A system and process for gas explosion coal seam enhancement in the late stage of induced drilling drainage

Abstract

The invention relates to a system and process for coal seam permeability improvement by inducing hole drilling extraction later-period gas burning explosion. The left end of a connecting pipe (2) is connected with a first gas extraction pipe (1); the right end of the connecting pipe is connected with a sealed gas extraction drilling hole (17); a third electromagnetic valve (8) is arranged on a water conveying pipe (10); a water discharging pipe (13) is arranged on a pipeline for connecting the third electromagnetic valve and the connecting pipe; a fourth electromagnetic valve (9) is arranged on the water discharging pipe; a first electromagnetic valve, a second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, a temperature sensor, a methane sensor and a carbon monoxide sensor are connected with an intelligent controller (12) through connecting wires (11); and an electric spark igniter (14) is connected with an external power supply switch through a conducting wire. The system has the advantages that the operation is simple; the real-time monitoring can be realized; the manual coal seam burning explosion permeability improvement induction is realized; the gas permeability of a coal seam can be improved in a short time; and the problems of high-gas low-permeability coal seam gas extraction difficulty and fast extraction concentration reduction are solved.

Description

technical field [0001] The invention relates to a coal seam anti-permeability system and process, in particular to a coal seam anti-permeability system and process in the later stage of induced drilling drainage, and belongs to the technical field of coal seam anti-permeability gas drainage. Background technique [0002] Coal seam permeability enhancement is the main way to increase gas extraction. At present, the main anti-permeability measures for a single coal seam in coal mines include hydraulic anti-permeability and blasting. However, both of these two anti-reflection measures have certain limitations: hydraulic anti-permeability measures such as hydraulic fracturing, hydraulic slotting and hydraulic punching are easy to induce in-hole accidents such as collapse holes and injection holes in soft and low-permeability coal seams. The gas flow channel is blocked, and limited by the surface tension of the water, the penetration range is limited. The fracture initiation pr...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a system and process for inducing gas detonation and anti-reflection coal seams in drilling holes. Increase the air permeability of the coal seam, solve the problem of difficult gas extraction in high-gas and low-air-permeable coal seams, and the rapid decline in the concentration of the gas, so that the detonable gas concentration distribution area in the hole is uniform and continuous, and will not cause ignition and detonation failure and the range of combustion and explosion in the hole is affected. limit

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