水驱油高倍驱替实验驱油效率计算新方法

A new method for calculating oil displacement efficiency of high water flooding displacement experiment

鲁瑞彬 胡琳 刘双琪 王雯娟 汤明光

中海石油（中国）有限公司湛江分公司，广东 湛江 524057

Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, China)

针对常规驱替实验难以真实模拟油藏开发实际的问题，开展了水驱油高倍驱替实验研究。联合应用红外测油仪和蒸馏法（2种方法相互补充验证），解决了高倍驱替出油量难以计量的问题，并设计针对性实验，证明了这一方法的准确性；利用面通量指标，对比分析了驱替实验和油藏开发实际中冲刷强度、驱替速度上的差异，为驱替实验设计提供了强有力的支撑；同时获得了较强冲刷强度下储层物性和面通量的定量关系式，应用到数值模拟中，可研究剩余油分布规律，指导油藏开发调整。文中形成的高倍驱替驱油效率计算方法在南海西部油田应用效果较好。

Aiming at the problem that the conventional displacement experiment is difficult to simulate the actual development of the reservoir, the experimental study on high displacement of water flooding oil was carried out. In this study, infrared oil detector and distillation method(two methods complement each other) were used to solve the problem of difficult measurement of high displacement oil volume. The accuracy of this method has been proved by designing pertinent experiments. By using surface flux index, the differences of scouring intensity and displacement speed between displacement experiment and reservoir development practice were compared and analyzed, which provided a strong support for displacement experiment design. At the same time, the quantitative relationship between reservoir physical properties and areal flux under strong scouring intensity was obtained, which can be applied to numerical simulation to study remaining oil distribution law and guide reservoir development adjustment. The calculation method of oil displacement efficiency for high displacement experimental is better in the western oil field of South China Sea.

10.6056/dkyqt201905012