Patent ID: 9745844
Date: 2017-08-29
CPC Classifications: E21B

Claim:
1. A method comprising: drilling a wellbore with a drill bit coupled to an end of a drill string extending into the wellbore, wherein a portion of the wellbore is lined with casing and the drill string includes a plurality of drill string sections each having a drill string wear factor; tracking a location of the plurality of drill string sections along the wellbore; analytically dividing progress of the drill bit into a plurality of drilling intervals, wherein each drilling interval has a depth; analytically dividing the casing into a plurality of casing sections, wherein each casing section has a length; corresponding at least some of the plurality of casing sections with the drill string wear factor of the drill string section radially proximate to each of the plurality of casing sections for at least some of the plurality of drilling intervals; and calculating a drilling casing wear for at least one of the plurality of casing sections based on the drill string wear factors corresponding to the at least one of the plurality of casing sections.