DEVICE FOR PULSED INJECTION OF FLUID INTO BED Russian patent published in 2014 - IPC E21B43/18 E21B34/06 

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used for pulse injection of fluid into bed. Proposed device comprises case, concentric pipe with central channel arranged therein, openings, nuts and spring. Said nut is fitted on pipe outer surface at its top while spring if arranged between nut and case with inner cylindrical recess. Radial channel are made in lower part of the case cylindrical recess. Note here that hollow cylindrical valve equipped with circular ledge is fitted rigidly to the pipe fitted in the case to perform limited sealed displacement downward relative to inner cylindrical recess of the case. Case cylindrical recess above cylindrical valve circular ledge communicates via openings with central channel while inner cylindrical recess cavity above said ledge communicates via radial channels with the space outside the case. Besides, it has replaceable bush and stiff centring skid with stripping valve arranged atop said pipe. In compliance with this invention, hollow cylindrical valve below the case cylindrical recess is equipped with radial openings. Radial holes tightly stopped from inside by replaceable bush are arranged below radial openings in hollow cylindrical valve. From top, said replaceable bush is connected with the case by rod fitted in radial holes of said valve. Note here that hollow cylindrical valve is plugged from bottom while said case can perform restricted axial reciprocation along with replaceable bush relative to said valve at forcing the fluid in this device.

EFFECT: higher fluid flow rate at pulsed injection.

1 dwg