New technology of determining coalbed gas content by reversion seal coring |
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Authors: | Shao-jie Chen Gen-yin Cheng A-meng Xu Xue-xi Chen |
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Affiliation: | 1.School of Safety Engineering,North China Institute of Science and Technology,Beijing,China;2.School of Civil and Environment Engineering,University of Science and Technology Beijing,Beijing,China |
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Abstract: | The key of the direct method of determining coalbed gas content is how to shorten the coal core exposure time in the sampling
progress and reduce measuring error of gas content which comes from the calculation of losing gas content. The coring tests
were carried out in No.24 drilling field of 715 floor gateway in Qinan Coal Mine by using traditional drill core barrel sampler
and self-designed reversion seal coring equipment. The losing gas content was calculated by power functional method, and the
gas content of two coring methods was determined, respectively. Results show that, compared with traditional drill core barrel
sampling, the newly seal coring equipment can significantly shorten the coal core exposure time, the 30 min desorption gas
content increases obviously, the calculation of losing gas content reduces by 56.99%, the desorption gas content in normal
atmosphere increases by 113.24%, and the determining value of gas content increases by 10.06%. The new technology has much
higher accuracy, and it is worthwhile to be popularized. |
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