DEVICE FOR CYCLIC FLUID INJECTION AND FORMATION DEVELOPMENT Russian patent published in 2024 - IPC E21B43/18 E21B34/06 

FIELD: mining.

SUBSTANCE: invention relates to a device for cyclic fluid injection and formation development. Device includes housing, concentrically located in housing branch pipe with central channel, openings and nut, spring, replaceable bushing. Nut is installed on the outer surface of the branch pipe in its upper part. Spring is installed between the nut and the housing in which the internal cylindrical recess is made. In the lower part of the internal cylindrical recess of the housing there are radial channels. Hollow cylindrical valve is rigidly attached to the branch pipe inserted into the housing from below. Cavity of the internal cylindrical recess of the housing above the annular projection of the cylindrical valve is interconnected with the central channel through openings. Cavity of the internal cylindrical recess under the projection is interconnected by radial channels with the space outside the housing, and the hollow cylindrical valve below the internal cylindrical recess of the housing is equipped with radial openings. Below the radial openings, the cylindrical valve is equipped with a replaceable bushing. Blind rod is installed in the replaceable bushing. Blind rod is rigidly connected to replaceable bushing with height a. In the hollow cylindrical valve above the replaceable bushing there is an internal cylindrical recess with height b, b>a. A plug fixed with a shear pin is installed in the hollow cylindrical valve below the replaceable bushing. Blind rod with replaceable bushing has the possibility of limited reciprocating axial movements together with the housing relative to the hollow cylindrical valve with possibility of cyclic opening and closing of inner cylindrical recess of hollow cylindrical valve for liquid overflow. From above the housing is equipped with a branch pipe with perforated holes. Inside the branch pipe opposite the perforated holes there is a hollow bushing with inner diameter D, which tightly covers the perforated holes with diameter d of the branch pipe, and is fixed with a shear screw relative to the branch pipe. Following ratio must be observed: Σs/k=S, where Σs is the total area of the perforated hole with diameter d of the branch pipe, m²; k is the development efficiency factor, taking into account the reduction of the throughput capacity (narrowing) of the perforated holes d of the branch pipe during the well development, k=1.5 and is determined experimentally; S is cross-sectional area of hollow bushing with inner diameter D, m². Hollow bushing is equipped from below with external annular groove, and from above with mounting seat for three-stage rubber plug. Diameter D₁ of the upper stage of the three-stage rubber plug is equal to inner diameter d₁ of the pipe string. Diameter D₂ of middle stage of three-stage rubber plug is 1.05 times more than diameter D of hollow bushing. Diameter D₃ of the lower stage of the three-stage rubber plug is 0.8 times less than the diameter D of the hollow bushing. From below the branch pipe is equipped with an internal annular projection. Above the inner annular projection there is an inner cylindrical groove, in which a split spring ring is placed, having the possibility of fixation in the outer annular groove of the hollow bushing.

EFFECT: increased reliability of device operation, improved quality of cyclic injection of liquid into formation, also expansion of technological capabilities in application due to possibility of fluid swabbing from formation after cyclic injection, as well as elimination of harm caused to environment.

1 cl, 3 dwg