FIELD: mining; well construction.
SUBSTANCE: inhibiting drilling agent for mud shale contains in mass percent: 5-10 of salt-tolerant clay, 5-30 of potassium chloride, 5-10 barium hydroxide, 2-3 of starch, 0.75-1.5 of condensed sulfite-alcohol grains (CSAG) or oxyl 5-6, oxyethyl cellulose (OEC), remaining - water. The specified solution contains 5-10 mass percent of potassium chloride, for unstable mud of terrigenous deposits, and 5-10 mass percent - for salt deposits and intersalt muds.
EFFECT: endurance and water-resistance of mud shale is increased, complications due to slough, rockslide and cavity formation, soft mud sliding and bore restriction in drilling, are prevented.
2 cl, 3 tbl, 2 dwg
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