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Bed-parallel drilling slot pressure relief permeability increase method

A technology of bedding drilling and slotting, which is applied in the field of bedding drilling and slotting for pressure relief and antireflection, and can solve problems such as the inability to fundamentally ensure safe and efficient production of the mining face, inability to relieve pressure and increase the permeability of coal seams, and induce outbursts, etc. problems, to achieve the effect of widely popularizing the application value, good drainage effect, and reducing the stress level of coal mass

Active Publication Date: 2018-07-27
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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Problems solved by technology

Although these measures have achieved certain effects in improving the drainage rate of low-permeability and high-gas coal seams, there are obvious limitations. Some mines have adopted anti-permeability measures to induce accidents such as outbursts and tunnel collapses, and the effect is not good; in addition, continuous unloading of coal seams is not possible. It cannot fundamentally guarantee the safe and efficient production of the mining face

Method used

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  • Bed-parallel drilling slot pressure relief permeability increase method
  • Bed-parallel drilling slot pressure relief permeability increase method
  • Bed-parallel drilling slot pressure relief permeability increase method

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Embodiment Construction

[0030] As shown in the figure, the method for pressure relief and antireflection of layer-by-layer drilling and slotting in this embodiment includes the following steps:

[0031] (1) According to the design requirements of bedding gas drainage drilling, the bedding gas drainage drilling 1 is respectively constructed in the coal body 4 of the transportation trough 5 and the track trough 6 on the mining face, that is, the high-pressure hydraulic slotting device is used Construction bedding gas drainage borehole 1 is formed to form borehole 1; the length of the borehole is 80-180m; the high-pressure hydraulic slotting device can be the structure disclosed in CN 106150500 A, which will not be repeated here, and its rated pressure is 100- 150MPa, the rated flow rate is 80-125L / min.

[0032] (2) Without retreating the drill, feed high-pressure water into the high-pressure hydraulic cutting device to cut the coal body in a circular and circular direction to form a disc-shaped slot; t...

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Abstract

The invention discloses a bed-parallel drilling slot pressure relief permeability increase method which includes the steps: (1) performing construction on bed-parallel gas extraction drilling by the aid of a high-pressure hydraulic slotting device to form a drilled hole according to bed-parallel gas extraction drilling design requirements; (2) leading high-pressure water into the high-pressure hydraulic slotting device without withdrawing a drill to rotatably and circumferentially cut coal to form a disc-shaped slot; (3) withdrawing the drill after the disc-shaped slot is formed, and radiallycutting the coal without rotating a drill bit and a drill rod to form a radial slot; (4) repeating the step (2) and the step (3), and forming a plurality of disc-shaped slots and a plurality of radialslots in the same drilled hole; (5) repeating the step (1) to the step (4), and performing drilling and slotting on the other bed-parallel drilled holes. According to the method, horizontal and vertical stress of a coal layer is reduced, drilling gas extraction concentration and flow is improved, the bed-parallel drilling number of a working surface is decreased, and the method is simple and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of gas drainage in coal mines, in particular to a method for pressure relief and permeability enhancement by slit drilling in bedding. Background technique [0002] Coal and gas outbursts and rock bursts in deep mining are very serious and common natural disasters that threaten the safe production of coal mines. According to incomplete statistics, gas dynamic disasters have occurred in more than 20 countries and regions. The total number of disasters is more than 50,000, and more than 35,000 people died. Among them, rock burst accidents are also increasing year by year. With the increase of mining depth, the gas pressure, gas content and ground stress of coal seams increase, and the outburst danger of outburst mines becomes more and more serious, which has become one of the main problems threatening the safe production of mining areas; in addition, the increase of mining depth, The increase of mine pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26
CPCE21B43/26E21F7/00
Inventor 张永将袁本庆李成成陆占金孟贤正曹建军杨慧明
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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