Options To Increase Drillstring Reliability and Decrease Tool Joint Break-in Cost

ABSTRACT The API NC type thread form has been available on tool joints and drill collars for about 20 years. It has an advantage over the previously used (and interchangable V.Q65) thread form because it has a full 0.038" (0.97 mm) radius at the thread root. The full root radius has a much lower str... View More