METHOD AND DEVICE FOR EXCITEMENT OF WAVE FIELD ON INJECTION WELL FACE Russian patent published in 2015 - IPC E21B43/25 E21B28/00 E21B43/16 F15B21/12 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil producing industry and intended for improvement of oil recovery of productive formations. The method of excitement of wave field on the injection well face consists in that the flat constrained flow of liquid is supplied continuously from the slot-hole nozzle to the wedge nose. Meanwhile the area of primary generation of vortex structures in the zone behind the nozzle cut edge is formed. Periodic breakdown of ring vortex structures from the nozzle cut edge, their movement with flow and impact with the wedge nose are provided. Pressure disturbances are generated at deformation and destruction of vortex structures on the wedge nose. Propagation of periodic pressure disturbances from the wedge nose extensively in the form of elastic waves and their chaotic reflection from surrounding walls is performed. The excitation by energy of multiple vortex structures due to energy of elastic oscillations achieving primary generation area is conducted. The liquid flow on the wedge nose is deflected to one of two diverging outlet channels. The flow is divided at the inlet upstream the output channel and sent partially to the lateral chamber interfaced with the nozzle edge and the output channel. In the chamber the pressure is increased due to piston effect of the supplied flow and the flow is pushed away to the opposite output channel, formed from two of its sides by the pressure difference. Periodic switching of the liquid flow direction between output channels is provided. The liquid is displaced alternately from the diverging channels into the common punched output collector. The field of elastic oscillations is excite on the injection well face. Thus the elastic waves reflected from walls of each chamber are focused on the nozzle cut edge interfaced to it.

EFFECT: improvement of efficiency of conversion of kinetic energy of the flow to oscillatory energy of the wave field.

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