苏北盆地海安凹陷红1井区防膨注水开发实验研究

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

尹先清 于宝石 孙芳 曹红英 彭丰卫 寇显富 罗觉生

YIN Xianqing YU Baoshi SUN Fang CAO Hongying PENG Fengwei KOU Xianfu LUO Juesheng

长江大学, 湖北荆州 434023; 中国石油浙江油田公司, 浙江杭州 310023; 北京中油石油技术有限公司, 北京 100083

Yangtze University, Jingzhou Hubei 434023, China; Zhejiang Oilfield Company of CNPC, Hangzhou Zhejiang 310023, China; Beijing China Petroleum Technology Ltd., Beijing 100083, China

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 000mg/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111 643.71mg/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1#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。

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 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.

https://doi.org/10.3969/j.issn.1008-2336.2011.04.077