仿真微模型及其在油藏工程中的应用

本文介绍在储油层真实孔隙系统中驱油机理的直观研究结果。作者采用光化学刻蚀工艺,以天然岩心切片的真实孔隙系统,在平面玻璃上制成二维透明的仿真微模型。模型具有储油层孔隙结构的基本特征。润湿性从强亲水到强亲油可随意调节;孔隙表面的粗糙度可控。模型可再生而多次重复使用。利用该模型,进行了二次和三次采油驱油机理的试验研究,观察了真实油层复杂孔隙系统中水驱油的过程,残余油的形成及分布特征等。对驱油过程作了录像,并对试验结果进行了讨论。

MICROMODEL SIMULATION AND ITS APPLICATION IN RESERVOIR ENGINEERING

A two-dimensional, transparent micromodel was prepared according to a micrograph of thin section of a reservoir rock sample by means of the photochemical etching technique. The micromodels exhibts the main features of the pore stucture in an actual reservoir rock. The wettability of this model can be regulated optionaly from strongly water-wet to strongly oil-wet. The roughness of the pore surfaces can be controlled also. The micromodel also can be washed and renewed for subsequent use. The micromodel is used to study the mechanism of oil displacement in second and tertiary oil recovery process and these can be observed visually. The formation of the residual oil and their distribution are studied accordingly A video recording of related phenomena has been carried out and the results of laboratory stu-ies are presented and discussed.