INVERT MUDS HELP REDUCE SLOUGHING SHALE PROBLEMS

Don L. Myers Canadian Hunter Exploration Ltd. Calgary Oil-based invert muds helped prevent sloughing shale problems and decreased the time to reach total depth in several wells in Canada. The benefits of invert muds include increased penetration rates, reduced hole enlargement, more dependable open hole evaluation, and more efficient primary cement jobs. But invert muds have several pitfalls and potential problems.

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