HYDRAULIC PERCUSSION VALVE FOR PULSED INJECTION OF CHEMICALS INTO FORMATION Russian patent published in 2025 - IPC E21B34/10 E21B43/25 

FIELD: obtaining oil from wells.

SUBSTANCE: invention relates to devices for reagent-wave pulse treatment of bottomhole zone of oil wells in order to intensify oil inflow or water injection. Hydraulic percussion valve for pulsed injection of chemicals into a formation comprises two cylinders of different diameters with connecting threads, a plunger with a reciprocating drive arranged in a cylinder with a smaller diameter. Cylinders are made with telescopic joint. Cylinder with smaller diameter is made upper and contains coupling for connection to tubing string. Cylinder with a large diameter is made lower and contains a sub for connection with a packer-anchor unit. Ratio of diameters of upper and lower cylinders is equal to 1:1.2...1:1.4. Telescopic connection is made in the form of an upper adapter screwed on the inner thread of the lower cylinder and tightly fitted on the upper cylinder with a sliding fit along the outer diameter, and a lower adapter screwed on the outer thread of the upper cylinder with a sliding fit along the inner diameter of the lower cylinder with a thrust in the upper position on the upper adapter. Annular thrust seat is arranged in the sub of the lower cylinder. Plunger has a diameter equal to the inner diameter of the upper cylinder with a sliding fit. Bottom of the plunger is made in the form of a shell open from below with radial channels and fitting on a thrust seat. Stroke length of the telescopic joint provides for the plunger in the upper cylinder when the valve is closed. When the valve is open in the cavity of the lower cylinder, the top of the plunger contains a fishing head to be gripped by a catcher on the cable.

EFFECT: generation of hydropercussion pressure pulses on the formation by the pumped chemical reagent with hydraulic impacts of controlled amplitude and pulse duration without limitation of their quantity in continuous wave mode.

1 cl, 3 dwg