A double channel direction control short circuit device

Abstract

The invention discloses a double-flow-channel direction control short connection device. The device is connected to the lower ends of an inner-layer pipe and an outer-layer pipe of a double-layer pipe. The device comprises an outer-layer flow channel one-way valve, a fluid steering short connector and an inner-layer flow channel one-way valve, wherein the outer-layer flow channel one-way valve comprises a valve core A, an outer-layer sealing ring A, an inner-layer sealing ring A and a spring A, and can be used for realizing direction control of fluid in an outer-layer flow channel; the fluid steering short connector can be used for realizing communication of an inner-layer flow channel with an annulus space; the inner-layer flow channel one-way valve comprises a valve core C, a valve seat C, a valve body C and a spring C, and can be used for realizing direction control of fluid in an inner-layer flow channel. By adopting the device, fluid entering the annulus space through the outer-layer flow channel can be guided into the inner-layer flow channel, and isolation of the inner-layer flow channel and the outer-layer flow channel from the shaft bottom fluid can be realized. The device has the advantages of simple structure, reliability in direction control and reduction of shaft bottom pressure fluctuation during pump opening.

Description

technical field [0001] The invention relates to a fluid direction control shorting device, in particular to a shorting device for controlling the fluid direction in a double flow channel of a double-layer pipe. Background technique [0002] With the continuous advancement of oil drilling technology, double-layer drill pipe low-pressure drilling technology, central sampling drilling technology and rewell drilling technology have gradually appeared. These technologies are all based on double-layer pipe (double-layer drill pipe) equipment. An inner layer flow channel is formed inside the inner layer tube of the double-layer tube, and an outer layer flow channel is formed between the inner layer tube and the outer layer tube. During the drilling process, especially when using double-tube-based rellwell drilling technology for circular drilling, it is required that the drilling fluid on the ground can pass through the outer flow channel and the drill bit water hole to reach the b...

AI Technical Summary

Problems solved by technology

In the patent US20100276143A1, a directional control shorting device used in downhole double-layer pipes is mentioned. This shorting device adopts a ball valve structure. The opening and closing of the ball valve is realized by the ball valve rotation mechanism. The structure is relatively complicated. Changes in fluid displacement may cause the ball valve to be half-opened and half-closed, resulting in wear of the ball valve spool and affecting the reliability of the seal

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