Cutting element placement on a fixed cutter drill bit to reduce diamond table fracture
AssigneeBaker Hughes Incorporated
InventorsDavid Gavia, Floyd C. Felderhoff, Matthew R. Isbell, Michael L. Doster
Life of this patent
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Abstract
A rotary drag bit includes a primary cutter row comprising at least one primary cutter mounted on a blade, at least some cutters in the primary cutter row having a portion of a cutting surface thereof covered by a portion of the blade. A backup cutter row comprising at least one cutter may also be included, and at least a portion of a cutting surface of at least some cutters in the backup cutter row is covered by a portion of the blade. Enhanced support for cutters is provided against impact loading.
Claims25
A rotary drag bit, comprising:
- a bit body with a face and an axis;
- at least one blade having a leading face and a trailing face, the at least one blade extending longitudinally and radially outward over the face of the bit body;
- and
- a primary cutter row comprising at least one primary cutter, the at least one primary cutter including a cutting surface having a portion thereof covered by a portion of the at least one blade, the at least one primary cutter protruding at least partially from the at least one blade and located to traverse a cutting path upon rotation of the bit body about the axis to engage a formation upon movement along the cutting path.
A rotary drag bit, comprising:
- a bit body with a face and an axis;
- at least one blade having a leading face and a trailing face, the at least one blade extending longitudinally and radially outward over the face of the bit body;
- a primary cutter row comprising at least one primary cutter, the at least one primary cutter including a cutting surface having a portion thereof covered by a portion of the at least one blade, the at least one cutter protruding at least partially from the at least one blade and located to traverse a cutting path upon rotation of the bit body about the axis to engage a formation upon movement along the cutting path;
- and
- a backup cutter row comprising at least one trailing backup cutter, the at least one trailing backup cutter including a cutting surface protruding at least partially from the at least one blade located to traverse a cutting path upon rotation of the bit body about the axis to engage a formation upon movement along the cutting path.
A rotary drag bit, comprising:
- a bit body with a face and an axis;
- at least one blade having a leading face and a trailing face, the at least one blade extending longitudinally and radially outward from the face of the bit body, a portion of the leading face comprises a chamfer extending along an outer extent thereof;
- a primary cutter row comprising at least one primary cutter including a cutting surface having a portion thereof covered by a portion of the at least one blade, the at least one cutter protruding at least partially from the at least one blade and located to traverse a cutting path upon rotation of the bit body about the axis to engage a formation upon movement along the cutting path;
- and
- a backup cutter row comprising at least one trailing backup cutter including a cutting surface having a portion thereof covered by a portion of the at least one blade, protruding at least partially from the at least one blade located to traverse a cutting path upon rotation of the bit body about the axis to engage a formation upon movement along the cutting path.
Dependencies are inferred from the claim text.