New technology of determining coalbed gas content by reversion seal coring

作     者：Chen, Shao-jie Cheng, Gen-yin Xu, A-meng Chen, Xue-xi 

作者机构：School of Safety Engineering North China Institute of Science and Technology Beijing China School of Civil and Environment Engineering University of Science and Technology Beijing Beijing China 

出 版 物：《Journal of Coal Science & Engineering(China)》 (煤炭学报（英文版）)

年 卷 期：2012年第18卷第1期

页      面：35-38页

学科分类：02[经济学] 0808[工学-电气工程] 0819[工学-矿业工程] 07[理学] 081903[工学-安全技术及工程] 08[工学] 070103[理学-概率论与数理统计] 0202[经济学-应用经济学] 020208[经济学-统计学] 0818[工学-地质资源与地质工程] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0813[工学-建筑学] 0714[理学-统计学（可授理学、经济学学位）] 0814[工学-土木工程] 0701[理学-数学] 

主　　题：gas content seal coring exposure time losing gas content 

摘      要：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 bar- rel 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 technol- ogy has much higher accuracy, and it is worthwhile to be popularized.