Multi-switch anti-leakage valve with cylindrical panel valve sealing structure

Abstract

The invention discloses a multi-time switch leakage prevention valve provided with a cylindrical panel valve sealing structure, which includes a valve body composed of a positioning joint, a locking cylinder and a lower joint. Mandrel a, mandrel a is driven by the switch tool to realize reciprocating movement; inside the valve body, there are valve plates and valve seats that cooperate with each other near the lower end. Fixed on the inner wall of the valve body, the valve seat can move back and forth along the axis of the valve body; when the anti-leakage valve is opened, the mandrel a moves down, first the valve seat is pushed down by the transmission mechanism, and when the mandrel a continues to move down and touches the valve plate Push the valve plate to rotate sideways to open the anti-leakage valve. When the anti-leakage valve is closed, the mandrel a moves up, the valve plate automatically resets under the action of the return spring, and the mandrel a continues to move up and drives the valve seat to move up and press against it through the transmission mechanism. The valve plate closes the anti-leakage valve; the contact surfaces of the valve plate and the valve seat are all cylindrical.

Description

technical field [0001] The invention relates to a safety isolation device used in oil drilling and oil field production, and belongs to the technical field of oil well equipment. Background technique [0002] At present, some of the anti-leakage valves used in the downhole environment of oil exploitation use ball valve sealing devices. For example, a Chinese utility model patent (CN201507274U) describes an anti-leakage valve that adopts a ball valve sealing structure. The core inside the valve body The shaft can drive the ball valve to open or close. There is an elastic tab (also called: elastic finger) above the mandrel. When the switch tool extends into the valve body, it cooperates with the protrusion at the end of the elastic tab to drive the mandrel to move up and down to realize the anti-leakage valve. on and off. [0003] However, the internal diameter of the ball valve sealing device is small, so more and more plate valve sealing devices are used. The valve plate i...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the object of the present invention is to provide a multi-time switch leakage prevention valve provided with a plate valve sealing structure, wherein the valve plate and the valve seat are sealed with a cylindrical surface, and the valve plate is upward relative to the valve seat. Opening can solve the problem of sand or falling objects falling on the valve body and affect the opening of the plate valve. At the same time, it can ensure that the valve body has a large internal diameter, and it can also ensure the reliability of the seal in a long-term high-pressure environment.

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