Method for gas extraction through bedding directional long drill hole traversing working face in broken and soft coal seam

A technology of gas drainage and long boreholes, which is applied in the fields of long borehole gas drainage and directional long borehole gas drainage in broken soft coal seams, to achieve low entry resistance, increase utilization rate, and increase borehole depth Effect

Inactive Publication Date: 2018-02-27
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of hole formation mainly based on depth and precision in the drilling construction of gas drainage in sof

Method used

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  • Method for gas extraction through bedding directional long drill hole traversing working face in broken and soft coal seam
  • Method for gas extraction through bedding directional long drill hole traversing working face in broken and soft coal seam
  • Method for gas extraction through bedding directional long drill hole traversing working face in broken and soft coal seam

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Example Embodiment

[0039] Examples:

[0040] Step 1: Design of Directional Long Drilling Hole for Gas Drainage in Broken Soft Coal

[0041] Drill holes are designed according to the requirements of gas extraction. The drilling depth requirements: from the excavated roadway (1) through the coal mining face (I) to the roadway to be excavated (7), while ensuring the length of the roadway (7) Not less than the required control range (Ⅱ) of roadway excavation, generally 15m or 20m, which meets the requirements of coal mine safety regulations and outburst prevention regulations. In terms of drilling arrangement, the design drilling (6) can be arranged in parallel, fan-shaped, or a combination of several methods based on actual conditions and needs; the spacing of the drilling (6) is determined by the gas drainage radius R (drilling spacing) ≤2R).

[0042] Borehole inclination angle: The borehole inclination angle of the designed borehole (6) at different depths is determined according to the undulations of...

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Abstract

The invention relates to a method for gas extraction through a bedding directional long drill hole traversing working face in a broken and soft coal seam. According to the method, through an air screwmotor directional drilling technology, the bedding gas extraction long drill hole is constructed in a tunneled roadway on one side of the working face of the coal seam, and the drill holes penetratesthrough a to-be-tunneled roadway on the other side of the working face to the position, within the control range of 15-20 m, of the outer side of the roadway; and after the drill hole is completed, adrill tool is lifted up, an open-close type guiding drill bit and a drill rod with a large through hole are put down, then a hole protection screen pipe is put down through the center of the drill rod, then the drill rod is lifted up, the screen pipe stays in the hole, and then a gas extraction pipeline is connected for gas pre-extraction. An air screw motor directional drilling method is adoptedin the gas treatment technology so that the drilling depth of bedding extraction of the broken and soft coal seam and the coal seam drilling-encounter rate can be greatly increased, invalid footagesare reduced in quantity, meanwhile the drill hole coverage range is ensured, the purpose of gas pre-extraction outburst elimination of the stope face and the to-be-tunneled roadway is achieved, and safe tunneling of the coal seam roadway and safe extraction of coal extraction work face are ensured.

Description

technical field [0001] The invention relates to a gas extraction method with long boreholes, which belongs to the technical field of gas control, and in particular to a method for gas extraction with long boreholes along the bedding direction of broken and soft coal seams crossing the working face. Background technique [0002] With the increase of coal mining depth and the expansion of mining scope, it is becoming more and more difficult to control coal seam gas with drilling drainage as the main technical means. In the soft and broken coal seam, gas drainage drilling is prone to collapse and sticking, and there is a problem that it is difficult to form a hole. At present, the rotary drilling method using air as the slag discharge medium or the rotary drilling method of large auger drill rods are generally used. Carry out drilling construction for gas drainage; while using rotary drilling, it is difficult to control the drilling trajectory, and it is easy to drill into the ...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B43/10E21B43/00E21F7/00
CPCE21B7/04E21B43/10E21B43/121E21F7/00
Inventor 王毅童碧张杰陈建王力袁安营黄寒静李明强侯红翟艳鹏徐保龙李勇
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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