Technical method for extracting coal bed methane from constructed coal development area

Abstract

The invention discloses a technical method for extracting coalbed methane from a constructed coal development area. The method comprises the following steps: (1) drilling a vertical shaft from the ground to a rock stratum; (2) drilling at the rock stratum; (3) carrying out shock blasting on the rock stratum; (4) drilling the vertical shaft to reach the depth of a coal bed and drilling at the coal bed; (5) carrying out pressure kick on the coal bed; and (6) carrying out development production on the coal bed, wherein the rock stratum area is positioned above a coal bed roof, the drilling direction of the rock stratum is parallel to the coal bed roof, and a distance is reserved between the rock stratum and the coal bed roof. By utilizing the technical method for extracting coalbed methane from the constructed coal development area, the pressure difference between the coal bed and the outside can be increased, and the air permeability of the coal bed is increased, so that the methane extraction effect of the constructed coal development area is greatly improved.

Description

technical field [0001] The invention relates to the field of coal-bed methane mining, in particular to a process method for extracting coal-bed methane in structural coal development areas. Background technique [0002] Coal seam gas is a kind of clean energy, but it is also a source of disaster for coal mine production. What kind of technological means can not only extract the gas in the coal seam, but also extract coal safely and efficiently has always been one of the key issues studied by coal producers and gas control workers. At present, the consensus on the mechanism of coal and gas outburst is that it is the result of the joint action of coal body structure, gas and geostress. Among them, the damage degree of coal determines the strength of gas outburst to a certain extent. At the same time, the area where structural coal develops is mainly affected by tectonic stress, which easily forms stress concentration. At the same time, the coal body structure suffers a certai...

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Problems solved by technology

In areas where tectonic coal develops, the coal body is soft, and the hole is easy to collapse when drilling; at the same time, even if a hole is formed, when reforming in these coal seams, because the coal itself does not have cracks, the current various technological means will affect the gas permeability of tectonic coal. Changes are suboptimal, and even local changes are very limited

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