Wellbore cathodic protection

Details Wellbore cathodic protection Wellbore cathodic protection

1982-05-07

1983-11-08

Novosad, Stephen J.

Wells

Processes

Electric current or electrical wave energy through earth for...

166DIG1, E21B 4102, E21B 3604

Patent

active

044136790

ABSTRACT:
A method for the cathodic protection of metal conduit in a wellbore in permafrost wherein a predetermined electric current is impressed between said conduit and an anode, the improvement comprising setting said anode in the permafrost away from the wellbore a distance which is greater than the distance between the bottom of the anode and the bottom of the permafrost, and increasing the voltage sufficiently to match the increased resistivity of the permafrost to thereby maintain the predetermined current between the wellbore and anode.

REFERENCES:
patent: 3757860 (1973-09-01), Pritchett
patent: 3766980 (1973-10-01), Kern

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