摘要:In cementing engineering of petroleum industry, how to improve the displacement efficiency of cement slurry displacement drilling fluid is a prerequisite to ensure the quality of cementing. To effectively improve the displacement efficiency, we conducted numerical simulation of the displacement efficiency of eccentric annulus under different well deviation angles based on FLUENT software. This method allows for a more intuitive observation and understanding of displacement by analyzing volume of fluid (VOF). Through the research, the relationship between different displacement speed, eccentricity and positive density difference and displacement efficiency under constraints of different well deviation angles was obtained. The experimental results showed that under different well deviation angle conditions, the displacement efficiency of eccentric annulus increases first and then decreases with the increase of displacement velocity, and it has the highest efficiency under certain eccentricity. At the optimal displacement speed, the displacement efficiency has a decreasing trend with the increase of the well deviation angle, but when the eccentricity is 0.3, the displacement efficiency value is relatively high. With the increase of positive density difference and the well deviation angle, the decrease of the displacement efficiency is more obvious at large angles, and the displacement efficiency is a relatively stable high value when the positive density difference is 400-600 kg/m~3.