注采角度变化对驱油效率和微观剩余油的影响

nfluence of injection?鄄production angle variation on oil displacement efficiency and microscopic remaining oil

朱维耀 马启鹏 李兵兵 刘雅静 岳明

北京科技大学土木与资源工程学院，北京 100083

School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China)

为了深入探究油藏条件（60 ℃）下水驱油开发过程中注采角度改变对驱油效率和微观剩余油的影响，文中利用微观可视化渗流物理模拟系统，真实模拟不同注采角度水驱油过程，定量和定性研究了改变注采角度对驱油效率和各类微观剩余油的影响。结果表明：注采角度的改变打破了原始渗流场压力平衡状态，使各类微观剩余油重新被动用，驱油效率显著提高，其中注采角度135°时，驱油效率提高11.69百分点，效果最佳；改变注采角度还可有效改变微观剩余油类型，将大量簇状和柱状剩余油转变为膜状和孤岛状剩余油，从而促进各类微观剩余油的剥离与渗流，大幅提高驱油效率。研究结果为油气田优选注采方向提供了技术支持和理论指导。

In order to further explore the effect of injection angle variation on the oil displacement efficiency and microscopic remaining oil after water flooding at temperature（60 °C）, this paper uses the physical simulation system of microscopic visual seepage flow to realistically simulate different injection?鄄production angle for water flooding. We analyze quantitatively and qualitatively the effect of the injection?鄄production angle variation on the oil displacement efficiency and various types of microscopic remaining oil. The results show that change of injection?鄄production angle breaks the pressure balance state of the original seepage field and makes all kinds of microscopic remaining oil reused, and the oil displacement efficiency is improved. When the injection?鄄production angle is 135°, the oil displacement efficiency is improved by 11.69%, and the oil displacement effect is the best. In addition, changing the injection?鄄production angle can also effectively change the remaining oil type, transforming a large number of clustered and columnar remaining oils into membranes and island remaining oils. The remaining oil promotes the stripping and seepage of all kinds of microscopic remaining oil and greatly increases the oil displacement efficiency. This paper provides some technical support and theoretical guidance to optimize the direction of injection and production in the development of oil and gas fields.

10.6056/dkyqt201902018