×

Methods and systems for mitigating drilling vibrations

  • US 8,589,136 B2
  • Filed: 05/28/2009
  • Issued: 11/19/2013
  • Est. Priority Date: 06/17/2008
  • Status: Active Grant
First Claim
Patent Images

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.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×