Expandable centralizer for expandable pipe string

A method, comprising:

• positioning a centralizer on a pipe string, the centralizer comprising:
• a collar configured to be disposed about the pipe string, the collar being configured to expand in circumference, without plastically deforming, when the pipe string is expanded;
• and
• a plurality of ribs extending from the collar and configured to provide a standoff between the pipe string and an interior wall of the wellbore;
• circumferentially expanding the collar, without plastically deforming the collar, by plastically deforming the pipe string, wherein circumferentially expanding the collar comprises circumferentially sliding first and second arcuate links of the collar circumferentially relative one another.

A method, comprising:

• positioning a centralizer on a pipe string, the centralizer comprising:
• a collar configured to be disposed about the pipe string, the collar being configured to expand in circumference, without plastically deforming, when the pipe string is expanded;
• and
• a plurality of ribs extending from the collar and configured to provide a standoff between the pipe string and an interior wall of the wellbore;
• circumferentially expanding the collar, without plastically deforming the collar, by plastically deforming the pipe string;
• and
• engaging an interior wall of a borehole with the plurality of ribs coupled to the collar, to centralize the pipe string, at least after plastically deforming the pipe string, wherein engaging the interior wall of the borehole with the plurality of ribs comprises breaking a coupling between two or more fins, the two or more fins being coupled to at least some of the plurality of ribs.