PROCEDURE FOR ELECTRO-CHEMICAL TREATMENT OF PRESSURE WELLS Russian patent published in 2011 - IPC E21B43/16 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in lowering electrode-anode electrically connected with source of direct current in zone of pay, in connection of negative terminal of direct current source with casing string, in current source switching on and treatment of bottomhole zone of pay by transmission of direct electric current through pay water in well till production of water acidulous medium. Produced acidulous medium is pumped into the bottomhole zone of the pay for treatment of borehole environment. When a period of chemical reaction of acidulous medium with rock of the bottomhole zone of the pay has been completed, water column in the borehole of the well is changed and mud is carried over. Further, electric current is repeatedly transmitted through pay water in the well at a changed mode of electric treatment till there is produced water alkali medium. Water is pumped into the well while treatment with electric current is being continued for pumping alkali medium into depth of the pay and for production of fringe of water alkali medium in the pay.

EFFECT: raised efficiency and oil extraction.

1 dwg