Abstract

An experimental study which aimed to analyze the pressure drop when the oil-water two-phase flow mixed with surfactant flows through porous medias was introduced. Porous media with the quartz sands mainly ranging from 0.2–1.2 mm and the oil-water two-phase system with Liaohe crude oil and water were prepared. Surfactant compounded with petroleum sulfonate (PS-30) and dodecyl dimethyl Betaine (BS-12) was used to improve the fluidity of oil-water mixture. The interfacial tension, viscosity and contact angle of the oil-water-surfactant mixture were tested. Then the pressure drop experiments were conducted, which considered three influence factors including the standard deviation of the granularity, the concentration of the surfactant and the ratio of oil to water. Forchheimer resistance model was used to fit the results, and the influence of three factors on the viscous resistance coefficient α⁻¹ and inertial resistance coefficient C₂ were discussed. The results indicated that the compound mixture PS-30/BS-12 is significantly better than other surfactants in terms of pressure drop, and the appropriate concentration of the surfactant is 0.3%. Pressure drop of the mixture can be well fitted by Forchheimer resistance model but α⁻¹ and C₂ still needed to be adjusted by test.

摘要

介绍了一项旨在分析混有表面活性剂的油水两相流流过多孔介质时压降的实验研究。制备了以0.2~1.2 mm石英砂为主的多孔介质和以辽河原油和水为主要成分的油水两相体系。表面活性剂与石油磺酸盐(PS-30)和十二烷基二甲基甜菜碱(BS-12)复配用于改善油水混合物的流动性。测试了油-水-表面活性剂混合物的界面张力、粘度和接触角。然后进行了压降实验，其中考虑了粒度标准偏差、表面活性剂浓度和油水比三个影响因素。Forchheimer电阻模型用于拟合结果，讨论了α ^-1和惯性阻力系数C _{2 。}结果表明，复配混合物PS-30/BS-12在压降方面明显优于其他表面活性剂，表面活性剂的适宜浓度为0.3%。Forchheimer阻力模型可以很好地拟合混合物的压降，但α ^-1和C ₂仍需要通过试验进行调整。