دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the tool to bear the drill collar stem on the master bushing

n: downhole drill stem composed by drill caollars and other tools such as stabilizer and absorber

n: refer to drill collar stem

n: the drill collar stem without downhole tools which is larger than the diameter of the drill stem in the bottom

n: a tool above which joint on the middle of drill collar stem,its shape look like watermelon,its diameter is the same as the used hole,and it is also used to expand key slot in logging.