Ezperimental study on directional permeability of coal for coalbed methane recovery
This paper presents the experimental measurements of coal permeability to investigate the dynamic and directional features of permeability simulating the conditions of coalbed methane (CBM) and/or CO2enhaced CBM (ECBM) recovery. A specially designed true tri-axial stress coal permeameter (TTSCP) was used in this study, providing experimental information for the directional permeability in three representative coals. Among this information, net confining stress determined by controllable directional stresses in the experiments provides a better understanding of the anisotropic behavior of gas transport in coal. The experimental measurements show that the horizontal permeability anisotropy ratio of coals, defined by the ratio of face cleat to butt cleat permeability, varies in a wide range of up to about 3. 5: 1.This implies that improper design of wellbores without a good understanding of the directional permeability in coal will have a significantly effect on gas production performance. In addition, adsorptive fluid exhibits permeability loss with adsorption and the permeability generally decrease as the confining stress increases.
coal coalbed methane (CBM) CBM recovery permeability anisotropy
G. X. Wang P. Massarotto V. Rudolph C. T. Wei X. H. Fu Y. Qin
School of Chemical Engineering, The University of Queensland, Qld 4072, AUSTRALIA School of Mineral Resources and Geoscience, China University of Mining and Technology, Xuzhou, 22100
国际会议
徐州
英文
170-179
2009-09-24（万方平台首次上网日期，不代表论文的发表时间）