Method for well remediation and repair

A method of remediation of a well including a wellbore having a wellbore casing extending therethrough, the casing having a casing bore, the method comprising:

• conveying a casing expanding tool downhole to at least one expansion location along the casing, wherein the at least one expansion location comprises at least one uphole expansion location uphole of a target interval, and at least one downhole expansion location downhole of the target interval, wherein one or more of the at least one expansion location is located at a portion of the casing having a cement sheath thereabout, the target interval including one or more leak paths formed in an annulus defined between the casing and the wellbore;
• actuating the casing expanding tool to plastically deform the casing radially outward at the at least one expansion location, wherein plastically deforming the casing radially outward comprises compressing the cement sheath to compact the cement of the cement sheath at the at least one expansion location;
• and
• introducing sealant into the annulus via one or more perforations formed through the casing within the target interval.

A method of mitigating communication between a first subterranean formation and a second subterranean formation of a wellbore, the method comprising:

• conveying a casing expanding tool downhole on a conveyance string to at least one expansion location along a wellbore casing located intermediate the first and second subterranean formations, the at least one expansion location being proximate to one or more leak paths in the annulus between the casing and the wellbore;
• and
• actuating the casing expanding tool to plastically deform the casing radially outward at the at least one expansion location, thereby restricting or blocking fluid flow through the one or more leak paths,
• wherein one or more of the at least one expansion location is located at a portion of the casing having a cement sheath thereabout, such that plastically deforming the casing radially outward further comprises compressing the cement sheath to compact the cement.