Boring or penetrating the earth – Bit or bit element – Casing shoe type
Patent
1986-10-14
1987-12-29
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Casing shoe type
E21B 1002
Patent
active
047154551
ABSTRACT:
A drill shoe adapted to fit onto a drill pipe of external diameter d.sub.e and internal diameter d.sub.i comprises an externally stepped cutting surface comprising a plurality of steps, the diameters of the steps increasing as they progress away from the tip of the shoe. The maximum external diameter D.sub.e of the shoe is greater than the external diameter d.sub.e of the drill pipe. The shoe also comprises an internal, substantially cylindrical, inner surface of diameter D.sub.i, D.sub.i being less than the internal diameter d.sub.i of the drill pipe.
The shoe is suitable for use in a vibratory drill string for obtaining cores from unconsolidated geological formations, such as soil, sand and gravel or similar materials.
REFERENCES:
patent: 1058567 (1913-04-01), Edgar et al.
patent: 1062647 (1913-05-01), Guiberson et al.
patent: 1078530 (1913-11-01), Baker
patent: 2646822 (1953-07-01), Ferguson
patent: 3833075 (1974-09-01), Bachman et al.
patent: 4146060 (1979-03-01), Garrett
patent: 4603748 (1986-08-01), Rossfelder et al.
Bollands Martin A.
Pike William C.
Thukral Prem S.
Woolmington Timothy P.
Novosad Stephen J.
The British Petroleum Company p.l.c.
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