DEVICE FOR PULSE INJECTION OF LIQUID TO RESERVOIR Russian patent published in 2015 - IPC E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: device for pulse injection of liquid into a reservoir includes case, sleeve with central duct, positioned concentrically in the case, and process constriction in the form of removable bushing in the central sleeve duct. The case is installed on the sleeve on ball bearings. The sleeve features top and bottom rows of radial orifices with check valve placed between the orifices inside the sleeve and allowing for a flow upwards from below. Top and bottom rows of radial orifices are interconnected by a bypass duct between the case and the sleeve. The bypass duct features tangential vanes on the inner case surface, ensuring case rotation against the sleeve and partially overlapping and changing flow area of the bottom row of radial sleeve orifices by a ring featuring a row of through orifices. The ring is mounted outside of the sleeve opposite to the bottom row of radial sleeve orifices and is attached rigidly to the case. Removable bushing is installed in the central duct at the lower sleeve end.

EFFECT: higher reliability of operation.

3 dwg