WEIGHTED INVERT-EMULSION DRILLING MUD Russian patent published in 2018 - IPC C09K8/36 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry. Drilling mud for opening the seams with anomalously high bottom hole temperatures and reservoir pressures contains, mass%: VMGZ mineral oil 56.13–59.50; alpha-olefins of fraction C12-C14 18.71–21.60; organobentonite BENTOLUX OVM 1.82–2.18; synthetic polymer latex 2.58–3.02; emulsifier MP-150 2.61–3.09; calcium oxide CaO 0.39–2.38; 30 % aqueous solution of calcium chloride CaCl₂ 7.44–15.32; water repellent ABP-40 1.86–2.14 and a galenic weighting agent – to the required density in excess of 100 % by weight.

EFFECT: optimization of structural and rheological properties of the drilling mud, ensuring of trouble-free drilling of deep wells in conditions characterized by high bottom hole temperatures and abnormally high reservoir pressures.

1 cl, 2 dwg, 1 tbl