Abstract
This chapter includes the main characteristics and rheological and thixotropic properties of drilling fluids. The drilling fluid is composed of a liquid phase and a solid phase. The rheological properties characterize the flow behavior of the drilling fluids, including the resistance to displacement of some bodies in the fluid mass. These properties allow to evaluate the pressure and pumping energy of the drilling fluids, the washing conditions as well as the evacuation of the detritus, the danger of erosion of the walls. To describe the behavior of rheological fluids, we use the Bingham and Ostwald de Waele models.
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