海上低渗透油藏新型复合调驱提高采收率技术研究  

Study on New Composite Profile Control and Flooding EOR Technology in Offshore Low Permeability Reservoirs

作　　者：杜娟 DU Juan(CNOOC LTD.Tianjin,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《当代化工》2022年第4期766-769,共4页Contemporary Chemical Industry

基　　金：国家自然科学基金面上项目(项目编号:51805781)。

摘　　要：为了进一步提高海上低渗透油藏水驱开发后的采收率,将聚合物微球和表面活性剂相结合,研究了一种新型复合调驱技术,并对其驱油效果进行了评价。结果表明:聚合物微球CQ-2具有良好的膨胀性能和封堵性能,推荐其最佳注入质量浓度为3000mg·L^(-1),最佳注入量为0.5PV,其对岩心的封堵率可以达到98%以上。表面活性剂SN-5具有良好的界面活性和驱油效果,推荐其最佳注入质量浓度为2 000 mg·L^(-1),最佳注入量为0.5 PV。聚合物微球和表面活性剂复合调驱体系具有良好的配伍性和驱油效果,使用目标区块储层段天然岩心水驱后,继续注入复合调驱体系,可使采收率继续提高26.0%。In order to further improve the oil recovery after water flooding in offshore low permeability reservoirs, a new composite profile control and flooding technology was developed by combining polymer microspheres and surfactants, and its oil displacement effect was evaluated. The results show that the polymer microsphere CQ-2 has good expansion performance and plugging performance. It is recommended that the optimal injection mass concentration is 3 000 mg·L^(-1), the optimal injection volume is 0.5 PV, and the plugging rate of the core is more than 98%. Surfactant SN-5 has good interfacial activity and oil displacement effect. It is recommended that the optimal injection mass concentration is 2 000 mg·L^(-1)and the optimal injection amount is 0.5 PV. The composite profile control and flooding system of polymer microspheres and surfactants has good compatibility and oil displacement effect. After the water flooding of the natural core from the reservoir section of the target block, through the composite profile control and flooding, the oil recovery can be increased by 26.0%.

关 键 词：海上油田 聚合物微球 表面活性剂 复合调驱 提高采收率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]