FIELD: construction.
SUBSTANCE: invention relates to water-based drilling fluids and can be used, when drilling oil and gas wells, in drilling unstable clay rocks in terrigenous and saline deposits in conditions of high temperatures of up to 200 °C. Cationic drilling mud contains, wt%: gel powder 3-5; polydadmac 1.75-3.50; cationic polymer Rosfloc KF 0.5-2; Polyvinyl pyrrolidone 0.3-3.0; water - rest.
EFFECT: technical effect consists in improvement of solution fastening properties and preservation of stability (integrity) of well shaft walls at simultaneous increase of inhibiting properties of solution.
1 cl, 1 dwg, 3 tbl
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