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

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%数0.9%的SKDAS与安塞油田原油的最终界面张力维持在10-3m N/m数量级。在矿化度为10数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10-3m N/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%数0.5%SKDAS溶液在油砂中的吸附量为0.11数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%数12.84%,能满足安塞油田表面活性剂驱油的要求。

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）m N/m order of magnitude. The interfacial tension of 0.5% SKDAS could reach 10^（-3）m N/m order of magnitude when the salinity was 1×10~4—9×10~4mg/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.