塔河油田碳酸盐岩缝洞型油藏气水复合驱技术

Gas-Water Composite Flooding Technology for Fractured and Vuggy Carbonate Reservoirs in Tahe Oilfield

张伟 海刚 张莹

ZHANG Wei HAI Gang ZHANG Ying

中国石化西北油田分公司采油一厂，新疆轮台 841600

The First Oil Plant of Tahe Oilfield, Northwest Oilfield Branch, Sinopec,Luntai, Xinjiang, 841600, China

塔河油田碳酸盐岩缝洞型油藏经水驱在高部位形成了大量的“阁楼油”，而用氮气驱替“阁楼油”时，由于横向驱动作用弱，在井间富集了大量剩余油。为此，根据塔河油田碳酸盐岩缝洞型油藏储层特征及剩余油分布特征，进行了气水复合驱技术研究。在利用物理模拟试验分析气水复合驱油机理的基础上，根据剩余油分布特征，构建了气水复合驱开发模式；根据井间连通通道的特征，设计了开发井网；利用历史水驱数据和累计注气量，设计了气水复合驱参数。塔河油田4区7个注采井组应用了气水复合驱技术，井组产油量平均增加80.0 t。这表明，气水复合驱中的气驱首先将“阁楼油”驱替到水驱通道，水驱提供横向驱动力再将其驱出，从而提高了剩余油的动用程度。

After water flooding, a large amount of “attic oil” will be left in the structural top of fractured and vuggy carbonate reservoirs in the Tahe Oilfield. Due to weak lateral drives, a large amount of remaining oil will be accumulated between wells even with nitrogen flooding. According to the reservoir characteristics and remaining oil distribution features of such reservoirs, a gas-water composite flooding technology was studied. Based on the analysis of gas-water composite flooding mechanisms, different gas-water composite flooding development modes have been established according to the distribution features of remaining oil. Based on the characteristics of inter-well communication pathways, the development well pattern was designed taking into consideration the unique conditions, and gas-water composite flooding parameters were designed from historical water flooding data and the cumulative gas injection volume. The gas-water composite flooding technology was applied in 7 injection-production well group of Block 4 of the Tahe Oilfield, and the oil production of this well group was increased by 80.0 tons on average. The results indicate that gas flooding in the gas-water composite flooding drives the “attic oil” to the water flooding channel first, and then the water flooding provides lateral driving force to transport it out.

国家科技重大专项“塔里木盆地碳酸盐岩油气田提高采收率关键技术示范工程”（编号：2016ZX05053）部分研究内容

https://doi.org/10.11911/syztjs.2019124