Intelligent extraction, water drainage and slag discharge integrated system and method for downward drill hole of gas extraction

Abstract

The invention relates to the technical field of coal seam gas extraction drilling equipment, in particular to an intelligent extraction, water drainage and slag discharge integrated system and method for a downward drill hole of gas extraction. The integrated system comprises a gas extraction system, a water drainage and slag discharge system and an intelligent monitoring control system; the gas extraction system comprises an in-hole extraction pipe arranged in the downward drill hole; the in-hole extraction pipe is communicated with a gas path collecting pipe through a gas guide branch pipe; the top of the gas path collecting pipe is communicated with an air guide pipe; the air guide pipe is connected with a compressed air main pipe; the gas path collecting pipe is connected with a gas-liquid separator through a gas path connecting pipe; the gas-liquid separator is communicated with a gas extraction main pipe through an extraction connecting pipe; the water drainage and slag discharge system comprises a water drainage and slag discharge pipe arranged in the downward drill hole; a drill hole sealing section is arranged at the hole opening position of the downward drill hole; the water drainage and slag discharge pipe penetrates into the bottom of the downward drill hole and is communicated with a water conveying collecting pipe through a water conveying branch pipe; the water conveying collecting pipe is connected with the gas-liquid separator through the water conveying connecting pipe; and the bottom of the gas-liquid separator is communicated with a water drainage pipeline.

Description

technical field [0001] The invention relates to the technical field of drilling equipment for coal seam gas drainage, in particular to an integrated system and method for intelligent drainage, drainage and slag discharge of downhole drilling for gas drainage. Background technique [0002] Coal seam gas is the "number one killer" that threatens the safety of coal mine production. In 2020, there were 123 coal mine accidents and 228 deaths across the country, including 7 gas accidents and 30 deaths. As an associated product of coal, gas (coal bed methane) is not only a major disaster source and air pollution source in coal mines, but also a valuable clean energy. At present, the most common and effective technical measure to solve the problem of mine gas is to lay out boreholes for gas drainage. Reasonable drainage of coal seam gas before the mining of coal resources can not only reduce environmental pollution, but also ensure safe production in coal mines, and at the same time...

AI Technical Summary

Problems solved by technology

The hydraulic slag discharge process is generally used in the construction of downhole drilling, which makes it difficult to effectively discharge the large amount of water and coal slag accumulated in the borehole during the gas drainage process; During the gas extraction process, the water around the hole wall will flow into the borehole, resulting in water accumulation in the borehole

The accumulated water in the borehole will not only form a water seal effect, block the gas migration channel, greatly reduce the efficiency of gas drainage, but also cause the wall of the borehole to become unstable and collapse under long-term immersion, and even cause the entire gas drainage borehole to fail

[0004] At present, in order to solve the problem of water and slag accumulation in downward drilling, the existing technical measures and equipment mainly use drainage pumps or compressed air pipelines to directly discharge the water and slag in the hole after the drilling construction is completed, which can only be used as a temporary The drainage and slag discharge method cannot effectively discharge the accumulated water and coal slag in the borehole during the entire gas drainage period, and cannot realize the automatic drainage and slag discharge of multiple drilling holes linkage control; Regular drainage and slag removal of boreholes is not only low in automation and poor in effect, but also easily causes blockage of drainage pipelines, and it cannot be effectively drained and slag removed according to the actual water accumulation in the borehole

Therefore, in view of the problems of easy water accumulation, difficult drainage and slag discharge, and poor effect of existing technologies in the downward gas drainage drilling, a reliable and effective downward drilling intelligent drainage and slagging integrated system for gas drainage is developed. and methods are urgently needed

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