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→Oil-based muds
* ''Formation evaluation''—Some wireline logs should not be run in oil-based muds. Also, additional steps are needed to remove oil coatings from cuttings before they are described. (For more information on wireline tool compatibility with drilling fluid composition, see [[Basic tool table]], and for more on removing oil coatings from cuttings, see [[Mudlogging: Drill cuttings analysis]].)
* ''Formation evaluation''—Some wireline logs should not be run in oil-based muds. Also, additional steps are needed to remove oil coatings from cuttings before they are described. (For more information on wireline tool compatibility with drilling fluid composition, see [[Basic tool table]], and for more on removing oil coatings from cuttings, see [[Mudlogging: Drill cuttings analysis]].)
Oil-based muds contain three phases: ''oil, brine,'' and ''solids phase.'.
Oil-based muds contain three phases: ''oil, brine,'' and ''solids phase.''
====Oil phase====
====Oil phase====