Three-dimensional outburst prevention system and method for gas extraction based on complex structural belt

Abstract

The invention provides a three-dimensional outburst prevention system and method for gas extraction based on a complex structural belt, and belongs to the technical field of coalbed methane extraction. The system comprises a vacuum pump, a ground extraction pipeline, a water outlet, a Christmas tree, an oil pumping unit and a deep-well pump. Underground extraction equipment and ground gathering and transportation equipment are installed for discharging, extraction, collecting and transporting of a coal bed gas well, water in the well is extracted through the underground extraction equipment, the pressure in a shaft is reduced, and then the pressure of a coal reservoir is reduced, so that gas in the coal bed is desorbed. When the pressure in a pipe is reduced to be lower than a critical gasdesorption pressure of the coal bed, an extraction negative pressure is set and a vacuum pump is started, so that gas is extracted from the underground, and at the moment, the oil pumping unit and the deep-well pump work all the time to extract water in the well and discharge the water through a water outlet. The method solves the problems that the tunneling speed of a complex structural belt coal roadway is low due to the fact that the gas extraction effect through an underground drill hole in a geological structure zone is poor and the extraction standard-reaching time is long.

Description

technical field [0001] The invention belongs to the technical field of coalbed gas exploitation, and in particular relates to a three-dimensional outburst prevention system and method based on gas drainage in complex structural belts. Background technique [0002] At present, the outstanding control measures for complex structural belts only stay in the aspects of strengthening prediction and forecasting, implementing drilling drainage, expanding the scope of implementation measures, and strict management. Aiming at the problem of coal and gas outburst in complex geological structure belts, Polish scholars classify geological structure belts and adopt different management measures for different grades of geological structures. Domestically, measures such as release drilling combined with hydraulic punching are often used to extract coal seam gas in complex geological structure belts. However, when the main mining coal seam is a low-permeability coal seam and is located in a...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and provide a three-dimensional outburst prevention system and method based on gas drainage in complex structural belts to solve the situation where coal roadway excavation in complex structural belts is in contact with outbursts and due to geological structural belts. Poor effect of drilling gas drainage and long time to meet the standard of drainage caused by the problem of slow tunneling speed in coal roadways in complex structural belts

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