以克拉玛依油田七东₁区下克拉玛依组砾岩储集层为研究对象,通过室内实验研究了物性、岩性、孔隙结构模态与聚合物驱提高采出程度的关系。通过核磁共振技术,建立了聚合物原油动用规律研究的实验方法,分析了砾岩油藏储集层聚合物驱过程中微观孔隙的动用规律。通过微观驱油实验,分析了砾岩油藏聚合物驱后各类剩余油的采出情况。研究表明,聚合驱主要驱替簇状剩余油、孤岛状剩余油,聚合物驱后孤岛状剩余油占总剩余油的比例最大;聚合物驱的过程中,由于砾岩复杂的孔隙结构及聚合物溶液的高黏特性,大油滴被剪切为小油滴,并部分被聚合物溶液拖拽出孔隙。聚合物驱提高采收率程度与岩心孔隙度、渗透率等之间的相关性不明显,与储集层的岩性、孔隙结构有关。不同岩性聚合物驱提高采收率幅度由大到小次序为:含砾粗砂岩>砂砾岩>不等粒小砾岩>细小砾岩;聚合物提高采收率程度与可动油饱和度呈现出二次抛物线关系。

Taking the conglomerate reservoir of the Lower Karamay Formation in Qidong-1 area of Karamay Oilfield as the research object, the relation between physical properties, lithology and pore structure modes and the degree of recovery of polymer flooding is studied by laboratory experiments. And by means of nuclear magnetic resonance（NMR） technology, the experimental method of the study on the kinetics of polymer crude oil utilization is established and the kinetics of micro-porosity in the polymer flooding process of conglomerate reservoirs is analyzed. Through the micro-displacement experiments, the residuals after polymer flooding in conglomerate reservoirs are analyzed. The results show that the polymer flooding mainly displaces the cluster-like residual oil and the island-like residual oil. The polymer-driven residual oil accounts for the largest proportion of the total remaining oil. During the polymer flooding process, due to the complex pore structure of conglomerate and high viscosity of polymer solution, the large oil droplets are sheared into small oil droplets, and partially of which are dragged out of the pores by the polymer solution. The correlation between the degree of enhanced oil recovery by polymer flooding and core porosity and permeability is not obvious, however, it is related to the lithology and pore structure of the reservoir. The order of enhanced oil recovery with different lithologic polymer flooding from coarse to small is: boulder coarse sandstone>glutenite>unequal grain small conglomerate>fine conglomerate. There is a quadratic parabola relation between the degree of polymer recovery and dynamic oil saturation.