean choke and attempt to flow the well back to the pit. Once cleaned up, repeat the above step. Once the perforations are completed, close the frac valve.

9. Bleed down pressure from lubricator and treating lines, then R/D perforating equipment and drop Ball #1. RDMO perforating contractor while Frac #2 is being pumped.



12. Ensure all current emitting devices on site are turned off. R/D top treating line and R/U perforation equipment. Open Frac valve and RIH with gun #2 and CCL tool, tag and record sand fill, correlate and perforate Frac #3 coal seams as per the attached Perforation Interval table.


13. Bleed down pressure from lubricator and treating lines, then R/D perforating equipment and drop Ball #2. RDMO perforating contractor while Frac #3 is being pumped.


15. Pump Frac #3 as per the included Pumping Schedule. Stop pumping and monitor



decline until the Origin Energy Site Frac Engineer gives the OK to stop. Close the frac valve and bleed off pressure in the injection lines.



16. Ensure all current emitting devices on site are turned off. R/D top treating line and R/U perforation equipment. Open Frac valve and RIH with gun #4 and CCL tool, tag and record sand fill, correlate and perforate Frac #4 coal seams as per the attached Perforation Interval table.


17. Bleed down pressure from lubricator and treating lines, then R/D perforating equipment and drop Ball #3. RDMO perforating contractor while Frac #4 is being pumped. The perforating contractor can mobilise to the next lease and begin to rig up for the next perforation runs.



20. R/D all pipe work from the frac valve up. If there is a requirement to remove the frac valve prior to demobilising Halliburton for the next well, see section 4.8 for instructions.

21. Bleed off well pressure. If surface well pressure bleeds to zero remove the frac head, frac valve and casing nipple together by unthreading the casing nipple at the 7” BTC connection. These 3 components can then be mobilised to the next well for immediate rig up.

If the surface well pressure does not bleed to zero remove the frac head and request an additional frac valve and casing nipple from the SG lay down yard for rig up on the next well.

In the event the frac valve needs to be removed independently of the frac head see Section 4.8 for instructions.



22. RDMO Halliburton to the next lease.



4.TECHNICAL DATA4.1. Equipment List

Item Description Quantity Source1 Frac Van & Laboratory 1 Halliburton

2 Grizzly 2000 HP pump trailer 2 Halliburton

3 V12 H/P pump trailer 1 Halliburton

4 V16 H/P pump trailer 1 Halliburton

5 Iron trailer 1 Halliburton

6 Forklift and fuel tank trailer 1 Halliburton

7 Slurry Processor (blender) 1 Halliburton

8 HP Transducers, HP Densiometer, leads to Frac Van. 1 set Halliburton

9 Mobile Mechanics workshop 1 Halliburton

10 Frac manifold & associated pipework 1 Halliburton

11 Frac head and assorted surface iron 1 Halliburton

12 Toyota Land Cruiser 2 Halliburton

13 Mitsubishi Canter Trucks 1 Halliburton

14 Forklift 1 Halliburton

15 Prime Movers 4 Halliburton

16 Chemical Trailer 1 Halliburton

17 Smoko Trailer 1 Halliburton

18 7-1/16” 5000 psi full bore frac valves 1 OE Roma

19 7” 23# BTC N80 x 7-1/16” 5k Casing Nipple 1 OE Roma

20 7” BTC Wellhead w/ 3-1/2” EUE Hanger & Bull Plug 1/well OE Roma

21 Wireline Truck / Unit 1 Vause

22 Setting Tool f/ 7” BP 1 Vause

23 Crane 1 OE Roma /Roma Cranes

4.2. Consumable ItemsItem Description Source

1

2

3

16/30 Frac Sand (in 1200kg bags)

CAT-1 Bacteria Kill

FE-1A – pH Control

Halliburton

Halliburton

Halliburton

4 7” OWEN Econo Bridge Plug OE Roma

5 Frac Balls OE Durham

6 Perforating Guns Vause



4.3. Frac Sand & Chemical RequirementsAdditive concentrations for the fluid formulations listed below are estimates only. Actual concentration to be determined based on pilot tests of frac fluids on location or in Roma. The pH buffer will be added on the fly. The bacteriacide will be added to the pond initially and depending on requirements, may also be added on the fly.

4.3.1.Chemical Treatment Schedule

Chemical

PurposeConcentration(per 1000 gal)

Cat-1 Bacteriacide

0.5 gal/1000gal

Fe-1 pH buffer 0.5 gal/1000gal

4.3.2.Required Sand and Chemical quantities.

