Q SERV SCALE SQUEEZE SERVICES

BAKER PETROLITE / SHELL EXPRO

PLATFORM : TERN ALPHA

WELLS TA 02,03,04,05,06,11,12,13,15,16,17s1&s2,21,24,30,Kestrel U-P1&P2 SQUEEZE OPERATIONS

April/May 2008

QSJ 7630

Compiled by: Ed Pattinson

Introduction

The following report has been drafted to provide Shell Expro with a clear and concise record of Scale Squeeze Operations during Qserv’s campaign onboard the Tern Alpha Platform.

Scale squeeze treatments were carried out successfully without any accidents or incidents, and no equipment failures / downtime on Wells. TA WELLS TA 02,03,04,05,06,11,12,13,15,16,17s1&s2,21,24,30,Kestrel U-P1&P2

Qserv, have very much welcomed and enjoyed the opportunity to undertake such services-operations for your organization and to that end, we would welcome any opportunities to undertake further operations.

Please review the document and relay any queries or comments to ourselves.Or Contact Steve Burgess @ Qserv on 01224-783707 or steve.burgess@qserv.com.

Objective

The object of the campaign was to carry out Scale Squeeze treatments on WELLS TA 02,03,04,05,06,11,12,13,15,16,17s1&s2,21,24,30,Kestrel U-P1&P2 as per Baker Petrolite programs, whilst at the same time providing a Chemist Service during the pumping operations and well flow back periods.

Equipment

Description Asset Number Date Arrived

Date Off

60 Series engine skid Qserv 10424 08/04/08 22/05/0860 Series fluid end skid Qserv 10076B 08/04/08 22/05/08Iron. Container Qserv 10838 08/04/08 22/05/08Centrifugal Pump skid Qserv 10520 08/04/08 22/05/08200 bbl Tank Qserv 10640 08/04/08 22/05/08Half Height HH20012 08/04/0835 bbl tank TS011 08/04/08 22/05/08Chemical injection pump Qserv 680 08/04/08 22/05/08Chemical injection pump Qserv 685 08/04/08 22/05/08Wilden pump Qserv GY645C 08/04/08 22/05/08Wilden pump Qserv GY646C 08/04/08 22/05/08Chart Recorder Qserv CR028 08/04/08 22/05/08Mini cargo basket Qserv 10646 22/05/08Mini cargo basket Qserv 1064320ft Half Height GB 418 22/05/08

Personnel

Name Date Out Date ReturnedKevin Ritchie 04/04/08 21/04/08Edward Pattinson 04/04/08 14/04/08Steve Lonie 09/04/08 23/04/08Simon Underwood 09/04/08 23/04/08James Munro 09/04/08 28/04/08Dean Davidson 09/04/08 21/04/08Malcolm Maitland 14/04/08 28/04/08Edward Pattinson 21/04/08 08/05/08Gordon Campbell 21/04/08 01/05/08Martin Allen 23/04/08 01/05/08Graham Richardson 23/04/08 08/05/08Dean Davidson 28/04/08 09/05/08Kevin Ritchie 28/04/08 15/05/08Steve Lonie 01/05/08 15/05/08Simon Underwood 01/05/08 19/05/08Malcolm Maitland 08/05/08 21/05/08James Munro 08/05/08 21/05/08Stuart Oliphant 09/05/08 21/05/08Edward Pattinson 15/05/08 23/05/08Gordon Campbell 15/05/08 21/05/08Graham Richardson 19/05/08 23/05/08

Summary

4 th April

2 x supervisors arrived on the Tern, create permits for rigging up and down equipment and for all the treatment wells and get scaffolding erected on the wells TA 02 & TA 26 Water Injection for rigging up on to. Requested scaffold around hatch on west skid deck.

5 th April

Continue to make up permits and attend permit meeting, wait on equipment to come of the boat when it arrives at the Tern and get it spotted. Remaining crew members bumped until 9th April due to adverse weather conditions.

6 th April

Continue to make up permits and attend permit meeting.

7 th April

Liaise with STL and deck crew regarding equipment spotting on west skid deck.Attend permit meeting.

8 th April

Boat arrived with equipment, stand-by to spot equipment and check inventory of equipment.

9 th April

4 x pumping operators arrived on board; Start spotting all equipment on the west skid deck. Check inventory of equipment.

10 th April Started rigging up pump and high pressure lines for TA 02 squeeze waiting on prod techs to do WIT tests on the well before we can rig up onto it. Scaffold erected around hatch on west skid deck. Request chemical tanks for TA05,TA06,TA11 to arrive TERN 14/04/08

11 th April

Rig on to TA02, pressure tested all lines and commenced TA02 S/SQ as per program @ 12:57 THP 20.5 bar. Change out Chemical tanks from TA02 to TA03, TA04 and transfer to holding tank. Backload TA02 chemical tanks and Qserv half height HH20-012 for storage. Request scaffold around TA03 to allow rigging on to Kill Wing.

