Coiled tubing four-gate blowout preventer

Abstract

The invention relates to a coiled tubing four-gate blowout preventer. According to the technical scheme, an expandable semi-sealed rubber cylinder is installed in the center of a blowout preventer body; the self-locking end of the tail is fixed to the blowout preventer body through a rubber opening pressing ring to form an annular cavity; a semi-sealed expansion control block is fixed to the outerside of the blowout preventer body; an oil inlet buffer groove and an oil outlet buffer groove are formed in the inner side of the blowout preventer body; and the oil inlet buffer groove correspondsto the expandable semi-sealed rubber cylinder of the blowout preventer body. The coiled tubing four-gate blowout preventer has the advantages that the expandable semi-sealed rubber cylinder is of an integral structure and is fixed into the special-shaped cavity of the blowout preventer body through the rubber opening pressing ring, in the using process, the expandable semi-sealed rubber cylinder can be self-locked to the blowout preventer body through pressing, the other side of the expandable semi-sealed rubber cylinder expands to make contact with the outer wall of a coiled tubing for sealing, the pressure of gas or liquid inside and outside the expandable semi-sealed rubber cylinder is balanced, leakage is not likely to happen, use is more reliable, and the service life of the expandable semi-sealed rubber cylinder is prolonged.

Description

technical field [0001] The invention relates to a coiled tubing four-ram blowout preventer. Background technique [0002] In the construction process of coiled tubing, the 4FZ blowout preventer, that is, the four-ram blowout preventer, is a safety protection device that must be installed. In this device, the half seal is the most important safety protection in the construction process. Device, the existing semi-sealed device, with reference to the Chinese patent document publication number 201915889U, the patent name is the semi-sealed device mentioned in "Hydraulic Control Four Ram BOP": a pair of semi-sealed rams are symmetrically connected by two piston rods It is fixed on the front ends of the two semi-sealed pistons, and the two semi-sealed pistons are respectively located in the two semi-sealed liquid cylinders, and the two semi-sealed liquid cylinders are symmetrically fixed at the lower end of the housing and located below the two suspension liquid cylinders. When i...

AI Technical Summary

Problems solved by technology

The existing problems are as follows: First, the coiled tubing will shrink in diameter during long-term back-and-forth use, that is, the diameter will shrink, and the diameter of the half-sealed ram will not change accordingly, which will cause poor sealing. Case

Second, during the construction process under pressure, the half-sealed ram will cause hard friction due to the up and down movement of the coiled tubing, causing it to fail quickly

Third, during the construction process, since the innermost side of the semi-sealed ram is provided with rubber, the rubber is used to contact the outer wall of the coiled tubing to achieve sealing, but due to human reasons during the operation, the semi-sealed ram will protrude accidentally The rubber is knocked off, causing the failure of the semi-sealed device

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