CONVERTING INVERT EMULSIONS TO EMULSIONS USING POLYVALENT SALTS OF POLYMERIC WEAK ACIDS

摘要

An additive comprising: a polymeric weak acid, wherein the polymeric weak acid is in a free acid form or in a monovalent, divalent, or trivalent salt form of the polymeric weak acid, and wherein the additive converts an invert emulsion having an external phase comprising a hydrocarbon liquid to an emulsion having an external phase comprising water. The additive can be added to the invert emulsion in a dry form or included in a base fluid. The invert emulsion can include polyvalent cations. The base fluid can also include a second additive comprising polyvalent cations.