The total chemical and sand volumes required based on the above fluid formulation and the design frac pumping schedules including excess will be as follows:

Chemical

Purpose Conc/1000gal

Estimated Vol. totreat. gals (bbls)

VolumeRequired

Cat-1 Bacteriacide

0.5 gal 252,000 (6,000) 126 gals

Fe-1 PH buffer 0.5 gal 224,700 (5,350) 112.5 gals

Product Purpose

1200kg bags required

Equivalent lbs of Frac Sand

16/30 frac sand

Proppant

45 bags 118,000 lbs



4.4. Perforating Considerations

a) Rig up BOPs and lubricator with crane.

Note: 3-3/8” Guns cannot be run through baffles with an ID of 3.625” or smaller.

Advise all on-site personnel to shutdown electrical equipment and maintain radio silence while perforating.

b) Note: Full bore 5,000 psi frac valve to be installed prior to any perforating for all wells.

c) Make up and arm HSC guns and RIH to perforate the intervals for the zone being fracture stimulated next.

d) Correlate to CBL-VDL-GR-CCL log dated 4th Aug 2006. Perforate coal seam intervals then POOH.

e) Rig aside lubricator and BOPs with crane and layout guns. Check if all shots were fired and report.

4.5. Perforation Intervals & Baffle Depths



4.6. Pumping Schedule



4.7. Displacement Tables



4.8. Frac Valve RemovalOften there are more wells to be fraced then available frac valves. If there isn’t a workover rig available to move onto a fraced well and remove the valve, the following procedure is to be followed.

4.8.1.Equipment Required

Crane or Hiab truck. A long reach crane would be more suitable then a Hiab truck due to the possibility of the well flowing.

2 x 2-3/16” Hammer spanners. Chain Tong to suit 7” casing. 7” BTC, 3K#, wellhead for final well completion. Inclusive of:

o 3-1/2” EUE tubing hanger fitted with 3-1/2” EUE bull plugo Fitted annulus valves for complete well isolation.

Short landing joint, 3-1/2” EUE. For helping to install tubing hanger in to casing bowl.

Either of the following;o Halliburton 5-way frac head still fitted to the well c/w lifting cap, oro Lifting sub to remove frac valve. 7-1/16” flange with a 2.5m length of 7”

LTC on top. Lifting lugs with chain and swivel attached for lifting and nippling up.

3-1/8” flange lifting sub with eyelet for lifting wellhead. Lifting chains and a swivel will be required if the Crane or Hiab doesn’t have a

swivel on the hook. 3 x 20m ropes for stabilisation of the lifting sub and frac valve once removed. Gas Detector.



4.8.2.Preparation Work Prior to Frac Valve Removal

The Wellhead needs to be prepared prior to being fitted to the well. The following will need to be completed:

The tubing hanger needs to be removed and the 3-1/2” EUE bull plug fitted to the underside of the hanger. The plug needs to be done up tight as the workover BOP’s will be pressure tested against it. The tubing hanger then needs to be reinstalled into the casing bowl, the tie-downs tightened, and the bonnet flange fitted. Correct installation of tubing hanger to be verified by Wellsite Representative. Use the 3-1/2” EUE box thread looking up and start landing joint if required to land hanger.

The annulus valves need to be fitted and tightened. The valves should be left open.

4.8.3.Frac Valve Removal

1. The wellhead should be prepared & ready to install prior to commencement of frac valve removal.

2. Observe the well and ensure the well has zero WHP.

3. If the well is not at 0 psig, wait until the well has bled off to 0 psig. Due to the high permeability it is expected that the wells will leak-off to 0 psi within one hour.

4. Gather a 3 man crew (1 on the crane, 2 nippling up) and hold a tool-box meeting to run through the procedure and ensure everyone understands the response plan and knows their role.

5. Check the well again for pressure. Ensure the Hiab truck or Crane has a hot cut-out switch within easy reach in case the well begins to flow during the valve removal process. From here on in the Hiab or Crane will be simply referred to as

the ‘Crane’.

6. Attach the lifting cap to the 5-way frac head or the 7-1/16” lifting sub to the top of the 7-1/16” frac valve (ensure a soft iron ring gasket is used).

7. Open the 7-1/16” frac valve.

8. By taking a small amount of weight with the crane, unscrew the 7” LTC nipple



with frac valve still nippled up. Should the well begin to flow or kick, refer to Section 4.8.4 on page 20, Contingency Procedure.



9. Once the casing nipple and frac valve is clear, quickly install the wellhead with the tubing hanger and bull plug fitted. Ensure the annulus valves are open, this will prevent any pressure build-up while installation is in progress. Stand clear of open valves.

10.Once the wellhead is attached to the casing string and tightened, close the annulus valves. RDMO the crane from the lease.

4.8.4.Contingency Procedure

The first priority will always be the protection of personnel. No attempt should be made to protect equipment over personnel.

