Drill bit and design method for optimizing distribution of individual cutter forces, torque, work, or power
First Claim
1. A method for designing a fixed cutter drill bit, comprising:
- defining a cutting structure for the fixed cutter bit and applying the defined cutting structure to a simulated formation for producing generated values of at least one cutter parameter for the defined cutting structure selected from the group consisting of force, torque, work, and power;
determining whether the generated values of the at least one cutter parameter meet one or more design criteria for optimizing a distribution of generated values for individual cutters relative to other cutters within a region or among regions of the fixed cutter bit; and
redefining the cutting structure until the one or more distribution design criteria are met;
wherein the method is implemented utilizing one or more computer programs.
1 Assignment
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Accused Products
Abstract
A design process and resulting bit structure is provided for drill bits wherein cutter geometries on the face of the bit are tailored to optimize the distribution of one or more of forces, torque, work, or power of each cutter relative to other cutters. Balanced are the forces, torque, work, or power generated by each cutter in respect to other cutters that are working within the same region of cut, so that all cutters within the same region of cut are generating sufficiently comparable forces, torque, work, or power. In this manner all of the cutters on the bit may share as closely as possible the work and loads required to penetrate the subterranean rock. The design process produces a bit structure in which each cutter is doing similar levels of work or creating similar levels of force, torque, or power relative to other cutters within the same region of cut on the bit, within specified ranges of design criteria.
26 Citations
19 Claims
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1. A method for designing a fixed cutter drill bit, comprising:
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defining a cutting structure for the fixed cutter bit and applying the defined cutting structure to a simulated formation for producing generated values of at least one cutter parameter for the defined cutting structure selected from the group consisting of force, torque, work, and power; determining whether the generated values of the at least one cutter parameter meet one or more design criteria for optimizing a distribution of generated values for individual cutters relative to other cutters within a region or among regions of the fixed cutter bit; and redefining the cutting structure until the one or more distribution design criteria are met; wherein the method is implemented utilizing one or more computer programs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for designing a fixed cutter drill bit, comprising:
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defining a cutting structure for the fixed cutter bit and applying the defined cutting structure to a simulated formation for producing generated values of at least one cutter parameter for the defined cutting structure selected from the group consisting of force, torque, work, or power; determining whether a summation of generated force values of the defined cutting structure produce a net imbalance force for the fixed cutter bit that meets one or more design criteria, and redefining the cutting structure until the one or more net imbalance force design criteria are met; and determining whether the generated values of the at least one cutter parameter meet one or more design criteria for optimizing a distribution of generated values for individual cutters relative to other cutters within a region of the fixed cutter bit, and redefining the cutting structure until the one or more distribution design criteria are met; wherein the method is implemented utilizing one or more computer programs. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A fixed cutter drill bit designed by:
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defining a cutting structure for the fixed cutter bit and applying the defined cutting structure to a simulated formation for producing generated values of at least one cutter parameter for the defined cutting structure selected from the group consisting of force, torque, work, or power; determining whether the generated values of the at least one cutter parameter meet one or more design criteria for optimizing a distribution of generated values for individual cutters relative to other cutters within a region of the fixed cutter bit; and redefining the cutting structure until the one or more distribution design criteria are met.
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19. A drilling system, comprising:
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a drill string which is connected to a fixed cutter bit; and a rotary drive configured to rotate at least part of the drill string together with the fixed cutter bit; and wherein the fixed cutter bit is designed by; defining a cutting structure for the fixed cutter bit and applying the defined cutting structure to a simulated formation for producing generated values of at least one cutter parameter for the defined cutting structure selected from the group consisting of force, torque, work, or power; determining whether the generated values of the at least one cutter parameter meet one or more design criteria for optimizing a distribution of generated values for individual cutters relative to other cutters within a region of the fixed cutter bit; and redefining the cutting structure until the one or more distribution design criteria are met.
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Specification