Boring or penetrating the earth – Processes
Patent
1995-06-05
1996-12-03
Dang, Hoang C.
Boring or penetrating the earth
Processes
1662417, 1753253, 1753256, E21B 1710
Patent
active
055798543
ABSTRACT:
A drill pipe casing protector has an inner hub member releasably secured to the exterior of a drill pipe to rotate therewith and an outer buffer ring rotatably mounted on the inner hub to allow relative rotation between the drill pipe and the outer buffer ring when the outer buffer ring engages the interior of the casing in which the drill pipe is rotating to prevent abrasive wear between the drill string and the interior of the casing. The inner hub is formed of semi-cylindrical elastomer segments which are clamped around the drill pipe, each having a metallic semi-cylindrical cage element embedded therein and a semi-cylindrical low friction bearing surface on the exterior thereof. A tapered wedge pin draws the elastomer segments radially inward to firmly grip the drill pipe and secure the inner hub member thereto. The outer buffer ring is also formed of semi-cylindrical elastomer segments each having a metallic semi-cylindrical cage element embedded therein which encircle the inner hub bearing surface in radially spaced relation to allow relative rotation therebetween. The outer buffer ring prevents contact between the exterior of the drill pipe and the interior of the casing, and the drill string and inner hub rotate together relative to the outer buffer ring when it is frictionally engaged with the interior of the casing. Drilling fluid provides lubrication between the inner hub member and outer buffer ring.
REFERENCES:
patent: 1651088 (1927-11-01), Fentress
patent: 2127796 (1938-08-01), Willis
patent: 2860013 (1958-11-01), Medearis
patent: 3197262 (1965-07-01), Fairchild
patent: 3894780 (1975-07-01), Broussard
patent: 5069297 (1991-12-01), Krueger et al.
patent: 5191938 (1993-03-01), Sable et al.
patent: 5261498 (1993-11-01), Steinkamp et al.
Dang Hoang C.
Guzman Fernando J.
Roddy Kenneth A.
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