相对渗透率
水驱
磁导率
含水率
石油工程
地质学
环境科学
多孔性
岩土工程
土壤科学
化学
生物化学
膜
作者
Renyi Cao,Zhihao Jia,Lin Cheng,Zhikai Wang,Tianming Ye,Zhenhua Rui
标识
DOI:10.1016/j.petrol.2022.110629
摘要
Most of the mature oilfields are on the verge of being abandoned. Drilling infill wells or chemical displacement is a standard method to improve mature oilfield performance. But these methods are not economical. For the sustainable and economic development of mature oilfields, large displacement natural water flooding was applied for improving mature oilfield performance. After high-intensity water flooding, most of the mature oilfields are in high water-cut and high recovery stages, and it is difficult for performance prediction. Relative permeability is an important characteristic of multiphase flow in porous media and also an important parameter for dynamic prediction of high water cut stage. In this study, the ratio of the flow-through water flow to the pore area of the displaced cross-section, i.e., the displacement flux (P.A.), was applied to characterize the scouring intensity. Two types of relative permeability curves were obtained through high-intensity water flooding (HIWF) experiments, including one type of continuous relative permeability curve of different displacement fluxes (Type I HIWF relative permeability curve) and the second type of multiple relative permeability curves of different displacement fluxes under re-saturated conditions (Type II HIWF relative permeability curve). In addition, a two-dimensional five-point pattern model was established to compare the calculation results of one conventional type of relative permeability curve and two types of HIWF relative permeability curve. Finally, a numerical model of a real reservoir in a mature oilfield was generated to test the method. The results demonstrate that using Type I HIWF relative permeability curve is fast and accurate to characterize the performance of the ultra-high water cut stag, which guides the application of high-intensity long-term water flooding in order to improving the ultimate oil recovery (IOR). So as to help the mature oilfields achieve economic and sustainable development.
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