CATIONIC POLYMER DRILLING FLUID CAN SOMETIMES REPLACE OIL-BASED MUD

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

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