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Physical experiments and numerical simulations of viscosity reducer flooding for ordinary heavy oil
Journal of Petroleum Science and Engineering ( IF 5.168 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.petrol.2020.107194
Zupeng Liu , Guanghuan Wu , Chaoping Wei

In order to overcome disadvantages of thermal recovery technologies such as high cost and air pollution, chemical flooding for ordinary heavy oil by viscosity reducer flooding was studied. The EOR mechanisms of viscosity reducer flooding to improve heavy oil recovery were studied by physical experiments and numerical simulation methods. First, the performance of the viscosity reducer was evaluated, then the injection characteristics and oil displacement performance were studied through core oil displacement experiments, the mechanism of oil recovery improvement by the viscosity reducer was studied through microscopic visualization experiments, and finally a comparison was made between indoor physical experimental results and numerical simulations. The results showed that the process of viscosity reducer flooding can form a stable oil-in-water emulsion. The process of water flooding can be divided into three stages: the starting pressure breakthrough stage, the rapid pressure decline stage, and the low pressure operation stage. Viscosity reducer flooding reduced the starting pressure gradient and the displacement pressure, while the oil recovery factor was increased by 12.4%, and the total recovery reached 46.6%. The main mechanism of improving oil recovery by a viscosity reducer is to reduce the crude oil viscosity and the residual oil saturation. By using the nonlinear mixing rule, the variation rule of crude oil viscosity with the viscosity reducer concentration was obtained, which can be directly applied to reservoir numerical simulations. A pilot test showed that the water cut was decreased and oil production was increased, which also reduced the injection pressure and gave all the production wells improved oil production.



中文翻译:

普通稠油降粘剂驱油的物理实验与数值模拟

为了克服热回收技术的高成本和空气污染等缺点,研究了通过减粘剂驱替普通重油进行化学驱。通过物理实验和数值模拟方法研究了减粘剂驱提高稠油采收率的EOR机理。首先,对减粘剂的性能进行了评估,然后通过岩心驱油实验研究了注入特性和驱油性能,并通过微观可视化实验研究了由减粘剂提高采油率的机理,最后进行了比较。室内物理实验结果和数值模拟之间的关系。结果表明,降粘剂驱油过程可以形成稳定的水包油型乳液。注水过程可分为三个阶段:启动压力突破阶段,快速压力下降阶段和低压运行阶段。降粘剂驱降低了起始压力梯度和驱替压力,而采油率提高了12.4%,总采收率达到了46.6%。通过减粘剂提高采油率的主要机理是降低原油粘度和剩余油饱和度。利用非线性混合规律,得到了原油粘度随降粘剂浓度的变化规律,可直接用于油藏数值模拟。

更新日期:2020-03-20
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