Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Silicon dioxide – silicic acid – orthosilicate – or...
Patent
1996-04-08
1997-09-16
Medley, Margaret
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Silicon dioxide, silicic acid, orthosilicate, or...
508591, 175224, 175228, 175371, C10M10702, C10M10708, C10M14100, E21B 1016
Patent
active
056680929
ABSTRACT:
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. The rock bit grease composition has a viscosity index in the range of from about 250 to 325, and has an absolute viscosity of greater than about 100,000 centipoise at a temperature of approximately 70.degree. F. and at a shear rate of less than about 40 seconds.sup.-1, without the use of solid metal-containing extreme pressure agents or thickening agents. The grease composition forms a lubricant film having enhanced thicknesses, when compared to conventional mineral oil-based greases, to provide excellent rock bit bearing lubrication.
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Brochure: "Amoco Polybutene" (Amoco Chem. Co., 1990); month unknown pp. 1-3, 14-19, 23-35
Product Desc.: Vistanex LM (Exxon Chem. n.d. 1 pg.); date unknown.
Anglamol 6063A (Lubrizol Corp., Nov. 1990, 8 pg.); Lubrizol 6662 (Lubrizol Corp. Nov. 1990, 5 pg.); Parapol (Exxon Chem., Sep. 1992, 2 pg.).
Emery 3004 PAO 4 cST (Henkel Corp. Sep. 190, 2 pg.); Vanlube 829 (R.T. Vanderbilt Co., n.d. Doc. No. VL-829-1, 1pg.).
Parapol 2500 (Exxon Chem. n.d. Doc. No. 03-813720/9111, 2 pg.).
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C.V. Smalhear & R. Karidy Smith, Lubricant Additives 1967 month unknown.
Medley Margaret
Smith International Inc.
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