Coalbed gas extraction and drilling water automatic drainage integrated device and method

Abstract

The invention discloses a coalbed gas extraction and drilling water automatic drainage integrated device and method. The device comprises a gas extraction system, a water guide system and a drainage system. The gas extraction system comprises an extraction pipe, a gas conveying pipeline and a connecting pipe, one end of the extraction pipe is located in a gas extraction drilled hole, and the otherend of the extraction pipe is connected with the gas conveying pipeline through the connecting pipe. The water guide system comprises a water guide pipe, a residue filtering sleeve and a water collecting tank, the upper end of the water guide pipe is connected with the extraction pipe, the lower end of the water guide pipe is connected with the water collecting tank, and the upper portion of thewater collecting tank is connected with the connecting pipe through a gas guide pipe. The drainage system comprises a drainage pipe, a drainage valve, a communicating pipe and a gas pressure balancingvalve, the drainage pipe is connected with the bottom of the water collecting tank, and the communicating pipe is located at a lower end opening of the water guide pipe. According to the coalbed gasextraction and drilling water automatic drainage integrated device and method, by means of the water guide system and the drainage system connected to the gas extraction system, water in the gas extraction drilled hole can be automatically drained while coalbed gas extraction is carried out, and the problem of drilled hole water accumulation in water-rich coalbed gas extraction can be effectivelysolved.

Description

technical field [0001] The invention relates to the technical field of coal seam gas drainage drilling equipment, in particular to an integrated device and method for coal seam gas drainage and automatic discharge of borehole water. Background technique [0002] my country's coal seam gas content is generally high, and more than 70% of the state-owned coal mines are high gas, coal and gas outburst mines. The existence of gas seriously affects the safe mining of coal mines. At present, the most common and effective technical means for mine gas control is coal seam Gas prepumping. Most coal seams not only contain a large amount of gas, but also contain a large amount of water. When the coal seam gas is extracted, the water in the coal seam will easily flow into the gas extraction borehole, resulting in water accumulation in the gas negative pressure extraction pipeline. Phenomenon, increasing the resistance in the negative pressure drainage pipeline, resulting in a large negat...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the existing gas drainage borehole water discharge equipment and discharge method, provide an integrated device and method for coal seam gas drainage and borehole water automatic discharge, and realize effective discharge of coal seam gas drainage borehole water , to overcome the lack of coal debris blocking the drainage pipeline in the drainage of borehole water, thereby effectively ensuring the gas drainage drilling service cycle and improving the efficiency of borehole gas drainage

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