| 摘要 |
An oil-based demulsifying formulation which can be used in the treatment of drains bored in oil-based mud, non ecotoxic and optimally compatible with formation fluids, comprises at least one wetting agent selected from the group consisting of anionic surfactants and at least one demulsifier (or "emulsion breaker") selected from the group consisting of copolymers of ethylene oxide and propylene oxide, alcohol or phenol derivatives with alkoxylated or polyalkoxylated chain formations, polyalkyleneglycols, polyamines, alkoxylated or polyalkoxylated derivatives of amines, quaternary ammonium salts, quaternized alkanolamine esters, alkyl esters of fatty acids or natural oils, possibly alkoxylated or polyalkoxylated, and silicated derivatives such as polysiloxanes.
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