Terry Hemphill Baroid Drilling Fluids Inc. Houston Rob Valenziano, Peter Bale Baroid Drilling Fluids Inc. New Orleans Byron Sketchler Chevron U.S.A. Inc. New Orleans A cationic water-based mud reduced bit balling and increased rates of penetration (ROP) in several Gulf of Mexico wells where highly permeable sands and dispersive formation clays and shales typically cause drilling problems. The cationic polymers adsorb on the negatively charged sites on shales and clays and immediately inhibit reactive formation solids. The filtration and mud cake qualities illustrate that effective filtration control is obtai...

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