Automatic well washing device for coal-bed gas well

Abstract

The invention belongs to the field of coal-bed gas exploitation, and particularly relates to an automatic well washing device for a coal-bed gas well. The automatic well washing device for the coal-bed gas well comprises a tank body, a high-pressure plunger pump system, an automatic control system and a switching assembly; a heat preservation circuit, the high-pressure plunger pump system, the automatic control system and the switching assembly are arranged in the tank body; the high-pressure plunger pump system injects water on the ground into the coal-bed gas well, the automatic control system monitors and controls a well field parameter and a well washing parameter in real time, and the switching assembly carries out control and protection on works of the heat preservation circuit, the high-pressure plunger pump system and the automatic control system in the tank body. According to the invention, a small-sized high-pressure plunger pump is adopted to replace a large-sized well washing vehicle and well washing equipment and the control system are skid-mounted, so that the well washing equipment for the coal-bed gas well is convenient to carry; remote automatic control can be implemented; times that workers go to the field to operate and control are reduced; working efficiency is improved; the well washing operation also can be carried out on rainy and snowy days and in the case of a relatively low air temperature; coal dust is timely discharged; downhole failures are reduced.

Description

technical field [0001] The invention belongs to the field of coal bed gas exploitation, and in particular relates to an automatic well flushing device for coal bed gas wells. Background technique [0002] Coalbed methane is a kind of unconventional natural gas generated from coal seams and stored in coal seams mainly in the state of adsorption, and its main component is methane. Coalbed methane drainage is also called drainage gas recovery. Water is discharged from the coalbed methane well through artificial lifting method, so that the pressure of the coal reservoir is reduced below the critical desorption pressure value of the coalbed methane, so that the adsorbed methane is desorbed into a large amount of free methane and transported to the wellhead. [0003] During the coalbed methane extraction process, a large amount of coal powder, mud sand and other abrasive particles are likely to be produced. Due to the small water production in the middle and later stages of the c...

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Problems solved by technology

[0003] During the coalbed methane drainage process, a large amount of coal powder, mud sand and other abrasive particles are likely to be produced. Due to the small water production in the middle and late stages of the coalbed methane well, coal powder sand particles and other particles cannot be carried out of the wellbore in time and deposit at the bottom of the well, causing pump suction Faults such as clogging, lax valve closure, pump jam, etc., and the dry friction between the sucker rod and tubing in wells with insufficient fluid supply accelerates the failure of sucker rod breakage and tubing leakage, thus greatly shortening the maintenance time of pump inspection and maintenance. The well cycle increases the development cost and seriously affects the continuity of coalbed methane drainage

The well-flushing equipment used on site is large and heavy, with cumbersome process and complex operation, and cannot be controlled remotely and automatically. However, most coalbed methane wells are located in mountainous areas with harsh conditions, and the equipment is inconvenient to carry. times, and it is impossible to wash the well in rainy and snowy weather and when the temperature is low, which greatly reduces the work efficiency

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