Patent ID: 8146663
Filing Date: 2012-04-03
Classification: E21B,F16J,F16L

Abstract:
1. 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 pair of spaced apart packing units between upper and lower end portions of the mandrel and sleeve, the packing units preventing leakage of fluid between the mandrel and sleeve; (d) the sleeve comprising an inlet port positioned between the spaced bearings; (e) the mandrel comprising a plurality of 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 sections; and (f) wherein each of the packing units comprise a plurality of packing rings, at least one packing ring in each packing unit being comprised of a non-rope seal and being spaced close to a rope seal.