Patent ID: 7926594
Filing Date: 2011-04-19
Classification: E21B

Abstract:
1. A bearing assembly for a well drilling head, comprising: an outer barrel having a central bore; an inner barrel at least partially disposed within the central bore of the outer barrel, wherein the inner barrel includes a central bore and a plurality of cooling structures protruding from a surface thereof within the central bore, wherein said cooling structures have direct exposure to the central bore, wherein said coding structures are formed directly within the surface of the inner barrel within the central bore, wherein a single piece of material of the inner barrel has said cooling structures formed directly therein, and wherein each one of said cooling structures extends at least partially around a circumference of the inner barrel central bore; and bearing units coupled between said barrels for providing concentric alignment of said barrels and allowing rotation therebetween, wherein each one of said bearing units is seated directly on the single piece of material.