METHOD AND DEVICE FOR WAVE FIELD GENERATION AT INJECTOR BOTTOMHOLE WITH PERMANENT RATE OF GENERATION AT CHANGEABLE FORMATION PRESSURE Russian patent published in 2015 - IPC E21B43/25 E21B28/00 B06B1/20 F15B21/12 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil producing industry and intended for improvement of oil recovery of the productive formations. The invention represents the method for wave field generation at the injector bottomhole with permanent rate of generation and adjustment of Helmholtz flow resonator for maintenance of fixed rate of pressure fluctuations in the liquid flow injected to the formation at changed formation pressure. The method lies in automatic adjustment of the flow section area for output opening in compliance with changes of formation pressure. It is required to maintain the permanent rate of the flow at the nozzle cut defining generation frequency to ensure a stable high amplification factor. The novelty lies in the unit in the output opening of Helmholtz flow resonator of the movable conical slide valve with hydraulic drive ensuring automatic movement of the valve at change in pressure drop at the device.

EFFECT: improved efficiency of permanent tone frequency maintenance at the opening.

3 cl, 1 dwg