A new method to design casing strings is based on predicted and actual wear of strings in the Tarim oil field, China. Casing wear during drilling reduces casing strength, especially collapse strength, ...

Conductor casing Conductor casing is the first string set below the structural casing (i.e., drive pipe or marine conductor run to protect loose near-surface formations and to enable circulation of ...

New equations for calculating the collapse strength of worn casing can aid future casing string design. During any drilling, it is inevitable that drill pipe rotation and tripping will cause casing ...