Well wash-able coal seam gas drainage and mining device

Abstract

The invention relates to a coal seam gas mining device. The well wash-able coal seam gas drainage and mining device comprises an oil pipe, a hollow rod and a well washing drainage and mining pump, the lower portion of the hollow rod is arranged inside the oil pipe, and the well washing drainage and mining pump is connected with the hollow rod and the lower end of the oil pipe; the well washing drainage and mining pump comprises an oil pipe connector, the oil pipe is connected with the upper end of the oil pipe connector, an outer cylinder is connected with the outer wall of the lower portion of the oil pipe connector, and a tail connector is connected with the lower end of the outer cylinder; a pump cylinder is connected with the inner wall of the lower portion of the oil pipe connector, a plunger piston is arranged on the upper portion in the pump cylinder, and the hollow rod is connected with the upper end of the plunger piston; a travelling valve is arranged in the lower portion of the plunger piston, a fixed valve is arranged on the middle in the pump cylinder, the outer wall of the lower portion of the pump cylinder is sleeved with a sliding sleeve, a spring is connected with the lower portion of the sliding sleeve, and the tail connector is connected with the lower end of the spring. According to the well wash-able coal seam gas drainage and mining device, oil pipe well washing operation can be conducted at any time in the production process, the damage of a coal seam is avoided, and coal dust in the pump cylinder and a fluid production pipe is washed out to the ground so that the pump checking period can be shortened.

Description

technical field [0001] The invention relates to a coalbed methane mining equipment, in particular to a well-washable coalbed methane drainage equipment used for coalbed methane development. Background technique [0002] In the process of developing coalbed methane with the existing coalbed methane drainage equipment, with the reduction of coalbed water, the produced water in the coalbed is getting less and less, and the content of coal powder in the produced water is getting higher and higher. In addition, after the coalbed methane production well is fractured, There will also be high coal powder content, and the fine coal particles (sand) in the tubing will continue to deposit under the action of its own weight, causing pump valve blockage or pump jamming; currently only through frequent workover operations to check the pump to solve the problem , which reduces the time for normal drainage and gas recovery, and increases the workover cost. Contents of the invention [00...

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Problems solved by technology

[0002] During the process of exploiting coalbed methane with the existing coalbed methane drainage equipment, with the reduction of coalbed water, the coal seam produced water is getting less and less, and the produced water and pulverized coal content In addition, after the fracturing of coalbed methane production wells, the coal powder content will also be high, and the fine coal particles (sand) in the tubing will continue to deposit under the action of its own weight, causing pump valve blockage or pump jamming, etc. Phenomenon; at present, it can only be solved by frequent workover operations and pump inspection measures, which reduces the time for normal drainage and gas recovery and increases workover costs

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