Drill string fitting
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United States of America Patent
Stats
-
Apr 3, 2001
Grant Date -
N/A
app pub date -
Feb 12, 1998
filing date -
Apr 27, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fitting for reducing friction between a drilling string and the wall of a well. In a first aspect the fitting has recesses (6) provided along the bore of the fitting to lubricate the interface between the fitting and the drill string to minimise friction. In a second aspect a fitting is provided on a drill string having rotatable roller means (21) which can rotate about a point of rotation (23) so as to minimise both axial and rotational friction. According to a third aspect the fitting comprises an inner section (30) secured to a drill pipe (35) or other fitting and an outer section (31) rotatable about the inner section (30). Preferably a sealed bearing (36, 42-47, 37, 38) is provided between the inner section (30) and outer section (31).
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