# US 2025/0084752 A1 · Mitigation of severe dynamic vibrations via stick slip promotion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0084752 A1 - Document ID: US20250084752A1 - Status: Published application - Kind: A1 - Application number: 18/830,774 - Filed: 2024-09-11 - Published: 2025-03-13 - Earliest claimed: 2023-09-11 - Assignees: Schlumberger Technology Corporation - Applicants: Schlumberger Technology Corporation - Inventors: Ashley Bernard Johnson; Nathaniel Wicks; Amandine Battentier - Web page: https://patentgrep.com/patent/US20250084752A1 ## CPC - E21B 44/04: in response to the torque of the drive {; Measuring drilling torque (E21B44/06 takes precedence; measuring stresses in a well bore pipe E21B47/007)} - E21B 44/00: Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A method for drilling a subterranean wellbore includes rotating a bottom hole assembly in the wellbore to drill and measuring a magnitude of a potentially damaging vibrational component. The measured magnitude is compared to a corresponding threshold and the drill string rotation may be perturbed to increase stick slip when the measured magnitude exceeds the threshold. ## Claims ### Claim 1 A method for drilling a subterranean wellbore comprises: rotating a drill string in a wellbore; measuring at least one of a whirl, a high frequency torsional oscillation, and a harmonic stick slip oscillation while rotating; comparing the at least one of the whirl, the high frequency torsional oscillation, and the harmonic stick slip oscillation with a corresponding threshold; and perturbing the rotating to increase stick slip when the at least one of the whirl, the high frequency torsional oscillation, and the harmonic stick slip oscillation exceeds the corresponding threshold. ### Claim 2 (depends on 1) The method of claim 1, wherein the perturbing comprises perturbing a rotation rate of the drill string or a torque applied to the drill string. ### Claim 3 (depends on 1) The method of claim 1, wherein the perturbing comprises injecting a low amplitude torque or a rotation speed at a fundamental frequency to trigger the stick slip at the fundamental frequency. ### Claim 4 (depends on 1) The method of claim 1, wherein the perturbing comprises setting the rotation rate of the drill string equal to a fundamental stick slip frequency. ### Claim 5 (depends on 1) The method of claim 1, wherein the measuring comprises: measuring lateral vibrations in a bottom hole assembly and torsional oscillations at a top drive, estimating the whirl from the measured lateral vibrations, and estimating the high frequency torsional oscillation and the harmonic stick slip oscillation from the measured torsional oscillations; the comparing comprises comparing the whirl with a corresponding whirl threshold, comparing the high frequency torsional oscillation with a corresponding high frequency torsional oscillation threshold, and comparing the harmonic stick slip oscillation with a corresponding harmonic stick slip oscillation threshold; and the perturbing comprises perturbing a rotation rate of the drill string or a torque applied to the drill string when at least one of the whirl, the high frequency torsional oscillation, and the harmonic stick slip oscillation exceeds the corresponding threshold. ### Claim 6 (depends on 1) The method of claim 1, wherein: the measuring comprises measuring lateral vibrations in a bottom hole assembly and estimating the whirl from the measured lateral vibrations; the comparing comprises comparing the estimated whirl with a corresponding whirl threshold; and the perturbing comprises perturbing a rotation rate of the drill string or a torque applied to the drill string when the estimated whirl exceeds the whirl threshold. ### Claim 7 (depends on 6) The method of claim 6, wherein the whirl is estimated from a maximum radial acceleration in the bottom hole assembly. ### Claim 8 (depends on 1) The method of claim 1, wherein: the measuring comprises measuring torsional oscillations at a top drive and estimating the high frequency torsional oscillation from the measured torsional oscillations; the comparing comprises comparing the estimated high frequency torsional oscillation with a corresponding high frequency torsional oscillation threshold; and the perturbing comprises perturbing a rotation rate of the drill string or a torque applied to the drill string when the estimated high frequency torsional oscillation exceeds the high frequency torsional oscillation threshold. ### Claim 9 (depends on 1) The method of claim 1, wherein: the measuring comprises measuring torsional oscillations at a top drive and estimating the harmonic stick slip oscillation from the measured torsional oscillations; the comparing comprises comparing the estimated