Multi-layer drill bit apparatus and systems
AssigneeHalliburton Energy Services, Inc.
InventorShilin Chen
Life of this patent
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Abstract
A downhole drilling system comprises a drill string and a drill bit coupled to the drill string. The drill bit comprises a bit body with primary and secondary blades disposed thereon. Some of the secondary blades are alternately disposed between some of the primary blades. Two first layer cutting elements are disposed on different ones of the primary blades, and substantially diametrically opposed to each other along a first track set radius of the bit body, while two second layer cutting elements are disposed on different ones of the secondary blades, and substantially diametrically opposed to each other along the first track set radius. The second layer cutting elements are sized to provide a selected amount of underexposure greater than zero with respect to the first layer cutting elements.
Claims19
A downhole drill bit, comprising:
- a bit body;
- primary blades disposed on an exterior portion of the bit body, each of the primary blades having a first nearest end to a rotational axis of the bit body at a first distance from the rotational axis;
- secondary blades disposed on the exterior portion of the bit body, each of the secondary blades having a second nearest end to the rotational axis at a second distance from the rotational axis, the second distance greater than the first distance, wherein at least some of the secondary blades are alternately disposed between some of the primary blades;
- two first layer cutting elements disposed on different ones of a first set of the primary blades, the two first layer cutting elements substantially diametrically opposed to each other along a circumference of a first track set radius of the bit body;
- and
- two second layer cutting elements disposed on different ones of a second set of the secondary blades, the two second layer cutting elements substantially diametrically opposed to each other along the circumference of the first track set radius of the bit body, the second layer cutting elements sized to provide a selected amount of underexposure greater than zero with respect to the first layer cutting elements, wherein an outer edge of a cutting surface of at least one of the first layer cutting elements or the second layer cutting elements has a generally rectangular geometric shape with a distal end terminating in an arc.
A downhole drilling system, comprising:
- a drill string;
- and
- a drill bit coupled to the drill string, the drill bit comprising:
- a bit body;
- primary blades disposed on an exterior portion of the bit body, each of the primary blades having a first nearest end to a rotational axis of the bit body at a first distance from the rotational axis;
- secondary blades disposed on the exterior portion of the bit body, each of the secondary blades having a second nearest end to the rotational axis at a second distance from the rotational axis, the second distance greater than the first distance, wherein at least some of the secondary blades are alternately disposed between some of the primary blades;
- two first layer cutting elements disposed on different ones of a first set of the primary blades, the two first layer cutting elements substantially diametrically opposed to each other along a circumference of a first track set radius of the bit body;
- and
- two second layer cutting elements disposed on different ones of a second set of the secondary blades, the two second layer cutting elements substantially diametrically opposed to each other along the circumference of the first track set radius of the bit body, the second layer cutting elements sized to provide a selected amount of underexposure greater than zero with respect to the first layer cutting elements, wherein an outer edge of a cutting surface of at least one of the first layer cutting elements or the second layer cutting elements has a generally rectangular geometric shape with a distal end terminating in an arc.
Dependencies are inferred from the claim text.