Downhole test signals for identification of operational drilling parameters
US10746013B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 2015 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Feb 20, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2270/86
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for selecting drilling parameters for drilling a borehole penetrating the earth with a drill string includes: varying a frequency of an excitation force applied to the drill string using an excitation device controlled by a drill string controller and measuring vibration-related amplitudes of the drill string due to the applied excitation force using a vibration sensor to provide amplitude measurements. The method further includes determining one or more modal properties comprising one or more eigenfrequencies of the drill string using the amplitude measurements and selecting drilling parameters that apply an excitation force at a frequency that avoids a selected range of frequencies that bound the one or more eigenfrequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.