SPH simulation of oil displacement in cavity-fracture structures |
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Authors: | Guangzheng Zhou Zhihai Chen Wei Ge Jinghai Li |
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Affiliation: | 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3. Petroleum Exploration and Production Institute of Sinopec, Beijing 100083, China |
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Abstract: | This paper presents a study of the immiscible displacement of oil by water in cavity-fracture structures using smoothed particle hydrodynamics (SPH). The surface tension and wetting behavior are incorporated into the equation of motion, and pseudo periodic boundary conditions are applied. As for “middle-fractured” structure, it is found that the ultimate oil recovery is almost determined by the height of fracture regardless of its orientation, and the result compares well with corresponding experiments. Besides, the water-wet wall is favorable to higher oil recovery. A systematic exploration is carried out on “upper-fractured” structure for the feasibility of gravity drainage, where a critical width of fracture is found, beyond which the oil in the cavity can be driven out. The possible development of SPH in this background for large-scale simulation is prospected finally. |
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