Method and equipment for checking sealing quality of gas extraction drilled holes
A gas extraction and sealing technology, which can be used in the liquid/vacuum measurement for liquid tightness and the measurement of the fluid's acceleration and deceleration rate.
Active Publication Date: 2014-11-05
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0004] The purpose of the present invention overcomes the deficiencies in the prior art, provides a method and equipment for quickly testing the sealing of gas drainage boreholes with simple method and compact equipment, and solves the problem of difficult inspection of the sealing quality of gas drainage boreholes in coal mines
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Embodiment Construction
[0017] Below in conjunction with accompanying drawing, the example of the present invention will be further described:
[0018] The specific method for testing the sealing performance of gas drainage boreholes of the present invention: arrange gas drainage boreholes 12 in underground coal mines where gas drainage is required, and seal the gas drainage boreholes 12 to form gas drainage boreholes. Sealing section 10 of gas extraction borehole 12 to prevent gas leakage. The compressed air system 1 passes through the first control valve 2, the pipeline 3 provided with the first pressure gauge 4, the second control valve 5, the flow meter 6, the tee pipe 7 and the second pressure gauge 9, and the sealed gas pump. The extraction pipe 11 in the drilling hole 12 is connected, and the three-way pipe 7 is provided with an exhaust valve 8 . Close the second control valve 5 and the exhaust valve 8, open the first control valve 2, make the reading of the first pressure gauge 4 within the ...
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The invention relates to a method and equipment for checking the sealing quality of gas extraction drilled holes, and belongs to a method and equipment for checking the sealing quality of drilled holes. A compressed air system is connected with an extraction tube in a sealed gas extraction drilled hole via gas extraction drilled hole checking equipment, and fills gas with the initial pressure of 0.2MPa-0.4MPa and the initial flow not smaller than 20m<3> / h into the gas extraction drilled hole via the gas extraction drilled hole checking equipment and the extraction tube, and when stable duration of reading of a flowmeter and a second pressure gauge is not shorter than 2 minutes, gas entering the gas extraction drilled hole and gas exiting from the gas extraction drilled hole are balanced dynamically, namely, the pressure difference between the inside and the outside of a sealed section of the drilled hole is determined. If a reading value of the second pressure gauge is larger than or equal to 0.05MPa, sealing of the gas extraction drilled hole is qualified. The method and the equipment are simple, the time of checking the sealing quality of one gas extraction drilled hole is only 10-15 minutes, and the method and the equipment are convenient to operate, are fast and efficient, do not damage the sealing structure of the drilled hole, and have wide practicality.
Description
technical field [0001] The invention relates to a method and equipment for testing the tightness of boreholes, in particular to a method and equipment for testing the tightness of gas drainage boreholes. Background technique [0002] The sealing quality of gas drainage borehole is the key to ensure the effect of gas drainage. At present, there are still some problems in the sealing quality of drainage boreholes in our country, and the lack of effective inspection methods is one of the important reasons. The sealing quality of the drainage borehole is judged by the gas concentration during the extraction process, that is, the rate at which the gas concentration decays is judged. Generally, the gas concentration needs to be continuously observed for about 30 days. The inspection period is long, and it is an after-the-fact judgment. It is difficult to improve the borehole sealing in time quality or method. After about 30 days of observation, if it is found that the sealing qu...
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IPC IPC(8): G01M3/26
Inventor 周福宝高峰王圣程刘春刘应科
Owner CHINA UNIV OF MINING & TECH