NUMERICAL SIMULATION OF GAS-WATER LEAKAGE FLOW IN A TWO LAYERED COALBED SYSTEM

作     者：ZHANG Xian-min TONG Deng-ke XUE Li-li ZHANG Xian-min School of Petroleum Engineering, China University of Petroleum, Dongying 257061, China TONG Deng-ke, XUE Li-li School of Mathematics and Computational Sciences, China University of Petroleum, Dongying 257061, China

作者机构：School of Petroleum Engineering China University of Petroleum Dongying 257061 China School of Mathematics and Computational Sciences China University of Petroleum Dongying 257061 China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2009年第21卷第5期

页      面：692-698页

核心收录：

学科分类：12[管理学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 081201[工学-计算机系统结构] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National High Technology Research and Development Program of China (863 Program,Grant No.2006AA06Z236) the National Basic Research Program of China (973 Program,Grant No.2009CB219606) the National Natural Science Foundation of China (Grant No.40974056) 

主　　题：coalbed methane leakage flow two layered coalbed system numerical simulation 

摘      要：For a two layered coalbed system in possession of the slightly permeable interlayer, a mathematical model was established to describe the methane and water flows between coal seams and the internal migration and the distribution of fluids in a slightly permeable interlayer. Meanwhile, this model has included the potential effect of matrix shrinkage associated with desorption on the coal permeability. The numerical results were obtained by the finite difference method, and then the production forecasts for the two layered coalbed system were conducted in combination with the geological data of a certain area in the Qinshui Basin. Through analyzing the internal migration and distribution of fluids in the slightly permeable interlayer and its effect on the coalbed methane well production, the results indicate that the prediction of the gas production rate and the cumulative gas production will be higher if the permeability of the interlayer is neglected. Furthermore, it is also found that the matrix shrinkage could produce an effect on the coal permeability, thus affecting the production performance.