Nipple down
18 July 2017
Normal circulation
18 July 2017

Non-shearable

A non-shearable is normally accepted as a component of the drillstring: BHA or a large size casing string that cannot be sheared under expected wellbore conditions using current technology. The tool joints and upsets of the shearable drillpipe in use may also fall into the non-shearable category.