GEL-DRILL DRILLING FLUID Russian patent published in 2019 - IPC C09K8/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry. Drilling fluid contains, wt. %: sodium carbonate 0.3–0.5; sodium hydroxide 0.2–0.4; PBMA clay powder 4–7; viscosity reducing agent FHLS-M 1.0–1.5; defoamer DB 0.1; high viscosity cellulose ANIPOL-BB 0.2–0.4; low viscosity cellulose ANIPOL-HB 0.3–0.5; calcium carbonate 33–36; cement PCT-1-50 4–5; potassium hydroxide 0.2–1.0; BL-SALT lubricant additive 2.0–5.0; water is the rest being.

EFFECT: technical result is the comprehensive increase in inhibiting and waterproofing properties and resistance to the carbon dioxide aggression effects on the drilling fluid.

1 cl, 2 ex, 3 tbl