物理模拟研究剩余油微观分布

通过微观透明模型研究了注水开发剩余油形成的微观形态,研究了水驱、聚合物驱和弱凝胶调驱等驱油方式下剩余油的形成过程、微观分布规律和影响剩余油分布的主、次要因素。把剩余油分为可动剩余油、条件可动剩余油和不可动剩余油。研究得出,储集层岩石的非均质性是剩余油形成的主要原因。水驱剩余油主要分布在注入水未波及区、亲油岩石表面、死孔隙、狭小孔隙或低渗储集层以及部分堵塞的孔隙中;聚合物驱后的剩余油主要是死孔隙中的不可动油和小孔隙以及吸附在亲油岩石表面的条件可动油;弱凝胶调驱后的剩余油主要是死孔隙中的不可动油和吸附在岩石表面的条件可动油。

A Study on Microdistribution of Residual Oil by Physical Simulation Process

The experiments on micromechanism of forming residual oil have been made by using microtransparent sand-packed model.The forming procedures,the micro distribution rule of residual oil and affected primary and second factors are researched by water flooding,polymer flooding and week gel flooding processes.This paper presents the classification of the residual oil into such three types as movable oil,movable oil due to some special conditions and non-movable oil.The study shows that the heterogeneity of reservoir rocks results in forming of the residual oil.The residual oil by water flooding process is mainly distributed in the un-swept area,the surface of oil-wet stone,sealed pore,micro pore,low permeability layer and partially blocked pore.The residual oil by polymer flooding process is mainly in sealed pores(non-movable oil),micropores and surface of oil-wet stone(condition movable oil).The residual oil by weak gel flooding process is in sealed pores and surface of oil-wet stone.