Changes in Adsorption Swelling Properties and Dynamic Permeability of Coals under Triaxial Confining Pressure

详细信息   

• 责任者：Zhang Songhang (School of Energy and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Tang Shuheng
• 刊名：Geological Journal of China Universities
• 出版年：2012
• 卷期：18(3)
• 关键词：煤层气 ; coalbed gas ; 沁水盆地 ; Qinshui Basin
• 页码：p.539-543
• 图表：2 illus., 2 tables, 15 refs.
• 分类号：1003
• issnNo：ISSN1006-7493
• isbnNo：CN32-1440/P

摘要

Dynamic changes of the porosity and permeability of coal reservoirs during the coalbed methane （CBM） drainage is one of the hot topics in the research of CBM developmental geology. Stress and strain effects of an anthracite sample from the Jincheng area was investigated under triaxial stress conditions and the dynamic permeability of the sample was discussed. The results showed that the compressive strength of the sample increased significantly after methane adsorption under confining pressure. Correlation of the maximum radial strain to pore pressure of the sample can be described by the form of the Langmuir’s function.