Case 1. If the casing nipple is still threaded and the well begins to flow, shut down and isolate the crane immediately. Tighten the casing nipple as much as possible and close the 7- 1/16” frac valve. Contact the Brisbane office and inform the Completions Superintendent. Clear the well area of all personal and wait for forward plan from Brisbane.

a. The site crew completing the frac valve removal can begin getting a cross over flange, choke, and flow back line ready to flow the well back to the frac pond.

b. Pre-emptive preparations to run an OWEN Econo bridge plug could begin also.

Case 2. If the casing pup and valve has been removed and the well flows before the wellhead can be installed, shutdown all machinery and clear the well area immediately. Immediately contact the Brisbane office and inform the Completions Superintendent. Clear the well area of all personal and wait for forward plan from Brisbane.

a. Preparation to re-install the frac valve can begin while waiting for instruction from Brisbane. The site crew completing the frac valve removal can begin getting a cross over flange, choke, and flow back line ready to flow the well back to the frac pond.

b. Pre-emptive preparations to run an OWEN Econo bridge plug could begin



also.



4.9. Frac Baffle Information Sheet

Pill Hill (50x5m) Gate(2x3m)

48m FracPond

E-Line

Manifold

100mCrane

WELL LEASE LAYOUT FOR MITCHEL RIG#141 & TDC RIG #1 & FRAC SPREAD

Flare Pit

45m115m

Drilling Sump



5.SCHEMATICS5.1. Frac Spread Layout

Slur

ry

Tip

PuPu

PuPu

Frac

Park



5.2. Wellhead Sketch for Pumping



5.3. Wellhead Diagram (Post Frac)



5.4. Well Location Diagram



6.SITE SPECIFIC INDUCTION FORM

COAL SEAM GAS– HYDRAULIC WATER FRACTURING - SITE SPECIFIC INDUCTION

Origin Wellsite Rep: Date:

Primary Contractor: Well Name: Spring Gully 28

Contractor Rep: Project Engineer: Charles Stewart

The undersigned have attended and contributed to the minutes of this meeting.

Attendee Name: Company: Signature:



Attendee Name: Company: Signature:



Project OverviewDescription:Perforate the 1st interval, water frac the 1st interval. Repeat the perforating and fracing cycle for each coal interval associated with the well. RDMO to the next well.Objectives:The aim of the work is to perform a sand propped hydraulic fracture stimulation into each coal seam.Scope of Work:Pre-Frac: Install Casing Nipple And 7-1/16” Frac valve. Perforate lower coal seam(s).MIRU Frac SpreadConduct Water Frac #1Perforate Frac #2 Coal Interval(S)Drop Ball #1Conduct Water Frac #2Perforate Frac #3 Coal Interval(S)Drop Ball #2Conduct Water Frac #3Perforate Frac #4 Coal Interval(S)Drop Ball #3Conduct Water Frac #4RDMO All Equipment to next wellRemove Frac Valve and Install B-Section



Mandatory Discussion TopicsConfirmation of Origin Wellsite Representative as the Site Emergency ControllerLocation of the Origin & Contractor Safety Management Plans, Emergency Response Plan and SHEC RulesEmergency phone numbers are listed in the Emergency Response PlanActions and authorities in well control situation is documented in Emergency Response PlanDiscussion of Permit to Work System and designated Permit AuthorityAssignment of two safe evacuation areas (muster points) to ensure area is upwind of hazardous situationAssignment of safe smoking area, butt bins required, cigarettes and lighters to stay in this areaAssignment of a dedicated Hot Work area if welding/cutting etc is requiredAll chemicals onsite must have an MSDS, discuss location of MSDS and chemical storage areaAll personnel must conduct work in a manner compliant with the requirements outlined in the inductionKeep on access roads, advise Frac Master / Origin Wellsite Rep if leaving locationAll personnel must report any safety incidents, environmental incidents, accidents or nearReview SHEC requirements (SMP, Appendix 6)In all emergency situations the protection of personnel is paramount - no attempt should be made to enter a designated emergency area.

Site Specific Topics / Current Local IssuesProgram, SOP’s, JSA’s to be followed – if necessary do a new JSA to suit the taskRoads are to be watered when the job is finished if requiredNo fluids produced throughout the work program are to be released onto the ground unless to a designated pit.All vehicles require a wash down prior to entering the Spring Gully facility, unless they remain on the sealed bitumen road between the SGGP and the Taroom-Roma road.

Activity NomineeSite Safety Manager (Origin) Wellsite RepresentativeSite Safety Manager (Halliburton) Frac MasterSite Safety Manager (Vause) Well Site Perforating EngineerPermit to Work System Wellsite Permit to Work SystemPermit Authority (Halliburton) Frac MasterPermit Authority (Vause) Well Site Perforating EngineerEmergency Response Plan OERL 2006 - Wellsite ERP for SG-

28,31,33,36,44,46,29,7 (SMP, App 8)