FIELD: drilling of gas and oil wells; drilling muds for prevention of lost circulation and drilling-in of productive strata at low formation pressure.
SUBSTANCE: proposed low-density drilling mud contains the following components, mass-%: bentonite, 1-2; stabilizing agent - carboxymethyl cellulose КМЦ, 0.6-0.8; hydrolized polyacrylonitrile "unifloc", 0.1-0.2; xanthane biopolymer, 0.08-0.10; water-repellent agent, 0.05-0.10; aluminosilicate microspheres, 5-20; the remainder being water. According to another version, drilling mud contains carboxymethylated starch in the amount of 1.0-1.4 mass-% instead of carboxymethyl cellulose which is used as stabilizing agent.
EFFECT: improved quality of drilling mud due to enhanced insulating and rheological properties and stability.
3 cl, 3 tbl, 1 ex
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