METHOD FOR CATHODE PROTECTION OF ELECTRICAL CENTRIFUGAL WELL PUMP AND APPARATUS FOR PERFORMING THE SAME Russian patent published in 2003 - IPC

FIELD: methods and apparatuses for protecting well and deep well equipment such as electrical centrifugal pumps against corrosion due to applying controlled potential difference (cathode protection), possibly in different branches of industry, particularly in oil production industry branches. SUBSTANCE: method and apparatus for cathode protection of electrical centrifugal pump descended in well provide applying of potential difference between point of cable connection on day surface to casing and anode ground and in addition applying potential difference between electrical centrifugal pump and anode ground in such a way that it is applied through point of cable connection on day surface to casing. EFFECT: enhanced efficiency of method without reducing it as electrical centrifugal pump removes from said day surface. 4 cl, 1 dwg, 2 tbl, 3 ex