Semi-sealed device of four-ram blowout preventer of coiled tubing and method

Abstract

The invention relates to a semi-sealed device of a four-ram blowout preventer of a coiled tubing and a method. According to the technical scheme, an expandable semi-sealed rubber cylinder is installedat the center of a blowout preventer body, the self-locking end of the tail portion is fixed to the blowout preventer body through a rubber opening pressing ring, and a circular annular cavity is formed; and a semi-sealed expansion control block is fixed to the outer side of the blowout preventer body, an oil inlet buffer groove and an oil outlet buffer groove are formed in the inner side of theblowout preventer body, and the oil inlet buffer groove corresponds to the expandable semi-sealed rubber cylinder of the blowout preventer body. The semi-sealed device of the four-ram blowout preventer of the coiled tubing and the method have the beneficial effects that the expandable semi-sealed rubber cylinder is of an integral structure, the expandable semi-sealed rubber cylinder is fixed in aspecial-shaped cavity of the blowout preventer body through the rubber opening pressing ring, during use, the expandable semi-sealed rubber cylinder can be self-locked on the blowout preventer body bypressing, the other side expands to seal the outer wall of the coiled tubing in a contacted mode, mutual balance of the pressure of internal and external of gas or liquid is achieved, leakage is notprone to occurring, using 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 four-ram blowout preventer for coiled tubing, in particular to a half-sealing device and method for a four-ram blowout preventer for coiled tubing. Background technique [0002] In the construction process of the 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 semi-sealing is the most important safety protection during the construction process. Device, the existing half-sealing device, with reference to the Chinese Patent Document Publication No. 201915889U, the patent name is the half-sealing device mentioned in "Hydraulic Control Four Ram Blowout Preventer": a pair of half-sealing rams are symmetrical through two piston rods It is fixed on the front end of the two semi-sealing pistons, which are respectively located in the two semi-sealing liquid cylinders. When in use, when the oil pipe passes through the blowout p...

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

Images