Study on capillary number curve of binary compound flooding in offshore oilfield

摘要

In allusion to offshore heavy oil reservoir with high viscosity and high permeability and other formation characteristics, we carried out indoor physical simulation flooding experiments and compared the similarities and differences of the capillary number curve between the situation of heavy oiland the situation ofthin oil though the experiment. Research shows: under the condition of heavy oil reservoir with high permeability, there is a critical value when the capillary number between 10~(-2)～10~(-3).whenthe capillarynumber is greater than the critical value, the displacement efficiencycanimprovegreatly; When the capillary number reaches 10~(-1), oil displacement efficiency and residual oil saturation tends to stabilization. The trend of capillary number curve is roughly same under the condition of heavy oil and thin oil, the range of critical value is same.