WELL PRODUCTIVITY RECOVERY METHOD Russian patent published in 2015 - IPC E21B37/08 

FIELD: oil and gas industry.

SUBSTANCE: method includes usage of additional well with strainer and electrode of electroconductive material placed at distance from 10m up to 100m form the first well with electrode and strainer placed in it with formation of water-bearing electroconductive formation. The wells are connected to a power supply force represented by combined direct-current generator and alternating-pulse generator. Electric current is supplied through the formed electric circuit from the power supply source to electrode and strainer of the first well, water-bearing formation, strainer and electrode of the auxiliary well for cleaning strainers from colmatant. The electrode of the first well strainer serves as anode while electrode of the auxiliary well strainer serves as cathode. Electrodes are connected additionally to the source of alternating-sign electric pulses and alternating-sign pulses are supplied to them with frequency of 20 - 100Hz for alternate change and shift of pH medium towards reduction in the strainer area. The method excludes formation of non-soluble ferroferrihydrosol complex in the water-bearing formation adjoining strainers and in strainers directly.

EFFECT: improved efficiency of treatment from deposits that promotes recovery of productivity.

1 dwg