A combined annular blowout preventer for oil drilling

Abstract

The invention provides a combined annular blowout preventer for oil drilling, which relates to the technical field of oilfield exploitation equipment. The combined annular blowout preventer for oil drilling includes a lower casing, an outer connecting ring is fixedly connected to the inner side of the top of the lower casing, an inner connecting ring is fixedly connected to the inner side of the outer connecting ring through a connecting rod, and the inner connecting ring The inner side is fixedly connected with the limit tube, the top of the upper push plate is fixedly connected with the upper rubber core and both the upper push plate and the upper rubber core are slidably connected to the inner side of the anti-slip sleeve on the upper part of the limit tube, and the inner top of the lower piston and the upper piston The inner bottom end is fixedly connected with an inner telescopic tube, the outer top end of the lower piston and the outer bottom end of the upper piston are both fixedly connected with an outer telescopic tube, the bottom end of the spring is fixedly connected with a pressing block, and the middle part of the top of the fuel tank is fixedly connected with a oil pump. The anti-blowout effect of the blowout preventer is good, the anti-blowout structure is not easy to be damaged, the reliability of the blowout prevention is strong, and the heat dissipation capacity is strong.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation equipment, in particular to a combined annular blowout preventer for oil drilling. Background technique [0002] During oil testing, well workover and well completion operations, it is usually necessary to use a blowout preventer to seal the wellhead to avoid blowout accidents. The blowout preventer is simple in structure, easy to operate, and resistant to high pressure. Sealing means. [0003] During oil drilling, the annular blowout preventer can seal the annular space between the pipe string and the wellbore. However, the reliability of the blowout prevention of the current annular blowout preventer needs to be improved, and there is a hidden danger of blowout prevention failure. The heat dissipation capacity of the blowout preventer is average. Contents of the invention [0004] Aiming at the deficiencies of the prior art, the invention provides a combined annular blowout pre...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a combined annular blowout preventer for oil drilling, which solves the problems of insufficient blowout prevention reliability and weak heat dissipation ability of the blowout preventer

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