| 摘要 |
The invention is directed to a coiled tubing swivel for rotatably connecti ng a first conduit to a second conduit. The swivel comprises a swivel body havi ng a cylindrical receptacle and a flowpath that communicates between the receptac le and the first conduit, a tubular mandrel having a first end that is received within the receptacle and a second end which communicates with the second conduit, and a bearing assembly positioned between the receptacle and the mandrel. The bearing assembly includes a central axis, a cylindrical outer sleeve having an inner surface and a number of annular inner grooves which are formed on t he inner surface coaxially with the central axis, and a cylindrical inner sleev e having an outer surface and a number of annular outer grooves which are formed on t he outer surface coaxially with the central axis. The outer grooves align with respective inner grooves to define a number of bearing races, and a pluralit y of balls are disposed in the bearing races to rotatably secure the inner sleeve to the outer sleeve. Moreover, each bearing race comprises a diameter which is smaller than the diameter of the adjacent bearing race that is closer to the first end of the mandrel. In addition, the swivel comprises a packing for sealing the bearing assembly from the flowpath in the swivelbody.
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