普通稠油SP二元复合驱波及系数与驱油效率的关系

改变甜菜碱表面活性剂的质量分数建立具有相同黏度不同界面张力的二元复合驱油体系,通过填砂管驱替实验评价驱油体系提高胜利普通稠油采收率的能力。结果表明,二元体系提高采收率的幅度随着表面活性剂质量分数的增大而减小;添加少量(质量分数0.01%)的表面活性剂,能够降低界面张力,但是高于超低界面张力值(10-3 mN/m),二元复合体系的采收率获得较大的提高,聚合物与表面活性剂产生良好的协同效应。微观驱替实验表明,扩大波及系数能更为有效地提高普通稠油化学驱采收率。降低界面张力至超低值能够提高洗油效率,但会降低复合体系扩大波及系数的能力,从而影响采收率的提高。

The Relationship of Sweep Efficiency and Displacement Efficiency of SP Binary Combination Flooding Systems for Heavy Oil

The binary combination flooding systems with the same viscosity and different interfacial tension were formulated by changing the concentration of betaine surfactants .The sandpack flooding tests were employed to evaluate the ability of flooding systems to enhance the heavy oil recovery .It is found that the recovery decreased with the increasing of the betaine concentration .Low concentration （0 .01% ） of betaine can reduce the IFT to a value above ultra-low value （10-3 mN/m） and the recovery of binary combination flooding system can be greatly improved .There exists a synergy effect between HPAM and surfactant .The microscopic flooding tests show that the improvement of sweep efficiency can increase heavy oil recovery more efficiently .The ultra-low value IFT leads to the increasing of displacement efficiency ,however the sweep efficiency was impaired .As a result ,the improvement of recovery was affected .