METHOD AND DEVICE FOR OIL RECOVERY INCREASE Russian patent published in 2007 - IPC E21B43/16 E21B28/00 

FIELD: oil and gas industry, particularly to increase marginal well production and to develop highly-viscous oil fields.

SUBSTANCE: method involves simultaneously applying ultrasound and heat to bottomhole formation zone by directing high-power ultrasonic radiation from land-based well part 4 to receiving well part 7 via casing pipes 5 of well 6 used as waveguide; scattering the radiation by casing pipe 8 perforation and well end 9 so that the radiation is partly converted into heat and partly emitted in bottomhole formation zone 2. Specific ultrasound power to be supplied in casing pipe 8 is within 0.1-10 kW/cm². Said action is applied during oil production without well disassembling and stoppage. Device for the method realization comprises electric oscillation generator 12 and magnetostrictor 13 made as nozzle put on casing pipe and arranged in land-based well part.

EFFECT: decreased oil viscosity, reduced paraffin and asphalt deposits in well and pipelines, extended and continuous action on oil bearing reservoir without oil production breakage and well disassembling for all operational time, improved well parameters and increased reservoir throughput.

6 cl, 1 dwg, 2 tbl