Abstract:
In an aspect, a drilling motor is provided that in one embodiment includes a stator and a rotor configured to be disposed in the stator, wherein the rotor includes a lobe member having an elastically deformable surface configured to provide an interference seal between the stator and the rotor.
Abstract:
Downhole tool bearings are provided with diamond-enhanced materials. The diamond-enhanced materials comprise diamond grains in a matrix of tungsten or silicon carbide or a silicon-bonded diamond material. A brazed diamond grit or diamond particles coated with a reactive braze may be utilized for bearing applications. Bearing rings for use in downhole tools may be formed at least in part with the diamond-enhanced material. In one embodiment, the bearing rings may be used in a positive displacement motor. In additional embodiments, the bearing rings may be used in a submersible pump.
Abstract:
The present invention relates to a method and apparatus for forming a dynamic seal between two surfaces (136, 140). More specifically, the invention relates to creating a textured surface (166) with a thin, hard coating (176) on a metallic annular sealing ring (170) such as the sealing ring used in an earth boring drill bit (100).
Abstract:
A drill bit bearing having a treated surface and method for preparing the same is provided. The method includes the steps of polishing at least one contacting surface of the bearing with an abrasive paste to a finish of less than about 10 µin Ra. The surface of the polishing instrument has a coating that includes a mixture of an epoxy cement and a polymer.
Abstract:
Downhole tool bearings are provided with diamond-enhanced materials. The diamond-enhanced materials comprise diamond grains in a matrix of tungsten or silicon carbide or a silicon-bonded diamond material. A brazed diamond grit or diamond particles coated with a reactive braze may be utilized for bearing applications. Bearing rings for use in downhole tools may be formed at least in part with the diamond-enhanced material. In one embodiment, the bearing rings may be used in a positive displacement motor. In additional embodiments, the bearing rings may be used in a submersible pump.
Abstract:
A roller cone bit is provided that includes a wear resistant diamond-like carbon coating applied to a bearing shaft, where it is in sliding contact with the bearing seal. The wear resistant diamond-like carbon coating reduces wear and corrosion of the head bearing shaft sealing surface and provides extended life to the bearing seal.