乙醇胺-石油磺酸盐二元复合驱油体系

Binary Combination Flooding System of Ethanolamine/Petroleum Sulfonate

王增宝 白英睿 赵修太 唐金玉

WANG Zengbao BAI Yingrui ZHAO Xiutai TANG Jinyu

以油水界面张力作为性能评价指标，优选了有机碱乙醇胺（MEA）与表面活性石油磺酸盐（SLPS）的最佳复配体系：0.30% MEA +0.30%SLPS，对优选的MEA/SLPS二元复合驱油体系的界面活性、抗盐性能、耐温性能、乳化性能及驱油性能进行了评价，并与常用的无机碱/表面活性剂（NaOH/SLPS）二元复合驱油体系的性能进行对比。结果表明，有机碱MEA与无机碱NaOH和表面活性剂SLPS 的复配体系相比，降低油水界面张力的能力相差不大，均可达到10-3mN/m以下，但有机碱与表面活性剂的二元复配体系可以在更短时间内将油水界面张力降至最低；与NaOH/SLPS 体系相比，MEA/SLPS 体系的抗盐性能、乳化性能及驱油性能都更加突出，耐盐可达30000 mg/L，提高采收率可达13.2%，但耐温性能略差，仅为70℃。在一定温度范围内，有机碱可替代无机强碱作为今后油田化学驱油用碱，并会取的更好的驱油效果。图7 表2 参17

With the oil-water interfacial tension as the property evaluation index, the binary combination flooding composed of organic alkali ethanolamine（MEA）and petroleum sulfonatewas optimized as follows, 0.30% SLPS+0.30% MEA. On this basis, the interfacial ability, salt resistance, temperature resistance, emulsification and oil displacing properties of the optimized binary combination flooding MEA/SLPS system was evaluated by comparing that of common used binary combination flooding system——inorganic alkali/surfactants（NaOH/SLPS）system.The experimental results showed that there was no large difference with respect to the ability of reducing oil-water interfacial tension between the MEA/SLPS system and that of NaOH/SLPS system, both could make the interfacial tension be below of 10-3 mN/m, however, with MEA/SLPS system, the oil-water interfacial tension could be reduced to the lowest value within shorter time than that with the NaOH/SLPS system. The MEA/SLPS system was better in the aspects of salt resistance, emulsification and oil-displacing ability, the salt resistance being up to 30000 mg/L，the enhanced oil recovery being up to 13.2%, except for its worse ability of temperature resistance, being only 70℃.Within certain temperature range, organic alkali could substitute inorganic alkali used as some kind of chemical flooding alkali in the future with better effect of oil displacement.