高含水后期非均质油藏W/O型表面活性剂调驱实验研究  

Experimental Study on Profile Control and Oil Displacement of W/O Surfactant at Heterogeneous Reservoirs in High Water Cut Later Period

作　　者：蒲万芬[1] 梅子来 辛军 PU Wan-fen;MEI Zi-lai;XIN Jun(State Key Laboratory of Petroleum Reservoir Geology and Development Engineering,Southwest Petroleum University,Chengdu 610500,China;Research Institute of Geological Exploration and Development,CNPC Chuanqing Drilling Engineering Limited Company,Chengdu 610501,China)

机构地区：[1]西南石油大学油气藏地质与开发工程国家重点实验室,成都610500 [2]中国石油川庆钻探工程公司地质勘探开发研究院,成都610051

出　　处：《科学技术与工程》2021年第8期3090-3096,共7页Science Technology and Engineering

基　　金：国家科技重大专项(2017ZX05030-001)。

摘　　要：针对常规低界面张力表面活性剂驱在非均质油藏易发生窜流、调驱效果差等问题,选用具有良好乳化增黏性能的W/O型表面活性剂调驱体系HC-2,促使油水两相在地层发生乳化,形成高黏度W/O型乳状液驱,有效驱替油藏低渗区域的残余油,改善高含水后期非均质油藏的开发效果。室内模拟高含水、非均质油藏条件,对W/O型表面活性剂调驱体系HC-2进行了基本性能评价及乳状液驱油研究。研究结果表明,HC-2的乳化增黏性能良好,在水油比小于7∶3时,可促使油水两相完全乳化形成高黏度的W/O型乳状液,且乳化稳定系数SI均在66%以上;同时在X油藏条件下,HC-2可将油水界面张力降低至10-2 mN/m。岩心驱油实验结果表明,在高含水及高含水后期,W/O型表面活性剂HC-2调驱体系可提高原油采收率23%~28.77%;HC-2调驱体系具有较强的非均质性调控能力,在渗透率级差小于7.5时,可有效地增大驱替相黏度,改善高、低渗层吸液剖面,提高原油采收率。To solve the problems that conventional surfactant with low interfacial tension(IFT)is easy to cause crossflow and result in poor displacement efficiency in heterogeneous reservoirs,the W/O surfactant system HC-2 with tackifying emulsificat ion property was selected,with which the emulsion of oil/water was promoted,to enhance viscosity of displacing phase,to effectively displace residual oil in low permeability area,and to improve the development effect after water flooding in heterogeneous reservoir.The basic performance of W/O surfactant system HC-2 was evaluated and the oil displacement was studied under high water and heterogeneous conditions.Results show that HC-2 has good emulsifying properties,with which oil-water can be emulsified and form high-viscosity emulsions formed when the water to oil ratio is 7∶3.The emulsion stability index is greater than 66%.Meanwhile,HC-2 can reduce the IFT to 10-2 m N/m.The results of emulsion flooding indicate that the recovery factor of W/O surfactant flooding increase by 23%~28.77% under high water cut and extra high water cut.HC-2 system show a good mobility control and strong profile control ability for heterogeneous formation.When the permeability ratio of parallel cores is lower than 7.5,applying HC-2 system can improve injection profile between high permeable core and low permeable core,and enhance the oil recovery.

关 键 词：高含水 乳化增黏 调驱 非均质性 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]