Coal-seam gas dual-channel well-washing valve

Abstract

The invention relates to a coal-seam gas dual-channel well-washing valve, and is applied to the technical field of coal-seam gas exploitation. Two external threads of different nominal diameters are arranged at the upper end of an adapter; an internal conical surface is arranged at the upper end of the center hole of the adapter, and a steel ball is arranged on the conical surface; a core barrel is connected with the upper end of the adapter; a lateral liquid inflow hole is formed on the wall of the core barrel; a liquid discharge pipe is connected with the upper end of the core barrel; an outer barrel is connected with the upper end of the adapter; circular space is formed between the inner wall of the outer barrel and the outer wall of the core barrel; a pipe joint is connected with the upper end of the outer barrel; and circular space is formed between the pipe joint and the liquid discharge pipe. The coal-seam gas dual-channel well-washing valve has the effects that a hydraulic pump truck is connected with a sleeve gate of a gas exploitation well mouth, so as to pump clean water into a well casing; well-washing water can achieve the underground blocked pump barrel and oil pipe through conversion of the water flow channels of the coal-seam gas dual-channel well-washing valve, so as to wash the underground coal dust to the ground; the well-washing water does not enter the coal seam, so as not to damage the coal seam; and production can be directly restored, and the coal-seam gas yield is rapidly restored to the yield before the pump barrel blockage caused by coal dust.

Description

technical field [0001] The invention relates to the technical field of coal-bed methane exploitation, in particular to a coal-bed methane double-channel well flushing valve in the process of coal-bed methane exploitation. Background technique [0002] Coalbed methane belongs to unconventional natural gas, commonly known as gas, and its main component is methane (CH 4 ), which is generated during coal formation and exists in the coal seam and surrounding rocks in a free or adsorbed state. [0003] In the development of coalbed methane, the liquid drainage well plays a key role in the process of drainage and pressure reduction for gas recovery. Drainage equipment commonly used in drainage wells mainly include: tube pumps, screw pumps and electric submersible pumps. Tube pumps are the most commonly used in these liquid drainage and gas recovery methods. The surface pumping unit drives the plunger in the tube pump barrel to reciprocate up and down through the sucker rod in th...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a double-channel well flushing valve for coalbed methane, which solves the problem that the pulverized coal blocks the pump barrel or oil pipe and other drainage channels and has to perform pump inspection operations; when the coal powder blocks the pump barrel or oil pipe, there is no need to The way to check the pump is to remove the pulverized coal that blocks the pump barrel or oil pipe

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