دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (KB) a special device placed around the kelly that mates with the kelly flats and fits into the master bushing of the rotary table. The kelly bushing is designed so that the kelly is free to move up or down through it. The bottom of the bushing may be shaped to fit the opening in the master bushing or it may have pins that fit into the master bushing. In either case, when the kelly bushing is inserted into the master bushing and the master bushing is turned, the kelly bushing also turns. Since the kelly bushing fits onto the kelly, the kelly turns, and since the kelly is made up to the drill stem, the drill stem turns. Also called the drive bushing. See kelly, master bushing.

n: a device that fits into the rotary table through which the kelly passes,the rotation of the table is transmitted via the kelly bushing to the kelly itself,sometimes called the drive bushing.

the bushing that directly transmits torque from the rotary table to the kelly.