دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

base Kelly bushing.

n: any numerical or geometrical quantity or quantities that serve as a reference or base for other quantities.

a relative comparison point, such as the Kelly bushing, sea level or mud line.

n: see deviation.

n: One of the coordinates used to plot the path of the well on the horizontal plane (alone the x axis).

the distance from the kelly bushing horizontally to the end of the well.

n: in a kelly bushing, a double set of roller assemblies that are installed on two levels, or planes, within the bushing. Compare single-plane roller assembly. See also kelly bushing, roller assembly.

n: see kelly bushing.

n: refer tokelly bushing

n pi: see kelly bushing rollers. drive shaft n: in a top drive, d1e shaft that comes out of the drives drilling motor. Usually, crew members attach a saver sub (a short pipe fitting) to the drive shaft and attach the top joint of drill pipe to the sub. The drive shaft transmits the motors rotating fon:e to the drill string and bit. See top drive.

n: refer tokelly bushing rollers

n: a kelly bushing that has four steel dowels. or pins. that fit into corresponding holes in the master bushing. When the pins are engaged with the holes. the rotating master bushing also turns the kelly bushing. which then turns the kelly and the drill stem. See kelly, kelly bushing, master bushing.

n: a master bushing that has four holes symmetrically positioned on its outside perimeter and into which fit four corresponding steel dowels. or pins. on the kelly bushing. When the pins are engaged into the holes and the master bushing turns. the kelly bushing also turns. See kelly bushing, master bushing.

abbr: kelly bushing;used in drilling reports.

Kelly bushing on a rig with a rotary table. A depth datum.

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.