1. adj. [Formation Evaluation]

Describing sensors that are embedded in drill collars in order to record measurements while drilling.

See: drill collar,  logging tool,  telemetry

2. adj. [Formation Evaluation]

Pertaining to the use of drillpipe to move wireline logging tools up and down a borehole. In difficult conditions—high well deviation, rough hole—wireline logging tools cannot reach the bottom of the hole under their own weight. In drillpipe-conveyed logging operations, the tools are moved mechanically by the drillpipe while a wireline maintains the electrical connection.

See: cable