FIELD: drilling fluids. SUBSTANCE: invention provides clay-free drilling mud containing 3.0-8.0% carbon-containing substance, 0.2- 0.5% (on conversion to solids) hydrolyzed polyacrylonitrile, and water, said carbon-containing substance being fine fraction of coal benefication waste. EFFECT: improved pseudoplastic and structural-mechanical properties of mud and reduced consumption of reagents. 3 tbl
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