Influence of wear on casing strength
The burst, collapse and axial strengths of casing are directly related to wall thickness, and hence are reduced by wear. The casing must be designed so that wear will not reduce the strength of the casing below that which will enable the well to be drilled and operated safely and efficiently.
1 Introduction
Unless there is well documented evidence that wear is not a problem, the amount of wear should be monitored closely during the drilling of the well, so that if it becomes excessive appropriate action can be taken.