SELECTIVELY CORRODIBLE DOWNHOLE ARTICLE AND METHOD OF USE

• Main Authors: JOHNSON, MICHAEL H, MAZYAR, OLEG A
• Format: Patent
• Language: English
• Published: 09.10.2019

A selectively corrodible downhole article (10) includes a movable cylindrical member (12) comprising a first section and an axially separated second section (16), the first section (14) comprising a first material (18) having a first galvanic activity, the second section {16) comprising a second material (20) having a second galvanic activity, the first galvanic activity greater than the second, the first section (14) electrically isolated from the second section (16). The article also includes a fixed member disposed on the cylindrical member {12} and configured for electrical contact with the first or second section (16), the fixed member comprising an intermediate material having an intermediate galvanic activity, the intermediate galvanic activity intermediate the first and second galvanic activity, the movable cylindrical member (12) configured for movement from a first position where the first section (14) is disposed and in electrical contact with the fixed member and a second position where the second section (16) is disposed and in electrical contact with the fixed member. FIG. lA.