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

1998-09-24

2000-11-28

Noori, Max

Measuring and testing

Borehole or drilling

Pressure measurement

7315259, 175427, E21B 4700

Patent

active

06151960&

ABSTRACT:
A method of determining wear characteristics of a rotary drag-type drill bit comprises the steps of: determining the location and shape of a datum profile for the cutters on the bit body: determining the location and shape of a reference profile located inwardly of the datum profile; and ascertaining the volume of superhard material in the cutters between the datum profile and the reference profile. The volume of superhard material in the cutters at discrete radial locations is then plotted against the radial distance of the material from the axis of rotation of the bit body. The predicted wear rate WR.sub.r of superhard material at radius r is also calculated as a function of the volume and the predicted wear rate is plotted against r. The type and location of the cutters may then be modified, if necessary, to give a wear rate which is substantially constant across the radius of the drill bit.

REFERENCES:
patent: 4475606 (1984-10-01), Crow
patent: 4694686 (1987-09-01), Fildes et al.
patent: 4928521 (1990-05-01), Jardine
patent: 5131478 (1992-07-01), Brett et al.
patent: 5216917 (1993-06-01), Detournay
J.D. Barr Optimisation of Radial Distribution of Stratapax (T1) Cutters in Rock Drilling Bits Paper presented at Energy-sources Technology Conference, New Orleans, Feb. 1980, ASME Petroleum Division.
DBS Literature entitled "TD 13/TD 19 Drill Bit Series", undated but believed to date from about 1991 (7 Pages).

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