Pressure relief method of coal bed high-pressure waterpower bedding drilling and cutting

A hydraulic and high-pressure technology, applied in drilling equipment and methods, drilling equipment, earth-moving drilling, etc., can solve the problem that it cannot fundamentally guarantee the safe production of coal mines, reduce the strength and damage of pressure, and can not effectively reduce the number of times of pressure. and other problems, to achieve the effect of overall pressure relief, reduce the pressure strength and damage degree, transfer and reduce the local stress of the coal body

Active Publication Date: 2013-06-19
HUATING COAL GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production mining area of ​​Yanbei Coal Mine is affected by many factors such as structural stress, roof stress, and protective coal pillars. During the mining process, coal guns are prone to occur frequently, and strong mine pressure occurs, which may easily cause personnel injuries, roadway defor

Method used

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  • Pressure relief method of coal bed high-pressure waterpower bedding drilling and cutting
  • Pressure relief method of coal bed high-pressure waterpower bedding drilling and cutting
  • Pressure relief method of coal bed high-pressure waterpower bedding drilling and cutting

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Embodiment 1

[0030] Such as figure 1 As shown, the equipment and technology of the present embodiment are respectively as follows:

[0031] 1) Equipment

[0032] Slit pump: model BRW400 / 31.5 coal mine emulsion pump, rated pressure 31.5Mpa, rated flow 400L / min;

[0033] Water tank: iron, volume 3m 3 ;

[0034] Pressure gauge: model YHY60 (B) mine intrinsically safe digital pressure gauge.

[0035] 2) pipeline

[0036] High-pressure pipeline: select high-pressure hoses with inner diameters of Φ32mm and Φ19mm and a compressive strength of not less than 35MPa.

[0037] 3) Drilling tools

[0038] Drilling rig: ZYJ-680 ground climbing hydraulic drilling rig, drill pipe Φ50mm, drill bit Φ94mm, used for the construction of drilling 12 holes, and the aperture standard of the upper three holes is 2.0㎜, 2.5㎜, 3.0㎜.

[0039] 4) Process flow

[0040] Water pipe 1→water tank 2→connecting pipe 3→water injection pump 5 (measured by pressure gauge 4)→high pressure pipeline 8 (measured by water mete...

Embodiment 2

[0043] The equipment and process of this embodiment are the same as those in Embodiment 1.

[0044] Such as Figure 5 As shown, within the range of 8 to 15m from the orifice, the jet moves axially along the borehole 12, and first cuts a small section of coal uninterrupted radially to form the first disc-type pressure relief cavity 15, and then moves The slotted drill pipe is cut uninterruptedly to another small section to form the second disc-type pressure relief cavity 15. Repeat the above steps to make uninterrupted cutting of multiple small sections, and finally form several small sections of disc-type pressure relief cavity 15. The distance between two adjacent disc-type pressure relief cavities 15 is preferably 2-4m, preferably 2.5m, and the coal output of each disc-type pressure-relief cavity 15 is 0.15-0.3t, and the total coal output The amount is controlled at about 0.6-1.2t.

[0045]In order to achieve a better slotting effect, the present invention adopts a method...

Embodiment 3

[0047] The equipment and process of this embodiment are the same as those in Embodiment 1.

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Abstract

The invention discloses a pressure relief method of coal bed high-pressure waterpower bedding drilling and cutting. The pressure relief method of the coal bed high-pressure waterpower bedding drilling and cutting comprises: a plurality of drill hole positions are respectively distributed in surfaces of two sides of coal bodies and a surface of a head-on coal body in a heavily stressed concentration area of a transportation crossheading of a driving face; a hydraulic drilling rig is adopted to drill the drill hole positions, a preset dip angle is formed by the direction of drilling and a horizontal plane, and when a drill hole reaches the projected depth, the hydraulic drilling rig is stopped to drill; an end of a drill stem of the hydraulic drilling rig is connected with a jet device, and the jet device and the drill stem are both fed in the drill hole which is drilled; the hydraulic drilling rig is started to drive the drill stem and the jet device to rotate and carry out seam cutting operation, and a pressure relief cavity is formed in each coal body, the steps are repeated, the other drill hole positions are respectively carried out on a drilling operation and a seam cutting operation, and at last the pressure relief of each coal body is achieved. By the adoption of pressure relief method of the coal bed high-pressure waterpower bedding drilling and cutting, local stress of each coal body are effectively transferred and reduced, the whole pressure relief effect of a region of heavily stressed concentration is achieved, pressure arriving times are reduced, pressure arriving strength and degree of damage are reduced, and safety production is guaranteed.

Description

technical field [0001] The invention relates to the technical field of prevention and control of strong mine pressure disasters in the mining industry, in particular to a pressure relief method for coal seam high-pressure hydraulic drilling and cutting along the bedding. Background technique [0002] In recent years, with the improvement of my country's mining production capacity, the mining intensity has gradually increased, and the mining depth has also deepened, so that more areas of strong mine pressure appear more and more obvious. The stress of the coal body in the area where strong rock pressure appears is generally very large, and improper handling of the mining process is likely to cause rock pressure disasters. The production mining area of ​​Yanbei Coal Mine is affected by many factors such as structural stress, roof stress, and protective coal pillars. During the mining process, coal guns are prone to occur frequently, and strong mine pressure occurs, which may e...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B7/18
Inventor 谢俊文卢熹上官科峰窦林名杨世杰高含辉丁小敏何如成于贵良王爱军缪喜杨君赵克孝
Owner HUATING COAL GRP
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