C油田开发37 a后,采出程度40%,综合含水率90%,稳产难度极大。为针对性地制定挖潜措施保障油田高效开发,开展了基于C油田地质油藏特征的三维可视化物理模型实验和油藏数值模拟研究,二者相互验证。对剩余油分布规律及影响因素分析研究的结果表明:边水主要沿储层底部推进,经过长时间驱替后,油藏类型由边水油藏逐渐转变为次生底水油藏,生产井井点处水锥严重,在井间及储层顶部剩余油富集;渗透率级差越大、地层倾角越小、原油黏度越高,水锥现象越明显。根据研究成果,在C油田实施了定向井井间水平井加密调整工作,取得较好挖潜效果,研究成果对于类似油田双高阶段剩余油挖潜具有较好的指导作用。

After 37 years of development, the recovery degree of C oilfield has reached 40% and the comprehensive water cut has reached 90%. It is very difficult to stabilize production. In order to formulate potential tapping measures to ensure efficient oilfield development, three-dimensional visual physical model experiment and reservoir numerical simulation based on geological reservoir characteristics of C Oilfield were carried out. The physical simulation and numerical simulation were verified against each other and the influencing factors of remaining oil were analyzed and studied. The results show that the edge water mainly invades along the bottom of the reservoir. After long-term displacement, the reservoir type gradually changes from edge water reservoir to secondary bottom water reservoir. The water cone at the well points of production wells is serious, and the remaining oil is enriched between wells and at the top of the reservoir. The greater the permeability level difference, the smaller the formation dip angle and the higher the crude oil viscosity, the more obvious the water cone phenomenon. According to the research results, the infill adjustment of horizontal wells between directional wells has been implemented in the C oilfield, and good potential tapping effect has been achieved. The research in this paper provides guidance for tapping the potential of remaining oil in similar oilfields at the double high stage.