FIELD: oil-producing and other industries; cathode protection of lowered into the well equipment.
SUBSTANCE: the invention is pertaining to the devices for cathode protection of the downhole equipment against corrosion and may be used by various industries. The device for the cathode protection of lowered into the well equipment includes a station of the cathode protection connected by a cable on a daylight surface to the casing string and to the oil-well tubing string and also to the anodic earth lead and to the equipment lowered into the well. Additionally the device includes an electric contact of the lowered into the well equipment to the casing string. The invention ensures an increased efficiency of the device for the cathode protection of the lowered into the well equipment in the all classes of the boreholes, due to complete exclusion of a capability of the casing string electrochemical corrosion.
EFFECT: the invention ensures an increased efficiency of the device for the cathode protection of the lowered into the well equipment in the all classes of the boreholes.
3 cl, 1 dwg
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