METHOD AND DEVICE OF JET PARAMETRICAL GUN WITH TWO TOROIDAL CHAMBERS FOR PRESSURE WAVES GENERATING AND MODULATING IN THE INJECTION WELL HOLE Russian patent published in 2017 - IPC E21B43/25 E21B28/00 F15B21/12 B06B1/20 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is designed for the casing walls and perforations cleaning from solid deposits, decolmatation of the bottomhole formation region (BFR) and increase of formation fluids mobility. The method of the pressure waves generating and modulating in the injection well hole, in which: the jet gun is used. The gun consists of the ring channel with sharp edges on the outer and inner walls and combined with the channel of external and internal toroidal-shaped swirl resonance chambers (TSRC). TSRC are made on the walls of the channel and represent two independent acoustic oscillating systems, which are excited, when the gas flow is leaking on the sharp edges, made to meet the flow, in which both TSRC serve as the resonators. Arrange the gas flow in the ring channel. Generate the primary oscillations of small amplitude pressure in the local region near the sharp edges, when the gas flow is leaking on them. Deviate the nearwall parts of the flow inside both TSRC and intensify the amplitude of the primary pressure oscillations in both TSRC, which natural oscillation frequency is tuned into the resonance with the generation frequency of the primary pressure oscillations at the corresponding sharp edge. Pressure waves are formed in the gas flow inside the channel. Moreover, the primary pressure oscillations of different frequencies are generated on the external and internal sharp edges and intensify its amplitude in the corresponding TSRC, and additional volume resonance chamber is installed at the output from the channel. In this case, primary low-frequency pressure oscillations are generated on the external sharp edge and intensify its amplitude in the external TSRC, and on the inner sharp edge the primary high-frequency pressure oscillations are generated and intensify its amplitude in the internal TSRC. Thus, two acoustic waves of low and high frequencies are formed in the channel, which during interaction and mutual modulation, create the beat mode in the channel and form the wave packet in the channel, containing along with the primary frequencies waves and the difference frequency wave, which amplitude is intensified in the additional volume resonance chamber at the output from the channel and then the pressure wave is directed into the injection well hole.

EFFECT: increase of fluid mobility in the injection well hole and enhance of mechanical effect on solid deposits.

3 cl, 1 dwg