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

A process method and technology in the development area, which are applied in the fields of mining fluids, mining equipment, and earth-moving drilling, etc., can solve the problems of easy-to-collapse holes, unsatisfactory changes in tectonic coal permeability, and limited change ranges.

Inactive Publication Date: 2013-09-25
HENAN POLYTECHNIC UNIV
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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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  • Technical method for extracting coal bed methane from constructed coal development area
  • Technical method for extracting coal bed methane from constructed coal development area
  • Technical method for extracting coal bed methane from constructed coal development area

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Embodiment Construction

[0022] Depend on Figure 1-Figure 3 A method for extracting coalbed methane in a tectonic coal development area includes the following steps:

[0023] (1) Drill a vertical well from the ground to the rock formation drilling place. The vertical well will first pass through the overlying rock layer 34 from the ground and then reach the roof rock layer 33. The roof rock layer 33 is the rock layer area to be drilled, which is located above the coal seam roof , the rock formation is drilled within the range of 5-20m above the roof of the coal seam to be mined, and the rock formation to be drilled is relatively hard, and the thickness of the rock formation is ≥ 4.5m; (the rock formation is drilled at 5-20m above the roof of the coal seam to be mined Within the scope, the thickness of the rock strata is more than or equal to 4.5m, which is the best condition for the coalbed methane extraction process in the tectonic coal development area of ​​the present invention. If this condition ...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/25E21F7/00
Inventor 倪小明刘晓苏现波贾炳吕闰生王向浩
Owner HENAN POLYTECHNIC UNIV
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