High speed rock bit

Details High speed rock bit High speed rock bit

E - Fixed Constructions

21

B

E21B 10/22 (2006.01)

Patent

CA 2056011

HIGH SPEED ROCK BIT Abstract of the Disclosure A rock bit for drilling subterranean formations has improved dynamic O-ring seals for retaining lubricant around the rock bit bearings during operation at more than 50 meters per minute surface speed on the O-rings. Such a bit has a plurality of journal pins, each having a bearing surface, and a cutter cone mounted on each journal pin and including a bearing surface. A pressure- compensated grease reservoir is in communication with such bearing surfaces for maintaining a grease adjacent to the bearing surfaces. The grease is sealed in with dynamic O-ring seals comprising a perfluorinated terpolymer of tetrafluoroethylene, perfluoro(methyl vinyl ether) and a cure site monomer for introducing crosslinking sites. Preferably the cure site monomer is selected from the group consisting of trifluoroethylene, vinyl perfluoro- alkyls and monomers including a perfluoroalkyl ether group.

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