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US 10,113,366 B2Granted
Intergland grease
AssigneeHalliburton Energy Services, Inc.
InventorDavid Patrick Duckworth
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to an intergland grease formed from a base grease and a lubricating intergland grease additive, such as PTFE or a lubricating liquid polymer, such as polybutene. The present disclosure further relates to a roller cone drill bit including such an intergland grease.
Claims18
A roller cone drill bit comprising:
- a bit body having at least one support arm extending therefrom;
- a cone assembly containing bearings or retaining balls and rotatably mounted on a journal extending from each support arm;
- at least two seals disposed in grooves formed in the cone assembly and each preventing debris and well fluids from entering an annular gap formed radially between the cone assembly and the journal;
- a lubricant chamber disposed in each support arm and fluidly coupled to at least one seal;
- a floating bead defining an exterior section and an interior section of a bore and in sealing engagement with the bore such that the exterior section and interior section of the bore are not in fluid communication;
- and
- an intergland grease disposed at least in an annular gap between the seals, wherein the intergland grease comprises a base grease and a lubricating intergland grease additive, but comprises no extreme pressure additive, and wherein the interior section of the bore is included as part of the lubricant chamber.
4 more elements
A roller cone drill bit comprising:
- a bit body having at least one support arm extending therefrom;
- a cone assembly containing bearings or retaining balls and rotatably mounted on a journal extending from each support arm;
- a lubricant reservoir disposed in each support arm;
- a lubricant chamber disposed in each support arm and fluidly coupled to the bearings or retaining balls;
- a first bore disposed in each support arm to communicate an intergland grease between the lubricant reservoir and the lubricant chamber, the intergland grease comprising a base grease and a lubricating intergland grease additive, but no extreme pressure additive;
- at least two seals disposed in grooves formed in the cone assembly and in contact with the intergland grease;
- a pressure release mechanism disposed within the first bore, the pressure release mechanism operable to relieve intergland grease from the lubricant reservoir into the lubricant chamber when lubricant pressure within the lubricant reservoir exceeds pressure of the intergland grease in the lubricant chamber;
- and
- a floating bead defining an exterior section and an interior section of a second bore and in sealing engagement with the second bore such that the exterior section and interior section of the second bore are not in fluid communication,
- wherein the interior section of the second bore is included as part of the lubricant chamber.
7 more elements
Dependencies are inferred from the claim text.