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US 9,850,717 B2Granted
Methods for designing fixed cutter bits and bits made using such methods
AssigneeSmith International, Inc.
InventorsZhehua Zhang, Jiaqing Yu
Life of this patent
Estimating the term…
Abstract
Embodiments disclosed herein relate to a method for analyzing a fixed cutter drill bit, said method including selecting a cutter; selecting an earth formation; simulating drilling performance of the fixed cutter bit having at least once cutter thereon; performing finite element analysis using outputs from the simulating; and outputting stress on the at least one cutter.
Claims14
A method for designing and manufacturing a fixed cutter drill bit, said method comprising:
- (i) designing a fixed cutter drill bit, wherein designing includes analyzing the fixed cutter drill bit by at least:
- (a) selecting at least one cutter;
- (b) selecting an earth formation;
- (c) simulating drilling performance of the fixed cutter drill bit having the at least one cutter thereon, wherein simulating drilling performance simulates the fixed cutter drill bit drilling the earth formation;
- (d) performing finite element analysis using outputs from the simulated drilling performance;
- (e) resolving the outputs into a component force normal to a cutter face of the at least one cutter and a component force tangent to the cutter face of the at least one cutter, wherein resolving the outputs further includes resolving the force tangent to the cutter face into a cutting frictional force on a diamond table of the at least one cutter and a tangent force applied to a bevel of the at least one cutter;
- (f) determining a stress on the at least one cutter based on the finite element analysis;
- and
- (g) outputting the stress on the at least one cutter;
- and
- (ii) manufacturing the fixed cutter drill bit following designing the fixed cutter drill bit.
8 more elements
A method for designing a fixed cutter drill bit, said method comprising:
- (a) selecting bit design parameters;
- (b) selecting an earth formation;
- (e) selecting drilling parameters;
- (d) simulating drilling performance of the fixed cutter drill bit having a plurality of cutters thereon, wherein simulating drilling performance simulates the fixed cutter drill bit drilling the earth formation;
- (e) performing finite element analysis using outputs from the simulated drilling performance, the finite element analysis using a non-uniform depth of cut for the plurality of cutters of the fixed cutter drill bit;
- (f) determining a stress on the plurality of cutters based on the finite element analysis;
- (g) comparing a stress of at least one cutter of the plurality of cutters based on the non-uniform depth of cut to a stress resulting from an average depth of cut;
- (h) outputting the stress on the at least one cutter;
- and
- (i) manufacturing the fixed cutter drill bit based on the selected bit design parameters and including the plurality of cutters.
7 more elements
Dependencies are inferred from the claim text.