Unsteady inter-porosity flow modeling for a multiple media reservoir |
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| Authors: | Ren-Shi Nie Ying-Feng Meng Yong-Lu Jia Jian-Lin Shang Yong Wang Jian-Guo Li |
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| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan Province, China
2. Petrochina Xinjiang Oilfield Company, Karamay, China
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| Abstract: | The paper deals with unsteady inter-porosity flow modeling of underground fluid in a multiple media reservoir. Assuming spherical
vugs, symmetrically distributed pressure, negligible inter-porosity flow between matrix and vug systems and centrifugal flow
of the fluid from matrix blocks or vugs to fractures, and treating media directly connected with wellbore as the fracture
system, we establish and solve a model of unsteady inter-porosity flow for dual and triple porosity media reservoirs. We provide
simulated graphs of pressure and pressure derivative log-log type curves, and analyze the transient flow process and characteristics
of type curves affected by different parameters. The new type curves of unsteady inter-porosity flow modeling are evidently
different in shape and characteristics from those of pseudo-steady inter-porosity flow modeling. The location of dimensionless
pressure of unsteady inter-porosity is lower than that of pseudo-steady inter-porosity, which indicates that unsteady inter-porosity
flow accelerates an energy supplement during production. Qualitatively, the unsteady inter-porosity flow modeling reduces
the classical V-shaped response. We also estimated parameters from well test data in real applications using this model. |
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