Plunger-type double-passage different-direction synchronous joint control check valve for double-layer continuous oil pipe

Abstract

The invention discloses a plunger-type double-passage different-direction synchronous joint control check valve for a double-layer continuous oil pipe, which is arranged between the double-layer oil pipe pipelines. The plunger-type double-passage different-direction synchronous joint control check valve comprises a left valve body, a right valve body, an inner passage piston, an inner passage piston seat, an outer passage piston, an outer passage piston seat, a long pin, a crossing plunger, a slide block, an inner passage piston return spring, an outer passage piston return spring and a slide block return spring. According to the plunger-type double-passage different-direction synchronous joint control check valve, the parts such as the piston, the return spring, the movable slide block and the like are simultaneously and additionally installed in the inner layer and the outer layer of continuous oil pipe passages, a different-direction synchronous joint control design scheme is adopted, a double-passage different-direction joint control check valve device is formed, so that when accidents happen, the passages of the inner and the outer continuous oil pipes are effectively sealed, the return of the well liquid is prevented, and the blowout is prevented.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a plunger-type dual-channel different-direction synchronous joint-control single-flow valve for double-layer coiled tubing. Background technique [0002] When the double-layer coiled tubing is operated with tools, it will encounter problems such as damage and fracture of the double-layer coiled tubing body caused by sudden accidents. gushes out and causes a blowout accident. Therefore, it is necessary to install a dual-channel different-direction joint-control single-flow valve that can effectively seal the channels of the inner and outer layers of coiled tubing and prevent blowout when an accident occurs. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a plunger type for double-layer coiled tubing that can effectively seal the passage of the inner and outer coiled tubing when an accide...

AI Technical Summary

Problems solved by technology

[0002] When the double-layer coiled tubing is operated with tools, it will encounter problems such as damage and fracture of the double-layer coiled tubing body caused by sudden accidents. blowout accident

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