Rapid replacing device for wellhead blowout preventer

Abstract

The invention relates to the technical field of oil-gas drilling, well cementation, well completion or pipeline connection, in particular to a rapid replacing device for a wellhead blowout preventer.Grooves for containing cam blocks are formed in the inner side face of a locking ring at intervals, the cam blocks are rotatably arranged on a body pipe, the outer side face of the locking ring comprises a cam bearing surface and a cam locking surface, the cam bearing surface is a protruding curved surface generated by a certain straight section rotating along the rotating center of the cam blocks, and the cam locking surface is a plane. A sliding-in end is located between the cam bearing surface and the cam locking surface in smooth transition. When the cam locking surface is parallel to theaxis of the body pipe, the distance between the cam locking surface and the axis of the body pipe is larger than the radius of a locking-ring locking surface to enable the cam locking surface and thelocking-ring locking surface to be in interference fit, the cam bearing surface extends outwards from top to bottom in the diameter direction of the body pipe, only one hydraulic device is required for driving the locking ring, the structure is simpler, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, well cementing, well completion or pipeline connection, in particular to a quick replacement device for a blowout preventer at the wellhead. Background technique [0002] Existing device is the U.S. patent of a patent No. US10030461B2, as figure 1 , the cam lock 220 can be opened remotely. First, by remote hydraulic actuation, the camlock piston 222 is pushed to extend, causing the camlock to rotate. The rotation of the cam lock moves the cam lock to the engaged position, so that the contact surface 225 of the cam lock is pressed against a boss 254 connected to the interface pipe 250 of the BOP. Then through the remote hydraulic drive, the piston of the lock ring 240 is retracted, and the lock ring 240 moves down to block the cam lock. The lock ring primarily acts as a safety device to prevent the cam lock from accidentally disengaging in the event of a loss of hydraulic pressure....

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a quick replacement device for wellhead blowout preventer, which only needs one hydraulic drive system, in order to solve the problem that the current blowout preventer pipeline connection device needs two hydraulic drive systems, which cause expensive equipment and cumbersome drive The connection lock of the pipeline can be realized

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