초록 ▼

An improved dual purpose blow out preventer ("BOP") that provides both deployment and wellhead pressure containment functions. The dual purpose BOP may include four sets of rams including a set of seal/slip rams that provide bi-directional sealing being a first barrier to downhole pressure. The seal

An improved dual purpose blow out preventer ("BOP") that provides both deployment and wellhead pressure containment functions. The dual purpose BOP may include four sets of rams including a set of seal/slip rams that provide bi-directional sealing being a first barrier to downhole pressure. The seal/slip rams may also grip a portion of a bottom hole assembly and create the bottom seal of an annular chamber. The BOP may include a set of seal rams that create the top seal of the annular chamber. The annular chamber may be pressurized through a port in the BOP, which may actuate a coiled tubing connector. The BOP may include a set of locate rams used to position a coiled tubing connector within the BOP stack. The BOP may also include a set of blind/shear rams that provide bi-directional sealing being a second barrier to wellhead pressure.

대표청구항 ▼

What is claimed is: 1. A deployment and pressure containment blow out preventer, the blow out preventer comprising: a longitudinal bore; a set of blind shear rams in communication with the bore, the blind shear rams having a closed position and an open position, wherein in the closed position the b

What is claimed is: 1. A deployment and pressure containment blow out preventer, the blow out preventer comprising: a longitudinal bore; a set of blind shear rams in communication with the bore, the blind shear rams having a closed position and an open position, wherein in the closed position the blind shear rams create a first barrier to wellbore pressure; a set of locate rams in communication with the bore and located beneath the blind shear rams, the set of locate rams having a closed position and an open position, wherein in the closed position the locate rams include an opening adapted to prevent a portion of a coiled tubing connector from passing the locate rams; a set of pipe rams in communication with the bore and located beneath the locate rams, the set of pipe rams having a closed position and an open position, wherein in the closed position the pipe rams are adapted to seal on a portion of a coiled tubing connector, the coiled tubing connector being connected to a bottom hole assembly; a set of pipe slip rams in communication with the bore and located beneath the pipe rams, the pipe slip rams having a closed position and an open position, wherein when in the closed position the pipe slip rams are adapted to seal on a portion of the bottom hole assembly forming an annular chamber and creating a second barrier to wellbore pressure; and a valve in communication with the annular chamber formed between the pipe rams in the closed position and the pipe slip rams in the closed position. 2. The blow out preventer of claim 1 wherein the set of pipe slip rams are adapted to seal on a portion of the bottom hole assembly having an outer diameter substantially identical to the outer diameter of coiled tubing. 3. The blow out preventer of claim 1 further comprising a first passageway located above the blind shear rams, the first passageway in communication with the longitudinal bore and a first two-way valve, wherein the first valve selectively allows pressure from above the blind shear rams into a chamber behind the blind shear rams. 4. The blow out preventer of claim 3 further comprising a second passageway located below the blind shear rams, the second passageway in communication with the longitudinal bore and a second two-way valve, wherein the second valve selectively allows pressure from below the blind shear rams into the chamber behind the blind shear rams. 5. The blow out preventer of claim 4 wherein the first two-way valve is biased to prevent pressure into the chamber behind the blind shear rams. 6. The blow out preventer of claim 5 wherein the second two-way valve is biased to allow pressure into the chamber behind the blind shear rams. 7. The blow out preventer of claim 4 further comprising a third passageway located above the pipe slip rams, the third passageway in communication with the longitudinal bore and a third two-way valve, wherein the third valve selectively allows pressure from above the pipe slip rams into the chamber behind the pipe slip rams. 8. The blow out preventer of claim 7 further comprising a fourth passageway located below the pipe slip rams, the fourth passageway in communication with the longitudinal bore and a fourth two-way valve, wherein the fourth valve selectively allows pressure from below the pipe slip rams into the chamber behind the pipe slip rams. 9. The blow out preventer of claim 8 wherein the third two-way valve is biased to prevent pressure into the chamber behind the pipe slip rams. 10. The blow out preventer of claim 9 wherein the fourth two-way valve is biased to allow pressure into the chamber behind the pipe slip rams. 11. The blow out preventer of claim 8 further comprising a fifth passageway located above the pipe rams, the fifth passageway in communication with the longitudinal bore and a fifth two-way valve, wherein the fifth valve selectively allows pressure within a chamber behind the pipe rams to equalize with pressure within the longitudinal bore. 12. The blow out preventer of claim 11 wherein the fifth two-way valve is biased to prevent the equalization of pressure in the chamber behind the pipe rams with the pressure within the longitudinal bore. 13. The blow out preventer of claim 11 wherein the first two-way valve, the second two-way valve, the third two-way valve, the fourth two-way valve, or the fifth two-way valve may be remotely actuated. 14. The blow out preventer of claim 1 wherein the locate rams further comprise a funnel shaped guide to align and centralize a coiled tubing connector. 15. The blow out preventer of claim 1 wherein the valve is a two-way valve that may be remotely actuated. 16. The blow out preventer of claim 15 wherein the annular chamber may be pressurized through the valve to actuate a coiled tubing connector. 17. A method for deploying a coiled tubing tool into a dual purpose blow out preventer, the method comprising: inserting a first coiled tubing tool module into a longitudinal bore of the dual purpose blow out preventer, the first coiled tubing tool module having a first connector positioned at the upper end of the tool module and the blowout preventer including a set of blind shear rams, a set of locate rams, a set of pipe rams, and set of pipe slip rams; moving the first coiled tubing tool module past the locate rams; closing the locate rams, the closed locate rams having an opening adapted to be larger than an upper portion of the first connector; pulling the first coiled tubing tool module up to the closed locate rams until a lower portion of the first connector is adjacent to the opening, wherein the opening is adapted to prevent the lower portion of the first connector from passing through the opening; closing the set of pipe rams on the first coiled tubing tool module; closing the set of pipe slip rams on the first coiled tubing tool module to create an annular chamber between the closed pipe rams and the closed pipe slip rams; and pumping fluid through a two way valve into the annular chamber to pressurize the annular chamber. 18. The method of claim 17 wherein pumping fluid into the annular chamber causes the release of a locking mechanism of the first connector. 19. The method of claim 18 further comprising inserting a second coiled tubing tool module into the dual purpose blow out preventer until a second connector located on the lower end of the second coiled tubing tool module engages the first connector of the first coiled tubing tool module. 20. The method of claim 19 further comprising releasing the pressure in the annular chamber, wherein the release of pressure locks the first connector with the second connector. 21. The method of claim 20 further comprising pumping fluid through the two way valve into the annular chamber to pressurize the annular chamber. 22. The method of claim 21 further comprising disconnecting the second connector from the first connector and removing the second coiled tubing module from the dual purpose blow out preventer. 23. The method of claim 17 further comprising equalizing the pressure within the dual purpose blow out preventer through a valve located between the set of blind shear rams and the set of locate rams. 24. The method of claim 17 further comprising pressure testing an apparatus connected to the above the dual purpose blow out preventer through a valve located above the set of blind shear rams. 25. The method of claim 17 further comprising allowing pressure from above the blind shear rams into a chamber behind the blind shear rams and preventing pressure from below the blind shear rams from entering into the chamber behind the blind shear rams. 26. The method of claim 17 further comprising allowing pressure from above the pipe slip rams into a chamber behind the pipe slip rams and preventing pressure from below the pipe slip rams from entering into the chamber behind the pipe slip rams. 27. The method of claim 17 further comprising equalizing the pressure below the closed pipe rams with the pressure in the longitudinal bore above the pipe rams.