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High-level parallel drilling gas extraction method in swelling rock strata

A technology of gas drainage and rock formation, which is applied in the field of coal mine gas drainage to achieve the effect of ensuring stability

Pending Publication Date: 2019-09-20
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Description
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Problems solved by technology

[0006] Aiming at the technical problems existing in the current prior art for gas drainage in coal seams with expansive rock formations, the present invention proposes a gas drainage method for high-level parallel drilling in expansive rock formations

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  • High-level parallel drilling gas extraction method in swelling rock strata
  • High-level parallel drilling gas extraction method in swelling rock strata
  • High-level parallel drilling gas extraction method in swelling rock strata

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Embodiment Construction

[0032] Refer to the attached Figure 1-3 And embodiment the present invention is described in detail:

[0033] Such as Figure 1-3 As shown, a kind of expansive rock formation high level parallel borehole gas drainage method of the present invention comprises the following steps:

[0034] Step 1: Arranging a drilling site in the air return roadway 2, using a drilling rig to drill holes vertically to the roof of the coal seam.

[0035] Step 2, when the drilling rig reaches the expansive rock formation 4 , drill vertically upwards and pass through the expansive rock formation 4 .

[0036] Step 3: After the drilling rig drills through the expansive rock formation 4 , the drilled hole is reamed to form the first hole segment 9 .

[0037] Step 4: Carry out casing operation on the first hole section 9 and fix the pipe with cement slurry.

[0038] Step five, continue drilling along the first hole section 9 with the deflection drilling tool to form a second hole section 10 with a ...

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Abstract

The invention provides a high-level parallel drilling gas extraction method in swelling rock strata. The technical problems existing in gas extraction on coal seams of the swelling rock strata in the prior art are solved. The high-level parallel drilling gas extraction method in swelling rock strata comprises the steps that a drilling field is arranged in a return air tunnel and drilling holes are constructed vertically to a roof of a coal seam by using a drilling rig; when the drilling rig reaches the swelling rock stratum, drilling vertically upwards is carried out, and the drilling rig penetrates through the swelling rock stratum; the drilled holes are enlarged to form a first hole section; casing running operation is carried out and cement slurry is used for fixing pipes; drilling along the first hole section is continued with a deflecting drilling tool so that a second hole section with a certain inclined radian is formed; after the drilling of the second hole section is completed, the casing running operation can be carried out, and the drilling is continued in an extending mode along the second hole section into the coal seam, and it is ensured that the drilling inclination is consistent with the coal seam dip angle, so that a third hole section parallel to the coal seam dip angle is formed; and gas extraction pipe communicates with an extraction device to carry out the gas extraction operation.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and in particular relates to a method for gas drainage of high-level parallel boreholes in expansive rock formations. Background technique [0002] In recent years, the mining depth of mines has been increasing, so the number of various accidents in mining has increased, and the casualties of personnel have also increased. Among them, the probability of explosions due to the increase in gas emission has continued to increase. Serious threat to mine safety production. Therefore, the research and application of gas drainage in coal mines, especially the technology of gas drainage in high-level boreholes is imminent. [0003] Under the precondition of draining the goaf or surrounding rock gas, the high-level drilling can intercept the movement of gas from adjacent layers to the goaf, and can effectively solve the problem of return air flow and gas overrun in the upper corner. It...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B7/04E21B7/28E21B7/20E21B33/13E21B7/06E21B33/03
CPCE21F7/00E21B7/04E21B7/28E21B7/20E21B33/13E21B7/06E21B7/064E21B33/03
Inventor 连红军崔啸张嘉勇郭立稳苏霈洋艾子博贾静
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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