High speed rock bit

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means

Patent

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Details

175372, 175374, E21B 1022

Patent

active

051523531

ABSTRACT:
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 perfluoroalkyls and monomers including a perfluoroalkyl ether group.

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G. H. Kalb, et al., Terpolymers of Tetrafluoroethylene Perfluoro (Methyl Vinyl Ether), and Certain Cure Site Monomers, Apr. 13, 1972, pp. 13-26, Research Laboratory, Elastomer Chemicals Department, E. I. Du Pont de Nemours and Co., Inc.
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What Does It Cost to "Pull" A Well Because of Seal Failure? -It's Hard to Put a Price on Dependability, But it's easy to put a name on it-Kalrez Perfluoroelastomer Parts, 6 pages, DuPont Kalrez Bartley Mill Plaza #18.
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