FIELD: oil and gas extractive industry.
SUBSTANCE: method includes full raising of cement in behind-pipe space up to mouth, sectioning wells by electro-isolating compounds from oil transporting system or bed pressure support system and use of cathode protection plant as cathode protection station with current controller. For each well time needed for completing cathode polarization of well is determined as well as time for well depolarization, during which potentials on well of cluster are lowered to minimal protective values. On each cluster well cyclic mode of cathode protection plant is performed: cathode polarization during completion of cathode well polarization and well depolarization during lowering potential on well to minimal protective values. During depolarization of one well cathode polarization of other cluster well is performed.
EFFECT: higher effectiveness.
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