METHOD AND DEVICE OF JET COMBINED PARAMETRICAL GUN FOR PRESSURE WAVES GENERATING AND MODULATING IN THE INJECTION WELL HOLE Russian patent published in 2018 - IPC E21B43/25 E21B28/00 E21B43/16 F15B21/12 

FIELD: oil and gas industry.

SUBSTANCE: method of pressure waves generating and modulating in the injection well hole, in which the combined acoustic oscillation system, consisting of two combined acoustic oscillation systems, is assembled. At that the external acoustic oscillation system is the jet Helmholtz resonator and includes the inlet nozzle, the chamber-resonator and the exhaust channel. The internal acoustic oscillation system is the Galton whistle and includes the inlet nozzle and the sleeve-resonator. Moreover, both acoustic oscillation systems are excited simultaneously by the single gas jet, supplied from the common ring nozzle to the sharp entrance edges of the exhaust channel and the sleeve-resonator, respectively. The ring nozzle is connected to the oil-well tubing channel, and the gas is supplied into the well through it, the gas jet is formed behind the ring nozzle and it is directed to the sharp inlet edges of the exhaust channel and the sleeve-resonator. Generate the pressure oscillations on the sharp inlet edges of the exhaust channel and intensify its amplitude in the chamber-resonator. Generate the high-frequency pressure oscillations at the sharp inlet edges of the sleeve-resonator and intensify its amplitude in the sleeve-resonator. Generate the low-frequency pressure oscillations at the sharp inlet edges of the exhaust channel and intensify its amplitude in the chamber-resonator. The wave packet, containing the high and low frequency pressure waves is formed at the outlet from the combined acoustic oscillation system, perform its mutual modulating with formation of difference frequency wave, the amplitude of which is amplified beyond the exhaust channel and directed to the reservoir bottomhole region through the perforations in the casing pipe.

EFFECT: increase of the fluid mobility in the reservoir bottomhole region and enhance of the mechanical effect to the solid deposits.

2 cl, 1 dwg