Patent ID: 8500337

Claim:
A rotating flow diverter having a sealed bearing assembly adapted for sealing one or more bearings from wellbore fluid under pressure, the rotating flow diverter comprising: an outer housing and an inner tubular adapted for the passage of an additional tubular therethrough, said inner tubular axially rotatable in said outer housing and forming an annular space therebetween; and a sealed bearing assembly disposed in the annular space and having one or more bearing elements arranged and designed to radially and axially support said inner tubular within said outer housing, the one or more bearing elements in fluid communication with a lubricant under pressure; said sealed bearing assembly also having a seal assembly positioned downhole from said one or more bearing elements and arranged and designed to isolate said one or more bearing elements from the wellbore fluid, said seal assembly having at least two sealing elements with a seal interface between each sealing element, said seal assembly further having a fluid passageway between said outer housing and each seal interface, wherein another lubricant is in fluid communication with each seal interface.