Balancing of drill bits
AssigneeSmith International, Inc.
InventorsLuca Tedeschi, Gary Portwood, Zhehua Zhang
Life of this patent
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Abstract
A method including of manufacturing a drill bit includes inputting bit characteristics into a simulator. The bit characteristics may include a drill bit mass, coordinates of the bit center of gravity, and an inertia tensor of the bit. The bit center of gravity and a vector of the inertia tensor may be aligned with a bit axis in the simulator. Based on the alignment of the center of gravity and the inertia tensor with the bit axis, new bit characteristics may be determined. A drill bit with the new bit characteristics may be produced.
Claims21
A method comprising:
- inputting drill bit characteristics into a simulator, wherein drill bit characteristics comprise a drill bit mass, coordinates of the drill bit center of gravity, and an inertia tensor of the drill bit;
- aligning the drill bit center of gravity and a vector of the inertia tensor with a bit axis in the simulator, the bit axis running longitudinally through the center of the drill bit;
- determining new drill bit characteristics based on the aligning the drill bit center of gravity and the inertia tensor with the bit axis;
- and
- producing a drill bit with the new bit characteristics.
A method comprising:
- assembling a drill bit;
- inputting drill bit characteristics into a simulator;
- performing a mass balance with the simulator;
- determining new drill bit characteristics comprising a new mass distribution;
- and
- modifying the drill bit by adding or removing mass according to the new mass distribution.
A drill bit comprising:
- a body;
- two legs mounted to the body;
- two journals, one of the two journals mounted to each of the two legs, the two journals having a cone separation angle of less than 180 degrees;
- and
- two roller cones, one of the two roller cones mounted to each of the two journals,
- wherein the bit has a center of gravity substantially aligned with a bit axis.
A method comprising:
- producing a two cone roller cone drill bit having a cone separation angle of less than 180 degrees,
- wherein the producing comprises aligning a center of gravity of the two cone roller cone drill bit with a bit axis.
Dependencies are inferred from the claim text.