Steel tooth cutter element with expanded crest
First Claim
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1. A drill bit for cutting a formation, comprising:
- a bit body;
at least two rolling cone cutters rotatably mounted on said bit body, each rolling cone cutter having a cone axis;
a plurality of primary steel tooth cutter elements extending from each rolling cone cutter, said steel tooth cutter elements on at least two rolling cone cutters intermeshing;
at least one steel tooth cutter element having a root portion having a root length, a crest portion having a crest length, and a central portion having an expanded length, wherein said expanded length is greater than said root length.
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Abstract
A cutter element for a drill bit. The cutter element has a base portion and an extending portion and the extending portion has either a zero draft or a negative draft with respect to the base portion. The non-positive draft allows more of the borehole bottom to be scraped using fewer cutter elements. The cutter elements having non-positive draft can be either tungsten carbide inserts or steel teeth.
122 Citations
8 Claims
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1. A drill bit for cutting a formation, comprising:
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a bit body;
at least two rolling cone cutters rotatably mounted on said bit body, each rolling cone cutter having a cone axis;
a plurality of primary steel tooth cutter elements extending from each rolling cone cutter, said steel tooth cutter elements on at least two rolling cone cutters intermeshing;
at least one steel tooth cutter element having a root portion having a root length, a crest portion having a crest length, and a central portion having an expanded length, wherein said expanded length is greater than said root length. - View Dependent Claims (2, 3, 4)
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5. A drill bit for cutting a formation, comprising:
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a bit body;
at least two rolling cone cutters rotatably mounted on said bit body, each rolling cone cutter having a cone axis;
a plurality of primary steel tooth cutter elements extending from each rolling cone cutter, said steel tooth cutter elements on at least two rolling cone cutters intermeshing;
at least one steel tooth cutter element having a root portion having a root length and a crest portion having a crest length, wherein said crest length is greater than said root length. - View Dependent Claims (6, 7, 8)
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Specification