a novel pressure transient response model considering multiple migration mechanisms in shale gas reservoir论文.pdf

Journal of Natural Gas Science and Engineering 22 (2015) 321 e334 Contents lists available at ScienceDirect Journal of Natural Gas Science and Engineering journal homepage: /locate/jngse A novel pressure transient response model considering multiple migration mechanisms in shale gas reservoir Feifei Chen a, *, Yonggang Duan a, Kun Wang b, Xiaodong Li b, Yi Liao b a State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan Province, PR China b Research Institute of Shenzhen Branch of CNOOC Ltd, Guangzhou 510240, PR China a r t i c l e i n f o a b s t r a c t Article history: Since the shale gas production data predicted by traditional simulators is far below that of field test, Received 9 October 2014 reservoir volume parameters are often modified to meet the fitting demands. Most pressure transient Received in revised form models of reservoir, merely based on Darcy flow in the matrix and natural fractures, neglect the 12 December 2014 comprehensive influences of viscous flow, slip flow, transition flow and Knudsen flow, etc. In this paper, Accepted 13 December 2014 Available online 20 December 2014 two gas apparent permeability models considering multiple migration mechanisms are established through theoretical derivation and fitting. The models are applicable to various flow states and will help to simplify percolation mod