Claims
- 1. A subsea production system, comprising:
a blowout preventer stack adapted to seal and contain pressure in a well; a subsea wellhead; a safety shut-in system having a valve assembly adapted to control flow and adapted to allow tools to be lowered therethrough on tubing; and a cutting module adapted to allow tools to be lowered therethrough on tubing, the cutting module further adapted to activate to shear the tubing lowered therethrough.
- 2. The subsea production system of claim 1, wherein the valve assembly comprises at least one ball valve.
- 3. The subsea production system of claim 1, wherein the tubing is coiled tubing.
- 4. The subsea production system of claim 1, wherein the tubing is selected from wireline, slickline, and communication lines.
- 5. The subsea production system of claim 1, wherein the cutting module is located below the valve assembly.
- 6. The subsea production system of claim 1, wherein the cutting module is located above the valve assembly.
- 7. The subsea production system of claim 1, wherein the cutting module comprises opposing shear blades adapted to overlap upon activation of the cutting module.
- 8. The subsea production system of claim 7, wherein the opposing shear blades have a V-shaped cutting surface.
- 9. The subsea production system of claim 7, wherein the opposing shear blades have a curved radii cutting surface.
- 10. The subsea production system of claim 7, wherein the opposing shear blades are affixed to opposing pistons.
- 11. The subsea production system of claim 10, wherein the pistons are telescoping pistons.
- 12. The subsea production system of claim 1, wherein the cutting module is activated by fluid pressure.
- 13. The subsea production system of claim 12, wherein the fluid pressure is supplied by control lines.
- 14. The subsea production system of claim 12, wherein the fluid pressure is annular hydraulic pressure.
- 15. A safety shut-in system for a well, comprising:
a valve assembly adapted to control flow and allow tubing deployed tools to be lowered therethrough; a cutting module adapted to allow tubing deployed tools to be lowered therethrough, the cutting module having actuatable opposing shear blades adapted to sever tubing.
- 16. The safety shut-in system of claim 15, wherein the valve assembly comprises a normally closed flapper valve and a ball valve.
- 17. The safety shut-in system of claim 16, wherein the cutting module is located between the flapper valve and the ball valve.
- 18. The safety shut-in system of claim 15, wherein the opposing shear blades are actuatable by fluid pressure.
- 19. The safety shut-in system of claim 15, wherein the cutting module is located below the valve assembly.
- 20. The safety shut-in system of claim 15, wherein the cutting module is located above the valve assembly.
- 21. A cutting module adapted for severing tubing in a well, comprising;
a pair of opposing pressure activated pistons; and shear blades affixed to the pistons such that the shear blades overlap upon activation of the pistons.
- 22. The cutting module of claim 21, wherein the pistons are telescoping pistons.
- 23. The cutting module of claim 22, wherein the pistons further comprise hollow slots to accommodate the overlap of the shear blades.
- 24. The cutting module of claim 21, wherein the shear blades have a V-shaped cutting surface.
- 25. The cutting module of claim 21, wherein the shear blades have a curved radii cutting surface.
- 26. The cutting module of claim 25, wherein the curved radii matches the radius of the tubing to be severed.
- 27. The cutting module of claim 21, wherein the cutting module is located in a subsea production system.
- 28. The cutting module of claim 21, wherein the cutting module is located in a subsea test tree.
- 29. The cutting module of claim 21, wherein the cutting module is located below a ball valve provided as a safety valve.
- 30. The cutting module of claim 21, wherein the cutting module is located above a ball valve provided as a safety valve.
- 31. A method of severing coiled tubing downhole without collapsing the coiled tubing, comprising:
providing a cutting module housing pressure activated opposing shear blades adapted to sever without collapsing the coiled tubing; lowering coiled tubing therethrough the cutting module; and supplying pressure to the cutting module to activate the shear blades to sever the coiled tubing.
- 32. The method of claim 31, wherein the shear blades have V-shaped cutting surfaces.
- 33. The method of claim 31, wherein the shear blades have curved radii cutting surfaces.
- 34. A method of shutting in a well during an intervention operation deployed on coiled tubing, the well having a valve assembly and a cutting module, the method comprising:
activating the cutting module to sever the coiled tubing; raising the remaining coiled tubing to clear the valve assembly; and closing the valve assembly to shut-in the well.
- 35. A method of shutting in a vertical well during an intervention operation deployed on coiled tubing, the vertical well having a valve assembly and a cutting module, the method comprising:
activating the cutting module to sever the coiled tubing; and closing the valve assembly to shut-in the well.
Parent Case Info
[0001] This application claims the benefit of U.S. Provisional Application No. 60/341,449 filed Dec. 17, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
|
60341449 |
Dec 2001 |
US |