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The study is based on the effects of carboxymethyl starch reagent KMK-Bur-N Carboxymethyl starch reagent KMK-Bur-N is an additive to water-based drilling fluids for regulating filtration, structural, mechanical and rheological parameters in the manifestation of mineralized mineral waters containing Ca ++ and Mg ++ ions. KMK Bur-N reagent is produced according to TU 2262-016-32957739-01 by the company CJSC "Polycell" (Vladimir, Russia). Carboxymethyl starch is a chemical product of the interaction of starch with sodium mono chloroacetate in an aqueous solution of sodium hydroxide. The KMK-Bur-N reagent can also be used as part of process fluids for well completion and workover. Details are given on the physicochemical properties of KMK Bur-N reagent. The addition of the KMK-Bur-N reagent to the bentonite suspension leads to a decrease in the filtration index, as well as an increase in the conventional viscosity, plastic and effective viscosity, dynamic and static shear stress. In

THE STUDY OF METHYL CARBOXY STARCH REAGENT FOR DRILLING FLUIDS