IMPLOSION-HYDROPULSE DEVICE FOR STIMULATION OF WELL PRODUCTIVITY Russian patent published in 2012 - IPC E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: device includes cover plate, bottom and composite tubular housing of implosion chamber. Upper end of chamber is attached at least to one single-sided hydraulic cylinder consisting of connecting head and bottom with seals, guide stock, one-piece rod, sleeve with side drain channels of small section and power piston tightly separating the stock and piston cavities of the sleeve. Drain channels are made below the head with possibility of their disconnection from piston cavity by means of power piston in its upper position. Flow-through openings are provided between drain channels and upper edge of drain piston in its lower position. Guide stock is hollow and has the possibility of being connected to piston cavity; one-piece rod is rigidly attached through bottom of hydraulic cylinder to cover plate of implosion chamber; at that, cover plate is arranged in housing of implosion chamber and made in the form of piston with cup-type seals. In the housing wall above cover plate in its lower position there provided are bypass openings and inlet openings; at that, bypass openings are arranged in upper part of the housing, and inlet openings and flow-through openings of sleeve have the possibility of their alternative actuation at movement of power piston from lower to upper positions. Bottom of implosion chamber is rigidly attached to reducer for attachment of tubular shank with a plug; at that, one flow-through channel equipped with seals is provided at the bottom and in the reducer. In housing of implosion chamber above the cover plate there arranged is elastic return element. Cover plate of implosion chamber is provided with a sleeve dividing the implosion chamber into sections at tight contact with seals in the through channel of the bottom. Flow-through openings of sleeve are equipped with water jet and cavitation head pieces. Upper part of shank is provided with shutoff-filling assembly.

EFFECT: enlarging the set of hydrodynamic effects implemented in the well against productive formation per one rising-and-lowering operation at simplifying the design and improving the device operating reliability.

6 cl, 4 dwg