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6 000 mg/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111 643.71 mg/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1#防膨...

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 exploitation.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 CaCl2 with the total mineral concentration of 111 643.71 mg/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.