UNDERBALANCED DRILLING GUIDELINES IMPROVE SAFETY, EFFICIENCY

Dale Eresman Energy Resources Conservation Board Calgary Although many operators follow safe and efficient practices in underbalanced drilling, the use of consistent procedures and equipment configurations can improve operations. In underbalanced drilling, the primary means of well control, the hydrostatic head of the drilling fluid, is lost either unavoidably because of hole problems (such as abnormally high pressure or lost circulation) or intentionally because of economics or to prevent

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