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Medium-hard coal seam bedding drill hole gas treatment method

A technology of bedding drilling and coal seam, which is applied in the field of gas control of bedding drilling in medium-hard coal seams. It can solve the problems of large gas drainage engineering, small drilling radius, and small coal seam disturbance, and achieve gas drainage. The effect of increasing the radius, shortening the extraction time, and speeding up the extraction

Active Publication Date: 2019-05-14
HUNAN UNIV OF SCI & TECH +1
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Problems solved by technology

[0013] The invention provides a method for controlling the gas in the middle-hard coal seam along the bedding borehole, which solves the problem that the existing single gas control method has little disturbance to the coal seam, the drilling radius is small, the gas drainage engineering quantity is large and the gas extraction time is long technical issues

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  • Medium-hard coal seam bedding drill hole gas treatment method
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Embodiment Construction

[0038] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered below.

[0039] figure 1 It is a schematic flow chart of the gas control method for bed-by-bed drilling in medium-hard coal seams according to a preferred embodiment of the present invention.

[0040] Such as figure 1 As shown, the method for controlling the gas in the middle-hard coal seam along the bedding of the present embodiment includes the following steps:

[0041] S1. Drilling and coring along the direction of the coal seam in the mining face, measure the average f value of the coal seam, and preliminarily determine the hydraulic slotting process parameters according to the average f value. The hydraulic slotting process parameters mainly include selecting the high pressure pump model , kerf nozzle size, kerf width, where f is the firmness coefficient of coal;

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Abstract

The invention discloses a medium-hard coal seam bedding drill hole gas treatment method. The method comprises the following steps: measuring an average f value of a coal seam by coring, determining hydraulic slotting process parameters, determining an extraction radius r1 after hydraulic slotting in the coal seam, determining an extraction radius r2 after hydraulic slotting and liquid CO2 phase change fracturing, rearranging drill holes according to the numerical value of r2, performing hydraulic slotting and liquid CO2 phase change fracturing, sealing the holes, conducting connection with anunderground extraction system, and performing extraction effect inspection. According to the method, firstly, a seam along the direction of a coal seam is directionally cut by utilizing a hydraulic slotting technology, pressure relief disturbance is conducted on the coal seam, then high-pressure gas generated after liquid CO2 phase change is used for directional cracking along the seam, and therefore the cracking effect can be effectively improved, coal seam gas extraction is accelerated, the gas treatment time is shortened, and safe production of a working face is guaranteed.

Description

technical field [0001] The invention relates to the technical field of coal mine gas control, and in particular, relates to a method for controlling gas in bed-by-bed drilling in medium-hard coal seams. Background technique [0002] Coal is the main energy source in our country, and it will still maintain its status as the main energy source for a long period of time. Restricted by the conditions of coal resource occurrence, my country's coal resources mainly come from underground mining. With the continuous increase of coal seam burial depth and mining intensity, coal mine gas has become a major disaster that threatens coal mining. Most of the major coal mine accidents in our country in recent years are caused by gas accidents. Although the funds and personnel invested in gas control in mines are increasing, the threat of gas disasters still exists. [0003] Once a gas accident occurs, it is often accompanied by mass deaths and injuries, causing heavy losses to enterpris...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26
Inventor 赵鹏涛王海桥魏佳男徐东方马合意覃佐亚陈滔
Owner HUNAN UNIV OF SCI & TECH
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