A dog-leg is a sharp change in the orientation of a well bore due to shifting azimuth and/or inclination.  Such shifts in a well orientation can make it difficult to run pipe and logging tools through an affected interval.  Borehole images drawn from dog-leg sections are often degraded due to hole enlargement, tool marking of the wall and the effects of any stick and pull that may arise from the problem of threading a tool string around what is essentially a corner.  Inspection of a well orientation survey will usually detail dog-leg severity, allowing its tie-in to image log quality.



←Return to glossary