FIELD: organic chemistry, polymers. SUBSTANCE: invention describes copolymer of acrylamide and its nonionogenic derivatives, sulfo- derivatives of acrylamide, acrylonitrile and acrylic acid of the general structural formula (I) 
where Me means H and/or alkaline metal or alkaline-earth metal cation and also ammonium and triethanolamine of molecular mass 7.7 x 103 - 2.4 x 106 Da as regulator of filtration of drilling liquids and stabilizing agent of mineral dispersions in drilling under usual and complex conditions (thermosaline corrosion and the presence of carbonic acid and hydrogen sulfide). EFFECT: valuable properties of copolymer. 5 cl, 8 tbl, 3 ex
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