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Method for quickly determining gas content of coal seam according to desorption rate

A coal seam gas and gas content technology, which is applied to the analysis of materials, sampling devices, instruments, etc., can solve the problems of the applicability of the desorption model, and achieve the effects of avoiding gas content measurement errors, convenient methods, and simple equipment

Active Publication Date: 2018-08-28
HENAN POLYTECHNIC UNIV
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Problems solved by technology

This method is limited by the calculation of the gas loss from the desorption model, which is affected by the applicability of the desorption model, and requires professional equipment for residual measurement

Method used

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Embodiment Construction

[0029] In order to make those skilled in the art understand the production process and technical effects of the present invention in detail, the application and technical effects of the present invention will be further introduced below with specific production examples.

[0030] Step 1: On-Site Sampling

[0031] Borehole sampling is carried out at the location where the gas content of the coal seam needs to be measured, and the timing starts when the borehole reaches the coal seam. Put it into a coal sample tank with a pressure gauge after weighing, and the quality of the coal sample is 220g. Then conduct an on-site desorption test, and record the time at this time as 5 minutes.

[0032] Step 2: On-site desorption test

[0033] Measure and record the gas desorption amount of coal samples in the period of 5min to 15min on site 0.13m 3 / t.

[0034] Step 3: Desorption rate measurement

[0035] The coal sample tank was placed in a constant temperature water bath at 30°C fo...

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Abstract

The invention discloses a method for quickly determining the gas content of coal seam according to a desorption rate. The method comprises the following steps: a, on-site sampling; b, on-site desorption test; c, desorption rate determination; d, calculation of the content of gas available for desorption; e, calculation of the content of original gas in a coal sample. The method can be used for accurately and conveniently obtaining the original gas content of coal seam, avoids the gas content measurement error caused by estimation error of a desorption model, does not need residual amount measurement, is implemented with simple equipment and is more convenient. In the same geological unit, under the identical conditions of the coal seam sample damage and industrial analysis, the desorptionrate under adsorption equilibrium pressure p1 does not need to be measured repeatedly, and the measurement is more convenient.

Description

technical field [0001] The invention belongs to the theoretical and applied technical field of coal mine gas control, coal bed gas resource exploration and mining, and in particular relates to a method for rapidly determining coal bed gas content through desorption rate. Background technique [0002] The main test methods for coal seam gas content are direct measurement method and indirect measurement method. Among them, the indirect measurement method is to use the relationship between the gas content and other parameters to calculate the gas content. The most commonly used method is to use the gas content formula and the measured gas pressure to calculate, but the gas pressure measurement cycle is long, and the measurement accuracy has always been a problem. Most direct measurement methods use borehole sampling to divide the gas content into three parts: gas loss during sampling, on-site desorption and residual gas. This method is limited by the calculation of the gas lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/16G01N1/08
CPCG01N1/08G01N7/16
Inventor 安丰华陈向军袁宇袁军伟王林王立国陈立伟陈海栋
Owner HENAN POLYTECHNIC UNIV
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