FIELD: oil and gas production. SUBSTANCE: polysaccharide-based retardant contains product of reaction of hydrogen peroxide with urea or borate, or silicic acid sodium salt having active oxygen content at least 6.8% and added to fluid in amounts 0.01 to 0.04 wt %. EFFECT: stabilized rheological and filtration properties of drilling fluid, prevented fermentation thereof, and reduced consumption of retardant. 2 tbl, 2 ex
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