Experimental study on rheological property for cement slurry and numerical simulation on its annulus flow

Uniformity of annulus flow is important in well cementation.Three cement slurries were tested on rheological performance.Based on the experimental data of rheological property,numerical simulation analysis was conducted.It is demonstrated that the model of H-B is!the optimum model.Annulus flow processes of cement slurry were simulated with FLUENT software.The inner and outer diameters of the simulated annulus wellbore are 0.18 and 0.24 meters respectively,and its length is 8 meters.The influences of eccentricities of casing,velocity,and rheological property of the cement slurry on non-uniformity of the annulus flow were understood.The simulated results indicate that eccentricity is the main factor controlling annular flow,the flow is uniform with an low eccentricity.Velocity and rheological parameter also affect flow field,while increasing the velocity and decreasing the yield stress,the power-law index and the consistency index of the fluid are helpful to increase the uniformity of the annulus flow.