Knurled drill stem
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United States of America Patent
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-
Sep 8, 1987
Grant Date -
N/A
app pub date -
Aug 16, 1984
filing date -
Aug 17, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention disclosed herein concerns a drill stem intended for sinking shafts in the ground, especially for the oil and natural gas industry. It has on its outer periphery a surface of revolution providing a succession of hollow profiles with a rounded shape relative to the axis of the stem, said surfaces for revolution being adapted to rest against the internal faces of complementary shape of self-gripping slips which ensure holding of the drill string.
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