CATION-INHIBITING DRILLING MUD (VARIANTS) Russian patent published in 2018 - IPC C09K8/12 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas production industry and can be used for drilling and repairing wells, including for opening productive layers in complex mining and geological conditions. Cationic inhibitory drilling mud of the first embodiment contains, by weight: xanthan biopolymer 0.25–0.55; starch reagent 0.35–3.0; polydadmac 0.5–2.0; water-soluble salt 0.85–35.0; microcolmatant 2.0–10.0; water – balance. Cationic inhibitory drilling mud of the second embodiment contains, by weight: xanthan biopolymer 0.25–0.55; starch reagent 0.35–3.0; polydadmac 0.5–2.0; water-soluble salt 0.85–35.0; low molecular weight cationic inhibitor of the amine type 0.5–1.5; microcolmatant 2.0–10.0; water – balance.

EFFECT: improvement of structural-rheological parameters of cation-inhibiting drilling mud.

6 cl, 3 dwg, 1 tbl