Drag-bit drilling with multi-axial tooth inserts
First Claim
Patent Images
1. A drag-type drill bit, comprising:
- a drill bit body, including at least one tooth pocket and a groove, one end of said groove extending to said tooth pocket; and
at least one angled tooth having a shank seated in said pocket and a front portion which is not parallel to said shank and which is bonded to said groove along a length of said front portion which is more than one-half the minimum diameter of said front portion.
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Abstract
Angled insertable drag bit teeth having a front portion at an oblique angle to a shank portion: the front portion is nearly parallel to the direction of thrust during cutting, and is bonded, along a substantial part of its length, to a groove in the bit body. The shank portion extends down into a pocket in the bit body. Preferably the front portion is faced with a superhard material such as polycrystalline-diamond-compact.
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Citations
10 Claims
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1. A drag-type drill bit, comprising:
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a drill bit body, including at least one tooth pocket and a groove, one end of said groove extending to said tooth pocket; and
at least one angled tooth having a shank seated in said pocket and a front portion which is not parallel to said shank and which is bonded to said groove along a length of said front portion which is more than one-half the minimum diameter of said front portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A drag-type drill bit, for rotary drilling within a normal range of weight-on-bit and rotary torque values, comprising:
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a drill bit body, including at least one tooth pocket, and including a mechanical connection for attachment to a drill string; and
a tooth having a shank seated in said pocket and a front portion with a superhard facing thereon;
said tooth receiving a respective normal range of average tooth force vectors when the normal range of weight-on-bit and rotary torque values are applied to said mechanical connection;
said shank having a primary axis which is oriented at more than about 15 degrees and less than about 45 degrees from said tooth thrust direction, and said front portion having a primary axis which is less than about 15 degrees from said tooth thrust direction, and which is oriented at an angle of more than zero degrees to said primary axis of said shank. - View Dependent Claims (9, 10)
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Specification