FIELD: construction.
SUBSTANCE: invention relates to construction of oil and gas wells. Drilling mud for well construction under conditions of abnormally high reservoir pressures and high temperatures includes, wt. %: xanthane biopolymer 0.08–0.22; starch reagent 0.28–0.76; lignosulphonate 0.30–0.82; potassium chloride 2.38–6.56; potassium formate 8.06–22.18; ground marble 1.98–5.46; barite filler to 63.70; water 23.22–63.92.
EFFECT: technical result is high sedimentation stability at high temperatures and possibility of weighting drilling fluid to density of 2_30 g/cm3, thermal stability up to 150 °C, high inhibiting power of clay hydration, resistance to biodegradation, good lubricating properties.
1 cl, 1 dwg, 4 tbl
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