Method of determining characteristics of a rotary drag-type dril

Details Method of determining characteristics of a rotary drag-type dril Method of determining characteristics of a rotary drag-type dril

1999-02-05

2000-12-26

Schoeppel, Roger

Boring or penetrating the earth

Automatic control

175 27, E21B 4400

Patent

active

061643904

ABSTRACT:
A method of predicting the walk rate of a design of rotary drag-type drill bit of the kind where the leading face of the bit body is formed with a central depression, or cone, comprises the steps of: calculating the cone volume V.sub.cone of the bit; calculating that ratio ##EQU1## of the total torque generated by the cutters on the bit which is attributable to those cutters which are mounted in said cone; calculating a Walk Factor ##EQU2## and then determining the predicted walk rate W of the bit from a graph, or other database, relating previously established values of F for other drill bits to the respective walk rates W for those drill bits.

REFERENCES:
patent: 4629373 (1986-12-01), Hall
patent: 4804051 (1989-02-01), Ho
patent: 4842082 (1989-06-01), Springer
patent: 5099929 (1992-03-01), Keith et al.
patent: 5456141 (1995-10-01), Ho
patent: 5608162 (1997-03-01), Ho
patent: 5787022 (1998-07-01), Tibbitts et al.
patent: 5937958 (1999-08-01), Mensa-Wilmot et al.
patent: 5979570 (1999-11-01), McLoughlin et al.
C.J. Perry, "Directional Drilling With PDC Bits in the Gulf of Thailand" SPE 15616, presented at the 61st Annual Technical Conference and Exhibition of the Society of Petroleum Engineers held in New Orleans, LA Oct. 5-8, 1986. (9 Pages).

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