Dual Porosity and Dual Permeability Modeling of Horizontal Well in Naturally Fractured Reservoir
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This article is the first investigation on the dual permeability flow issue for horizontal well-production in a naturally fractured dual-porosity reservoir. Based on the inter-porosity flow from matrix system to fracture system and treating the media directly connected with horizontal wellbore as matrix and fracture systems, we established a model of horizontal well-production and then solved the model using some modern mathematical methods, such as Laplace integral transformation, separation of variables, eigenvalue, and eigenfunction. Later in the article, we obtained the standard log–log type curves using numerical simulation and analyzed the transient flow behavior thoroughly, which showed it is dual porosity and dual permeability flow behavior. The numerical simulation results showed that there are obvious differences between dual permeability and single permeability models. The dual permeability flow behavior accelerates energy supplement during production and reduces the classical matrix-fracture (V-shaped) response. We also showed that type curves characteristics are affected by external boundary conditions, the parameter κ, ω f and λ mf, etc. The research results show that our model would be a good semi-analytical model supplied to users. Because the single permeability modeling ignores the direct fluid supply from matrix to wellbore, we recommend using the dual permeability modeling to make well testing and rate decline interpretation in real case studies.
KeywordsNaturally fractured reservoir Horizontal well Modeling Dual permeability Type curves
The authors would like to thank the 4 anonymous reviewers. They thoroughly reviewed the manuscript and their critical comments were very helpful in preparing this article. The authors would like to also thank the editors of TIPM for their managing and editing the article. The authors would like to especially thank Mr Hong-Qiao Jia (an engineer of the company of SPT Group Inc. in Houston, Texas, U.S.A.) for his ardent help in English writing and usage.
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