Thomas W. Beihoffer, David S. Dorrough, Calvin K. Deem, Donald D. Schmidt, Ronald P. Bray Amoco Production Research Tulsa A recently developed cationic polymer/brine drilling fluid (CBF) system, tested in a number of wells drilled in the U.S. and the North Sea, can replace oil-based fluids in certain applications. The field tests have shown CBF to be more inhibitive than other water-based muds used in the same areas. To date, the primary applications have been in large diameter hole sections drilled through Tertiary shales with high smectite clay content. The CBF system uses a cationic polymer and potassium chloride for shale...

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