FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry. Weighted mineralized clayless drilling mud contains, wt%: sodium formate 37–42; xenatane type polysaccharide "StabVisco-F" 0.27–0.32; modified starch "MK-3" 0.84–1.06; hydrophobizing liquid GKZh-11 0.69–1.01; lubricating additive "Ekstra-S" 1.63–1.97; water is the rest; weighting additive – galena weighting agent to a density of 1,900–2,600 kg/m3 in excess of 100 wt%.
EFFECT: improvement of the weighted drilling mud quality, optimization of structural and rheological properties, accident-free drilling of deep wells under conditions of high reservoir pressures and temperatures.
1 cl, 2 dwg, 1 tbl
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