Methods for designing fixed cutter bits and bits made using such methods
First Claim
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1. A method for designing a fixed cutter drill bit, said method comprising:
- (a) selecting a cutter;
(b) selecting an earth formation;
(c) engaging said cutter with said earth formation at a selected orientation with respect to said earth formation;
(d) determining a force on the cutter;
(e) creating a database of the determined force and data representative of at least one of a force applied to the cutter, selected depth of cut, the selected orientation of the cutter, and a geometric parameter of the cutter;
(f) simulating a fixed cutter drill bit drilling a formation;
(g) determining a force on at least one cutter of the simulated fixed cutter drill bit, wherein the determining comprises;
accessing the data stored in the database;
(h) designing a fixed cutter drill bit based on the simulating and the determining the force on at least one cutter of the simulated fixed cutter drill bit; and
(i) graphically displaying the designed fixed cutter drill bit.
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Abstract
In one aspect, the invention provides a method for modeling the dynamic performance of a fixed cutter bit drilling earth formations. In one embodiment, the method includes selecting a drill bit and an earth formation to be represented as drilled, simulating the bit drilling the earth formation. The simulation includes at least numerically rotating the bit, calculating bit interaction with the earth formation during the rotating, and determining the forces on the cutters during the rotation based on the calculated interaction with earth formation and empirical data.
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Citations
20 Claims
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1. A method for designing a fixed cutter drill bit, said method comprising:
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(a) selecting a cutter; (b) selecting an earth formation; (c) engaging said cutter with said earth formation at a selected orientation with respect to said earth formation; (d) determining a force on the cutter; (e) creating a database of the determined force and data representative of at least one of a force applied to the cutter, selected depth of cut, the selected orientation of the cutter, and a geometric parameter of the cutter; (f) simulating a fixed cutter drill bit drilling a formation; (g) determining a force on at least one cutter of the simulated fixed cutter drill bit, wherein the determining comprises; accessing the data stored in the database; (h) designing a fixed cutter drill bit based on the simulating and the determining the force on at least one cutter of the simulated fixed cutter drill bit; and (i) graphically displaying the designed fixed cutter drill bit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for designing a fixed cutter drill bit, said method comprising:
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(a) selecting a blade having a plurality of cutters disposed thereon, the cutters having selected orientations and geometries; (b) selecting an earth formation; (c) engaging said blade with said earth formation such that a certain number of said cutters engage the formation at a selected orientation with respect to said earth formation; (d) applying a force to said blade to make said blade cut through the formation at a depth of cut; (e) creating a database of the force, and data representative of at least one of the depth of cut, the selected orientation of the cutters, and the selected geometry of the cutters; (f) simulating a fixed cutter drill bit drilling a formation; (g) determining a force on at least one blade of the simulated fixed cutter drill bit, wherein the determining comprises; accessing the data stored in the database; (h) designing a fixed cutter drill bit based on the simulating and the determining the force on at least one blade of the simulated fixed cutter drill bit; and (i) graphically displaying the designed fixed cutter drill bit.
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Specification