12 th April Completed S/SQ on TA 02 @ 05:30, THP 0.0 bar.Rigged off kill wing and isolate TA26 Water injection,Started flow back on TA 02 @ 12:45 hrs. Continue to sample every 1 hr for 24hrs. Start sampling @ 15:30. Scaffold erected around TA03. Wait on next well TA03. Request scaffold for TA04 to allow rigging on to Kill Wing.

13 th April

TA03 closed in @ 03:00 hrs THP @2.6 bar. Rigged on to TA03 and pressure tested pumping line. Commenced TA03 S/SQ @ 08:50. TA03 well in vacuum @ 09:03. Completed TA03 S/SQ as per program @ 11:15 and began 6hr soak period. Completed TA02 flow back samples @ 15:30. Request scaffold for TA05 to allow rigging on to Kill Wing. Started Flow back samples from TA03 @ 21:00. Request chemical tanks for TA12,TA13,TA15 to arrive TERN 17/04/08

14 th April

TA04 shut in @ 03:00 THP 11BAR, rigged on to kill wing and pressure tested line. Suspend permit for DFT. Edward Pattinson changed out with Malcolm Maitland.Commenced TA04 S/SQ as per program @ 12:55 and completed @ 17:00 and started 6 hr soak period. Completed TA03 flow back samples @ 21:00. Scaffold in place for TA05. Requested scaffold for TA06. Waiting for chemical tanks for TA05, TA06, and TA11. TA04 began flowback @ 23:30.

15 th April

Started flowback samples @ 02:00 forTA04.Chemicals on board for TA05,TA06,TA11Transfer to 200bbl holding tank. Requested isolations forTA05 & closed in @10:00 THP 12bar. Rigged on to TA05 kill wing and completed S/SQ as per program. Manifested TA03 flow back samples to Shell lab. Begin TA05 6hr soak period.Scaffold in place for TA06. Scaffold requested for TA11.

16th April

Finished flow back samples @ 0200 for TA04. Manifested TA04 flow back samples back to Shell lab TA05 opened to test separator for 24hr flow back @ 05:00 THP 46 BAR. Tubing volume returned from TA05 @ 07:00 started 24hr flow back sampling.Request chemical tanks for TA16, TA17 and TA21 to arrive TERN Sunday 20/04/08.TA06 shut in @ 15:00 THP 8.6 BAR, Rigged on to TA06 kill wing and commenced S/SQ as per program.

17th April

Finished s/sq on TA06 @ 02:22.Request isolations, rigged off TA06 Kill Wing.TA05 flow back sampling completed @ 07:00 and manifested back to shell lab. TA06 soak period extended due to test separator being utilized by production. Platform shut down all day due to integrity problems with main oil export line. Chemicals on board for TA12, TA13, & TA15. TA12 chemicals tanks x 5 transferred to 200bbl holding tank. Scaffold requested for TA12 and erected. Rigged on to TA11 Kill Wing and pressure tested. Wait on production to get plant up and running.

18 th April

Standby to flow TA06 through test separator, delay due to platform starting up process plant. Remaining chemical tanks for TA12 spotted at skid deck. TA05 flow back samples have been manifested to Shell lab

19thApril

Still on stand-by, waiting on platform to start process..20thApril

Chemical tanks for TA16, TA17 & TA21 on board. TA06 opened up to test @ 14:00 CITHP 36.7 bar- FWHP 5.4 bar.TA06 tripped at 1800hrs only one cube flowed back. Opened up to test again @ 20:30 CITHP 52 bar—FWTHP 9.6 bar. Bottoms up returned @ 23:59 Start 24hr flow back sampling.

21st April

Continue to sample TA06. Started S/SQ on TA11 @ 10:30 THP 50 bar. Ed Pattinson, Gordon Campbell & Alison Macleod came on @ 10:25 & Kevin Ritchie & Dean Davidson went off.Transfered remaining tanks for TA12 into 200bbl tank. Spotted tanks for TA13 & TA15 Completed TA06 sampling @ 23:59.Finished S/SQ on TA11 @ 19:07.Requested scaffolding around TA13

22 nd April

Rigged onto TA12 and Pressure tested surface lines. Started flow back on TA11At 05:30 THP 76 Bar. Scaffolding erected around TA13.Waiting to get bottoms up so we can start F/B sampling TA11. 18:00 Tubing volume flown back but test separatorHas tripped. Start flow back samples on TA11 at 21:30

