| 摘要 |
The subject matter of this specification can be embodied in, among other things, a method that includes providing an outer tubular member having a bore with an inner surface, applying a lubricant layer to at least a portion of the inner surface of the outer tubular member, positioning the outer tubular member in at least a portion of the wellbore, providing a drilling assembly including an inner member having an outer surface, applying a lubricant layer to at least a portion of the outer surface of the inner member, inserting the inner member into the bore of the outer tubular member, providing a drilling fluid through the bore of the drilling assembly, rotating the inner member relative to the outer member, measuring an indicator of mechanical wear between the outer member and the inner member, determining that the measured indicator exceeds a predetermined threshold level, and triggering a subsequent operation. |
