Subterranean barriers, methods, and apparatuses for forming, inspsecting, selectively heating, and repairing same

A method of selectively heating at least one casing string forming at least a portion of a barrier within a subterranean formation comprising a plurality of casing strings, wherein each of the plurality of casing strings is laterally adjacent to at least one other casing string of the plurality of casing strings, the method comprising:

• positioning a heating apparatus within a bore of a casing string forming at least a portion of a barrier adjacent a selected region of a subterranean formation, the barrier comprising a plurality of casing strings, wherein each of the plurality of casing strings is laterally adjacent to at least one other casing string of the plurality of casing strings;
• and
• selectively heating a portion of the casing string by operating the heating apparatus.

A method of forming a subterranean barrier adjacent a selected region of a subterranean formation, comprising:

• placing a plurality of casing strings within a subterranean formation, wherein each of the plurality of casing strings is laterally adjacent to at least one other casing string of the plurality of casing strings;
• and
• joining at least two laterally adjacent casing strings of the plurality of casing strings to one another by forming at least one adhesive joint substantially longitudinally along an interlocking structure formed between two adjacent casing strings.