Force-balanced roller-cone bits, systems, drilling methods, and design methods
OwnerShilin Cheninventor
Life of this patent
Estimating the term…
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.
Claims25
A method for designing a roller cone drill bit having a plurality of roller cones and initial design parameters, comprising:
- simulating drilling an earth formation with the bit and determining as a result of the simulating, a distribution of axial force on the bit;
- adjusting at least one of the initial design parameters;
- repeating the simulating drilling;
- and
- repeating the adjusting, the simulating and the determining until the distribution of axial force is optimized.
A method for designing a roller cone drill bit having a plurality of roller cones and initial design parameters, comprising:
- simulating drilling an earth formation with the bit and determining for each of the roller cones as a result of the simulating, a work performed by each roller cone;
- adjusting at least one of the initial design parameters;
- repeating the simulating drilling;
- and
- repeating the adjusting, the simulating and the determining until the work performed is substantially the same for each one of the roller cones.
A method for designing a roller cone drill bit having a plurality of roller cones and initial design parameters, comprising:
- simulating drilling an earth formation with the bit and determining for each of the roller cones as a result of the simulating, a projected area of contact of cutting elements on each roller cone with the earth formation;
- adjusting at least one of the initial design parameters;
- repeating the simulating drilling;
- and
- repeating the adjusting, the simulating and the determining until the projected area is substantially the same for each one of the roller cones.
A method for designing a roller cone drill bit having a plurality of roller cones and initial design parameters, comprising:
- simulating drilling an earth formation with the bit and determining for each of the roller cones as a result of the simulating, a depth of penetration of cutting elements on each roller cone with the earth formation;
- adjusting at least one of the initial design parameters;
- repeating the simulating drilling;
- and
- repeating the adjusting, the simulating and the determining until the depth of penetration is substantially the same for each one of the roller cones.
A method for designing a roller cone drill bit having a plurality of roller cones and initial design parameters, comprising:
- simulating drilling an earth formation with the bit;
- determining as a result of the simulating an axial force on each one of the roller cones;
- adjusting at least one of the initial design parameters;
- repeating the simulating drilling;
- and
- repeating the adjusting, the simulating and the determining until the axial force on any of the roller cones is substantially the same as the axial force on any other one of the roller cones.
Dependencies are inferred from the claim text.