Flexible drill string member especially for use in directional drilling
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United States of America Patent
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-
Mar 14, 1989
Grant Date -
N/A
app pub date -
Oct 22, 1987
filing date -
Oct 22, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an improved drill string member having at least one spiral groove formed in its outside surface and incorporating a combination of engineering considerations and criteria such that the invention member will have an extraordinarily high performance capacity in directional drilling. The invention member can make bends in the well on radii as short as 25-50 feet and is particularly suitable for operation together with downhole motor driven bits.
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