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大庆油田已进入特高含水开发中后期,三元复合驱已成为“控水稳油”最具应用前景的提高采收率技术之一。国内外对三元复合体系的性质已做了大量室内研究,尤其是油藏中的乳化对提高采收率所起的作用是近年来研究的焦点,但对于驱替过程中,乳化作用所产生的乳化压差对采出液含水及提高原油采收率的影响分析较少。从室内物理模拟方面,利用实验室自制的弱碱烷基苯磺酸盐表面活性剂,在体系黏度相同,不考虑黏度压差时,与大庆油田目前正在使用的石油磺酸盐表面活性剂三元复合驱驱油体系作对比,考察乳化压差对驱替过程的影响。实验结果表明,两种表面活性剂三元体系均发生乳化,但新型弱碱烷基苯磺酸盐的乳化能力要强于石油磺酸盐,形成的乳化压差更大,驱替过程中稳油控水的能力更强,对采收率的提高更明显。
Daqing Oilfield has entered the late development of ultra-high water-cut, and ASP flooding has become one of the most promising technologies for enhanced oil recovery. At home and abroad, a great deal of studies have been done on the properties of ternary complex systems. In particular, the role of emulsification in oil reservoirs to enhance oil recovery has been the focus of recent research. However, in the process of displacement, The effect of differential pressure of emulsification on recovery of oil in production fluid and improvement of recovery rate of crude oil is less. From the indoor physical simulation, the use of laboratory homemade weak alkyl benzene sulfonate surfactant, the same viscosity in the system, regardless of the viscosity pressure difference, and Daqing Oilfield is currently being used in petroleum sulfonate surfactant tris Yuan composite flooding drive system for comparison, to examine the emulsification pressure on the displacement process. The experimental results show that the emulsification of the ternary system of the two surfactants occurs, but the emulsifying capacity of the new weak alkyl benzene sulfonate is stronger than that of the petroleum sulfonate, forming a larger emulsion pressure difference, stable oil during the displacement Water control ability is stronger, the improvement of oil recovery is more obvious.