Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Reexamination Certificate
2006-08-29
2006-08-29
Tsay, Frank S. (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
C175S413000, C166S316000
Reexamination Certificate
active
07096982
ABSTRACT:
A method and apparatus for a drilling with casing includes therewith a drill shoe configured for later drilling through thereof in situ, with cutters retainable thereon in response to the forces encountered during borehole drilling, yet moveable from the envelope through which the later drill shoe will pass when cutting through the in situ drill shoe. The drill shoe includes one or more profiles thereon, into which blades carrying the formation drilling cutters are disposed. The profiles include at least one projection thereon, which is received within a mating slot in the blades. The blades also may be configured to have opposed sections which are configured with respect to one another to have an included angle of less than ninety degrees.
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Haugen David M.
McKay David
Tsay Frank S.
Weatherford / Lamb, Inc.
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