METHOD FOR INTENSIFYING OIL EXTRACTION FROM WELL Russian patent published in 2013 - IPC E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: method for intensifying the oil well from a well involves determination of well flow rate reduction dynamics, well shutdown and filling with working fluid on water basis. Additional holes are made opposite productive formation in perforated production string; acoustical action is performed on productive formation by generating elastic wave field of the ultrasonic frequency range in the well at perforation interval. After acoustical action is performed at the tubing lowered to the well and equipped with bottomhole means for working fluid flow energy conversion, reversing hydrodynamic action on productive formation is performed in addition. First, under conditions of extremely high flow rates of working fluid owing to creating instantaneous depression in the well opposite productive formation. Then, without any process pause, under conditions of oscillating flow of working fluid at perforation interval with emission of low-frequency oscillations to its flow. Oscillating flow of working fluid is performed in portions so that repression and depression per productive formation, which are adjustable as to the value, are alternated.

EFFECT: increasing the efficiency of ultrasonic action on well bore zone.