FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry, particularly to drilling fluids. Weighted drilling mud on hydrocarbon base contains, wt %: dispersion medium – synthetic liquid on hydrocarbon base 42.7–48.7; disperse phase – 30 % aqueous solution of calcium chloride 7.75–11.00; organobentonite Orbent-91 1.75–2.70; oil-soluble polymer of NRP-20M 1.10–1.35; Poly-stalk emulsifier Stab-KD 1.10–1.35; water repellent ADB-40 0.80–1.50; calcium oxide 0.50–0.80; barite filler 37.35–39.55.
EFFECT: technical result is optimum lubricating, inhibiting and structural-rheological properties of drilling agent, prevention of complications during drilling of flat wells with zenith angles of more than 60 degrees, including with horizontal ends, in intervals characterized by abnormally high formation pressures and high temperatures.
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