23 rd April

Start scale squeeze onTA12 at 02:35 Finished S/SQ on TA12 17:05 soak for 6 hours transfered chemicals for TA15 & TA16 into 200 bbl tank @ 17:00 Continue to sample TA11 until 21:30 .S,Lonie & S,Underwood went off and M,Allen & G, Richardson came on. Rigged off TA 12 and commenced flow back at 23:00hrs.Finished F/B sampling on TA11 @ 21:30

24th April

Started 24 hr sampling on TA 12 at 02:00hrs after initial tubing volume had been flown back .Continue sampling TA12.Rigged onto TA13 @1500 wait on permit for pressure testing. Got permit, pressure test lines for TA13 suspend permits for DFT @1717.Started squeeze on TA13 at 20:20.

25th April

Completed scale squeeze on TA13 at 00:30.Competed sampling from TA12 at 02:00. TA13 currently on 6hr soak period No-one on nights to issue permits in the early hours of the morning for rigging off TA13.08:00 rig off TA13 start flowing back tubing volume. Got tanks TA17 in place. Start flow back sampling for TA13 @ 11:00. Continued sampling TA13 through out the night and early Morning. Could not get isolation on TA15.

26 th April

Competed sampling from TA13 @ 11:00 Squeeze programme slowed down so platform can get their water & production sorted as squeeze chemicals are causing problems. Rigged onto TA15 @16:30. Pressure tested and performed scale squeezeOn TA15

27 th April

TA15 pumping complete at 04:45 shut in well for 6hr soak. Rigged off TA15 @ 08:15 Job complete permit @ 09:25.Tanks for TA17 in place. Scaffolding erected around TA17. Job on hold due to test separator pump failure.

28 th April

M, Maitland & J, Munro crew changed out today and K, Ritchie & D, Davidson onboard.We will start sampling from the well skid as the test separator pump is out of action. On standby for sampling TA15 & continuing with squeeze programme. Redressed choke and carried out integrity test. Chemical tanks for TA24 on board.

29 th April

Started Flow Back sampling TA15 @ 00:00 from sample skid. Requested scaffold for TA17 + TA21. Changed out TA16 WAW85202 for TA17 WAW85202 due to treatment well sequence change.

30 th April

Completed TA15 flow back sampling @ 00:00, awaiting permit and isolation to commence TA17 @ 04:00 can’t sustain isolation UHMV passing. Rigged on to TA17 kill wing @16:30 & pressure tested surface lines, CITHP 77bar. Start scale squeeze@ 21:15

01 st May

During Overflush on TA17 upper hydraulic Master valve shut in at aprox 02:40Causing PRV to discharge. Valve was reset and continued overflush. TA17 S/SQ complete @ 06:24 and begin 6hr soak period, rigged off kill wing @ 09:45. TA17 flow back started @ 13:50. CITHP 60.8 bar. TA17 shut in again due to plant BS&W levels. Martin Allan & Gordon Campbell departed location; Steve Lonie & Simon Underwood arrive on board. Transferred TA21 chemicals into front of 200bbl tank, changed out TA17 WAW with TA21 WAW & changed out TA21 empty tanks for TA30 full tanks. All empty chemical tanks manifested for backload. Chemical tanks for TA30 on board

02 nd May

Stand by and await conformation to flow back TA17. After conference call with Baker Petrolite & production supervisor it has been decided to proceed with a revised program for TA21. The WAW85202 has been omitted and the main treatment SCW82361 (2273 ltrs-14.3bbls) extended as per revised program (si TA21s1.04.r2).

03 rd May

Stand by and await conformation to flow back TA17 or Commence TA21 S/SQ.

04 th May

TA21 shut in @ 14:00 CITHP 55BAR, Rigged on to TA21 kill wing & pressure tested.Transferred Chemical from TA16 for TA21 main treatment volume adjustment as per program (si TA21s1.04.r2). Started scale squeeze on TA21 @ 20:50

05 th May

Completed S/SQ on TA21 as per program, soak for 6 hrs. Rigged off kill wing & started flow back @16:00 CITHP 1.7 BAR. Requested scaffold for TA30 access to kill wing & erected. Prepared equipment for TA30. Transferred chemicals for TA30 into front of 200BBL tank. Started flow back sampling on TA21 @ 20:00

06 th May

Continue sampling TA21 until 10:00, only gas being returned. Manifested TA30 empty chemical tanks for backload. Water injection shut down due to leakage @ 20:00 Stand by and await repair.

