Efficient water injection method and device of hydraulic fracture permeability increase auxiliary coal seam

Abstract

The invention discloses an efficient water injection method and device of a hydraulic fracture permeability increase auxiliary coal seam. Before coal seam static pressure water injection, high pressure water generated by an emulsion pump is injected into a drilled static pressure water injection drilled hole through a high pressure pipeline, high pressure water is injected into a coal body fracture by means of the cutting and fracturing effect of a water wedge generated by the high pressure water on the coal seam on the periphery of the drilled hole to overcome the minimum principal stress and the anti-fracture pressure of the coal body, so that fractures are broadened, extended and communicated; in the fracturing process, quartz sand is added into the high pressure water, the quartz sand enters the fractures along with the high pressure water, the effect of a supporting agent is achieved, and the water injection drilled hole is connected to a static pressure pipeline to perform static pressure water injection on the coal seam after hydraulic fracturing is finished. Before static pressure water injection is performed, the breathability of a water pre-injection coal seam is increased, so that the coal seam water injection speed is increased, and the water injection efficiency and effect are improved. According to the method, no special emulsion pump is needed, the running time of the emulsion pump is short, the drilling construction work amount can be decreased, and the water injection working efficiency is improved.

Description

technical field [0001] The invention belongs to the field of mine disaster prevention and control, and in particular relates to a high-efficiency water injection method and equipment for hydraulic fracturing and anti-permeability auxiliary coal seam injection. Background technique [0002] With the increase of coal mining depth and the improvement of mechanized mining in my country, the hazards of natural disasters such as coal dust, rock burst and ground temperature are constantly escalating, and disasters and accidents occur frequently, which seriously threaten the safe and efficient mining of coal mines in my country and the safety of underground workers. Physical and mental health. Coal seam water injection is an important technical means to prevent various disasters in mines. It is the most fundamental and effective measure to reduce the generation of dust in coal mining work. Since the reform and opening up, most coal mines in my country have used coal seam water injec...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a hydraulic fracturing and anti-permeability auxiliary coal seam efficient water injection method and equipment. Especially the difficulty of water injection in poorly permeable coal seams

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