宾汉非牛顿稠油微观驱替特征

MICROSCOPIC DISPLACEMENT FEATURES OF BINGHAM NON-NEWTONIAN VISCOUS CRUDE OIL

利用加入毛管力修正项的Ｂｕｋｌｅｙ－Ｌｅｖｅｒｅｔｔｅ偏微分方程，对水驱宾汉型稠油进行了数值求解，并研究了毛管力和重力对水驱宾汉稠油的影响．结果表明，含水饱和度和驱替效率不仅与相对渗透率有关．还要受到稠油内在的宾汉非牛顿特征的影响．毛管力在水驱宾汉稠油低速渗流时对驱替的影响较为显著，其影响程度与稠油的非牛顿性有关．在油田开发实践中，水驱稠油低速渗流时．要充分考虑和利用毛管力进行驱油．

By the use of Bukley-Leverette partial differential equation with additional capillary pressure modified item, numerical solution for the displacement of Bingha heavy oil by water is obtained. The results reveal that water saturation and displacement efficiency are controled not only by the relative permeability but also by the inherent Bingham non-Newtonian feature. The effects of capillary and gravitation on the displacement of Bingham heavy oil by water at a low-speed are studied. The result shows that the effects of capillary on Bingham heavy oil displacement at a low-speed is more significant, and the degree of its effect is relative to the non-Newtonian character of heavy oil. In practice of oil field development, capillary pressure should be considered under the condition of displacement by water with a low speed.