MONITORING DRILLING PERFORMANCE IN A SUB-BASED UNIT

摘要

In one aspect, a removable module or sub is provided for use in drilling a wellbore, which sub in one embodiment may include a body having a pin end and a box end configured for coupling between two members of a drill string, the body having a bore therethrough for flow of a fluid, and a sensor disposed in a pressure-sealed chamber in one of the pin end and the box end and configured to provide measurements relating to a downhole condition.