A Drainage Method for Coalbed Gas Horizontal Wells with Power Expansion, Pressure Relief and Permeability Enhancement

Abstract

A kind of coal seam -level yarn power -dynamic diameter dynamic diameter discharge and increased pumping method, which belongs to the field of mines gas treatment and coalbed methane, can solve the large amount of coal digging projects, high costs, under wells under the well, high cost, high cost, high cost, and high costs.There is a problem with hidden safety hazards in gas pumping. In the mine preparatory area and pioneering preparation area, the ground horizontal shaft is arranged along the recovery work surface to carry out gas pre -pumping, the horizontal well is empty, and the three -open shaft structure.The sleeve or glass reinforcement sleeve, the horizontal section performs high -pressure air power expansion diameter, determine the diameter and quantity of the diameter according to the diameter of the diameter.Unsolle, improve the capacity of ground coal seams, and ensure the sustainable and high yield of coalbed methane.Gradually replaced the bottom of the bottom of the well, shorten the pre -drawing time under the well, eliminate the prominent safety hazards of the underground gas, and reduce the risk of gas overrun and the cost of mining of coal mines.

Description

technical field [0001] The invention belongs to the technical field of mine gas treatment and coalbed methane co-exploitation, and in particular relates to a coalbed methane horizontal well dynamic diameter expansion, pressure relief and anti-reflection extraction method. Background technique [0002] Due to the complex structure, soft and brittle, and ultra-low permeability of the broken soft low permeability coal seam, the coal seam has poor air permeability and has a strong adsorption capacity for coal seam gas. How to efficiently extract the gas from the broken soft low permeability coal seam It has always been a technical problem in the extraction of coalbed methane from broken, soft and low-permeability coal seams. Ground drainage of coalbed methane from broken, soft and low-permeability coal seams is difficult, with low extraction efficiency, long time, and high cost. Fractured, soft and low-permeability coal seams have always been regarded as restricted areas for sur...

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Problems solved by technology

[0005] The present invention aims at the problems of large amount of underground coal mining and high cost in mining of coalbed methane in broken, soft and low-permeability coal seams, and certain potential safety hazards in underground gas drainage, and provides a coalbed methane horizontal well power expansion, pressure relief and permeability enhancement drainage method

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