Method for simulating drilling of roller cone bits and its application to roller cone bit design and performance
DCFirst Claim
1. A method for generating a visual representation of a roller cone bit drilling in earth formations, comprising:
- selecting bit design parameters, comprising at least a geometry of a cutting element on said bit;
selecting drilling parameters, comprising at least an axial force on said bit;
selecting an earth formation to be represented as drilled;
calculating from said selected drilling parameters, said selected bit design parameters and said earth formation, parameters for a crater formed when one of a plurality of said cutting elements contacts said earth formation;
calculating a bottomhole geometry, wherein said crater is removed from a bottomhole surface;
simulating incrementally rotating said bit, and repeating said calculating of said crater parameters and said bottomhole geometry based on calculated roller cone rotation speed and geometrical location with respect to rotation of said roller cone drill bit about its axis; and
converting said crater parameters and said bottomhole geometry parameters into said visual representation.
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Abstract
A method for simulating the drilling performance of a roller cone bit drilling an earth formation may be used to generate a visual representation of drilling, to design roller cone drill bits, and to optimize the drilling performance of a roller cone bit. The method for generating a visual representation of a roller cone bit drilling earth formations includes selecting bit design parameters, selecting drilling parameters, and selecting an earth formation to be drilled. The method further includes calculating, from the bit design parameters, drilling parameters and earth formation, parameters of a crater formed when one of a plurality of cutting elements contacts the earth formation. The method further includes calculating a bottomhole geometry, wherein the crater is removed from a bottomhole surface. The method also includes incrementally rotating the bit and repeating the calculating of crater parameters and bottomhole geometry based on calculated roller cone rotation speed and geometrical location with respect to rotation of said roller cone drill bit about its axis. The method also includes converting the crater and bottomhole geometry parameters into a visual representation.
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Citations
64 Claims
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1. A method for generating a visual representation of a roller cone bit drilling in earth formations, comprising:
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selecting bit design parameters, comprising at least a geometry of a cutting element on said bit;
selecting drilling parameters, comprising at least an axial force on said bit;
selecting an earth formation to be represented as drilled;
calculating from said selected drilling parameters, said selected bit design parameters and said earth formation, parameters for a crater formed when one of a plurality of said cutting elements contacts said earth formation;
calculating a bottomhole geometry, wherein said crater is removed from a bottomhole surface;
simulating incrementally rotating said bit, and repeating said calculating of said crater parameters and said bottomhole geometry based on calculated roller cone rotation speed and geometrical location with respect to rotation of said roller cone drill bit about its axis; and
converting said crater parameters and said bottomhole geometry parameters into said visual representation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for designing a roller cone drill bit, comprising:
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selecting initial bit design parameters, comprising at least a geometry of a cutting element on said bit;
selecting drilling parameters, comprising at least an axial force on said bit;
selecting an earth formation to be represented as drilled;
calculating from said selected drilling parameters, said selected bit design parameters and said earth formation, parameters for a crater formed when one of a plurality of said cutting elements contacts said earth formation;
calculating a bottomhole geometry, wherein said crater is removed from a bottomhole surface;
simulating incrementally rotating said bit, and repeating said calculating of said crater parameters and said bottomhole geometry based on calculated roller cone rotation speed and geometrical location with respect to rotation of said roller cone drill bit about its axis; and
adjusting at least one of said initial bit design parameters, and repeating said calculating said crater parameters, said bottom hole geometry and said simulated incrementally rotating until an optimal set of said bit design parameters is obtained. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method for optimizing drilling parameters of a roller cone drill bit drilling an earth formation, comprising:
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selecting bit design parameters, comprising at least a geometry of a cutting element on said bit;
selecting initial drilling parameters, comprising at least an axial force on said bit;
selecting an earth formation to be represented as drilled;
calculating from said selected drilling parameters, said selected bit design parameters and said earth formation, parameters for a crater formed when one of a plurality of said cutting elements contacts said earth formation;
calculating a bottomhole geometry, wherein said crater is removed from a bottomhole surface;
simulating incrementally rotating said bit, and repeating said calculating of said crater parameters and said bottomhole geometry based on calculated roller cone rotation speed and geometrical location with respect to rotation of said roller cone drill bit about its axis; and
adjusting at least one of said initial drilling parameters, and repeating said calculating said crater parameters, said bottom hole geometry and said simulating incrementally rotating until an optimal set of said drilling parameters is obtained. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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Specification