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Method for draining gas of highly gassy coal mine

A gas drainage and gas technology, applied in the field of coal mining, can solve the problems of slow drainage, low efficiency and high cost, and achieve the effect of efficient gas drainage

Active Publication Date: 2011-03-16
CHINA UNITED COALBED METHANE NAT ENGRES CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the conventional methods of gas drainage in high-gas coal mines include: (1) drilling horizontal holes in the coal seam roof under the mine for drainage, but this method is very slow and inefficient; (2) opening auxiliary roadways in the coal seam floor, Then mine the upper gassy mine, using the method of mining the upper coal seam, the floor collapses, and the gas is drained, but this method is costly and takes a long time

Method used

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  • Method for draining gas of highly gassy coal mine
  • Method for draining gas of highly gassy coal mine
  • Method for draining gas of highly gassy coal mine

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Embodiment Construction

[0020] figure 1 It is a gas drainage method of high gas coal mine in the present invention. like figure 1 As shown, the method includes the following steps:

[0021] Step 101 , drill down the formation until the specified depth, and cement the casing in the lower layer to form a vertical well section in the surface layer.

[0022] In this step, a rotor in the field of oil drilling rigs can be used to drill down through the soft shallow formation.

[0023] Step 102 , the sidetracking is performed to open the window, and the deflection drilling is carried out until the landing point of the specified coal seam roof is reached, and the technical casing is cemented to form the deflection well section.

[0024] In this step, the landing point of the roof of the coal seam is pre-specified, so directional drilling is performed at the second opening, sidetracking to open the window and drilling to the destination.

[0025] Step 103, starting from the landing point of the roof of th...

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Abstract

The invention discloses a method for draining gas of a highly gassy coal mine. The method comprises the following steps of: 1, opening a downward drilling layer up to a specified depth, and performing surface casing well cementation to form a surface straight well section; 2, opening a side drilling window, making inclined drilling up to a landing point of a specified coal seam roof, and performing intermediate casing well cementation to form an inclined drilling well section; and 3, drilling in the coal seam roof from the landing point of the coal seam roof to form a plurality of broom-shaped horizontal branch wells, and draining the gas by using the plurality of broom-shaped horizontal branch wells. By the technical scheme, the gas can be quickly and effectively drained.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a gas drainage method for high gas coal mines. Background technique [0002] The mining of high-gas coal mines requires gas extraction first. At present, the conventional methods of gas drainage in high-gas coal mines are: (1) Drilling horizontal holes in the roof of the coal seam, but this method is very slow and inefficient; (2) Opening auxiliary roadways in the bottom of the coal seam, Re-mining the high-gas mines in the upper part uses the method of mining the upper coal seam, the bottom plate collapses, and the gas is drained, but this method is expensive and time-consuming. [0003] It can be seen that a fast and efficient gas extraction method is currently required. SUMMARY OF THE INVENTION [0004] In view of this, the present invention provides a gas drainage method for high-gas coal mines, which can quickly and efficiently drain gas. [0005] In order to achiev...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 鲜保安王德桂毛志新邓钧耀毕延森陈东彭宏钊陈震
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT
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