安塞油田表面活性剂驱油体系室内研究

Surfactant Oil Displacement System Research of Ansai Oilfield

杨剑 黄战卫 董小丽 刘玉梅

YANG Jian HUANG Zhanwei DONG Xiaoli LIU Yumei

考察了阴离子-非离子型表面活性剂体系SKDAS的界面张力、乳化能力、吸附性能、配伍性能、降压增注能力，并进行了室内驱油实验。结果表明，0.1%～0.9%的SKDAS 与安塞油田原油的最终界面张力维持在10-3mN/m数量级。在矿化度为10～90 g/L 时，0.5%的SKDAS矿化水溶液与原油之间的界面张力均在10-3 mN/m数量级，耐盐性较好。其对原油具有较强的乳化能力，且加量越大，乳化能力越强。0.1%～0.5% SKDAS溶液在油砂中的吸附量为0.11～0.14 mg/g。SKDAS和安塞油田清水、采出水配伍性良好。当SKDAS质量分数由0.3%增至0.7%时，可在水驱基础上提高采收率10.41%～12.84%，能满足安塞油田表面活性剂驱油的要求。图4表7参14

Through the study on interfacial tension，emulsifying ability，adsorptive property，compatibility，decompression and augmented injection capacity，and oil displacement experiment，the performance of anionic-nonionic surfactant（named SKDAS） was evaluated. The results showed that the final interfacial tension between，0.1%—0.9% SKDAS and the oil of Ansai oilfield maintained to 10-3 mN/m order of magnitude. The interfacial tension of 0.5% SKDAS could reach 10-3 mN/m order of magnitude when the salinity was 1×104—9×104 mg/L，showing good salinity tolerance. SKDAS had strong emulsifying ability for crude oil. The higher concentration，the better emulsifying property was. The adsorption capacity of SKDAS solution in oil sands was 0.11— 0.14 mg/g when the mass fraction of SKDAS was 0.1%—0.5%。The compatibility between SKDAS and clear water or produced water of Ansai oilfield was good. When the mass fraction of SKDAS increased from 0.3% to 0.7%，SKDAS flooding could improve the oil recovery 10.41% —12.84% based on water flooding system，which could satisfy the requirement of surfactant oil displacement in Ansai oilfield.