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由于缝洞型油藏储集类型较为复杂,选择流动模型时具有随意性,使得选用的流动模型不合理,不能反映油藏的流动规律。为此,提出了根据储集体类型、特征尺度和组合关系建立流动模型的方法:①按特征尺度和分布密度将储集空间分为连续介质和不连续介质,微小的裂缝、溶洞和基岩中的孔隙为连续介质,大尺度裂缝和大尺度溶洞为不连续介质;②确定连续介质的种类,并分析不同连续介质间的窜流是否具有方向性,从而确定多重介质的介质重数;③大尺度裂缝和溶洞若被充填,运动方程采用达西定律,未被充填则采用Navier-Stokes方程。将该方案用于塔河缝洞型油藏,成功模拟了大尺度裂缝和溶洞内的产水规律。
Due to the complexity of the reservoir type of fractured-cavity reservoirs, the randomness of the selected flow model makes the selected flow model unreasonable and does not reflect the law of reservoir flow. For this reason, a new flow model based on reservoir type, characteristic scale and combination relationship is proposed: ① The reservoir space is divided into continuous medium and discontinuous medium according to the characteristic scale and distribution density, tiny cracks, karst caves and bedrock Of the pores are continuous medium, large-scale cracks and large-scale karst cave are discontinuous medium; ②Determining the types of continuous medium, and analyzing whether the channeling flow between different continuous medium has the directionality to determine the medium weight of multiple medium; ③large Scale cracks and cavities filled with Darcy’s law of motion and Navier-Stokes equations without filling. The scheme is applied to Tahe fracture-cave reservoir, and the law of water production in large-scale fractures and cave is successfully simulated.