FIELD: mining industry.
SUBSTANCE: present invention relates to well shaft servicing liquids. Non-aqueous liquid for well shaft servicing, containing additive to reduce water loss, wherein said additive to reduce water loss contains product of reaction of (i) functional polymer, containing maleic anhydride copolymer, in which maleic anhydride content is from nearly 10 % to nearly 90 %, and (ii) oligomer fatty acid. Method of oil deposit operation, involving introduction of non-aqueous well shaft servicing liquid inside well, where said liquid contains additive to reduce water loss, containing reaction product of (i) functional polymer, containing maleic anhydride copolymer, in which maleic anhydride content is from nearly 10 % to nearly 90 %, and (ii) oligomer fatty acid. Invention is developed in depending points of the formula.
EFFECT: technical result is increased efficiency of reducing loss of well shaft servicing liquids.
24 cl, 2 ex, 4 tbl.
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