Rigless Cutting the Cost of Well Abandonments

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1 SPE 4th European Well Abandonment Seminar Rigless Cutting the Cost of Well Abandonments Date: Thursday 18th April 2013 Richard Innes, Decommissioning Engineer

2 Objective What Does Rigless Mean Basic Requirements Case Study Comparisons Conclusions

3 Objective Permanently Abandon the well safely (in compliance with O&GUK guidelines)

4 What Does Rigless Mean

5 Rigless? Do you need to pay for this?

6 Rigless? When you can just use this?

7 Only mobilise what you need Where possible use existing structure/deck Use existing well tubulars for conveying barriers (cement) Create a tailored spread suitable for platform and job Tubular removal, use Jacks, cut into sections to meet crane capacity

8 Basic Requirements

9 Suitable wells 400+ sq m of available deck space (load capacity?) 10+ tonne crane Crew changing (helideck or walk to work) Standby vessel Flushed liquid disposal Multi-well campaign

10 Phases I. Preparation II. Place barriers III. Remove tree and top of tubing IV. a) Cut conductor and casings b) Remove steel to 10 below sea bed

11 Phase II, Typical Suitable well 0 Seabed 1000 Triassic SSSV nipple Upr Bunter shale Bunter Sand 4000 Lwr Bunter Shale 5000 Zechstein Leman gas Packer Production Zone Legend Anhydrite Claystone Dolomite Halite Limestone Sandstone Shale

12 Phase II, Placing barriers 1 0 Seabed 1000 Triassic SSSV nipple Upr Bunter shale Bunter Sand 4000 Lwr Bunter Shale 5000 Zechstein INSTALL BRIDGE PLUG Leman gas Packer Production Zone Legend Anhydrite Claystone Dolomite Halite Limestone Sandstone Shale

13 Phase II, Placing barriers 2 0 Seabed 1000 Triassic SSSV nipple Upr Bunter shale Bunter Sand Lwr Bunter Shale Zechstein PERFORATE TUBING, CIRCULATE & FLUSH CLEAN Leman gas Packer Production Zone Legend Anhydrite Claystone Dolomite Halite Limestone Sandstone Shale

14 Phase II, Placing barriers 3 0 Seabed 1000 Triassic SSSV nipple Upr Bunter shale Bunter Sand Lwr Bunter Shale Zechstein Leman gas Packer Production Zone Plug no 1 PUMP BALANCED CEMENT PLUG (800 FT) Legend Anhydrite Claystone Dolomite Halite Limestone Sandstone Shale

15 Phase II, Placing barriers 4 0 Seabed SSSV nipple 1000 Triassic 2000 Upr Bunter shale 3000 Bunter Sand PERFORATE THROUGH TO B- ANNULUS, CIRCUALATE & FLUSH TO CLEAN UP 4000 Lwr Bunter Shale Zechstein Leman gas Packer Production Zone Plug no 1 Legend Anhydrite Claystone Dolomite Halite Limestone Sandstone Shale

16 Phase II, Placing barriers 5 0 Seabed 1000 Triassic SSSV nipple 2000 PUMP BALANCED CEMENT PLUG (500 FT) 3000 Upr Bunter shale Bunter Sand Plug no Lwr Bunter Shale Zechstein Leman gas Packer Production Zone Plug no 1 Legend Anhydrite Claystone Dolomite Halite Limestone Sandstone Shale

17 Phase III, Remove tree and top of tubing REMOVE TREE AND 250 FT TUBING 0 Seabed 1000 Triassic SSSV nipple Upr Bunter shale Bunter Sand Plug no Lwr Bunter Shale Zechstein Leman gas Packer Production Zone Plug no 1 Legend Anhydrite Claystone Dolomite Halite Limestone Sandstone Shale

18 Phase IV, Cut & recover casings and conductor CUT & RECOVER CASING STRINGS AND CONDUCTOR 10 FT BELOW MUD LINE 0 Seabed 1000 Triassic SSSV nipple Upr Bunter shale Bunter Sand Plug no Lwr Bunter Shale Zechstein Leman gas Packer Production Zone Plug no 1 Legend Anhydrite Claystone Dolomite Halite Limestone Sandstone Shale

19 Case Study Leman Field Well Abandonments 2013 & 2004

20 Leman Field, 27C Platform 27C Drilling Production - Drilling

21 Phase II Place Barriers 2013

22 Cementing Spread

23 Top deck working area

24 Case Study Phase III Tree and Tubing Removal (2004)

25 Tree and wellhead

26 Wellhead and tubing removal

27 Case Study Phase IV Conductor and Casing Cutting and Removal (2004)

28 Conductor cutting and removal Abrasive cutting spread 27A platform Spreader beams

29 Conductor removal

30 Comparisons

31 Platform Well Abandonments SNS Time per well Days Cut & recover conductor Place cement barriers Suspend and Remove tree 0.00 Rig Lift barge Platform rigless

32 Platform Well Abandonments SNS Cost per well 3000 Cost per well k Rig SNS Benchmark Platform Rigless

33 Conclusions

34 Conclusions A rig is not necessarily required for complete and safe abandonment Existing structures already in place can be used Significant cost savings have been demonstrated Multi-well campaigns - share mobilisation - efficient equipment utilisation - team building/learning Benefits in doing some wells while field infrastructure is still available

35 Thank You

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