دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a feature on four-pin kelly bushings installed on floating offshore rigs (which employ a conventional rotary table assembly) that secures the kelly bushings pins to the master bushings corresponding drive holes so that the kelly bushing will not separate from (lift off of) the master bushing as the rig heaves up and down with wind and wave motion. See kelly bushing, master bushing.

n: see oil-bath air cleaner. oil-bath reservoir n: in rotary table assemblies, a compartment in the base of the rotary table assembly that contains oil of a specified weight and viscosity and through which parts of the assembly move to be lubricated.

n: notches or slots machined into the table part of a rotary table assembly into which a bar on the rotary table assemblys locking device fits to keep the table from turning. See rotary locking device, rotary table assembly.

n: a device that is set to open at a preset pressure to provide a point for excess pressure to exit to the atmosphere or to a suitable receptacle for later disposal. On tbe drive shaft of a rotary table assembly, for example, relief fittings are provided to unload excess grease in the shaft.

n: in a rotary table assembly, a circular, ring-shaped device with projections (teeth) that engage a beveled gear (a pinion) on the end of a drive shaft. The drive shaft is usually driven by a chain-and sprocket arrangement from the drawworks. When engaged, the drive shaft turns the pinion, which meshes with the ring gear, to turn the rotary table.

n: a chain drive powered by the draw works that drives the rotary table assembly;it runs from the drawworks sprocket to a drive-shaft sprocket. The driveshaft sprocket turns the drive-shaft assembly that drives the rotary table.

n: the principal piece of equipment in the rotary table assembly;a turning device used to impart rotational power to the drill stem while permitting vertical movement of the pipe for rotary drilling. The master bushing fits inside the opening of the rotary table;it turns the kelly bushing, which permits vertical movement of the kelly while the stem is turning. See kelly bushing, master bushing.

n: the main component of the rotating machine that turns the drill string .it has a bevelled gear meachanism to create the rotation,and an opening into which bushings are fitted.

the assembly of gears and connections that spins the kelly.

n: a rotating machine housed primarily inside a rectangular steel box with an opening in the middle for the kelly and the drill pipe that creates and transfers the turning motion for rotary drilling;parts of the assembly include the base, rotary table, master bushing, driveshaft assembly, drawworks sprockets, driveshaft sprockets, and locking devices.

n: a device similar to a power swivel that is used in place of the rotary table to turn the drill stem. It also includes power tongs. Modem top drives combine the elevator, the tongs, the swivel, and the hook. Even though the rotary table assembly is not used to rotate the drill stem and bit, the topdrive system retains it to provide a place to set the slips to suspend the drill stem when drilling stops.

a rig with the pipe rotation mechanism in the traveling block section. Usually does not use a Kelly.