Assesment of rheological properties of drilling fluids based on rotational viscometry data

Abstract

The model of interpretation of rotational viscometry data is described using a strict solution of the Couette flow equation and considering the information resulting from the experiments. Using the example of common rheological models of drilling muds, the influence of the radii ratio and rheological properties on the accuracy of their estimation was studied using the dependence of the Newtonian fluid shear rate gradient. Comparative results of the rheological properties assessment for drilling muds in industrial conditions are given. Keywords: bi-viscous fluid; Couette flow; maximum likelihood principle; rheologically stationary models.