harmonic stick slip oscillation with a corresponding harmonic stick slip oscillation threshold; and the perturbing comprises perturbing a rotation rate of the drill string or a torque applied to the drill string when the estimated harmonic stick slip oscillation exceeds the harmonic stick slip oscillation threshold. ### Claim 10 (depends on 9) The method of claim 9, wherein: the harmonic stick slip oscillation is estimated by transforming the measuring torsional oscillations to a frequency domain; and the estimated harmonic stick slip oscillation comprises a fifth order or higher harmonic oscillation. ### Claim 11 A system for drilling a subterranean wellbore, the system comprising: a drill string rotating in a wellbore; and a processor configured to: receive at least one of a measured whirl, a measured high frequency torsional oscillation, and a measured harmonic stick slip oscillation while the drill string rotates in the wellbore; compare the at least one of the measured whirl, the measured high frequency torsional oscillation, and the measured harmonic stick slip oscillation with a corresponding threshold; and recommend changes to a rotation of the drill string to promote stick slip when the at least one of the whirl, the high frequency torsional oscillation, and the harmonic stick slip oscillation exceeds the corresponding threshold. ### Claim 12 (depends on 11) The system of claim 11, wherein the processor is further configured to: receive a measured stick slip amplitude while the drill string rotates in the wellbore; compare the measured stick slip amplitude with a stick slip threshold; and recommend changes to a rotation of the drill string to promote stick slip when the measured stick slip amplitude is less than the stick slip threshold. ### Claim 13 (depends on 11) The system of claim 11, wherein: the receive comprises receive each of a measured whirl, a measured high frequency torsional oscillation, and a measured harmonic stick slip oscillation while the drill string rotates in the wellbore; the compare comprises compare the measured whirl with a corresponding whirl threshold, compare the measured high frequency torsional oscillation with a corresponding high frequency torsional oscillation threshold, and compare the measured harmonic stick slip oscillation with a corresponding harmonic stick slip oscillation threshold; and recommend changes to a rotation of the drill string to promote stick slip when at least one of the whirl, the high frequency torsional oscillation, and the harmonic stick slip oscillation exceeds the corresponding threshold. ### Claim 14 (depends on 11) The system of claim 11, wherein the recommended changes to the rotation comprise recommended changes to the rotation rate or the torque. ### Claim 15 (depends on 11) The system of claim 11, wherein the processor is further configured to automatically implement the recommended changes to the rotation of the drill string. ### Claim 16 A method for drilling a subterranean wellbore comprises: rotating a drill string in a wellbore; measuring a stick slip amplitude while rotating the drill string; comparing the measured stick slip amplitude with a stick slip threshold; and perturbing the rotating to increase stick slip when the measured stick slip amplitude is less than the stick slip threshold. ### Claim 17 (depends on 16) The method of claim 16, wherein: the stick slip threshold comprises a first stick slip threshold and a second stick slip threshold, wherein the second stick slip threshold is greater than the first stick slip threshold; and the perturbing comprises perturbing the rotating to increase the stick slip when the measured stick slip amplitude is less than the first stick slip threshold and perturbing the rotating to decrease the stick slip when the measured stick slip amplitude is greater than the second stick slip threshold. ### Claim 18 (depends on 16) The method of claim 16, wherein the perturbing comprises perturbing a rotation rate of the drill string or a torque applied to the drill string. ### Claim 19 (depends on 18) The method of claim 18, wherein the perturbing comprises setting the rotation rate of the drill string equal to a fundamental stick slip frequency. ### Claim 20 (depends on 16) The method of claim 16, further comprising: measuring at least one of a whirl, a high frequency torsional oscillation, and a harmonic stick slip oscillation while rotating; comparing the at least one of the whirl, the high frequency torsional oscillation, and the harmonic stick slip oscillation with a corresponding threshold; and perturbing the rotating to increase stick slip when the at least one of the whirl, the high frequency torsional oscillation, and the harmonic stick slip oscillation with a corresponding threshold.