COMPOSITION FOR TREATMENT OF BOTTOM-HOLE ZONE OF CARBONATE RESERVOIR Russian patent published in 2020 - IPC C09K8/74 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the oil-producing industry. Composition for treatment of bottom-hole zone of carbonate reservoir includes, wt. %: Trilon-B 4.8–10.0; alpha olefin sulphonate AOC 0.2–0.5; ferric chloride FeCl₃ 0.01–0.03; water of any mineralization from 1 to 300 g/l - the rest. Components of trilon-B, AOC, iron chloride composition are powdery and are used for further mixing with water at following ratio of powder components, wt. %: trilon-B 95.0–95.8; AOC 4.0–4.7; ferric chloride FeCl₃ 0.2–0.3.

EFFECT: technical result is increase of intake capacity of injection wells and intensification of fluid influx from productive formation with carbonate reservoirs, prolonged action of composition for treatment of bottom-hole zone, dispersion of clay drilling cake, removal of insoluble products of reaction of hydrochloric acid with rock, cleaning of bottomhole zone of wells after acid hydraulic fracturing of formation, formation of multichannel structures of dissolution and increase of conductivity of natural cracks, selective effect of composition on formation.

3 cl, 5 tbl, 3 ex, 1 dwg