Dual-porosity model of rate transient analysis for horizontal well in tight gas reservoirs with consideration of threshold pressure gradient

作     者：曹丽娜 李晓平 张芨强 罗诚 谭晓华 Li-na Cao;Xiao-ping Li;Ji-qiang Zhang;Cheng Luo;Xiao-hua Tan

作者机构：China ZhenHua Oil Co. Ltd. Beijing 100031 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500 China CNOOC Zhanjiang Co. Ltd. Zhanjiang 524057 China Geological Exploration and Development Research Institute of CNPC Chuanqing Drilling Engineering Ltd. Chengdu 610056 China 

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

年 卷 期：2018年第30卷第5期

页      面：872-881页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0820[工学-石油与天然气工程] 0810[工学-信息与通信工程] 082001[工学-油气井工程] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 081001[工学-通信与信息系统] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Project supported by the National Key Basic Research Development Program of China(973 Program Grant No.2014CB239205) 

主　　题：Rate transient analysis horizontal well dual-porosity threshold pressure gradient tight gas reservoirs 

摘      要：Most researches of the threshold pressure gradient in tight gas reservoirs are experimental and mainly focus on the transient pressure response, without paying much attention to the transient rate decline. This paper establishes a dual-porosity rate transient decline model for the horizontal well with consideration of the threshold pressure gradient, which represents the non-Darcy flow in a fracture system. The solution is obtained by employing the Laplace transform and the orthogonal transform. The bi-logarithmic type curves of the dimensionless production rate and derivative are plotted by the Stehfest numerical inversion method. Seven different flow regimes are identified and the effects of the influence factors such as the threshold pressure gradient, the elastic storativity ratio, and the cross flow coefficient are discussed. The presented research could interpret the production behavior more accurately and effectively for tight gas reservoirs.