High Performance Rock Bit Grease
AssigneeHalliburton Energy Services, Inc.
InventorsDavid P. Duckworth, Ping C. Sui, Liwen Wei
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to greases containing metal sulfonate thickeners. In one example the thickener may be a calcium sulfonate thickener. In other examples grease may contain a combination of a metal sulfonate thickener and another thickener, such as a metal complex soap grease, detergent, or non-soap thickener. The grease may be formulated to meet specific performance criteria relevant to lubrication of a roller cone drill bit in downhole conditions. The disclosure also relates to a roller cone drill bit containing a grease of the disclosure.
Claims20
1-18. (canceled)
A roller cone drill bit operable to form a wellbore extending through a downhole formation comprising:
- a bit body having at least one support arm extending therefrom;
- a respective cone assembly rotatably mounted on a spindle extending from each support arm;
- a grease container disposed in each support arm;
- at least one grease passageway disposed in each support arm to communicate a grease disposed within the grease chamber to bearing surfaces associated with rotatably supporting the respective cone assembly;
- and
- a rock bit grease sealed within the bit body comprising:
- a thickener comprising a metal sulfonate thickener;
- a base oil selected from the group consisting of a mineral oil, a synthetic oil, and combinations thereof;
- at least one solid additive selected from the group consisting of graphite, polytetrafluoroethylene, silica, inorganic sulfur-containing solids, inorganic phosphorus-containing solids, inorganic boron-containing solids, and any combinations thereof;
- and
- at least one oil-soluble additive selected from the group consisting of extreme pressure (EP) additives, oxidation inhibitors, wear and friction reducing additives, polymer additives for enhanced grease integrity, pour point depressant, or corrosion inhibitor, and any combinations thereof.
Dependencies are inferred from the claim text.