非均质储层模型微观水驱油实验

储层的非均质性不但普遍存在，而且是影响注水开发油藏水驱效率和开发后期剩余油分布的重要因素。利用微观模型水驱油实验，研究了横向、纵向及平面共6种非均质模型在不同注采方式下微观水驱油机理。针对不同非均质模型和注采方式下剩余油分布特点，研究了改变注采方向和驱替压力对提高水驱采收率的影响。改变注采方向后，横向和平面非均质模型采收率分别提高了2．89％和5．42％；对于纵向非均质模型，首次低注高采改变为高注低采后提高采收率3．72％，反之提高了1．26％。提高驱替压力后，横向及纵向非均质模型的采收率分别提高了35．65％和31．26％，平面非均质模型只提高了8．10％。

Experimental study of water-oil displacement with microscopic models of heterogeneous reservoirs

The heterogeneity of a reservoir not only exists as common,but also is an important factor that influences waterflood efficiency of waterflood oil reservoir and distribution of remaining oil during the later development period.In water-oil displacement test by microscopic model,the microscopic water-oil displacement mechanism of 6 sorts of horizontal,vertical and areal heterogeneity models under different injection-production ways are studied.According to the remaining oil distribution features of different heterogeneous models in different injection-production ways,the influence of changing injection-production direction and displacement pressure on improving waterflood recovery is studied.By changing the injection-production direction,the recovery factor of the horizontal and areal heterogeneity models increases by 2.89% and 5.42% respectively.The recovery factor of the vertical heterogeneity model increases by 3.72% when the low injection and high production manner is first changed into high injection and low production,while the recovery factor increases by 1.26% on the contrary.After raising the displacement pressure,the recovery factor of the horizontal and vertical heterogeneity models increases by 35.65% and 31.26% respectively,and the areal heterogeneity model only increases by 8.10%.