Oil-Based Drilling Fluid

Drilling fluid in which the continuous phase is not miscible with water, and water or brine is the dispersed phase. NOTE Oil-based drilling fluids are usually referred to as non-aqueous drilling fluids, or NAF.

Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global Standards


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