Knurled drill stem

Details Knurled drill stem Knurled drill stem

1984-08-16

1987-09-08

Levy, Stuart S.

Boring or penetrating the earth

With tool shaft detail

285144, 403369, E21B 1700, E21B 1910, F16B 212

Patent

active

046917918

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.

REFERENCES:
patent: 3058386 (1962-10-01), Morrow
patent: 3152458 (1964-10-01), Simonin
patent: 3912406 (1975-10-01), McGrath
patent: 3994517 (1976-11-01), Carmichael et al.
The Oil Weekly, Nov. 14, 1938, pp. 10, 11.

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