Internal protection of well casing

Details Internal protection of well casing Internal protection of well casing

1977-12-15

1979-08-14

Leppink, James A.

Wells

Combined

166 65R, E21B 4300

Patent

active

041642570

ABSTRACT:
In a water injection well, in place of corrosion inhibitors, the internal surface of a lower section of the casing is protected from corrosion by one or more galvanic sacrificial anodes placed in the section of casing. The anodes are mounted on a metal member which is connected to or suspended from the tubing or a well packer. The metal member extends below a certain point in the well into the section of casing. The metal member may be a tail pipe or it may be a wireline retrievable member specially prepared for this purpose. Anodes made of an aluminum alloy are especially suited to this corrosion protection system.

REFERENCES:
patent: 1804078 (1931-05-01), Baden
patent: 2810440 (1957-10-01), Kenneday et al.
patent: 3497443 (1970-02-01), Von Burgsdorff
patent: 3497444 (1970-02-01), Paiton
patent: 3768563 (1973-10-01), Blount
patent: 3769521 (1973-10-01), Caldwell et al.
patent: 3818996 (1974-06-01), McCaleb

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