HIGH-CATION-INHIBITED DRILLING MUD Russian patent published in 2022 - IPC C09K8/32 B82Y99/00 

FIELD: drilling of soil or rocks.

SUBSTANCE: invention relates to drilling of vertical, directional and horizontal wells, in particular represented by thick deposits of high-viscosity clays, prone to swelling and softening, including with changes in wellbore integrity, especially in its horizontal part. High-cation-inhibited drilling mud for drilling wells contains, wt.%: marble chips 5–10; polyanionic cellulose 5–7; sulfonol 2–5; potassium chloride 2–5; potassium methyl siliconate 1–4; potassium acetate 1.5–4; bischofite 2–5; potassium formate 1–5; ferrochrome lignosulphonate 1–5; organosilicon liquid GKZH-11 2–5; barite 0.5–5; antifoaming agent Penta 465 0.5–1; potassium aluminate 1–5; calcium chloride 1–5; nanodispersed copper 0.5–4; magnesium chloride 1–5; liquid phase — water and wastes obtained during production of vegetable oils, in ratio 55/45–80/20 — the rest.

EFFECT: improvement of structural-rheological, inhibiting, lubricating, filtration, anti-wear, fixing and anti-seizure properties of drilling mud for construction of wells in difficult geological conditions.

1 cl, 1 tbl