GRAVITY-INERTIA FILTER FOR INSTALLATION OF ELECTRICALLY DRIVEN CENTRIFUGAL PUMP Russian patent published in 2020 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, namely to equipment of oil wells, and can be used in downhole equipment for filtration of well fluid from mechanical impurities to increase efficiency of oil production in complicated geological conditions and for cleaning of extracted fluid at ESP pump reception. Filter comprises filtering section. Section consists of a body and an internal pipe installed coaxially inside the body to form a cavity between the body and the pipe. Filter section comprises catch-slits. Catch-slits are installed in upper part of internal pipe, with cutouts directed counterclockwise. Filter section comprises a system of vortex blades arranged in the inner pipe. System of vortex blades is made in the form of three rows of vortex blades located in internal pipe at equidistant distances from each other. Swirler blades of each row of blade system are installed at angles to vertical axis of 10° or 20° and 30° and directed clockwise.

EFFECT: higher efficiency of extracted fluid cleaning and protection of pump working elements.

6 cl, 4 dwg