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US 2006/0224368 A1Published application
Force-balanced roller-cone bits, systems, drilling methods, and design methods
OwnerShilin Cheninventor
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Abstract
Roller cone drilling wherein the bit optimization process equalizes the downforce (axial force) for the cones (as nearly as possible, subject to other design constraints). Bit performance is significantly enhanced by equalizing downforce.
Claims4
A method of designing a roller cone drill bit, comprising:
- (a) calculating force balance conditions of a bit;
- (b) defining design variables;
- (c) determining lower and upper bounds for the design variables;
- (d) defining objective functions mathematically as a function of the design variables;
- (e) defining constraint functions mathematically as a function of the design variables;
- (f) performing an optimization means;
- and
- (e) evaluating an optimized cutting structure by modeling.
5 more elements
Dependencies are inferred from the claim text.