Methods and apparatuses for estimating drill bit condition

Details Methods and apparatuses for estimating drill bit condition Methods and apparatuses for estimating drill bit condition

2009-02-24

2011-10-04

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Processes

C175S040000, C073S152480, C073S152460

Reexamination Certificate

active

08028764

ABSTRACT:
A drill bit for drilling subterranean formations includes a bit body bearing at least one gage pad and a shank extending from the bit body. An annular chamber is formed within the shank. A data evaluation module is disposed in the annular chamber and includes a processor, a memory, and a communication port. The data evaluation module estimates a gage pad wear by periodically sampling a tangential accelerometer and a radial accelerometer disposed in the drill bit. A history of the tangential acceleration and the radial acceleration is analyzed to determine a revolution rate, gage-slipping periods, and gage-cutting periods. A change in a gage-pad-wear state is estimated responsive to an analysis of the revolution rate, the at least one gage-cutting period and the at least one gage-slipping period. The determination of the gage-pad-wear state may also include analyzing a formation hardness.

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