高效驱油用表面活性剂室内实验研究

Laboratory Study for Surfactant Used for Efficient Flooding

王小勇 刘 宁 杨全安 李宁军 周 佩 董 俊

WANG Xiao-Yong，LIU Ning，LI Ning-Jun，YANG Quan-An，ZHOU Pei，DONG Jun

通过单因素实验，得到重烷基苯磺酸钠（A1）、异丙醇（CH-2）、异构十醇聚氧乙烯醚（F-2）、Gemini表面活性剂（GL-2）的最佳质量比为3:6:2:2的表面活性剂体系 CQBH-1，并进行了配伍性、吸附性和驱替实验。CQBH-1的价格比市场销售的油田常用表面活性剂平均低20％以上。结果表明，在质量分数0.3%~0.5%下，CQBH-1溶液与长庆某油田模拟原油间的界面张力为5×10－3～8×10－3 mN/m。在常压、60℃下，CQBH-1与长庆某油田注入水、地层水和原油均有良好的配伍性，且具有较好的抗吸附性能，质量分数为0.3%~0.5%的CQBH-1溶液静态吸附后与模拟原油间的界面张力仍能达超低数量级。岩心驱替实验表明，注入0.3 PV质量分数为0.5%的CQBH-1表面活性剂溶液，渗透率为1.1×10-3～100×10-3 μm2人造岩心在平均水驱采收率56.70％的基础上可平均提高采收率10.48%。

According to single factor experiments, the surfactant system CQBH-1 was obtained by compounding heavy alkyl benzene sulfonic acid sodium (A1) with isopropanol (CH-2), Isomeric alcohol ethoxylates (F-2) and Gemini surfactant (GL-2) in mass ratio of 3:6:2:2, the price of which is lower than commonly used surfactants in oil field by more than 20%. The compatibility, adsorption and displacement experiments were conducted. The results showed that the interfacial tension between CQBH-1 solution with mass fraction 0.3%~0.5% and the simulated crude oil of Changqing oilfield was 5×10-3—8×10-3 mN/m. CQBH-1 had good compatibility with Changqing oilfield injected water, formation water and simulation crude oil in normal pressure and at the temperature of 60℃, and had good resistance to adsorption. After static adsorption, the interfacial tension between CQBH-1 solution with mass fraction of 0.3%—0.5% and the simulated oil could reach super-low interfacial tension. Core displacement experiments showed that on the basis of water flooding of average oil recovery of 56.70%, the oil recovery of the artificial cores with permeability of 1.1×10-3—100×10-3 μm2 could be enhanced by 10.48% through injecting 0.3 PV of CQBH-1 surfactant solutions.