变形介质中宾汉稠油驱替特征

Displacement Characeristics of Bingham Heavyoil in Deformed Reservoir

通过建立变形介质中考虑启动压力梯度的一维两相宾汉稠油驱替的数学模型,并进行了数值求解,分析了地层变形以及启动压力梯度对水驱稠油的影响,分析表明:介质变形对含水饱和度的分布没有影响,而对地层压力的影响是非常显著的,随着变形介质弹性的增加,地层压力越来越低,并且越靠近注入端,地层压力下降越快;原油的启动压力梯度同时影响含水饱和度和地层压力的分布,在其它条件一定时,启动压力梯度的存在,造成地层压力的增加和平均含水饱和度的降低。在油田开发实际中,应考虑地层变形和启动压力梯度的影响,以提高原油采收率。

A one-dimension mathematical model is established for the displacement of Bingham heavy oil in the deformed reservoir ,and the minimum pressure gradient is considered in it. The numerical solution of the model is derived. The effects of the deformation and the minimum pressure gradient on the displacement of Bingham heavy oil are analyzed. The analytical result shows that, the deformation of the reservoir has no effect on the distribution of the water saturation. But it has an apparent effect on the distribution of the formation pressure. The formation pressure decreases with the increasing of the deformed reservoir's elasticity, and it reduces rapidly near the injection well. The minimum pressure gradient of heavy oil affects the distribution of the water saturation and the formation pressure simultaneously. With the minimum pressure gradient increasing, the water saturation decreases and the formation pressure increases if other conditions are constant. The deformation of the reservoir and the minimum pressure gradient of heavy oil should be considered in reservoir development in order to obtain a higher oil recovery efficiency.