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Low-permeability strong-adsorbability coal body heat injection gas treatment method

A strong adsorption, low permeability technology, applied in gas discharge, earthwork drilling, safety devices, etc., can solve the problems of limited gas volume, low drainage efficiency, and long gas drainage time.

Pending Publication Date: 2021-11-02
CHINA COAL TECH ENG GRP CHONGQING RES INST
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the coal mines in my country adopt the method of pre-extracting gas by reducing the pressure of coal reservoirs due to the mature technology. For the gas control of low-permeability coal seams, since the free state of gas is less, most of the gas exists in the state of adsorption. No matter how hard you work on the reservoir pressure, the amount of gas extracted is always limited. In this way, the gas extraction time for low-permeability and strong-adsorption coal bodies is relatively long, and the extraction efficiency is low. After the inspection is up to standard, mining activities During the period, the amount of gas emission remained at a relatively high level, which is not conducive to the normal mining of coal mines

Method used

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  • Low-permeability strong-adsorbability coal body heat injection gas treatment method
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  • Low-permeability strong-adsorbability coal body heat injection gas treatment method

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Embodiment 1

[0029] Embodiment 1 is basically as attached Figure 1-Figure 2 Shown: low-permeability strong adsorption coal body heat injection gas control method, including early drainage, mid-term drainage and post-drainage;

[0030] The operation of extraction in the early stage is: put heat injection holes 21 and extraction holes 22 on the coal body, combine Figure 6-Figure 7 As shown, a row of boreholes can be arranged in a coal seam 20 with a height of 1-3 m, and heat injection holes 21 and extraction holes 22 are arranged alternately. Coal seams 20 with a height of more than 3m can be arranged with multiple rows of holes, and the extraction holes 22 surround the heat injection holes 21 . Install the hole sealer on the heat injection hole 21, the hole sealer in the present embodiment is as Figure 1-2 As shown, the hole sealing device includes a heat injection pipe 1, an extraction pipe 8 and a sealing bag 2, the heat injection pipe 1 is U-shaped, the left end of the heat injectio...

Embodiment 2

[0036] combine Figure 3-Figure 5 As shown, the sealing bag 2 in this embodiment is integrally formed with a protruding part 14, the protruding part 14 communicates with the sealing bag 2, and a card slot is drilled on the inner wall of the heat injection hole 21, and the protruding part 14 is stuck in the card slot.

[0037] The gas injection pipe 3 in this embodiment passes through the sealing bag 2, and the side wall of the gas injection pipe 3 is provided with an air outlet connected with the sealing bag 2, and the right end of the rightmost gas injection pipe 3 is connected with a piston cylinder 15 , the right end of the piston barrel 15 is in an open state, the left end of the piston barrel 15 communicates with the gas injection pipe 3, the piston barrel 15 is sealed and slidably connected with a piston 16, and the left end of the piston barrel 16 is connected with a stage clip 18 between the left end of the piston barrel 15, The left end of the piston 16 is fixedly co...

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Abstract

The invention relates to the field of gas exploitation, in particular to a low-permeability strong-adsorbability coal body heat injection gas treatment method, which comprises early-stage extraction, middle-stage extraction and later-stage extraction; the early-stage extraction operation comprises the steps that: a heat injection hole and an extraction hole are punched in a coal body, a hole packer is installed on the heat injection hole, and a heat injection pipe and an extraction pipe are arranged on the hole packer; heat is injected into the heat injection hole through the heat injection pipe, and gas discharged from the heat injection hole is extracted through the extraction pipe; the middle-stage extraction operation comprises the steps that: along with the prolonging of the heat injection time, desorbed gas enters the extraction hole through coal cracks, and the gas in the extraction holes is extracted at the moment; the later-stage extraction operation comprises the steps that: after the gas concentration and flow in the extraction hole are reduced to a certain degree, it can be considered that a later-stage extraction stage is entered, heat injection into the heat injection hole is stopped, and gas extraction is stopped. According to the scheme, gas in the low-permeability and high-adsorbability coal body is extracted; the extraction efficiency is improved; and the extraction time is shortened.

Description

technical field [0001] The invention relates to the field of gas mining, in particular to a method for controlling gas by injecting heat into a low-permeability and strong-adsorption coal body. Background technique [0002] Coal seam gas pre-extraction is one of the fundamental measures to solve coal mine gas accidents. The gas in the coal body is mainly in the adsorbed state and the free state. The transformation of the adsorbed gas into the free gas is mainly controlled by two factors: coal reservoir pressure and temperature. At present, most of the coal mines in my country adopt the method of pre-extracting gas by reducing the pressure of coal reservoirs due to the mature technology. For the gas control of low-permeability coal seams, since the free state of gas is less, most of the gas exists in the state of adsorption. No matter how hard you work on the reservoir pressure, the amount of gas extracted is always limited. In this way, the gas extraction time for low-permea...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21F17/00E21B33/138
CPCE21F7/00E21F17/00E21B33/138
Inventor 王广宏徐彬赵坤李守瑞汪长明陈亮欧聪何明川张劲松李向往赵华军陶冬刘建华周中强李文王志辉于宝种黄森林王正帅张志刚张冲王建军
Owner CHINA COAL TECH ENG GRP CHONGQING RES INST
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