Direct rapid measuring method capable of desorbing mash gas content with coal seam

A gas content, rapid determination technology, applied in the preparation of test samples, special data processing applications, instruments, etc., can solve the problems of high measurement cost, production impact, abnormal gas emission, etc.

Active Publication Date: 2008-03-05
CHINA COAL TECH ENG GRP CHONGQING RES INST
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AI Technical Summary

Problems solved by technology

The indirect method to measure the gas content of coal seams is also a commonly used method at present, but the indirect method needs to measure the original gas pressure of the coal seam underground. The measurement process of the original gas pressure of the coal seam is relatively complicated. There are strict technical requirements for the treatment of gas pressure. Regardless of which link is inadvertently handled, the pressure measurement results will be invalid or unreliable. For a specific coal seam, it is impossible to arrange a large number or more measuring points for measurement, and it is impossible to accurately grasp the occurrence of coal seam gas in a large area as a whole; secondly, the indirect method requires certain roadways, drilling and sealing works, and special sealing Pore ​​materials and special sealing equipment, etc., the amount of measurement work is large, and a large amount of laboratory work is required to determine the adsorption constant of coal and industrial analysis, etc., and the measurement cost is relatively high; thirdly, the indirect method has a long measurement cycle, generally It is about 20-45 days, which

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  • Direct rapid measuring method capable of desorbing mash gas content with coal seam
  • Direct rapid measuring method capable of desorbing mash gas content with coal seam
  • Direct rapid measuring method capable of desorbing mash gas content with coal seam

Examples

Experimental program
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Effect test

Embodiment 1

[0083] Embodiment 1: Now take a certain mine of Huainan Mining (Group) Co., Ltd. as an example to illustrate the measurement process. The steps are as follows:

[0084] (1) Underground coal core sampling

[0085] Drilling layout: drilling through layers in a floor lane of the mine;

[0086] Drilling construction: Drilling is carried out vertically to the coal seam, the inclination angle is 66°, the hole diameter is φ75mm, and the drilling is stopped after seeing the coal seam floor at 55m, and the drill pipe is withdrawn.

[0087] Coal core taking: send the φ73mm single-layer core pipe to the bottom of the coal seam under the state of pressurized air, and start drilling. The time to start drilling is recorded as 18:06 on the 24th of a certain month in a certain year. Drill until the coal sample is filled with coal. Up to the sample cylinder, the end time is 18:18 on the same day, and the drilling time is t 1 After 12 minutes, exit the core tube, put the coal core into the co...

Embodiment 2

[0111] Embodiment two: now take Huainan Mining (Group) Co., Ltd. ××× mine as an example to illustrate the measurement process, and its steps are as follows:

[0112] (1) Underground coal core sampling

[0113] Drilling layout: construction of layer-by-layer drilling at the driving face of Huainan ××× mine coal roadway;

[0114] Drilling construction: Drilling is carried out along the direction of the coal seam, with an inclination of +2°, a hole diameter of φ108mm, and a drilling depth of 23m. Entering the original gas pressure zone, stop drilling, withdraw the drill pipe, and start drilling at 9:05 on the 5th of a certain year. ;

[0115] Coal core taking: Send the φ90mm double-layer core pipe to the bottom of the coal seam under the state of pressurized air, and start drilling. The time to start drilling is recorded as 9:46 on the 5th of a certain month in a certain year. Drill until the coal sample is filled with coal. Up to the sample cylinder, the end time is 10:00 on t...

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Abstract

The method comprises: sampling coal core from underground mining; at underground mining, measuring and calculating the gas loss quantity of coal core; at the ground, measuring and calculating the desorption of the coal mining gas; measuring and calculation the grind gas desorption of partial coal core; calculating the content of gas capable of being desorbed.

Description

technical field [0001] The invention relates to a direct and rapid determination method for desorbable gas content in coal seams. Background technique [0002] Coal seam gas is the leading factor causing major gas disasters such as coal and gas outburst, abnormal gas gushing, and gas explosion. Accurately grasping the occurrence and distribution of coal seam gas is the premise of preventing and controlling gas outburst. Therefore, the rapid increase of coal seam gas content Accurate measurements are critical. [0003] Generally, there are two main methods for measuring the original gas content of coal seams, namely indirect method and direct method. The most commonly used indirect measurement method of coal seam gas content at home and abroad is to calculate the coal seam gas content with general formulas based on the field measured coal seam original gas pressure, laboratory measurement of coal adsorption constant and industrial analysis. The indirect method to measure th...

Claims

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Application Information

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IPC IPC(8): G01N7/14G01N1/08G01N1/28G06F19/00
Inventor 胡千庭文光才邹银辉赵旭生张庆华李秋林康建宁吕贵春雷红艳吴教锟冯康武
Owner CHINA COAL TECH ENG GRP CHONGQING RES INST
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