A hydraulic double-layer pipe double-gradient downhole blowout preventer valve

Abstract

The invention relates to a hydraulic double-tube double-gradient downhole blowout preventer valve. The downhole blowout preventer valve is mainly composed of an upper joint and a lower joint, an intermediate casing installed between the upper and lower joints, and an intermediate casing installed on the middle casing. The extrusion plate, the upper valve seat, the lower valve seat, the ball valve driving device installed between the upper and lower valve seats, the overflow pipe installed on the ball valve driving device, and the rubber tube installed on the lower joint. The double-layer pipe inner pipe plugging structure is mainly composed of upper and lower valve seats, ball valves, and ball valve driving devices. The ball valve driving device is composed of a driving sliding sleeve and an eccentric pin. The beneficial effect of the present invention is that it can realize the controllable and simultaneous plugging of the annulus channel of the inner and outer tubes of the double-layer pipe and the channel of the inner tube when a kick or blowout occurs at the bottom of the well; the plugging effect is stable, and the plugging effect is not affected by the well. Bottom pressure fluctuations can ensure the safety of double-layer pipe dual-gradient pressure-controlled drilling; after the well killing is completed and well kick and blowout are under control, the blowout preventer valve can be reopened to ensure normal drilling.

Description

A hydraulic double-tube double-gradient downhole blowout preventer technical field The present invention relates to the technical field of double-layer pipe double-gradient managed pressure drilling, be specifically related to a kind of hydraulic type double-layer pipe double ladder Downhole blowout preventer. Background technique [0002] Marine gas hydrate is regarded as the main alternative energy in the future because of its high energy density and huge reserves. It is a hot spot in the world's energy development. There are abundant oil and gas and natural gas hydrate resources in the South my country Sea, most of which are It is stored in the deep water sea area, and drilling in this sea area needs to face the narrow pressure window of deep water drilling operation, leakage-prone production layers, and seabed. The problems of safe drilling of loose surface layers and low leakage pressure of shallow hydrate layers in the seabed are difficult. It is expected to so...

AI Technical Summary

Problems solved by technology

It solves the problem of manually opening or replacing parts after the traditional downhole blowout preventer is closed, and achieves the purpose of reusability

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