Methods and systems for mitigating drilling vibrations
First Claim
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1. A method of designing a drill tool assembly for use in a drilling operation, the method comprising:
- obtaining drilling operations parameters regarding a drilling operation;
obtaining drill tool assembly data regarding at least one drill tool assembly design;
calculating a baseline solution of the at least one drill tool assembly design rotating at a uniform rotation speed in an absence of vibration using the obtained drilling operations parameters and the obtained drill tool assembly data;
constructing one or more linear frequency-domain models as a perturbation to the baseline solution;
wherein at least one of the one or more linear frequency-domain models includes a damping coefficient that depends on the baseline solution;
utilizing the at least one of the one or more linear frequency-domain models to calculate one or more vibrational indices characterizing an excitation response of the at least one drill tool assembly design for the obtained drilling operations parameters and the obtained drill tool assembly data;
utilizing the calculated one or more vibrational indices to evaluate a suitability of the at least one drill tool assembly design for the drilling operation; and
selecting a preferred drill tool assembly design from the at least one drill tool assembly design based at least in part on the calculated one or more vibrational indices of the at least one drill tool assembly design.
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Abstract
Methods and systems of reducing drilling vibrations include generation a vibration performance index using at least one frequency-domain model having a velocity-dependent friction relationship. The vibration performance index may be used to aid in the design or manufacture of a drill tool assembly. Additionally or alternatively, the vibration performance index may inform drilling operations to reduce vibrations.
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Citations
43 Claims
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1. A method of designing a drill tool assembly for use in a drilling operation, the method comprising:
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obtaining drilling operations parameters regarding a drilling operation; obtaining drill tool assembly data regarding at least one drill tool assembly design; calculating a baseline solution of the at least one drill tool assembly design rotating at a uniform rotation speed in an absence of vibration using the obtained drilling operations parameters and the obtained drill tool assembly data; constructing one or more linear frequency-domain models as a perturbation to the baseline solution;
wherein at least one of the one or more linear frequency-domain models includes a damping coefficient that depends on the baseline solution;utilizing the at least one of the one or more linear frequency-domain models to calculate one or more vibrational indices characterizing an excitation response of the at least one drill tool assembly design for the obtained drilling operations parameters and the obtained drill tool assembly data; utilizing the calculated one or more vibrational indices to evaluate a suitability of the at least one drill tool assembly design for the drilling operation; and selecting a preferred drill tool assembly design from the at least one drill tool assembly design based at least in part on the calculated one or more vibrational indices of the at least one drill tool assembly design. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A drill tool assembly design for use in a drilling operation, the drill tool assembly design comprising:
at least one downhole component;
wherein the at least one downhole component is selected to provide the drill tool assembly design with a preferred vibrational index, wherein the preferred vibrational index characterizes an excitation response of at least one tubular member based at least in part on drilling operations parameters and drill tool assembly data, wherein the preferred vibrational index is determined using one or more frequency-domain models, wherein at least one of the one or more frequency-domain models is constructed as a perturbation to a baseline solution of the drill tool assembly design rotating at a uniform rotation speed in an absence of vibration, wherein the baseline solution incorporates the drilling operations parameters and the drill tool assembly data, and wherein the at least one of the one or more frequency-domain models includes a damping coefficient that depends on the baseline solution.- View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of drilling a wellbore, the method comprising:
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obtaining drilling operations parameters regarding a drilling operation; obtaining drill tool assembly data regarding a drill tool assembly design to be used in the drilling operation; calculating a baseline solution of the drill tool assembly design rotating at a uniform rotation speed in an absence of vibration using the obtained drilling operations parameters and the obtained drill tool assembly data; constructing one or more linear frequency-domain models as a perturbation to the baseline solution;
wherein at least one of the one or more linear frequency-domain models includes a damping coefficient that depends on the baseline solution;utilizing at least one of the one or more linear frequency-domain models to calculate one or more vibrational indices characterizing an excitation response of the drill tool assembly design under a range of available operating conditions for the obtained drilling operations parameters and the obtained drill tool assembly data; determining preferred drilling operating conditions to mitigate vibrations based at least in part on the calculated one or more of the vibrational indices; drilling a wellbore using the drill tool assembly design while monitoring drilling operating conditions; and adjusting drilling operations to maintain drilling operating conditions at least substantially within a range of the determined preferred drilling operating conditions. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method of mitigating drill tool assembly vibrations that occur during drilling operations, the method comprising:
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obtaining data regarding drilling parameters related to one or more drilling operations; calculating a baseline solution for the one or more drilling operations of a drill tool assembly design rotating at a uniform speed in an absence of vibration using the obtained data regarding drilling parameters; constructing one or more linear frequency-domain models as a perturbation to the baseline solution;
wherein at least one of the one or more linear frequency-domain models includes damping coefficients that depend on the baseline solution;utilizing the at least one of the one or more linear frequency-domain models to calculate one or more vibrational indices characterizing an excitation response of the drill tool assembly design for the obtained data regarding drilling parameters; utilizing the calculated one or more vibrational indices to identify at least one drilling parameter change to mitigate drill tool assembly vibrations; and adjusting one or more drilling parameters based at least in part on at least one of the calculated one or more vibrational indices and the identified at least one drilling parameter change. - View Dependent Claims (40, 41, 42, 43)
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Specification