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ABSTRACT
Higher fluid loss volumes and suspension capability are the critical limitations of water-based muds. It can heighten problems during drilling operations. The rheological and filtration properties of all drilling muds have been continually considered as the most essential characteristics of drilling mud for a successful drilling operation. Various irreversible problems, such as differential sticking, borehole instability, formation damage, and uncontrollable formation fluids intrusion to the wellbore, are directly related with drilling fluids filtration and rheological properties. The solution to these problems is of paramount importance, especially at high temperature and pressure conditions of the wellbore. This study aims to formulate a low-solid drilling fluid by replacing PAC R in conventional KCL polymer fluids with an equal amount of Kaolin, a local material abundant in Nigeria. The effect of Kaolin on filtration characteristics of Water-Based Muds (WBMs) in static conditions is investigated at elevated temperatures and pressures. Various mud blends were prepared containing the different kaolin samples from different locations in Nigeria and in the presence of PAC R at different replacement levels.
