超低界面张力体系驱油方式与微观驱油效果

为了探索超低界面张力体系的驱油方式及其微观驱油效果,利用玻璃刻蚀的透明微观仿真孔隙模型,进行了2种模型、4种驱油方式共6个方案的BS13甜菜碱型表面活性剂及其与聚合物复配二元体系的微观驱油室内实验,并采用图像分析技术研究了不同驱油方式及其微观驱油效果.结果表明:在均质和非均质模型中,BS13甜菜碱型超低界面张力活性水都易于在水驱已形成的渗流通道中突进,使驱替效果变差,单纯用超低界面张力活性水段塞进行驱替,不能有效地提高采收率;超低界面张力二元复合体系能够有效地防止其沿水驱形成的渗流通道向前突进,具有较好的驱替效果;欲获得较高的采收率,不仅要尽量降低驱油体系与原油间的界面张力,而且要适当增加驱油体系的黏度.

The research on displacement ways and microscopic displacement effects of ultralow interfacial tension system

In order to explore the displacement ways and microscopic displacement effects of the ultra-low interfacial tension system, the use of transparent glass-etched micro-pore model simulation carried out two kinds of models, four kinds of displacement ways, a total of six microscopic displacement programs in the lab with BS13 betaine-type surfactants and their compound binary systems with polymer, and discussed the different displacement methods and their micro-displacement effects by using image analysis technology. The results showed that: In the homogeneous and non-homogeneous models, BS13 betaine ultra-low interfacial tension activated water was easy to rush in the seepage channels formed by waterflooding, so that the displacement effects became bad, so simply using ultra-low interfacial tension activated-water slug to drive oil can not have good effects on enhanced oil recovery; while the binary composite system of ultra-low interfacial tension can effectively prevent interfacial tension activated water from rushing along the seepage channels formed by waterflooding, with good results for driving; For higher recovery, not only to minimize interfacial tension between displacement system and the crude oil, but also to appropriately increase the viscosity of oil displacement system.