MODELING OF RHEOLOGICAL PROPERTIES OF CLASS G CEMENT SLURRY

The role of rheology is important during cement slurries design because it directly affect the quality of primary cementing in the area of determination of the relationship of pressure to depth during and after repression, return circulation to calculate the phase of "free fall", forecasts temperature profile during pumping a cement slurry design and capacity required for optimal suppression of cement puree. With the aid of design of experiment three different regression models were developed for plastic viscosity (PV), apparent viscosity (AP) and yield point (YP) for class G cement slurry subject to behavior of four different variables extender (A), accelerator (B), antifoam (C) and dispersant (D). A full factorial design at two level was used to analyze sixteen experimental run replicated twice. The analysis was done with design expert 6.08. The regression equations developed for plastic viscosity, apparent viscosity and yield point established important parameters that affect the rheology properties with correlation coefficient of 0.9939, 0.9543 and 0.9574 with corresponding standard error of 0.098, 0.00437 and 0.3 respectively.