Novel process for abandoned mine downhole gas control

Abstract

The invention provides a novel process for abandoned mine downhole gas control. The novel process comprises the steps that (1) before an abandoned coal mine is closed, downhole branched roadways are blocked, and steel pipe holes are reserved in the upper portions of blocking walls to enable the interior to communicate with the exterior; (2) the reserved steel pipe holes of the multiple downhole branched roadway blocking walls are connected with a downhole gas pumping and discharging main system to conduct gas pumping and discharging; (3) blocked roadway drainage water communicates with main roadway drainage water, a water storage bin is built at a low downhole position, a water suction pump and a water pipe are mounted to pump and drain downhole gushing water to the ground, and the normal pumping and drainage effect of the downhole gushing water can be achieved after the coal mine is closed; (4) a main pithead and a vice pithead of the abandoned mine are closed, a footrill and an inclined shaft are filled with laying material rock walls and loess, steel pipes are embedded into the footrill and the inclined shaft, a main pithead and a vice pithead of a vertical shaft are blocked through reinforced concrete cover plates, and meanwhile, steel pipes are embedded into the main pithead and the vice pithead of the vertical shaft to enable the interiors of the pitheads to communicate with the exteriors of the pitheads; and (5) downhole gas is discharged and extracted through ground gas discharging and extraction equipment. The novel process can achieve the purposes of abandoned mine downhole gas comprehensive control and utilization.

Description

technical field [0001] The invention belongs to the field of mine gas control, and in particular relates to a new process technology of abandoned mine gas control. Background technique [0002] Abandoned coal mine gas refers to the methane resources in the remaining coal seams, surrounding rocks and underground confined spaces that remain in the remaining coal seams, surrounding rocks and underground confined spaces in mines that are closed due to the depletion of coal resources or other non-compliance with safety production requirements and policy reasons. The development and utilization of abandoned mine gas is to take certain sealing measures before the coal mine is about to be closed, and use the original gas drainage system to extract gas from the ground for utilization. Domestically, there are only some theoretical researches on abandoned mine treatment technology, and there is no successful experience or project at present. Although some mining areas have carried out...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies in the existing abandoned coal mine gas treatment, and provide a roadway blockage, reserved holes, gas pumping and drainage pipeline system connection transformation, and pumping system transformation under the abandoned coal mine. mining equipment to discharge underground gas to achieve the effect of comprehensive treatment and utilization of abandoned mine gas

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