Modeling and rheological characterization of sludge based drilling oil

When the drilling mud is in contact with more or less permeable walls of the well, the liquid filter part in the formation by depositing on the walls of the solid part is called the cake (silty clay film). Among the main functions of drilling fluid include keeping the walls of the well due to the hydrostatic pressure exerted by the flowing fluid. Also, the mastery of the rheological properties of the mud used is required. . The rheological characterization focus on the drilling mud used for drilling the 121/4 phase in the well AY (Hassi Messaoud) is an invert emulsion mud with oil report / water 85/15 and its density is 2.04, consisting essentially of gas oil, organophilic clay, two emulsions, sodium chloride and barite. It would define the rheological model of drilling fluid used and seek the most suitable rheological model. The rheological tests were carried out using a Fann viscometer 6-speed (3, 6, 100, 200,300 and 600 rpm) to determine the rheological properties of the mud as the yield value or yield stress, the plastic viscosity and apparent viscosity. Other rheological parameters such as the consistency index (k) and the behavior index (n) of the mud were estimated. The results show that the Herschel-Bulkley model is a minimal deviation from other models (model Bingham and Ostwald de Waele or Power