聚合物驱油机理和应用

利用研制的聚合物驱模拟器对纵向非均质、油水粘度比、润湿性、流变性、重力、转注时间、扩散、不能进入的孔隙体积、聚合物的增粘、吸附、降低渗透率能力等进行了模拟研究,得到了一些新认识。对某些条件非常不利的反韵律油层,聚合物驱可能不提高甚至降低采收率;油湿比水湿对聚合物驱有利是有条件的;在一定范围内,非均质系数愈大对聚合物驱是否愈有利而取决于非均质类型;影响聚合物驱最重要的因素是油藏非均质程度与类型、油水粘度比、润湿性、聚合物性能;地层温度和地层水盐浓度不高,中等原油粘度和平均渗透率较大的适度非均质正韵律油湿油藏是聚合物驱的理想油藏;注采速度对反韵律油层的影响比正韵律油层要大。

MECHANISM AND APPLICATION OF POLYMER FLOODING

With a new polymer flooding simulator,simulation studies under various conditions arecarried out to study the effect of various factors(such as:the oil-water viscosity ratio,typeand degree of reservoir heterogeneity,wettability,oil density,polymer adsorption,permeability reduction,inaccessible PV,dispersion and injection rate,etc.)A lot of interesting conclu-sions are drawn. For example,polymer flooding cannot necessarily enhance oil recovery,evenif mobility ratio is unfavourable,Oil-wet is not always a factor more favourable to the polymer flooding. For a vertically reverse rhythmic reservoir,in certain case,the less the hetero-geneity,the more favourable the polymer flooding.