System and method for controlling drill bit usage and well plan

Details System and method for controlling drill bit usage and well plan System and method for controlling drill bit usage and well plan

1992-04-08

1994-04-26

Neuder, William P.

Boring or penetrating the earth

With bit wear signal generating

73151, 175 26, E21B 4400

Patent

active

053058364

ABSTRACT:
Hardware, software and methods for controlling the usage of well drill bits and other aspects of well drilling plans. At least a portion of a given well is drilled with a given drill bit. An abrasive-wear-affecting variable (drilling strength) for the lithology which has been most recently drilled with the bit is continually evaluated. The current abrasive wear of the bit by the total lithology which has been drilled thereby is continually calculated, based on the abrasive-wear-affecting variable. Continued use or retirement of the bit is controlled in accord with the wear calculation. Relative pore pressure at the current site of the drill bit is a useful by product which can be independently used to control other aspects of the well drilling plan, e.g. mud weight and the setting of casing.

REFERENCES:
patent: 5216917 (1993-06-01), Detournay

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