PURPOSE: A demulsifier for oil field is provided to provide a water-soluble anion antimulsifier high polymer dispersion which is even more effective in processing oil of W/O and an oil treatment-free type. CONSTITUTION: A demulsifier for oil field includes a radical copolymer of an effective concentration 5-35 weight%, an average particle size 1-50 m, and an anion drawing 5-80 mol% among a 35-45 (w/v) % aqueous solution of (a)anionic monomer, (b)non-ionic monomer, (c)an ion dispersing agent, selected more than one among a group composed of each homopolymer and its copolymer of acrylic acid, the sodium acrylate, the methacrylic acid, the methacrylic acid soda, 2- acrylamide, 2- methyl 1- propansulfonic acid, (d)non-ionic surfactant, (e)anionic surfactant or an amphoteric surface active agent, (f)radical polymerization initiator, and (g)ammonium sulfate refined to a high density filter of 900 -3000 mesh. An anionic surfactant is selected more than one from a group composed of the polycarbonic acid or the salt, the carboxy mehyl cellulose sodium salt, and the carboxymethycellulose ammonium salt and sodium alginate. An amphoteric surface active agent is selected more than one from a group composded of the alkylbetaine, the alkyl amidorpopyl betaine, the alkyl sulphobetaine, the alkylcarboxyl betaine, the alkyl imidazoline and alkyl amino fatty acid salt. An ion dispersing agent is pH 5-6 before copolymerizing and the demulsifier for oil field is pH 4-7.5.
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