High-pressure abrasive gas jet equipment and method for breaking coal pressure, releasing pressure and increasing permeability

Abstract

The invention provides high-pressure abrasive material gas jet coal-breaking pressure relief and permeability improvement equipment and a method and belongs to the technical field of underground coal mine gas treatment. The equipment comprises a high-pressure air generating device, an abrasive material tank and a drilling machine. The drilling machine comprises a drilling rod and a drilling bit. A nozzle is arranged on the drilling bit. An outlet of the high-pressure air generating device is connected with a high-pressure air inlet of the abrasive material tank. A high-pressure abrasive material air outlet of the abrasive material tank and an outlet of the high-pressure air generating device are communicated with an inlet pipeline of the drilling machine through a tee joint. The inlet pipeline of the drilling machine is provided with a sealing rotating device. The high-pressure air inlet of the abrasive material tank and the high-pressure abrasive material air outlet are each provided with one valve. According to the high-pressure abrasive material gas jet coal-breaking pressure relief and permeability improvement equipment and method, the purposes of coal breaking, pressure relieving, permeability improving and reinforced pumping and discharging can be achieved, the equipment can be applied to and popularized in soft coal beds better, and the problems of hole collapse and low gas extraction rate frequently occurring in the punching process of water power are solved.

Description

technical field [0001] The invention belongs to the technical field of underground gas control in coal mines, and is particularly suitable for pressure relief and antireflection enhancement in soft coal seams and gas drainage operations, and in particular relates to a high-pressure abrasive gas jet for breaking coal and pressure relief and antireflection enhancement equipment and methods. Background technique [0002] As a kind of clean energy, gas has been paid more and more attention by scholars and society, and has become an important part of my country's energy strategy. During the "Twelfth Five-Year Plan" period, my country's planned development goal is: the output of coalbed methane will reach 30 billion cubic meters, of which 16 billion cubic meters will be developed on the ground, and basically all of them will be utilized, and 14 billion cubic meters will be extracted from underground gas, with a utilization rate of more than 60%. However, with the increase of minin...

AI Technical Summary

Problems solved by technology

For the down hole, the water at the bottom of the hole is likely to cause muddying of the coal body and block the gas drainage channel

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