致密油藏水驱可动用性研究

Research on availability of water flooding in tight oil reservoir

周义博 刘卫东 孙灵辉 丛苏男 严玉忠 李阳4

中国科学院大学工程科学学院，北京100190 中国科学院渗流流体力学研究所，河北 廊坊 065007 中国石油勘探开发研究院廊坊院区，河北 廊坊 065007 中国石油勘探开发研究院，北京 100083

School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100190, China Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China Langfang Branch of Research Institute of Petroleum Exploration & Development, PetroChina, Langfang 065007, China Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

针对致密储层有效动用困难的现状，文中通过岩心离心实验、水驱油实验，并结合核磁共振检测技术，对致密岩心孔隙内流体的赋存状态及可动用性进行了研究。研究表明：孔喉半径大于0.05 ?滋m致密储层中的流体在一定条件下可以得到不同程度动用；在不同驱动力下，亚微米孔喉中流体变化幅度大于微米级和纳米级孔喉，0.10 ?滋m≤r<0.50 ?滋m的孔喉是致密储层中流体主要富集与流通空间，对储层可动流体贡献最大，是水驱的主要动用对象，具有较大的开发潜力。

Aiming at the development situation that the tight sandstone reservoir cannot be utilized effectively, the fluid state and the availability of fluid at different levels in the tight sandstone reservoir are studied by nuclear magnetic resonance, centrifuge experiments and conventional oil displacement experiments. The results show that the fluid in the tight sandstone reservoir with pore space radius greater than 0.05 ?滋m can be utilized under certain conditions. In different driving forces, the decrease of fluid in submicron pore throat is larger than that of micron and nanometer pores. The micron pore with radius in 0.10￣0.50 ?滋m is the main reservoir and circulation space of fluid in the tight reservoir, which contributes the most to the movable fluid of the reservoir. The pore is the main object of water flooding, and has great potential for development.

10.6056/dkyqt201902023