Patent ID: 7249632

Claim:
A top drive swivel insertable into a drill or work string comprising: (a) a mandrel having upper and lower end sections and connected to and rotatable with upper and lower drill or work string sections, the mandrel including a longitudinal passage forming a continuation of a passage in the drill or work string sections; (b) a sleeve having a longitudinal sleeve passage, the sleeve being rotatably connected to the mandrel by a pair of longitudinally spaced bearings; (c) a seal between upper and lower end portions of the mandrel and sleeve, the seal preventing leakage of fluid between the mandrel and sleeve; (d) the sleeve comprising an inlet port positioned between the spaced bearings; and (e) the mandrel comprising a plurality of longitudinally spaced apart radial ports in fluid communication with both the inlet port and the longitudinal passage to supply pressurized fluid from the inlet port to the longitudinal passage and in the passage in drill or work string, wherein the mandrel further comprises a shoulder and a retaining nut threadably engaging the mandrel, the shoulder and retaining nut being spaced apart, the sleeve being positioned between the spaced apart shoulder and retaining nut, the retaining nut further comprises a lubrication port; the lubrication port being positioned to lubricate at least one of the spaced bearings.