Measuring device for gas permeability of coal rock core

A technology for gas permeability and measuring device, which is applied in measuring device, permeability/surface area analysis, DC flow characteristic measurement, etc. There is no uniform method and standard for effective liquid permeability, so as to achieve the effect of low cost, small experimental error and improved measurement accuracy.

Inactive Publication Date: 2012-05-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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Problems solved by technology

[0003] At present, there is no uniform method and standard for the measurement of gas permeability and equivalent liqui

Method used

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  • Measuring device for gas permeability of coal rock core
  • Measuring device for gas permeability of coal rock core
  • Measuring device for gas permeability of coal rock core

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Experimental program
Comparison scheme
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Embodiment Construction

[0017] The embodiment of the present invention will be described in detail below in conjunction with specific experimental steps. The experimental steps are as follows:

[0018] (1) Measure the diameter and length of the coal rock core with a vernier card;

[0019] (2) Check the airtightness of the device;

[0020] (3) Turn off the high-pressure gas cylinder and precision pressure gauge 6, and vacuumize with a vacuum pump;

[0021] (4) Put the coal rock core into the coal rock holder, apply confining pressure to the core with a hand pump, and the confining pressure should be 0.5 MPa higher than the upstream pressure;

[0022] (5) Open the high-pressure gas cylinder, let the gas enter the core holder after passing through the pressure reducing valve and the buffer container, and the inlet pressure is between 0 and 5 MPa. After the gas flow is stable, record the time it takes for the soap film to pass a certain scale;

[0023] (6) Record the upstream pressure value of precis...

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Abstract

The invention discloses a measuring device for gas permeability of a coal rock core. The measuring device mainly comprises a high-pressure gas source module, a core holder module, a circular pressure loading module, a data metering module and a vacuum treating module, which are connected through needle-type valves (3,5,7,9 and 13), wherein the high-pressure gas source module comprises a high-pressure gas bottle (1), a pressure relief valve (2) and a buffer container (4); the core holder module is a core holder (8); the circular pressure loading module is a hand-operated pump (12); the data metering module comprises precision pressure gauges (6 and 10) and a soap bubble flowmeter (11); and the vacuum treatment module is a vacuum pump (14). The measuring device is convenient to operate, has good repeatability of measured data, small experiment error and low cost, and is suitable for the testing field of gas permeability and equivalent liquid permeability of the coal rock core.

Description

technical field [0001] The invention belongs to the field of testing coal rock core gas permeability, and in particular relates to an ultra-low permeability coal rock core gas permeability measuring device. Background technique [0002] Coalbed methane, commonly known as gas, is a self-generated and self-storage unconventional natural gas mainly composed of methane that is associated with coal in coal mines and adjacent rock formations and occurs in coal seams. Due to the characteristics of low porosity, low permeability, brittleness and strong methane adsorption of coal rock reservoirs, coal rocks and sandstones are very different. , development and capacity forecast are of great significance. [0003] At present, there is no uniform method and standard for the measurement of gas permeability and equivalent liquid permeability of coal rock cores, and testing equipment, technology and methods still need to be developed and improved. The device of the invention adopts a mod...

Claims

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Application Information

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IPC IPC(8): G01N11/08G01N15/08
Inventor 孙仁远张元法林李胡爱梅陈东
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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