Coiled tubing blowout preventer

Abstract

The invention relates to a coiled tubing blowout preventing box, which comprises a pipe joint connected with a blowout preventer for testing a wellhead, wherein the upper part of the inside of the pipe joint is connected with the lower part of a sealing sleeve in a sealing way, and a sealing hydraulic cylinder is arranged above the sealing sleeve, and comprises an outer cylinder liner; a piston rod is slidably sleeved by the outer cylinder liner from bottom to top in a sealing way, and an upper oil hole is formed in the top of the outer cylinder liner; a lower oil hole is formed in the bottom of the outer cylinder liner, and the free end of the piston rod can be slidably arranged inside the sealing sleeve in a sealing and penetrating way; the bottom of the side wall of the piston rod constitutes a swing part which is circumferentially arranged in a sectioning way and is capable of opening and closing radially, and a rubber core which is circumferentially arranged in a sectioning way and can be furled to form a cylinder structure is arranged on the inner wall of the swing part; and the inner wall of the rubber core can prop against the side wall of the coiled tubing in a sealing way. The coiled tubing blowout preventing box solves the problems of complex structure and complicated rubber core replacement and the like in the prior art, and has the advantages of simple structure, convenience in maintenance and replacement of the rubber core, and good sealing performance.

Description

technical field [0001] The invention relates to a wellhead sealing device for coiled tubing operations, in particular to a coiled tubing blowout prevention box. Background technique [0002] When an oil field enters the later stage of development, there will often be a problem of reduced production. Generally, sidetracking from old wells can be used to recover the remaining oil. The coiled tubing underbalanced drilling technology can not only quickly sidetrack slim holes, but also effectively protect the reservoir, thereby improving the development efficiency of mature oilfields. When performing coiled tubing underbalanced drilling operations, a wellhead sealing device, the blowout preventer, is needed. Its function is similar to that of the rotary blowout preventer used in conventional drill pipe underbalanced drilling, but there are differences. [0003] The blowout preventer is a well control device located between the injection head and the blowout preventer group. The ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a coiled tubing blowout preventer, which overcomes the problems of complex structure and cumbersome rubber core replacement in the prior art. The coiled tubing blowout preventer has a simple structure, convenient maintenance and update of the rubber core, and good sealing performance

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