不同碱/表面活性剂二元复合驱体系的性能对比

Performance Comparison of Different Alkaline/Surfactant Binary Combination Flooding System

王增宝 赵修太 白英睿 赵敏 李永来 陈文雪

WANG Zengbao，ZHAO Xiutai，BAI Yingrui，ZHAO Min，LI Yonglai，CHENWenxue

分别研究了含有有机碱、无机碱的碱表面活性剂AS二元复合驱体系的降低油水界面张力、耐温抗盐性能、乳化性能、表面活性剂在油砂表面的吸附量、地层水结垢趋势、提高原油采收率及驱油特性的性能。研究结果表明：与单一碱的二元复合驱油体系相比，复合碱的驱油体系可以提高抗盐性能、原油乳化性能及原油采收率幅度；碱的种类影响驱油体系的耐温抗盐性能及乳化性能，含有有机碱的驱油体系的抗盐性能好，抗盐可达50000mg/L，含有无机碱的驱油体系抗温性能及对原油乳化能力好，抗温达90℃，原油脱水率最低（8.5%）；碱的加入可降低石油磺酸盐在油砂表面的最大吸附量，降低量为25%～30%；复合有机碱及复合无机碱的二元复合驱油体系均可以较大幅度提高原油采收率，提高采收率幅度超过18%，但与复合无机碱的驱油体系相比，复合有机碱的驱油体系可以有效减弱地层水的结垢趋势；复合有机碱与复合无机碱/表面活性剂二元复合驱油体系的微观驱油特性不同。图10 表4 参18

A comparative research on the reducing oil-water interfacial tension，temperature tolerance and salt-resisting properties emulsification property，adsorption of the surfactant on oil sand surface，scaling tendency of formation water，the enhanced oil recovery，performance of oil displacement characteristic of alkali/surfactant（AS）binary combination flooding systems，containing organic bases and inorganic bases，respectively，was conducted. The results showed that，compared with binary combination flooding system of single alkali，the flooding system of compound alkalis could improve the performance of salt-resisting property， emulsification property and oil recovery；the type of base affected the temperature tolerance and salt-resisting properties and emulsification property of the system. The system containing organic bases had better salt-resisting property，being up to 50000 mg/L，and the system containing inorganic bases had better temperature-resisting property，being up to 90℃，and better emulsification property，having the lowest crude oil dehydration rate of 8.5%. The addition of bases could decrease the adsorption of mahogany sulfonate on oil sand surface by 25%～30%. The system containing compound organic bases and compound inorganic bases could both greatly enhance oil recovery more than 18%，however，compared with the system containing compound inorganic bases，the system containing compound organic bases could effectively reduce scaling tendency of formation water. The system containing compound organic bases and compound inorganic bases had different microcosmic oil displacement characteristics.