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

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

机构地区：[1]China ZhenHua Oil Co. Ltd., Beijing 100031, China [2]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China [3]CNOOC Zhanjiang Co. Ltd., Zhanjiang 524057, China [4]Geological Exploration and Development Research Institute of CNPC Chuanqing Drilling Engineering Ltd., Chengdu 610056, China

出　　处：《Journal of Hydrodynamics》2018年第5期872-881,共10页水动力学研究与进展B辑（英文版）

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

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.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.

关 键 词：Rate transient analysis horizontal well DUAL-POROSITY threshold pressure gradient tight gas reservoirs 

分 类 号：TE243[石油与天然气工程—油气井工程] TN927.2[电子电信—通信与信息系统]