Blowout preventer for sealing wellhead

Abstract

The invention relates to the technical field of oil exploitation, and discloses a blowout preventer for sealing a wellhead. The blowout preventer comprises a blowout preventer base, symmetrical hydraulic cylinders are arranged at two ends of the blowout preventer base, one end of each hydraulic cylinder is in communication with a first channel, and the other end of each hydraulic cylinder is in communication with a second channel; a hydraulic rod is movably connected in each hydraulic cylinder in a sleeved mode; and a penetrating center pipeline is arranged in the center of the blowout preventer base. According to the blowout preventer, through the designed positioning base, the flashboard and the self-locking flashboard, after being closed, the flashboard can be lifted up under the pressure impact of blowout substances, so that the two sides of the top of the flashboard are tightly attached to the self-locking flashboard, and under the pressure impact of the blowout substances, when the positioning base has a force for opening towards the two sides, the flashboard can transmit the force to the blowout preventer base through the self-locking flashboard, therefore, the flashboard forms self-locking, the situation that the flashboard is separated due to stress is avoided, and the blowout preventer gets rid of a manual locking mode and an electric locking mode.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a blowout preventer used for sealing a wellhead. Background technique [0002] The blowout preventer is a safety sealing device used to close the wellhead and prevent blowout accidents during oil testing, workover, and completion. Its working principle is to push the rams on both sides to the center through the hydraulic mechanism. Two rams are used for closing and sealing, or the two rams are pressed against the central rotary rod, sucker rod and other pipe fittings for sealing. [0003] Most of the existing blowout preventers adopt the method of hydraulically pushing the ram to close for sealing. In this way, when the elastic rubber layer on the ram is repeatedly impacted and worn or hard friction is worn, the advance amount of the hydraulically driven ram is at this time. It remains unchanged, which will cause the gate to fail to close, and the existing blowout preve...

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the use of the existing blowout preventer proposed in the background technology, the present invention provides a blowout preventer for sealing the wellhead, which has self-locking force provided by blowout material, self-locking when the ram is lifted, and elastic The wear of the rubber layer can still be closed, the compensation protrusion squeezes the self-locking ram, the self-locking ram is always attached to the ram, and the self-locking force provided by the blowout material is transmitted to the BOP base, which solves the above-mentioned background technology. Propose the technical problems that the wear of the elastic rubber layer leads to the closure failure of the gate, the troublesome operation of the locking device, the slow speed of the locking device, and the waste of power

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