Patent ID: 8096711

Claim:
A lubricated sealed bearing assembly for a rotating flow diverter, the sealed bearing assembly adapted for sealing bearings from wellbore fluids under pressure, the sealed bearing assembly comprising: an outer housing and an axially rotatable inner cylindrical tubular adapted for the passage of other tubulars therethrough, forming an annular bearing assembly space therebetween; bearing elements positioned in the annular bearing assembly space, for radially and axially supporting the inner cylindrical tubular within the outer housing, the bearing elements having a lubricant under pressure; and a seal assembly positioned in the annular bearing assembly space, downhole from the bearing elements, isolating the bearing elements from the wellbore fluids, the seal assembly having: at least one sealing element further comprising an elastomeric body having an outer peripheral wall supported in the outer housing, an inner sealing surface adapted to engage the inner cylindrical tubular, and an annular cavity; an elastomeric loading ring for compressionally fitting within the annular cavity for providing a radial force to urge the body to expand radially inwardly to engage the inner sealing surface with the inner cylindrical tubular for sealing thereto; wherein the inner sealing surface further comprises a plurality of individual sealing lips; and wherein the individual sealing lips are of different diameters that are progressively from the sealing lip closest to the wellbore fluids to the sealing lip farthest away from the wellbore fluids.