Abstract
Summary Four case studies show that laboratory simulations of casing wear caused by rotating tooljoint hardfacings correspond very well to field-measured casing wear. Moreover, the work reveals concentrations of casing wear at the kickoff point of a deviated well and near casing collars. Drillpipe/casing protectors do not always appear effective in avoiding casing wear. It is concluded that prediction of casing wear is possible with laboratory simulations, and that casing wear can be controlled by sufficiently smooth hardfacings, weighted mud, and moderate tooljoint/casing contact forces. An inspection technique can be used to qualify hardfacings for use in casing. Hardfacings that are machined to meet the smoothness requirement are commercially available.
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