Methods, systems, and bottom hole assemblies including...

Details Methods, systems, and bottom hole assemblies including... Methods, systems, and bottom hole assemblies including...

2009-04-23

2011-12-13

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Processes

C175S385000, C175S391000, C175S406000, C175S431000

Reexamination Certificate

active

08074741

ABSTRACT:
Reamer bits have cutters with different effective back rake angles. Drilling systems include a pilot bit and a reamer bit, wherein cutters in shoulder regions of the reamer bit have a greater average effective back rake angle than cutters in shoulder regions of the pilot bit. Methods of drilling wellbores include drilling a bore with a pilot bit, and reaming the bore with a reamer bit having cutters in shoulder regions of the reamer bit that have an average effective back rake angle greater than that of cutters in shoulder regions of the pilot bit. Methods of forming drilling systems include attaching pilot and reamer bits to a drill string, and positioning cutters in shoulder regions of the reamer bit to have an average effective back rake angle greater than that of cutters in shoulder regions of the pilot bit.

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