METHOD OF CATHODE PROTECTION OF CASING STRINGS OF WELLS AND OIL-FIELD PIPELINES AGAINST CORROSION Russian patent published in 2017 - IPC C23F13/02 

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling holes to a depth greater than the length of the corresponding anode grounding electrode, drilling of each hole in interval of anode grounding deepening, setting a carpet, after completion of drilling, immediately before lowering the anode grounding electrodes in the hole, pumping up to upper level of clay solution mud and current-conducting colmatage solution, lowering anode grounding electrode, installing protective current on the casing string through cathode protection station, adjusting parameters of the cathode protection on the corresponding cathode cable. The holes are drilled at designed distance from casing strings of wells, groups of wells with similar design parameters are determined according to respective resistances, a corresponding common cathode cable is laid between each group of wells connected to the cathode protection station and in parallel with each of casing strings of wells, and wells with different resistances are provided with individual cathode cables with cathode protection station. The anode grounding electrodes are connected in parallel with a common anode cable which is connected to the cathode protection station, and the parameters of cathode protection on cathode cables by protective current are adjusted so that variation of parameters from average value does not exceed 10%.

EFFECT: servicing cathode protection facilities with different values of electric protection characteristics and simplification of protection currents adjustment.

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