Patent ID: 8789623

Claim:
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.