DEVICE FOR PULSED FLUID INJECTION AND RESERVOIR DEVELOPMENT Russian patent published in 2023 - IPC E21B43/18 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used when pumping liquid into a formation and subsequent development of the formation. A device for pulsed injection of liquid and development of a formation includes a housing, a pipe with a central channel, windows and a nut located concentrically in the housing, and a spring. The nut is installed on the outer surface of the pipe in its upper part, and the spring is installed between the nut and the housing, in which an internal cylindrical recess is made. The hollow cylindrical valve below the inner cylindrical part of the housing is equipped with radial windows; below the radial windows the cylindrical valve is equipped with a replaceable sleeve. A blind rod is installed in the replaceable sleeve, which is capable of limited reciprocating axial movements together with the housing relative to the replaceable sleeve with a hollow cylindrical valve. During operation of the device, when the upper part of the blind rod is located opposite the replaceable sleeve, the internal hole of the replaceable sleeve is hermetically sealed and there is no flow of liquid from top to bottom. And when the lower part of the blind rod is located opposite the replaceable bushing, the liquid is passed from top to bottom through the outer cylindrical recess of the blind rod. On top, the housing is equipped with a tube with perforated holes, while inside the tube, opposite the perforated holes, there is a hollow bushing that hermetically covers the perforated holes of the tube and is fixed with a shear screw relative to the tube. The hollow sleeve is equipped with an outer annular groove at the bottom, and at the top with a seat for a ball dropped from the wellhead into the device. The tube at the bottom is equipped with an internal annular protrusion, and above the inner annular protrusion there is an internal cylindrical groove in which a split spring ring is placed, which can be fixed in the outer annular groove of the hollow sleeve.

EFFECT: improved reliability of the device and eliminated pollution of the environment and the area around the wells.

1 cl, 3 dwg