CAVITATION DEVICE FOR STIMULATION OF OIL RECOVERY OF FORMATIONS Russian patent published in 2020 - IPC E21B43/25 E21B28/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of oil and gas industry and is intended for solving tasks on recovery of reservoir properties of borehole zone of producing strata of producing oil and gas wells and involvement in development of hard-to-recover and unprofitable reserves of hydrocarbons, and can also be used for decolmatage of filters and pre-filtration zones of hydro-geological wells. Device comprises a hollow body and a bottom with external flanges, interconnected by screws, inlet cylindrical hole for injection of working fluid into it through filter-separator, flow turbulence promoter arranged in housing, annular confusor, as well as jet device in form of coaxially arranged on opposite ends of flanges of jet-forming ring elements, which change over to periphery in annular diffuser. At the same time annular elements are planar, and confuser has the form of conically convergent nozzle with outlet section, having smoothly expanding profile, conjugated with surface of annular element on housing flange. Inner surface of bottom is made in form of inlet cone concentrically arranged inside nozzle, which outer surface is made along generatrix, having the shape of concave line, smoothly mating with surface of annular element on bottom flange, wherein ring elements are located with axial gap relative to each other, forming exhaust channel with outlet critical section in form of circular slot.

EFFECT: reduction of hydraulic losses during operation, expansion of functional capabilities, as well as reduction of labor intensity and time consumption for production.

5 cl, 6 dwg