Recovering base oil from contaminated invert emulsion fluid for making new oil-/synthetic-based fluids
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United States of America Patent
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Nov 5, 2019
Grant Date -
Dec 29, 2016
app pub date -
Jun 22, 2016
filing date -
Jun 25, 2015
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Abstract
Base oil can be recovered from contaminated O/SBF by combining a chemical process with a mechanical process. The chemical treatment includes adding a demulsifier, an anionic surfactant, a non-ionic surfactant and/or a mutual solvent to the contaminated O/SBF in an amount effective to separate the base oil from the contaminated O/SBF fluid followed by mechanical separation of oil from water, and optionally from any solids present. The recovered base oil (i.e. conventional drilling fluid, conductive drilling fluid and constant rheology drilling fluid, etc.) may then be reformulated to make a new OBM of the same type from which the base oil was recovered, or as a fuel for engines.
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