Boring or penetrating the earth – With means movable relative to tool to receive – retain – or...
Patent
1991-04-04
1992-04-28
Novosad, Stephen J.
Boring or penetrating the earth
With means movable relative to tool to receive, retain, or...
E21B 1710, E21B 2500
Patent
active
051079429
ABSTRACT:
A stabilizer bearing assembly is described for maintaining separation between a substantially nonrotating inner tube assembly and a rotating core barrel within which the inner tube assembly is disposed. The bearing assembly comprises a cylindrical tube having a cylindrical sleeve segment concentrically slidably mounted on the tube over an external bearing portion thereof. The tube includes an upper and a lower segment, with the hardened bearing portion over which the sleeve sits being located near the lower end of the upper segment. A flange demarcs the upper edge of the bearing portion. The upper end of the lower tube segment is threadedly attached over the lower end of the upper segment. The sleeve segment is trapped between the flange and the edge of the upper end of the lower tube segment. The inner surface of the sleeve has a plurality of spaced longitudinal furrows and the outer surface of the sleeve has raised ridges corresponding to the furrows. The furrows provide a passage for drilling fluid and debris. The ridges have at their tops flattened bearing surfaces which define an outer circumference whose radius is greater than the radius of the outer circumference of the sleeve segment and the tube. The stabilizer assembly can be detachably inserted between adjacent upper and lower elements of an inner tube assembly. For use, one or more of such stabilizer assemblies would be inserted at spaced intervals in an inner tube assembly.
REFERENCES:
patent: 3095049 (1963-06-01), Berger
patent: 3504750 (1970-04-01), Tiraspolsky et al.
patent: 3929388 (1975-12-01), Sutko et al.
patent: 4484785 (1984-11-01), Jackson
patent: 4865138 (1989-09-01), Swietlik
Eastman Christensen Coring Handbook, Publ. 1990; Cover, pp. 4-30/4-31 and 7-26.
Baker Hughes Incorporated
Novosad Stephen J.
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