1. Restoring force--force exerted by a Casing Centralizer against the casing to keep it away from the wellbore wall.

2. Running force--maximum force required to move a casing centralizer through a specified wellbore diameter.

3. Standoff--smallest distance between the outside diameter of the casing and the wellbore.

4. Standoff ratio--ratio of standoff to annular clearance.

5. Starting force--maximum force required to insert a centralizer into a specified wellbore diameter.

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