纵向非均质油藏水驱油实验研究

VERTICALLY HETEROGENEOUS RESERVOIR WATER FLOODING OIL TEST

针对纵向非均质油藏普遍存在层间矛盾突出、水驱采收率低、低渗储层难以动用的特点,纵向非均质严重影响了油藏的高效开发问题,开展了多层长岩芯水驱油实验。实验采用最新研制的带多测压点的多层长岩芯驱替模型,该模型可以记录沿程压力变化,更加准确地反映水驱动态。研究结果表明:不同的注水方式对中低渗层的采出程度影响很大;提高注入速度可以提高不同渗透层的压力,且渗透率越低压力提高幅度越大;层间干扰严重,不同工作制度下低渗层压力变化很大。该研究成果对于选择合理的开发层系组合、采取适当的注水方式具有指导意义,为今后非均质油藏高效开发提供了试验依据。

To vertically heterogeneous reservoir in which,waterflooding efficiency is low,Interlayer contradiction is serious,and low-permeability reservoir is difficultly produced.New long core test model is developed with three pressure nodes measured on the each experimental long core of three long cores.The result is that different water injection methods,for example,mixed water injection or water separating injection,exsert greatly impact on middle-permeability and low-permeability reservoir recovery.The pressure of the reservoirs with different peamility can be increased by enhancing injecting rate,and the lower permeability is,the higher pressure can be increased.Interlayer interference is serious,low-permeability reservoir pressure changes greatly under the condition of different water injection methods.The conclusion affords experimental foundation for rightful layer series of development assemble and water injection methods.