THE LUBRICITY PERFORMANCE OF HURA CREPITANS AND CALOPHYLLUM INOPHYLLUM PLANT OIL IN WATER-BASED MUD IN ANALYSING DIFFERENTIAL PIPE STICKING

This study applied diesel oil, and oil from two non-edible plant seeds which are Hura crepitans and Calophyllum inophyllum. These non-edible oils were extracted from their seeds using the soxhlet extractor and used in the oil-in-water emulsion mud. Mud lubricity tester was used to determine the torque, coefficient of friction, and mud lubricity coefficients were calculated at different revolutions per minute and concentrations of the oil. The rheological properties of the mud were also tested. The results obtained from the experiment showed that Hura crepitans in water-based mud have the highest mud lubricity coefficient, and next is oil from Calophyllum inophyllum. It was also discovered that diesel oil in the water-based mud has a negative effect on the coefficient of friction, the mud formulated with the plant oils has the lowest volume of fluid loss when compared to ordinary water-based mud and that of the diesel oil. The mud formulated with oil from Hura crepitans has relatively higher plastic viscosity most especially at concentrations above 15 ml, and the addition of Calophyllum inophyllum has the highest yield point values and gel strength. The plant oils most especially Calophyllum inophyllum used in mud formulation reveals lower pullout force and greater potential for minimizing differential pipe sticking.