Methods for modeling, designing, and optimizing the performance of drilling tool assemblies
First Claim
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1. A method for determining a performance of a drilling tool assembly, comprising:
- a. generating a geometric model of the drilling tool assembly and a geometric well trajectory model of an earth formation, wherein the drilling tool assembly includes a drill bit and at least one section of drill pipe;
b. simulating dynamically the drilling tool assembly drilling the earth formation;
c. determining a dynamic response of the drilling tool assembly interaction with the earth formation, wherein the dynamically simulating comprises using at least one datum of a first increment of a simulation in a subsequent increment of the simulation;
d. determining forces acting on the drill bit in the drilling tool assembly;
e. graphically displaying at least one of the drilling tool assembly interaction with the earth formation and the forces acting on the drill bit, andf. adjusting a parameter of the drilling tool assembly based on the graphically displaying, and repeating the simulating, the determining the dynamic response of the drilling tool assembly interaction, and the determining the forces acting on the drill bit wherein the simulating comprises;
a. incrementally rotating the drill tool assembly in the earth formation; and
b. calculating an interference between the drilling tool assembly and the earth formation during the incremental rotation;
wherein the calculating the interference between the drilling tool assembly and the earth formation comprises a. determining interferences between cutting elements on the drill bit and the earth formation; and
b. determining forces acting on the cutting elements based on the determined interferences;
calculating cutter wears based on the forces on the cutting elements, the interferences between the cutting elements and the earth formation, and a wear model; and
modifying a shape of the cutters based on the calculated cutter wears.
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Abstract
A method for designing a drilling tool assembly, having a drill bit disposed at one end includes defining initial drilling tool assembly design parameters; calculating a dynamic response of the drilling tool assembly; adjusting a value of a drilling tool assembly design parameter; and repeating the calculating and the adjusting until a drilling tool assembly performance parameter is optimized.
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Citations
15 Claims
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1. A method for determining a performance of a drilling tool assembly, comprising:
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a. generating a geometric model of the drilling tool assembly and a geometric well trajectory model of an earth formation, wherein the drilling tool assembly includes a drill bit and at least one section of drill pipe; b. simulating dynamically the drilling tool assembly drilling the earth formation; c. determining a dynamic response of the drilling tool assembly interaction with the earth formation, wherein the dynamically simulating comprises using at least one datum of a first increment of a simulation in a subsequent increment of the simulation; d. determining forces acting on the drill bit in the drilling tool assembly; e. graphically displaying at least one of the drilling tool assembly interaction with the earth formation and the forces acting on the drill bit, and f. adjusting a parameter of the drilling tool assembly based on the graphically displaying, and repeating the simulating, the determining the dynamic response of the drilling tool assembly interaction, and the determining the forces acting on the drill bit wherein the simulating comprises;
a. incrementally rotating the drill tool assembly in the earth formation; and
b. calculating an interference between the drilling tool assembly and the earth formation during the incremental rotation;
wherein the calculating the interference between the drilling tool assembly and the earth formation comprises a. determining interferences between cutting elements on the drill bit and the earth formation; and
b. determining forces acting on the cutting elements based on the determined interferences;
calculating cutter wears based on the forces on the cutting elements, the interferences between the cutting elements and the earth formation, and a wear model; and
modifying a shape of the cutters based on the calculated cutter wears. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification