Coal seam extraction drilling hot-cold impacting coal-breaking permeability-increasing device and permeability-increasing method

Abstract

The invention relates to a coal seam extraction drilling hot-cold impacting coal-breaking permeability-increasing device. The coal seam extraction drilling hot-cold impacting coal-breaking permeability-increasing device comprises a bearing base, a traveling mechanism, a liquid nitrogen storage steel bottle, a gaseous nitrogen storage steel bottle, a water storage tank, a hot-air blower, booster pump assemblies, nitrogen heating pipes, water cooling pipes and liquid nitrogen cooling pipes. The lower surface of the bearing base is connected with the traveling mechanism, and the liquid nitrogen storage steel bottle, the gaseous nitrogen storage steel bottle, the water storage tank, the hot-air blower and the booster pump assemblies are slidably connected with the upper surface of the bearing base through a slide rail. A fracture impacting assembly is formed by each nitrogen heating pipe, the corresponding water cooling pipe and the corresponding liquid nitrogen cooling pipe. The fracture impacting assemblies communicate with the two booster pump assemblies. A permeability-increasing method of the coal seam extraction drilling hot-cold impacting coal-breaking permeability-increasing device comprises the steps such as drill hole forming, fracture impacting assembly prefabricating, impacting fracture operation and extraction operation. According to the coal seam extraction drilling hot-cold impacting coal-breaking permeability-increasing device and the permeability-increasing method, on the one hand, drilling gas extraction efficiency is improved, gas extraction cost is reduced, and on the other hand, safety and reliability of gas extraction operation are improved.

Description

technical field [0001] The invention relates to a thermal and cold impact coal breaking coal penetration enhancement device and a penetration enhancement method for coal seam drainage drilling, and belongs to the technical field of gas drainage. Background technique [0002] At present, when collecting and recovering gas resources such as coal seam gas, it is mainly through fracturing the surface of the borehole, and after increasing the number, width and depth of coal seam cracks, the negative pressure drainage operation is carried out. When performing fracturing operations, in order to improve the safety and economy of the operation, the low-temperature and high-pressure inert gas is mainly used to perform high-pressure impact pressure on the borehole wall in the borehole to realize the need for fracturing the coal seam on the borehole wall. Driven explosive blasting, high-pressure air, and high-pressure water fracturing operations can effectively improve the safety and wo...

AI Technical Summary

Problems solved by technology

[0002] At present, when collecting and recovering gas resources such as coal seam gas, it is mainly through fracturing the surface of the borehole, and after increasing the number, width and depth of coal seam cracks, the negative pressure drainage operation is carried out. When performing fracturing operations, in order to improve the safety and economy of the operation, the low-temperature and high-pressure inert gas is mainly used to perform high-pressure impact pressure on the borehole wall in the borehole to realize the need for fracturing the coal seam on the borehole wall. Driven explosive blasting, high-pressure air, and high-pressure water fracturing operations can effectively improve the safety and work efficiency of drilling fracturing operations, but in actual use, it is found that the current low-temperature, high-pressure inert gas for drilling However, there are often problems such as: it is difficult to quantitatively measure the range of drilling impact and the accuracy is poor; the range of inert gas freezing and high-pressure impact anti-permeability is limited; the number of coal seam cracks is relatively small, and the number, depth and width of cracks are relatively small As a result, there are disadvantages such as low gas flow rate, low drainage efficiency, small drainage coverage, and periodic periods of drilling and drainage operations during gas extraction from boreholes, which seriously restricts the working efficiency of gas drainage operations, and Increased the cost of extraction operations. At the same time, when the current low-temperature and high-pressure inert gas is used for drilling fracturing operations, the dilution and suppression of the gas gas in the previous drilling hole is relatively insufficient, and it is easy to cause gas leakage in the ventilation lane. Therefore, in order to solve this problem, it is urgent to develop a new anti-permeability device for coalbed methane drainage and a coalbed methane drainage system based on this device. technology to meet the needs of practical use

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