HIGHLY INHIBITED INVERT DRILLING AGENT Russian patent published in 2019 - IPC C09K8/36 

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to drilling of vertical, directional and horizontal wells, in particular, represented by powerful deposits of high-viscosity clays susceptible to swelling and softening, including changes in integrity of the well shaft, especially in its horizontal part. Highly inhibited invert drilling fluid for drilling wells in difficult mining and geological conditions contains, wt%: marble chips 5–10; polyanionic cellulose 5–10; potassium chloride 2–5; potassium methylsiliconate 1–4; potassium acetate 1.5–4; ferrochrome lignosulphonate 1–5; organosilicon liquid GKZh-11 2–5; barite – 0.5–5; antifoaming agent – 0.5–1; potassium aluminate 1–5; surfactant PAV-OP-10 1–2; emulsifier MP 1–5; reagent K–4 1–10; flaking graphite 0.5–5; water – balance.

EFFECT: improved structural-rheological, inhibiting, lubricating, filtration, fixing, anti-gripping and environmental properties of drilling fluid for construction of wells in complex geological conditions.

1 cl