ANALYSIS OF METHYLENE BLUE TEST ON WATER BASE MUD

Abstract

This internship report presents the activities and findings from a one-month internship program conducted at PT. COSL Indo under the Oilfield Chemical Division. The primary focus of the internship was the formulation and testing of water-based drilling mud, with specific attention to the Methylene Blue Test (MBT). This test is used to evaluate the reactive clay content in drilling mud based on its cation exchange capacity, which influences mud stability and performance. The laboratory work involved preparing fresh mud samples, conducting various standard mud property tests, and performing MBT titrations. An increase in MBT after circulation indicates clay contamination from the formation, while a decrease may suggest a loss of active additives like bentonite.