低矿化度水驱提高原油采收率研究进展

Research Progress of Low Salinity Water Flooding for EOR

闫 飚 范洪富 伍国栋

YAN Biao，FAN Hongfu，WU Guodong

低矿化度水驱是指向地层中注入矿化度为1～5 g/L 的水来提高采收率。目前，关于低矿化度水驱提高原油采收率的机理仍存在争议。通过梳理低矿化度水驱技术的发展历程，总结了砂岩油藏低矿化度水驱提高采收率的机理大致可分为微粒运移和润湿性改变两大方面。简述了碳酸盐岩油藏低矿化度水驱提高采收率的机理，主要包括由于矿物溶解引起的双电层的变化和离子反应。浅析了适用低矿化度水驱技术的油藏条件，总结了低矿化度水驱和其他驱油工艺结合的新技术，介绍了分子模拟技术在低矿化度水驱方面的应用，并对未来的发展提出了建议。

Low salinity water flooding means injecting water with salinity of 1—5 g/L into the formation to enhance oil recovery. The mechanism of low salinity water flooding to enhance oil recovery is still controversial. By sorting out the development history of low salinity water flooding technology，the main mechanism of enhanced oil recovery by low salinity water flooding in sandstone reservoir could be roughly divided into two aspects，such as particle migration and wettability change. The mechanism of enhanced oil recovery by low salinity water flooding in carbonate reservoir was briefly described，including the change of double electric layer and ion reaction caused by mineral dissolution. The reservoir condition suitable for low salinity water flooding technology was analyzed. Then the new technology combining low salinity water flooding with other oil flooding technology was summarized. The application of molecular simulation technology in low salinity water flooding was introduced. Finally，some suggestions for future development were put forward.

10.19346/j.cnki.1000-4092.2022.03.029