Roller cone core bit

Details Roller cone core bit Roller cone core bit

1993-06-24

1995-10-03

Melius, Terry Lee

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175376, 175403, E21B 1016

Patent

active

054544378

ABSTRACT:
The present invention relates to an improved roller cone core bit comprising a plurality of cone cutters facing inboard and a single cone cutter facing outboard. The single outboard facing cone cutter provides additional cutting elements for cutting a core. The single outboard facing cone cutter also creates an unbalanced loading condition on the core bit causing the bit to drill smoother than conventional reversed cone core bits.

REFERENCES:
patent: 1978085 (1934-10-01), Howard et al.
patent: 2030298 (1936-02-01), Howard et al.
patent: 4763736 (1988-08-01), Varel, Sr.
Globe Oil Tools Catalog No. 41.
Security six-cone hole opener (date unknown).
Prior art core bit having two inboard facing and two outboard facing cones. (date unknown).
Prior art core bit having four inboard facing cone cutters. (date unknown).

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