6. Impact of well intervention – mature asset 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Oil Sm 3 / D No activity Drill New Maintenance
7. Addressing challenges – realising opportunities Milling or high pressure jetting to remove scale Straddles or patches to repair tubing Wellbore cleanout, fill removal with long or reverse circulation Selective zonal isolation, mechanical or chemical Heavy duty fishing with simultaneous removal of fill Wellbore unloading with nitrogen Formation matrix or fracture stimulation Milling and underreaming to remove wellbore scale Perforating long sections Scale build-up in the upper completion Equipment problems SCSSV Access problems Restricted production Water influx Wellbore scaling Access problems Restricted production Formation damage (scale, fines, etc.) Restricted production “ Fishes” Access problems Restricted production Water holdup Wellbore sanding Access problems Restricted production Completion integrity issues
8. Category A RLWI Category B Full range intervention & TTD Category C Drilling and completion • Wireline / tractor only • Limited bha length • Full range of through tubing services • Limited live well through tubing services High pressure light weight riser (8 - 5/8 ” ) Low pressure marine riser (21 ” ) standard HP concentric riser and SSTT required for live well intervention
9. Cat B – fit for purpose concept Lightweight HP riser system (through tubing) Full DP or mooring assisted station keeping options Topside system sized for through tubing operations (2⅞” & 3 ½” drillpipe) Integrated high capacity coiled tubing package (2 ⅞” / 3 ½”) Full handling of live well returns Semi-submersible rig hull type
10. LRP/EDP stack on BOP carrier SBOP In rack-back area Key components in riser system
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13. Protecting Horizontal XT (HXT) – used on all pipe runs - Classification: Internal 2010-04-12 HORIZONTAL XMAS TREE PIGGY BACK WEAR SLEEVE TUBING HANGER NIPPLE PROTECTOR
14. Through Tubing Drilling (TTD) drilling through existing tubing (completion) Existing production tubing Production packer Whipstock Through Tubing Sidetrack Production from ’motherbore and new sidetrack simultaneously Reservoir SSD CHOKE
16. P-4 AH Actual Drilled Wellpath – Geological Cross Section Not Ile 2 & 3 Ror Tilje 3 TVDMSL Tilje 1 & 2 Tilje 4, 5, 6 Ile 1 Garn 3 & 4 Garn 1 & 2 T1 T2 T3 T4 T5 Kick off 3871mMD Garn 3 P-4 H mother bore P-4 AH actual Drilled a world record of 1744m 5 ¾” TTRD sidetrack
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19. Subsea well intervention; Learning from the past – planning for the future Trond Inge Ramsnes Project Leader Well Intervention trira@statoil.com, tel: +47 51 99 00 00 www.statoil.com Thank you