Downhole caliper system and method

A system, comprising:

• a tool string;
• a caliper assembly, comprising:
• one or more first calipers rotably coupled to the tool string, wherein the one or more first calipers are circumferentially arrayed about a longitudinal central axis of the tool string;
• one or more second calipers rotably coupled to the tool string, wherein the one or more second calipers are circumferentially arrayed about the longitudinal central axis;
• and
• a drive element disposed within the tool string and slidably coupled to the tool string;
• and
• a controller having a processor, wherein the controller is configured to:
• receive a first signal indicative of a first distance of a first extension of the one or more first calipers;
• and
• determine an estimated first distance of the first extension of the one or more first calipers based on the first signal;
• wherein the one or more first calipers are configured to extend from the tool string in response to the drive element moving to a first position;
• wherein the one or more second calipers are configured to extend from the tool string in response to the drive element moving to a second position.

A method, comprising:

• placing a tool string in a wellbore of a well;
• extending a plurality of first calipers from the tool string;
• lowering the tool string through the wellbore while the plurality of first calipers is extended;
• retracting the plurality of first calipers into the tool string;
• extending a plurality of second calipers from the tool string;
• and
• raising the tool string through the wellbore while the plurality of second calipers is extended.