胜利油区海上油田二元复合驱体系性能评价

Study on performance of offshore polymer-surfactant system in Shengli oilfield

通过流变性、界面张力、吸附、老化、驱油等实验研究了适合胜利油区海上油田条件下的二元复合驱体系的性能,结果表明该体系具有良好的抗温、抗盐、抗剪切性及老化稳定性,表面活性剂在较大浓度范围内使油水界面张力达到10^(-3)mN/m。物理模拟研究表明,二元复合驱体系在多孔介质中具有良好的注入性能,在1152.3×10^(-3)μm的孔隙介质中具有较高的阻力系数和残余阻力系数,分别为504.2和102.7,大幅度降低了水测渗透率,且有效地扩大了波及体积。驱油实验结果表明该体系具有良好的驱油能力,能使胜利油区海上原油采收率提高24%以上。

Based on the rheology,surface tension,adsorption,aging and oil displacement experiment,the performance of surfactant -polymer system suitable for the offshore oilfield of Shengli area is studied and proposed.The study presents that this system is of good temperature,salinity,shearing and aging performance,and the surfactant may enhance the oil/water surface tension by 10^(-3) mN/m in a wide range of concentration.The experiment of injecting binary flooding system into the porous media shows that it has a good performance.In 1 152.3×10^(-3)μm porous media,it has high resistance factor and residual resistance factor,504.2 and 102.7,therefore,it significantly reduces the water measured permeability and enlarges the water sweeping efficiency.The system has good oil displacement capacity,and can increase the recovery factor by 23%in Shengli offshore oilfield.It has a good application prospect.