well intervention; Learning from the past – planning for the future

UTC 2010 Trond Inge Ramsnes

1 - Classification: Internal 2010-09-06 Beautiful but demanding

2 - Classification: Internal 2010-09-06 Optimising reservoir recovery from subsea fields

• Increased fluid handling capacity • Reduced pressure • • Identify −Drainage points Ambition: −Well intervention increase subsea needs and Cost effective drainage & well recovery opportunities intervention

3 - Classification: Internal 2010-09-06 4 Cumulative wells – Statoil NCS

700 Dry trees 600

500 Wet trees

400

300

200

100

0 1980 1990 2000 2010

4 - Classification: Internal 2010-09-06 5 Learning from the past – planning for the future 2013 Cat B 2009 2004 TT riser 2003 TTML 2002 RLWI 2000 TT Drill 2⅞”CT

• Safe & efficient operations • Maintain • Full technical • TTRD platforms motherbore capability and subsea • Platforms only to production including MPD date • CTD (Gullfaks) • Access by- • Cost efficient • Solid base for • Spoolable passed • TTRD delivery of through connectors • Data collection reserves • CTD tubing technology • Sweep cleanouts • Light perforating • Gullfaks, • CT/WL • Backup to RLWI

• Light mechanical Veslefrikk intervention wireline

5 - Classification: Internal 2010-09-06 6 Impact of well intervention – mature asset

18000

16000

14000

12000

Oil 10000 Sm3 8000 /D 6000

4000

2000

0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

No activity Drill New Maintenance

6 - Classification: Internal 2010-09-06 Addressing challenges – realising opportunities

Scale build-up in the upper completion Wellbore scaling Milling or high pressure Milling and underreaming to Equipment problems SCSSV Access problems jetting to remove scale remove wellbore scale Access problems Restricted production CompletionStraddles or integrity patches to Restricted production issuesrepair tubing

Wellbore sanding Wellbore cleanout, fill Formation damage (scale, Formation matrix or fracture removalAccess problems with long or reverse fines, etc.) Wellbore unloading stimulation Water holdup circulation with nitrogen Restricted production Restricted production

Perforating long sections

“Fishes” Heavy duty fishing Accesswith simultaneous problems removal of fill Restricted production

WaterSelective influx zonal isolation, mechanical or chemical

7 - Classification: Internal 2010-09-06 Category A Category B Category C RLWI Full range intervention & TTD Drilling and completion

High pressure Low pressure light weight marine riser riser (8-5/8”) (21”) standard HP concentric riser and SSTT required for live well intervention

•Wireline / •Full range of •Limited live tractor only through well through •Limited bha tubing tubing length services services

8 - Classification: Internal 2010-09-06 Cat B – fit for purpose concept Topside system sized for Integrated high capacity coiled through tubing operations tubing package (2 ⅞”/ 3½”) (2⅞” & 3½” drillpipe)

Semi-submersible rig hull type Full handling of live well returns

Full DP or mooring Lightweight HP riser assisted station system (through tubing) keeping options

9 - Classification: Internal 2010-09-06 Key components in riser system

LRP/EDP stack on BOP carrier SBOP In rack-back area

10 - Classification: Internal 2010-09-06 Operational Limitations

•WSOG •Position reference •Propulsion •Riser system limitations •Wellhead limitations •Drift-off / drive-off •”Zero Moment Position” •RMS system used as advisory system for rig positioning 9Fatigue monitoring / management

11 - Classification: Internal 2010-09-06 Experience with TT Riser System

• Pilot operation with new system offshore

− new equipment and procedures • stepwise and constrained progress.

• Improve cleaning after milling and drilling operations.

• No wear of the high pressure riser detected

• RMS − High focus – used actively − Relatively nice weather – low utilization

− High angles in Upper Flex Joint

12 - Classification: Internal 2010-09-06 Protecting Horizontal XT (HXT) – used on all pipe runs

TUBING HANGER NIPPLE PROTECTO PIGGY BACK R HORIZONTAL WEAR SLEEVE XMAS TREE

13 - Classification: Internal 2010-09-062010-04-12 Through Tubing Drilling (TTD) drilling through existing tubing (completion) Existing production tubing Production from Production packer ’motherbore and SSD new sidetrack simultaneously Through Tubing Sidetrack Whipstock

CHOKE Reservoir

14 - Classification: Internal 2010-09-06 15 Operational experience Åsgard P-4

Increasing target count & reserves

Decreasing target volume

Additional reserves Cat B enabled

< 300 < 100 < 50 kSm3 kSm3 kSm3

15 - Classification: Internal 2010-09-06 P-4 AH Actual Drilled Wellpath – Geological Cross Section

Kick off TVDMSL 3871mMD P-4 H mother bore Garn 3 Garn 3 & 4 P-4 AH actual Garn 1 & 2

Not

Ile 2 & 3

Ile 1

Ror

Tilje 4, 5, 6

Tilje 3

Tilje 1 & 2 T1 T2 T3 T4 T5

Drilled a world record of 1744m 5 ¾” TTRD sidetrack

16 - Classification: Internal 2010-09-06 Production P-4

Initial production approx. 20 000 boe/d

17 - Classification: Internal 2010-09-06 Status Category B Services

• 3 Contractors carrying out FEED (Front End Engineering and Design) in the period March - September 2010; − Aker Oilfield Services − Helix WellOps − • Bid process ongoing – bid due mid October • An 8 years “Cat B Services Contract” will be awarded this year − Operations commencement Q3 2013

18 - Classification: Internal 2010-09-06 Thank you

Subsea well intervention; Learning from the past – planning for the future

Trond Inge Ramsnes Project Leader Well Intervention [email protected], tel: +47 51 99 00 00 www.statoil.com

19 - Classification: Internal 2010-09-06