A kind of pulse hydraulic fracturing coal seam pressure relief and permeation enhancement device and pressure relief and permeation enhancement method

Abstract

The invention belongs to the technical field of pressure relief and permeability enhancement of coal seams and gas extraction in coal mines, and specifically discloses a pulse hydraulic fracturing coal seam pressure relief and permeability enhancement device and a pressure relief and permeability enhancement method. The device mainly comprises a water tank, a high-pressure water pump, a pressure gauge, a high-pressure It is composed of water storage tank, pneumatic valve, solenoid valve group, control cabinet, etc. The device injects high-pressure water formed by high-pressure water pump into the high-pressure water storage tank, and controls the opening and closing of solenoid valve, pneumatic valve and ejector pump through the control cabinet to form high pressure Pulse fluid, the high-pressure pulse fluid reaches the cracker through the conveying rod, and the cracker generates periodic expansion under the action of the high-pressure pulse fluid, thereby generating periodic tensile and compressive stress of compression-expansion-compression on the coal wall, causing cracks in the coal seam. Continuously develop and form a dense and continuous fracture network, so as to achieve the purpose of decompressing the coal seam and strengthening gas extraction.

Description

technical field [0001] The invention belongs to the technical field of pressure relief and permeability enhancement of coal seams in coal mines and gas drainage, and in particular relates to a pressure relief and permeability enhancement device and a pressure relief and permeability enhancement method for pulse hydraulic cracking and cutting coal seams. Background technique [0002] In recent years, with the development of my country's economy and the improvement of people's living standards, the demand for thermal coal in my country has continued to increase. At present, with the continuous increase in the mining depth of coal mines in my country, the gas in the mine is characterized by high stress, high gas pressure and low permeability. The characteristics of coal are present in the coal seam, and the accompanying coal and rock dynamic disasters represented by coal and gas outburst are becoming more and more prominent, which seriously affects the normal mining of coal in my...

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Problems solved by technology

However, judging from the current use of pulsating hydraulic fracturing technology, it uses the adjustment of surface fracturing pumps to form too much pulse pressure that is lost to the wellbore and fracturing fluid. Anticipated purpose of using high pressure water pulse pressure to enhance coal seam fracture propagation

In addition, both hydraulic fracturing technology and pulsating hydraulic fracturing technology are used in soft coal seams. The fracturing cracks formed in soft coal seams during the fracturing process will gradually close with the increase of construction time, affecting gas In addition, the proppant used in the fracturing process and the chemical agents in the fracturing fluid will produce a water lock effect that affects the gas desorption and damages the coal seam. big damage

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