Three-dimensional tooth orientation for roller cone bits
First Claim
1. A method for designing a roller-cone earth-penetrating drill bit, comprising the actions of:
- simulating the unconstrained motion of cones of a roller-cone earth-penetrating drill bit, including the trajectories of teeth thereof through rock being drilled;
and, for multiple respective ones of said teeth, both adjusting a respective crest orientation thereof, in accordance with the general direction of the trajectory of said tooth in a plane normal to the wellbore axis, and also adjusting an axis of said tooth in accordance with the angle at which said tooth indents said rock at the start of said trajectory of said tooth.
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Accused Products
Abstract
The present application describes bit design methods (and corresponding bits, drilling methods, and systems) in which the three-dimensional trajectory of an individual tooth cutting into the formation can be obtained and visualized from computer drilling simulator. In order to improve the drilling efficiency of each tooth, it is necessary to orient the tooth three-dimensionally in such a way that its longer crest is perpendicular to the scraping direction, and the top part of the tooth is angled to follow the indentation direction. Such a three-dimensional orientation allows the stress across the surface of the tooth to be more uniformly distributed, thereby, reducing breakage of the tooth.
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Citations
104 Claims
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1. A method for designing a roller-cone earth-penetrating drill bit, comprising the actions of:
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simulating the unconstrained motion of cones of a roller-cone earth-penetrating drill bit, including the trajectories of teeth thereof through rock being drilled;
and, for multiple respective ones of said teeth, both adjusting a respective crest orientation thereof, in accordance with the general direction of the trajectory of said tooth in a plane normal to the wellbore axis, and also adjusting an axis of said tooth in accordance with the angle at which said tooth indents said rock at the start of said trajectory of said tooth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 98)
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17. A method for designing a roller-cone earth-penetrating drill bit, comprising the actions of:
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fully simulating the motion of a roller-cone earth-penetrating drill bit, including the unconstrained rotation of cones thereof, and the trajectories of teeth supported by said cones through rock being drilled;
and, for multiple respective ones of said teeth, both adjusting a respective crest orientation thereof, and also adjusting an axis of said tooth in accordance with the angle at which said tooth indents said rock at the start of said trajectory of said tooth. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 99)
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29. A method for designing a roller-cone earth-penetrating drill bit, comprising the actions of:
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simulating the trajectories of teeth supported by cones of said drill bit through rock under drilling conditions;
and, for multiple respective ones of said teeth, adjusting at least two different orientation angles thereof, said orientation angles being different from parameters which define the characteristics of the respective tooth, and different from parameters which define the location of the respective tooth on the surface of the cone. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 100)
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41. A method for designing a roller-cone earth-penetrating drill bit, comprising the actions of:
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simulating the unconstrained motion of cones of a roller-cone earth-penetrating drill bit, including the three-dimensional trajectories of teeth thereof through rock being drilled;
and, for at least one of said teeth, adjusting an axis of said tooth in accordance with the direction at which said tooth indents said rock at the start of said trajectory. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 101)
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53. A method for designing a roller-cone earth-penetrating drill bit, comprising the actions of:
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simulating the unconstrained motion of cones of a roller-cone earth-penetrating drill bit, including the three-dimensional trajectories of teeth thereof through rock being drilled;
and, for at least one of said teeth, adjusting the orientation of the crest of said tooth; and
adjusting the orientation of the top part of said tooth, in dependence on said trajectory. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 102)
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66. A method for designing a roller-cone earth-penetrating drill bit, comprising the actions of:
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simulating the unconstrained motion of cones of a roller-cone earth-penetrating drill bit, including the three-dimensional trajectories of teeth thereof through rock being drilled;
and, for at least one of said teeth, determining the indentation angle for said teeth, in dependence on said trajectory; and
orientating the top part of said tooth with respect to the indentation angle. - View Dependent Claims (67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 103)
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77. A method for designing a roller-cone earth-penetrating drill bit, comprising the actions of:
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simulating the unconstrained motion of cones of a roller-cone earth-penetrating drill bit, including the three-dimensional trajectories of teeth thereof through rock being drilled;
and, for at least one of said teeth, adjusting said teeth, in dependence on said trajectory;
such that the normal of the surface of said teeth is in line with the penetration direction of said teeth through rock being drilled. - View Dependent Claims (78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 104)
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88. A roller-cone earth-penetrating drill bit comprising:
one or more teeth, wherein the crest length is perpendicular to the scraping direction of said teeth through rock being drilled, and the top part follows the indentation direction of said teeth through rock being drilled. - View Dependent Claims (89)
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90. A roller-cone earth-penetrating drill bit comprising:
one or more teeth, wherein the normal of the surface of said teeth when said respective teeth first contacts cutting face is in line with the penetration direction of said teeth through rock being drilled. - View Dependent Claims (91)
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92. A roller-cone earth-penetrating drill bit comprising:
one or more teeth with an axis adjusted in accordance with the trajectory of said respective teeth onto a cutting surface. - View Dependent Claims (93)
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94. A roller-cone earth-penetrating drill bit comprising:
one or more teeth with an axis adjusted in accordance with an angle at which said respective teeth penetrates through a cutting surface into a volume of material therebeneath. - View Dependent Claims (95)
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96. A roller-cone earth-penetrating drill bit comprising:
one or more teeth with the crests and the top parts of said respective teeth adjusted in dependence on a three-dimensional trajectory of said respective teeth through formation being drilled. - View Dependent Claims (97)
Specification