变形介质中粘弹性稠油驱替特征

通过建立变形介质中考虑弛张特性的一维两相粘弹性稠油驱替的数学模型 ,并进行数值求解 ,分析了地层变形以及弛张特性对水驱稠油的影响 .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 ;原油的弛张特性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 ,随着弛张时间的增加 ,含水饱和度越来越低 ,地层压力越来越高 .在油田开发实际中 ,应考虑地层变形和原油弛张特性的影响 ,以提高原油采收率

Displacement Characteristics of Viscoelastic Heavy Oil in Deformed Reservoir

Since the deep seated reservoir bears high pressure and high temperature, it will produce partial or complete irreversible deformation in its development process. In the percolation flow and displacement processes of viscoelastic heavy oil, it has relaxation property. The deformation of the reservoir and the relaxation property of the heavy oil apparently influence the reservoir's dynamic characteristics. A one dimension mathematical model is established for the displacement of viscoelastic heavy oil in the deformed reservoir, and the relaxation property is considered in it. The numerical solution of the model is derived. The effects of the deformation and relaxation property on the displacement of viscoelastic heavy oil are analyzed. The analysis result shows that, the deformation of reservoir has no effect on the distribution of water saturation. But it has an apparent effect on the distribution of the formation pressure. The formation pressure decreases with the increase of the deformed reservoir's elasticity, and it reduces rapidly near injection wells. The relaxation property of the heavy oil influences simultaneously the distribution of the water saturation and the formation pressure. With relaxation time increasing, the water saturation decreases and the formation pressure increases if other conditions are constant. The deformation of the reservoir and the relaxation property of heavy oil should be considered in reservoir development in order to obtain a higher recovery factor.