CHEMICAL SUPPLY DEVICE Russian patent published in 2022 - IPC E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, in particular to downhole equipment, and can be used to supply chemicals to a tubing string. The chemical reagent supply device comprises a cylindrical housing provided with an external thread in the lower part, spring-loaded upper and lower check valves installed in the cylindrical housing. To check the tightness of the chemical reagent supply line, a bursting element is installed in the cylindrical body, blocking the passage channel of the cylindrical body. The upper check valve contains a bushing installed with the ability to control the compression force of the upper check valve spring by means of its axial movement along the thread of the cylindrical body. The cylindrical body is placed in the outer longitudinal groove of the protective body, in which, below the longitudinal groove, there is a longitudinal hole for screwing in the cylindrical body, which communicates through the side opening of the protective body with its internal cavity.

EFFECT: increasing the reliability of the device for supplying a chemical reagent due to the exclusion of falling shear parts from entering the check valve, the possibility of regulating the opening pressure of the upper check valve and protecting the device when it is lowered into the well.

1 cl, 2 dwg