苏北盆地海安凹陷红1井区防膨注水开发实验研究

在注水油田开发过程中，防止注水引起储层黏土膨胀是非常重要的。苏北油区红1井区储层岩石的水敏指数为0．43，临界矿化度为6000mg／L，表现为中等偏强水敏，储层能量不足，油层压力低，地层水型为CaCl2，总矿化度111643．71mg／L。文章结合拟注入的清水，研究了三种防膨剂在不同温度下的防膨率，其中l#防膨剂使用浓度为1．5％时其防膨率达到88％，在现场得到应用。

Experiment research on anti-swelling agent in water injection exploitation in Hong 1 Well Area

To prevent the reservoir clay swelling which caused by water injection was essential in the process of water injection exploita- tion. According to the study on reservoir bed rocks of Hong 1 well area in Subei Basin, the water sensitive index is 0.43 and critical mineral salt concentration is 6 000 mg/L, it assumed as follows： medium-high water sensitivity, shortage of energe in reservoir bed, low pressure in oil measures, the formation water of Hong 1 formation is CaC12 with the total mineral concentration of 111 643.71 rag/ L. Combined with proposed injection of sweeping fluid, the anti-swelling rate among three types of anti-swelling agents under different temperatures was studied. It suggested that while the concentration of 1# anti-swelling agent was 1.5%, the anti-swelling rate could be up to 88% , so 1# anti-swelling agent was used in Hong 1 well area .