Drilling, cutting, discharging and diversion integrated coal seam physical and chemical combination permeability increase system and method

Abstract

The invention discloses a drilling, cutting, discharging and diversion integrated coal seam physical and chemical combination permeability increase system and method, and belongs to soft coal seam pressure relief permeability increase systems and methods. The system comprises a chemical supply jet flow generation device, a drilling, cutting and discharging integrated device and a water, coal and gas separation device. In the chemical supply jet flow generation device, high-pressure water and chemical reagents are fed into a jet flow mixer to be fully mixed through a high-pressure water pump and a chemical adding pump, so that chemical supply jet flow is formed. The drilling, cutting and discharging integrated device can achieve the integration of drilling, slitting and in-hole slag discharging, and the frequency of the phenomenon that holes are blocked in the slitting process is reduced. The water, coal and gas separation device can completely separate the water, coal slag and gas mixture ejected out in the slitting process, separated gas enters an extraction pipeline, and water enters a water tank after being filtered to be recycled. According to the system, ground stress and gas pressure are relieved through slitting, and physical permeability increase is achieved; under the combined action of physical and chemical permeability increase, the air permeability of a coal seam and the gas extraction effect are remarkably improved.

Description

technical field [0001] The invention relates to an anti-reflection system and method for pressure relief in soft coal seams, in particular to a combined anti-reflection system and method for coal seam physical and chemical integration of drilling, cutting, drainage and separation. technical background [0002] Gas occurrence in coal seams in my country has the characteristics of microporosity, low permeability, and high adsorption, and the average permeability of coal seams is only 1.1974×10 -18 ~1.1596×10 -14 m 2 . The low gas permeability of coal seam is one of the main reasons for the poor performance of coal seam gas drainage in high gas mines in my country. The hydraulic measures represented by the high-pressure jet coal seam hydraulic slotting realize the physical enhancement of the coal seam by forming a pressure relief space in the coal body, and have achieved good application results. However, as the depth of coal mining increases, the gas content of coal seams ...

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Problems solved by technology

[0004] Technical problem: The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a drilling, cutting, drainage and separation integrated coal seam physical and chemical joint anti-reflection system and method, to solve the problem of nozzle holes and coal body collapse that are prone to occur during the cutting process and gas exceeding the limit, etc., resulting in the clogging of the drill in the drilling hole and the blockage of the ejector, resulting in the forced suspension of the cutting operation and the deterioration of the environment of the workplace

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