دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the place at each end of the drawworks drum where the drilling line being spooled onto or off of the drum stops moving in one direction and starts moving in the other direction. Also called turn back. crossover joint n: a length of casing with one thread on the field end and a different thread in the coupling, used to make a changeover from one thread to anod1er in a string of casing.

n: A sub that is used to connect drill string components that have different threads or sizes.