表面活性剂对油湿性致密砂岩渗吸作用与界面协同效应  

Spontaneous imbibition and interface synergistic effect of surfactants on oil-wet tight sandstone

作　　者：王业飞[1,2] 张楚晗 崔佳[3] 丁名臣[1,2] 王海波[3] 陈凯[3] WANG Yefei;ZHANG Chuhan;CUI Jia;DING Mingchen;WANG Haibo;CHEN Kai(State Key Laboratory of Deep Oil and Gas(China University of Petroleum(East China)),Qingdao 266580,China;School of Petroleum Engineering in China University of Petroleum(East China),Qingdao 266580,China;Petroleum Exploration&Production Research Institute,SINOPEC,Beijing 100083,China)

机构地区：[1]深层油气全国重点实验室(中国石油大学(华东)),山东青岛266580 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中国石化石油勘探开发研究院,北京100083

出　　处：《中国石油大学学报（自然科学版）》2024年第5期129-137,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家重点研发计划政府间国际科技创新合作重点专项(2021YFE0107000);国家自然科学基金面上项目(52074339);山东省自然科学基金面上项目(ZR201911080151)。

摘　　要：为探索不同表面活性剂对油湿性致密储层的渗吸排油效果,系统对比阴离子、非离子、阳离子和两性离子4大类型17种表面活性剂渗吸排油效率,分析不同类型活性剂对致密储层渗吸排驱效果的差异及其机制,开发致密储层高效排驱的表面活性剂配方,确立致密储层高效排驱对表面活性剂界面张力和接触角性能的界限。结果表明:试验条件下阴离子、非离子表面活性剂对致密岩心的渗吸排油效率在18.4%~27.2%,显著高于阳离子、两性离子表面活性剂的0~2.4%;阳离子和两性离子表面活性剂不适宜单独作为油湿性致密储层的渗吸排油剂;润湿性调控能力是表面活性剂产生高效渗吸排油的主要原因,界面张力和接触角存在协同效应;复合渗吸排油剂渗吸排油效率超过38%;表面活性剂对致密储层高效渗吸排油的接触角和界面张力分别为15°~35°、0.1~2 mN·m^(-1),对应的N^(-1)B大于15,毛管力是渗吸排油的主要动力。In order to explore the ability of different surfactants to improve the oil displacement effect by imbibition of oil-wet tight reservoirs,the oil displacement efficiency by imbibition of 17 surfactants in four categories including anionic,non-ionic,cationic,and amphoteric were systematically compared.The differences and mechanism of different types of surfactants on imbibition and oil displacement of tight reservoirs were analyzed.The surfactant formulations for high efficiency displacement of tight reservoirs were developed,and the boundaries of interfacial tension(IFT)and contact angle(CA)properties for high oil-displacement efficiency of tight reservoirs were established.The results show that the oil displacement efficiency by imbibition of anionic and non-ionic surfactants for tight core is 18.4%~27.2%under the current experimental condition,which is significantly higher than 0~2.4%of cationic and amphoteric surfactants.The cationic or amphoteric surfactants alone are not suitable as agents for oil displacement by imbibition in oil-wet tight reservoirs.The ability to regulate wettability is the main reason for the efficient oil displacement by imbibition of surfactants,and there is a synergistic effect between IFT and CA.The efficiency of oil displacement reaches over 38%by imbibition for"composite imbibition oil displacement agent".The CA and IFT of surfactants for efficient oil displacement by imbibition from tight reservoirs are 15°~35°,0.1~2 mN·m^(-1),respectively.And the corresponding N^(-1)B is over 15,indicating that capillary force is the main driving force for imbibition under such conditions.

关 键 词：致密砂岩 表面活性剂 渗吸 界面张力 润湿反转 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]