摘要
针对渤海A油田长期注水开发后油藏平面及纵向上水驱开发不平衡、含水率上升加快、剩余油分散富集、储层非均质性进一步加大等问题,采取调剖调驱措施来改善水驱开发效果。以渤海A油田储层特征为模拟对象,提出使用合成初始黏度低、成胶强度高且具有优秀的注入能力以及耐温耐盐性能的乳液聚合物为调剖剂,利用红外光谱仪、黏度计等测试其组分结构及成胶时间、耐温耐盐等性能,采用环氧树脂浇筑岩心等实验手段开展了注入、封堵效果研究。结果表明:在油藏温度65℃下,质量浓度7500 mg·L^(-1)乳液聚合物+5000 mg·L^(-1)交联剂复配形成的乳液凝胶调剖体系,成胶时间为7d,成胶强度为G级,脱水率低于3.8%;该乳液调剖体系具有较好的耐温性、抗盐性,耐温可达100℃,抗盐可达30000 mg·L^(-1)。岩心流动实验结果表明,乳液凝胶体系的注入性和封堵性良好,封堵率可达92%。
In view of the problems such as unbalanced water drive development in Bohai A Oilfield after long-term water flood development in the horizontal and vertical directions of the reservoir,accelerated water cut rise,dispersed and enriched remaining oil,and further increased reservoir heterogeneity,profile control and flooding measures must be taken to improve water drive development effect.Taking the reservoir characteristics of Bohai A oilfield as the simulation object,it was proposed to use synthetic emulsion polymers with low initial viscosity,high gelling strength,excellent injection ability,temperature resistance and salt resistance as profile control agents.Scanning electron microscopy,infrared spectrometer and other means were used to test their component structure,gelling time,temperature resistance and shear resistance.Experimental methods of epoxy resin pouring cores and sand-filled pipes were used to carry out research on the injection,plugging and self-selection control effects.At a reservoir temperature of 65℃,the emulsion gel profile control system with formula of 7500 mg·L^(-1) emulsion polymer+5000 mg·L^(-1) crosslinker had the gelling time of 7 d,the gelling strength reached G level,and the dehydration rate was less than 3.8%.The emulsion profile control system had good temperature resistance,salt resistance and shear resistance.The temperature resistance reached 100℃and the salt resistance reached 30000 mg·L^(-1).The core flow experimental results showed that the emulsion gel system had good injectability and plugging performance,and the plugging rate reached 92%.
作者
刘义刚
刘长龙
鲍文博
赵鹏
李彦阅
边永胜
王芮芮
董宏超
单云飞
LIU Yigang;LIU Changlong;BAO Wenbo;ZHAO Peng;LI Yanyue;BIAN Yongsheng;WANG Ruirui;DONG Hongchao;SHAN Yunfei(CNOOC(China)Co.,Ltd.Tianjin Branch,Tianjin 300452,China;National Key Laboratory for Efficient Development of Offshore Oil and Gas,Beijing 102209,China;Key Laboratory of Enhanced Oil Recovery,Northeast Petroleum University,Daqing Heilongjiang 163318,China)
出处
《当代化工》
2025年第11期2652-2656,共5页
Contemporary Chemical Industry
基金
中国海洋石油有限公司“十四五”重大科研项目(项目编号:KJGG2021-0502)
海南省科技专项揭榜挂帅项目(项目编号:ZDYF2024GXJS263)
海南省科技创新联合项目(项目编号:ZDYF2024GXJS294)
教育部“春晖计划”国际合作科研项目(项目编号:HZKY20220311)
黑龙江省自然科学基金项目(项目编号:LH2022E021)。
关键词
乳液
聚合物
红外光谱
凝胶强度
耐温耐盐性
多孔介质
封堵性
Emulsion
Polymer
Infrared spectroscopy
Gel strength
Temperature and salt resistance
Porous medium
Plugging property
