PDC drill bit with cutter design optimized with dynamic centerline analysis having an angular separation in imbalance forces of 180 degrees for maximum time
First Claim
1. A computer implemented method for designing a fixed cutter drill bit, comprising:
- dynamically modeling the fixed cutter drill bit during simulated drilling in an earth formation for a period of time;
determining radial and circumferential components of imbalance forces on the drill bit and a Beta angle between the radial and circumferential components of the imbalance force during the period of dynamically simulated drilling;
adjusting a value of at least one design parameter for the fixed cutter drill bit based upon at least the Beta angle, wherein the adjusting the value of at least one design parameter comprises adjusting the at least one parameter to increase the proportion of time the Beta angle is at or near 180 degrees by about 3% or more of the simulated drilling time; and
repeating the simulating, determining, and adjusting to change a simulated performance of the fixed cutter drill bit.
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Abstract
A method for designing a fixed cutter drill bit, includes simulating the fixed cutter drill bit drilling in an earth formation, determining radial and circumferential components of imbalance forces on the drill bit and a Beta angle between the radial and circumferential components of the imbalance forces during a period of simulated drilling, and adjusting a value of at least one design parameter for the fixed cutter drill bit at least based upon the Beta angle. To facilitate drill bit design, the Beta angel can be displayed to a drill bit designer. To improve performance, the method can include repeating the simulating, determining, and adjusting to change a simulated performance of the fixed cutter drill bit. A drill bit may be made according to the design resulting from the method.
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Citations
22 Claims
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1. A computer implemented method for designing a fixed cutter drill bit, comprising:
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dynamically modeling the fixed cutter drill bit during simulated drilling in an earth formation for a period of time; determining radial and circumferential components of imbalance forces on the drill bit and a Beta angle between the radial and circumferential components of the imbalance force during the period of dynamically simulated drilling; adjusting a value of at least one design parameter for the fixed cutter drill bit based upon at least the Beta angle, wherein the adjusting the value of at least one design parameter comprises adjusting the at least one parameter to increase the proportion of time the Beta angle is at or near 180 degrees by about 3% or more of the simulated drilling time; and repeating the simulating, determining, and adjusting to change a simulated performance of the fixed cutter drill bit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer implemented method for designing a fixed cutter drill bit, comprising:
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dynamically modeling the fixed cutter drill bit during simulated drilling in an earth formation for a period of time; determining a Beta angle between the total of imbalanced radial forces and the total of imbalanced circumferential forces of the fixed cutter drill bit while dynamically simulating drilling in an earth formation; graphically displaying the Beta angle to a design engineer, for the design engineer to adjust at least one design parameter for the fixed cutter drill bit; and repeating the steps of determining, and displaying for the design engineer to adjust at least one design parameter until a period of simulated drilling time at which the Beta angle is at or near 180 degrees is increased by about 3% or more of the simulated drilling time. - View Dependent Claims (20, 21, 22)
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Specification