Drilling tool of the displacing type

Details Drilling tool of the displacing type Drilling tool of the displacing type

1993-06-28

1994-10-11

Buiz, Michael Powell

Boring or penetrating the earth

Boring without earth removal

175 21, E21B 700

Patent

active

053538838

ABSTRACT:
A drilling tool (10) of the displacing type comprises a displacing head (22) including a cylindrical mid head portion (24) and lower and upper frustoconical head portions (26, 28). A lower drill portion (12) carries a helical rib (16) which also extends over the lower head portion (26), all portions of this rib being of equal height. The upper head portion (28) is formed with spiroconical displacing walls (32).

REFERENCES:
patent: 4458765 (1984-07-01), Feklin et al.
patent: 5031707 (1991-07-01), Gerasimenko et al.

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