caa a22 4500 445300507 CHVBK 20180317142556.0 cr unu---uuuuu 170323e20100401xx s 000 0 eng 10.1007/s11430-010-0027-x doi (NATIONALLICENCE)springer-10.1007/s11430-010-0027-x Desorption-diffusion model and lost gas quantity estimation of coalbed methane from coal core under drilling fluid medium [Elektronische Daten] [ZhaoBiao Yang, Yong Qin, ZhaoFeng Wang, Geoff Wang, CaiFang Wu] The differences of coalbed methane (CBM) desorption-diffusion from coal drilling-core under various drilling fluid medium are not considered in the present calculating methods of lost CBM quantity, which leads possibly to the inaccuracy of CBM quantity in coal seam. Here we took the desorption of CBM from coal core under drilling fluid medium as a pressure-swing process, and based on the Langmuir equation and Fick-first law, established the desorption-diffusion model and numerical modeling method of lost gas (including free CBM) calculation in coal core under various drilling fluid mediums through physical simulation test and by considering comprehensively primary factors. The results showed that the physical simulated t-Qt curves can be rightly fitted by the numerical modeling data, which indicated the ultimate desorption quantity from the numerical modeling was adjacent to that from the physical simulation as a whole. It was found that the lost CBM quantity from the modeling method was generally higher than that from the direct method when lost time was relatively long. Thus, we suggest that it is necessary to emend the active China national standard through further investigation, since the lost CBM quantity from coal drilling-core was generally underestimated using the method in the current standard. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 drilling fluid nationallicence CBM nationallicence lost gas quantity nationallicence desorption-diffusion model nationallicence numerical modeling method nationallicence Yang ZhaoBiao School of Mineral Resources and Geoscience, China University of Mining & Technology, 221008, Xuzhou, China aut Qin Yong School of Mineral Resources and Geoscience, China University of Mining & Technology, 221008, Xuzhou, China aut Wang ZhaoFeng Safety College, Henan Polytechnic University, 454000, Jiaozuo, China aut Wang Geoff School of Engineering, University of Queensland, 4072, ST Lucia, QLD, Australia aut Wu CaiFang School of Mineral Resources and Geoscience, China University of Mining & Technology, 221008, Xuzhou, China aut Science China Earth Sciences SP Science China Press 53/4(2010-04-01), 626-632 1674-7313 53:4<626 2010 53 11430 https://doi.org/10.1007/s11430-010-0027-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-0027-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang ZhaoBiao School of Mineral Resources and Geoscience, China University of Mining & Technology, 221008, Xuzhou, China aut NATIONALLICENCE 700 1- Qin Yong School of Mineral Resources and Geoscience, China University of Mining & Technology, 221008, Xuzhou, China aut NATIONALLICENCE 700 1- Wang ZhaoFeng Safety College, Henan Polytechnic University, 454000, Jiaozuo, China aut NATIONALLICENCE 700 1- Wang Geoff School of Engineering, University of Queensland, 4072, ST Lucia, QLD, Australia aut NATIONALLICENCE 700 1- Wu CaiFang School of Mineral Resources and Geoscience, China University of Mining & Technology, 221008, Xuzhou, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/4(2010-04-01), 626-632 1674-7313 53:4<626 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer