平面非均质性对剩余油分布规律的影响研究

为了明确储层平面非均质性对剩余油分布规律的影响,运用人造物理模型制作技术制作了三维物理模型,并用恒速法对不同的三维平面非均质模型进行水驱油试验。实验发现:注入井位于垂直沉积相带的驱油效果优于注入井位于沿沉积相带;注入井位于中低渗层时调整井网增产效果明显;井网垂直沉积相带低注高采总注入PV数比其他方案少,且采出程度最高。测定不同时刻电极的电阻率,利用双狐软件画出不同平面非均质模型剩余油分布情况。测定结果表明,平行沉积相带布井方式,注入井布于高、中渗层时,水驱剩余油主要分布在低渗带处;注入井布于低渗层时,剩余油富集在注入井对角处。垂直沉积相带布井方式,注入井位于低渗时,剩余油分布较均匀,无明显的剩余油富集区,模型全部波及。注入井位于高渗时,剩余油主要分布在低渗相带,是剩余油进一步挖潜的主要目标。

PLANE HETEROGENEITY STUDY ON THE EFFECT OF RESIDUAL OIL DISTRIBUTION

In order to clarify the impact of reservoir heterogeneity plane distribution of remaining oil,using artificial physical modeling technology to produce a three-dimensional physical model,and use constant speed method for three-dimensional plane heterogeneity of different models of water flooding test. It was found that: Flooding effect vertical injection wells located sedimentary facies superior to injection wells located along the sedimentary facies. Adgusting well pattern to Increase yield obvious when injection wells located in low-permeability layer; Well vertical sedimentary facies Low Note High Mining is less than the total number of injecting PV other programs and the highest level of recovery. Measured resistivity electrodes at different times, using Double Fox software to draw a different plane heterogeneous model of the distribution of remaining oil. The results show: Parallel sedimentary facies well pattern, injection wells distributed in the high, medium diffusion layer, waterflood residual oil is mainly distributed in the low permeability zone. When the injection well distributed in the low permeability layer, residual oil in the injection well on the corner. Sedimentary facies vertical well pattern, injection wells located in low permeability, the remaining oil distribution is more uniform, no significant residual oil-rich region, the model of all affected. Of hypertonic injection well located, the remaining oil is mainly distributed in hypotonic facies, is the main objective to further tap the potential of the remaining oil.