Boring or penetrating the earth – Bit or bit element – Noncutting portion forwardly of cutting portion
Reexamination Certificate
2007-11-13
2007-11-13
Gay, Jennifer H (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Noncutting portion forwardly of cutting portion
C175S391000, C175S335000
Reexamination Certificate
active
11545277
ABSTRACT:
A reaming tool including a body adapted to couple to a drill string at both axial ends thereof, the body including a plurality of reaming blades affixed at azimuthally spaced apart locations around the circumference of the body, wherein selected ones of the plurality of reaming blades including at least one cutter attached at a selected position and orientation. Additionally, a pilot hole conditioning section including a plurality of azimuthally spaced apart pilot blades affixed to the body longitudinally ahead of the reaming blades. Furthermore, at least one of the reaming blades formed as a single structure with an azimuthally corresponding pilot blade.
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SPE 15617; T.M. Warren et al., “Laboratory Drilling Performance of PDC Bits”; Jun. 1988; pp. 125-135; (This is a reprint of the original dated Oct. 5, 1986).
SPE 30474; T.M. Warren et al.; “Simultaneous Drilling and Reaming With Fixed Blade Reamers”; Oct. 1995; pp. 251-261.
Gay Jennifer H
Osha & Liang LLP
Smith International Inc.
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