METHOD OF ACOUSTIC IMPACT ON WELL Russian patent published in 2019 - IPC E21B43/25 E21B28/00 E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, can be used to increase flow rate of non-productive wells and for rehabilitation of wells considered to be unpromising. Method of acoustic impact on well is carried out by means of two borehole acoustic radiators with diameter of not more than 35 mm, installed along common axis at distance not exceeding one wavelength of sound in borehole fluid. Radiating surfaces of both emitters are directed towards each other. At that, resonant frequency and Q-factor of each radiator, which correspond to well conditions, are determined. Amplitude-frequency characteristics of each emitter are recorded. In the space between the emitters, a total acoustic field with frequency fb equal to f1-f2 is formed, where f1 and f2 are operating frequencies of the first and second acoustic field radiators, respectively. Value fb is maintained up to 4 kHz with the possibility of its change in the given range due to possibility of adjustment of the working frequency of each radiator within its amplitude-frequency characteristic without reduction of radiated power below half of the resonant one. Working frequency of each radiator is selected in range of 18 to 22 kHz.

EFFECT: higher efficiency of acoustic impact on well and expansion of method functionality.

4 cl, 3 dwg