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US 2016/0290053 A1Published application
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.
Claims20
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 located in a passage;
- a lubricant chamber disposed in each support arm and fluidly coupled to at least one seal via a passage;
- a bead disposed in the passage;
- 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.
5 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 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;
- at least two seals disposed in grooves formed in the cone assembly and in contact with the intergland grease;
- and
- a pressure release mechanism disposed within the 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.
5 more elements
Dependencies are inferred from the claim text.