07 th May

After discussion with all relevant parties it has been decided to proceed with original S/SQ programs. Stand by and await isolations on TA30 techs busy getting plant back up and running. Chemical tanks WAW85202 & SCW82361 for Kestrel U-P1 & U-P2 now onboard

08 th May

Edward Pattinson & Graham Richardson crew changed out today with Malcolm Maitland & James Munro arriving onboard. Standby for TA30 S/SQ.

09 th May TA 30 shut in @01:00hrs with CITHP @ 24.9 bar. Stand by for isolations on TA30.Rigged on to kill wing and pressure tested to 3500psi. Water injection down from midday to 16:00. Commenced TA30 S/SQ @ 16:20 as per program. Water injection shut down again @ 18:00. Dean Davidson crew changed out for Stuart Oliphant.

10 th May

Got water injection going again, Started pumping again @ 02:26 on TA30. Completed TA30 S/SQ as per program @ 13:35. Changed out TA30 chemical tanks with TA24 chemical tanks & started transferring into 200bbl holding tank. Request Kestrel U-P1 & U-P2 chemical MEG tanks to arrive Tern Alpha 16/05/08. Rigged off TA30 @ 21:00, On standby to sample TA17 &TA30.

11 th May

TA30 opened up @ 13:20 CITHP -1.7 BAR but unable to gain flow. Production exhausting all options. Requesting scaffold for TA24 & TA16 as this was utilized on another well. Tried sampling @ 21:30 but too much gas, Tried again TA30 still to gaseous. Platform closed in TA30 to try & build up pressure.

12 th May

Standby to sample TA30. TA17 opened up @ 08:57, CITHP 79 BAR, FWHP 10.5 BAR, TA17 hydrocarbon returns @ 13:10, only hydrocarbons being returned @ 18:00. Keep trying to get samples every hour up until 21:00 when N.Barr informed us to stop sampling on TA17,& only try every so often until shift change.

13 th May

TA16 shut in @ 11:15 CITHP 65BAR, rigged on to TA16 and commenced Scale Squeeze @ 14:50. Transferred remaining TA24 SCW82361 tanks in to 200BBL tank.Manifested all remaining empty chemical tanks for backload. Stopped attempting to obtain flow back samples from TA17 @ 09:00.

14 th May

Finished S/SQ on TA16 @ 04:40, Soak for 6 hours. Rigged off and job completed TA16 permit. Assisted production techs with TA26 WIT. Changed out TA24 empty SCW82361 tanks with Kestrel U-P1 SCW82361 tanks. TA16 begin flow back @ 13:50 and started flow back sampling @ 14:00 CITHP-20BAR, FWHP- 7.9BAR. TA16 tripped @ 14:40, TA16 begin flow back again @ 16:40. Scaffold for access toTA24 kill wing now in position.

15 th May

Continued to sample TA16.Plant tripped @ 04:25.Now leaving TA16 shut in until after 12 hr shut down. Crew change Ed Pattinson & Gordon Campbell on Kev Ritchie,Steve Lonie off. Rig onto TA24 & pressure test.

16th May

Commenced with S/SQ program on TA24 @ 01:45 ,CITHP 35 Bar. Commenced bunkering diesel into 200bbl displacement tank. Attended permit meeting for KestrelPermit. Water Injection shut down @ 17:00hrs.200bbl tank now full of diesel @22:05.

17 th May

Water injection now up & running commenced with S/SQ on TA24 @ 00:40. Commenced flow back on TA30 @ 03:15 THP 5.3Bar and started sampling @ 07:00.TA24 completed @ 08:28.Now in 6hr soak. Started sampling TA24 @ 16:30.Rigged onto Kestrel tie in point and pressure tested @16:40

18 th May

Completed sampling TA30 & TA24. Commenced Kestrel diesel flow line displacement

19 th May

Filled 200bbl tank with diesel & continued with Kestrel flow line displacement.Started treatment on Kestrel @ 09:45.Stop pumping as CCR have not configarated the valves properly. Need to pump an extra 509bbls to get main treatment down well. Start pumping again @ 19:50 after TOFS in the CCR. Simon Underwood crew changed out today for Simon Underwood.

20th May

Started S/SQ Kestrel P2 as per program instructions. Finished squeeze operations on Kestrel .Start to rig down Job complete permit for TA26.

21 st May

Job complete permits for hot work & Kestrel. Continue rig down M. Maitland, J, Munro G, Campbell & S, Oliphant getting down manned .Continue rig down. Start flowingKestrel @ 18:00 and commenced sampling @23:00

22 nd May

Continue sampling and prepare to down man

23 rd May

Completed sampling, Ed Pattinson and Graham Richardson down man job complete.