17.0 Concept - SureSEAL Rigless Well Abandonment

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XLTL.COM 2006 ALL RIGHTS RESERVED

8th September 2006

DEA(E) MILAN

For

Feasibility StudySureSEAL - Rigless well abandonment

WWW.XLTL.COM WWW.XLTL.COM All rights reserved 2006All rights reserved 2006

22/20/20 Commercial in Confidence Commercial in Confidence

SURESEAL Rigless Well

Abandonment

Rigless well abandonment process using a down hole electric pump deployed on an umbilical

No Rig No casing removal from well All zones tested Guaranteed annular cemented seal (for all casings)

Summary

Duration Total cost

12 months k60




Abandonment

Isolates all zones and casing annuli with 100% permanent seal

Eliminate disposal of tubulars

Efficiently remove wellhead and other hardware to required depth below the mudline

Operable from a DSV or 'vessel of opportunity with wireline and pumping capabilities

Significantly reduce abandonment costs

Objective


Abandonment



1. Once connected to the wellhead and tested does not require disconnection regardless of the number of times the equipment needs to be recovered to the surface vessel

2. Plug retrieval barrel (could allow wellhead plugs to retrieved and stored at the wellhead) Saves time and vessel cost.

Well Intervention


Abandonment



3. Lubricator and BOPs remain connected to wellhead at all times.

4. Tools are run on umbilical and located into lubricator using funnel guide. High pressure umbilical seal conveyed with the assembly from surface vessel and located in funnel section

Well Intervention


Abandonment



7

Packer

Reservoir fluids

Residual mud

Brine kill fluid

9.5/8

13.3/8

20

30

Production tubing

Well Arrangement


Abandonment



1. Fire first set of guns to create equalisation ports at surface

Process


Abandonment



2. Continue to TD

3. Set NRV in talpipe

4. Fire 2nd set of guns to access liner lap

5. Fire 3rd set of guns to access tubing annulus

Process


Abandonment



6. Use electric pump to displace tubing and tubing annulus contents into reservoir

Process


Abandonment



7. Once contents displaced pump cement slurry into reservoir to seal.

8. Finally displace slurry into annulus.

9. Flush with water and WOC

10. Pressure test

Process


Abandonment



11. Place cement plug on top of NRV

12. Displace with water

13. WOC

14. Pressure test

Process


Abandonment



15. Come back to surface and fit new guns.

16. Perforate 9.5/8casing at or near surface

Process


Abandonment



17. RIH to suitable depth and perforate 9.5/8casing

Process


Abandonment



18. Let 9.5/8 annulus drain into sump

Process


Abandonment



19. Displace cement into tubing and 9.5/8 annulii

20. Flush with water

21. WOC

22. Pressure test

23. Repeat with other annuli as required

Process


Abandonment



Result of first generation SureSEAL process performed on a land well.

Results from process performed on UK land well

Results of Process


Abandonment



Well head abrasive jet cutting tool deployed to sever all casing and allow the recovery of the wellhead.

Full logging capability

Wellhead Removal


Abandonment



Cuts on multi casing assemblies

Well and all exposed annuli 100% sealed and all hardware removed from at least 10ft below the mud line

.

Wellhead Removal


Abandonment



All annuli 100% sealed for a category 3 well without the need for a rig.

Each seal can be independently tested.

No casing and minimum fluid removed from the well.

All hardware removed from at least 10ft below the mud line.

Key Points


Abandonment



1. Detailed process evaluation2. Vessel requirements3. Down hole hardware 5. Hazops and Hazids7. If viable phase 2 planning and costing

Total project cost

10,000 10,000 20,000 15,000 5,000

60,000

Feasibility Study Budget

Documents

17.0 Concept - SureSEAL Rigless Well Abandonment