CHEMICAL REAGENT SUPPLY VALVE Russian patent published in 2019 - IPC E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to downhole equipment, and can be used for supply of chemical reagents to tubing string. Proposed device comprises cylindrical casing, spring-loaded main and auxiliary check valves, upper casing with through channel, retainer arranged in upper casing. Upper casing is connected with cylindrical casing. In the upper casing there are radial through channels communicating with the inner cavity of the cylindrical casing and covered with a plug placed in the passage channel of the upper casing and fixed in the upper position by means of a retainer, after cutting of which the plug moves into the lower part of the upper casing, thus communicating the passage channel of the upper casing with the inner cavity of the cylindrical casing. Auxiliary valve is arranged inside lower casing installed under main valve and connected with cylindrical casing. Lower housing is equipped with external thread for screwing into longitudinal hole made in casing of downhole equipment.

EFFECT: simplified design, possibility of making a valve for supply of chemical reagent in form of independent detachable device with placement of unit of check of tightness of supply line and possibility of its installation in annular space.

1 cl, 2 dwg