METHOD OF CHEMICAL INJECTION IN WELL AND RELATED DEVICE FOR IMPLEMENTATION THEREOF Russian patent published in 2010 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions concerns oil industry, particularly technology and technique of chemical injection. In implementing the method, in a well there is mounted a proportioning unit with a cavity filled with a chemical; through a proportioning unit, the chemical is injected under excess pressure in the well medium to be exhausted with a deep-well pump. In the cavity of the proportioning unit, there is an adjusted excess pressure generated by connecting thereto an output of the deep-well pump or a pipeline connected thereto behind the output of the deep-well pump. The connection is ensured through a tube or a channel in the pipe or an aperture in the device with a reduction valve, and the chemical is separated from the medium from the outside of the pump output with the piston. The chemical is injected by squeezing with the piston under excess pressure and substitution of the chemical with the well medium from the pump output supplied to the proportioning unit by the connective tube, channel or aperture in the device.

EFFECT: higher efficiency of proportioning and longer operation life of the well, lower consumption of the chemical.

5 cl, 1 dwg