Rock bit grease composition

Details Rock bit grease composition Rock bit grease composition

E - Fixed Constructions

21

B

E21B 10/60 (2006.01) C10M 107/04 (2006.01) C10M 107/08 (2006.01) C10M 169/00 (2006.01) E21B 10/24 (2006.01) F16N 9/02 (2006.01)

Patent

CA 2119410

A rock bit for drilling subterranean formations is lubricated with a grease composition made from a high-viscosity synthetic lubricant basestock and a combination of lubricant additives. The grease composition preferably has in the range of from 1 to 20 percent by weight polyisobutylene, in the range of from 50 to 90 percent by weight ethylene-alphaolefin, up to approximately 40 percent by weight polyalphaolefin and in the range of from 4 to 45 percent by weight lubricant additives. For best lubrication in the severe environment of a rock bit bearing, the absolute viscosity of the composition is greater than about 100,000 centipoise at a temperature of approximately 70°F, and at a shear rate less than about 40 seconds-1.

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