Stabilizer sleeve for drill string
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United States of America Patent
Stats
-
Apr 25, 1989
Grant Date -
N/A
app pub date -
Aug 27, 1987
filing date -
Aug 27, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drill string stabilizer includes a cylindrical sleeve 11 coaxially surrounding a central tubular element 10 and fixed thereto by a plurality of helical blades 17 extending between the facing surfaces of the sleeve and the element. Converging truncated cones 13, 16 are provided on both ends of the sleeve. The upwardly flowing drilling mud establishes an annular fluid bearing between the sleeve and the borehole, while the helical blades implement a pumping function to enhance the discharge of the mud and cuttings.
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