METHOD FOR RECOVERY OF DRY OIL AND GAS WELLS Russian patent published in 1996 - IPC

FIELD: and gas production; applicable in increased oil recovery from formation with the use of migration geoeffect and cavitation. SUBSTANCE: used as vibration source is external surface of casing string to which layer of rare-earth element is applied. Electrodes are installed into the layer and connected to the source of exciting voltage, and powerful vibrations are excited in the selected range in combination with injection into the formation of loosening solution heated up to 180 C. Then, pulse hydraulic fracture is made and cavitation phenomena are initiated in the formation to increase formation permeability and oil recovery. Working fluid is used in form of heated solution of sodium hydroxide or sodium hydroxide with methane and 3-5% surfactant. EFFECT: higher oil recovery from formation. 6 cl, 1 dwg