两性双子表面活性驱油剂的制备及其性能  

Preparation and properties of amphoteric Gemini surfactant oil displacement agent

作　　者：张利伟 谢虎 赵田 宋翼 熊启勇 郑存川[3] ZHANG Li-wei;XIE Hu;ZHAO Tian;SONG Yi;XIONG Qi-yong;ZHENG Cun-chuan(China Petroleum Xinjiang Oilfield Branch Engineering Technology Research Institute,Karamay 834000,China;No.1 Gas Production Plant of Xinjiang Oilfield Branch of PetroChina,Karamay 834000,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000 [2]中国石油新疆油田分公司采气一厂,新疆量克拉玛依834000 [3]西南石油大学化学化工学院,四川成都610500

出　　处：《化学研究与应用》2024年第6期1268-1276,共9页Chemical Research and Application

基　　金：四川省重点研发项目(2021YFC0112);中国博士后科学基金(No.2018M631100)。

摘　　要：为了有效提高致密油藏渗吸驱油采收率,以脂肪酸甲酯磺酸钠为原料制备了一种两性双子表面活性剂驱油剂,对双子表面活性剂驱油剂进行表征及性能评价,并结合高压压汞和岩心核磁共振技术分析岩心的启动尺寸。结果表明:双子表面活性剂驱油剂具有较高的表界面活性,表面张力最低为27.1mN/m,临界胶束浓度为100ppm左右,当浓度为500ppm时油水界面张力达到超低界面水平;其能够使改性石英片接触角降低至28.2°;渗吸采出程度达到18.64%;在90℃、10×10^(4)ppmNaCl和5×10^(3)ppmCaC_(2),矿化度下均能达到超低界面水平;最大增容粒径可达325.8nm;静态洗油效率最大为67.46%。高压压汞曲线与核磁共振曲线的转换系数C值为857nm/ms,能启动岩心最小孔隙直径为21.7018nm。An amphoteric Gemini surfactant oil displacement agent was prepared from sodium fatty acid methyl ester sulfonate to im-prove the recovery of imbibition oil displacement in tight reservoirs.The Gemini surfactant oil displacement agent was characterized and evaluated,and the starting size of the core was analyzed by high-pressure mercury injection and core nuclear magnetic reso-nance technology.The results show that the Gemini surfactant flooding agent has high surface and interface activity,the minimum surface tension is 27.1 mN/m,the critical micelle concentration is about 100 ppm,and the oil-water interfacial tension reaches the ultra-low interface level when the concentration is 500 ppm.It can reduce the contact angle of the modified quartz sheet to 28.2°;the degree of imbibition recovery reaches 18.64%.At 90℃、10×10^(4)ppmNaCl and 5×10^(3)ppmCaC_(2) salinity can reach ultra-low interface level;the maximum compatibilized particle size can reach 325.8 nm.The maximum static oil washing efficiency is 67.46%.The conversion coefficient C of the high-pressure mercury injection curve and the nuclear magnetic resonance curve is 857 nm/ms,and the minimum pore diameter that can start the core is 21.7018 nm.

关 键 词：两性双子表面活性剂 致密油藏 渗吸驱油 超低界面 

分 类 号：O648.2[理学—物理化学]