压驱用不对称双子型表面活性剂的制备与复配及性能评价  

Preparation and performance evaluation of asymmetric Gemini surfactant for fracturing-flooding

作　　者：周柄男 丁秋炜 吴婧 张昕 张宇 滕大勇 ZHOU Bingnan;DING Qiuwei;WU Jing;ZHANG Xin;ZHANG Yu;TENG Dayong(CNOOC Energy Development Co.,Ltd.,Engineering Technology Branch,Tianjin 300450,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300450

出　　处：《石油化工》2024年第12期1779-1786,共8页Petrochemical Technology

基　　金：中海油能源发展股份有限公司重大专项基金项目(HFKJ-ZX-GJ-2023-02)。

摘　　要：压驱注水技术主要通过表面活性剂分子吸附机理改变油水界面张力和润湿性,驱动孔喉中残余油滴提高产量。针对低渗高温及高矿化度储层,以芥酸酰胺丙基羟磺基甜菜碱、十八烷基羟丙基磺基甜菜碱和1,4-二溴丁烷为原料制备不对称双子型表面活性剂QYJ-1,再与聚氧乙烯醚表面活性剂等复配得到压驱用驱油剂,配套优选减阻剂和黏土稳定剂组成滑溜水压驱液体系。通过结构表征及室内实验评价了此驱油剂的润湿性能、界面张力、乳化率和驱油效率。实验结果表明,0.30%(w)驱油剂渤海海水溶液油水界面张力可达2.390×10^(-3)mN/m,在150℃老化240 h后,界面张力仍可达10-3 mN/m级别,对亲油性岩心接触角改变值超过50°,润湿效果和驱油效率较好,且乳化率适中,各项性能指标能够满足现场应用需求。The fracturing-flooding injection technology changes the interfacial tension and wettability of oil and water through the adsorption mechanism of surfactant molecules,driving residual oil droplets in the pore throat to increase oil production.For low-permeability,high-temperature,and high-salinity reservoirs,asymmetric Gemini surfactants were prepared using erucamide propyl hydroxysulfobetaine,octadecyl hydroxypropyl sulfobetaine,and 1,4-dibromobutane as raw materials.These surfactants were then compounded with polyoxyethylene ether surfactants to obtain an oil-displacement agent,which was further optimized with drag reducers and clay stabilizers to form a smooth hydraulic flooding fluid system.The wetting performance,interfacial tension,emulsification rate,and oil displacement efficiency of this oil-displacement agent were evaluated through structural characterization and indoor experiments.The results show that the oil-water interfacial tension of the 0.30%(w)oil-displacement agent Bohai seawater solution can reach 2.390×10^(-3)mN/m.After aging at 150℃for 240 h,the interfacial tension can still reach the level of 10^(-3)mN/m.The change in the contact angle of oleophilic cores exceeds 50°,the wetting effect and oil displacement efficiency are good,and the emulsification rate is moderate.All performance indicators can meet the needs of on-site applications.

关 键 词：压驱 双子型表面活性剂 界面张力 润湿性改变 驱油剂 低渗油藏 

分 类 号：TQ423[化学工程]