FIELD: oil and gaseous industry.
SUBSTANCE: invention relates to heavy drilling fluids used in drilling holes under conditions of abnormal high sheet pressures (AHSP). Proposed heavy drilling fluid comprises the following components, wt.-%: clay powder of sort Bentocon Super "S", 0.7-2.1; biopolymer Acinetobacter sp. "Ritizan", 1.2-9.1; calcium chloride, 1.4-3.0; flotation reagent T-80, 1.1-3.5; potassium hydroxide, 0.04-0.13; condensed sulfite-alcohol brewery mash KSSB, 3.2-7.1; barite, 13.2-56.9, and water, the balance.
EFFECT: improved and valuable properties of fluid.
10 ex
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