IP Library › Granted Patent US 12,270,258
Granted Patent B2
US 12,270,258 · App. 17/018,307 · Granted Apr 8, 2025

Viscous vibration damping of torsional oscillation

Inventor: Volker Peters (Wienhausen, DE)
Assignee: BAKER HUGHES OILFIELD OPERATIONS LLC
E21B17/076E21B17/0423E21B17/10F16F9/52F16F15/1216F16F15/129F16F15/173E21B17/006F16F15/16F16F15/18F16F2222/02F16F2232/02F16F2236/08F16F2238/024
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Quick Facts
Patent No.
US 12,270,258
App. No.
17/018,307
Granted
Apr 8, 2025
Kind
B2
Abstract

An apparatus for damping vibrations includes an inertial mass disposed in a cavity in a rotatable downhole component, the rotatable component configured to be disposed in a borehole in a subsurface formation, such as a resource bearing formation, the inertial mass coupled to a surface of the cavity by a damping fluid and configured to move within the cavity relative to the downhole component. The apparatus also includes a damping fluid disposed in the cavity between the inertial mass and an inner surface of the cavity, where rotational acceleration of the rotatable downhole component causes shear in the damping fluid to dissipate energy from rotational acceleration of the rotatable downhole component and causing the rotational acceleration to be reduced.

Claims (28)

1. An apparatus for damping torsional vibrations in a borehole string, the apparatus comprising:

a plurality of inertial masses disposed in a cavity in a rotatable downhole component, the rotatable downhole component configured to be disposed in a borehole in a subsurface formation, wherein each inertial mass of the plurality of inertial masses includes a ring or a ring segment, the plurality of inertial masses are coupled to the rotatable downhole component by a damping fluid, and the plurality of inertial masses are free to move relative to the rotatable downhole component such that a full rotation of each inertial mass of the plurality of inertial masses relative to the rotatable downhole component is permitted, wherein the plurality of inertial masses are arrayed along a rotational axis of the rotatable downhole component and are configured to rotate about the rotational axis of the rotatable downhole component; wherein

the damping fluid is disposed in the cavity and between the plurality of inertial masses and the rotatable downhole component, wherein rotational acceleration of the rotatable downhole component causes shear in the damping fluid to dissipate energy from the rotational acceleration of the rotatable downhole component and causes the rotational acceleration of the rotatable downhole component to be reduced.

2. The apparatus of claim 1 , further comprising a housing including the cavity, the housing disposed at the rotatable downhole component and rotationally fixed relative to the rotatable downhole component, wherein the housing is sealed.

3. The apparatus of claim 2 , further comprising a thermally conductive material, the thermally conductive material having a heat conductivity greater than at least one of a heat conductivity of the plurality of inertial masses, a heat conductivity of the damping fluid, a heat conductivity of the housing, and a heat conductivity of the rotatable downhole component, and the thermally conductive material configured to transfer the dissipated energy away from at least one of the plurality of inertial masses, the damping fluid, the housing, and the rotatable downhole component.

4. The apparatus of claim 1 , wherein the apparatus is configured to dampen the torsional vibrations at one or more selected frequencies.

5. The apparatus of claim 4 , wherein the one or more selected frequencies are dampened without a rigid spring element.

6. The apparatus of claim 1 , further comprising at least one bearing device configured to be disposed between at least one inertial mass of the plurality of inertial masses and the rotatable downhole component, the at least one bearing device configured to support movement of the at least one inertial mass relative to the rotatable downhole component.

7. The apparatus of claim 1 , wherein the apparatus has one or more properties configured to dampen the torsional vibrations at a selected vibrational frequency, the one or more properties including at least one of a selected density of at least one of the plurality of inertial masses, a selected weight of the at least one of the plurality of inertial masses, a selected roughness of an outer surface of the at least one of the plurality of inertial masses, a selected roughness of an inner surface of the cavity, a selected gap between the at least one of the plurality of inertial masses and the inner surface, a selected viscosity of the damping fluid, a selected density of the damping fluid, a selected compressibility of the damping fluid.

8. The apparatus of claim 1 , wherein at least one inertial mass of the plurality of inertial masses includes a first constituent component having a first density and a second constituent component having a second density, the second density greater than the first density.

9. The apparatus of claim 1 , wherein each inertial mass of the plurality of inertial masses is free to rotate relative to the cavity and is not restricted in a rotational direction by the rotatable downhole component, and the rotational acceleration of the rotatable downhole component is caused to reduce based only on viscous friction applied by the damping fluid.

10. The apparatus of claim 1 , wherein the apparatus is configured to reduce a gap between an inner surface of the cavity and at least one of the plurality of inertial masses in response to increasing temperature.

11. The apparatus of claim 1 , wherein the damping fluid is present between two or more of the plurality of inertial masses or between at least one of the plurality of inertial masses and a surface of the cavity.

12. The apparatus of claim 1 , wherein the plurality of inertial masses includes a first inertial mass configured to mainly dampen the torsional vibrations at a first frequency, and a second inertial mass configured to mainly dampen the torsional vibrations at a second frequency, the first frequency different than the second frequency.

13. The apparatus of claim 1 , further comprising at least one of a porous material, an elastic material, and a tortuous material between the plurality of inertial masses and the cavity.

14. The apparatus of claim 1 , wherein the damping fluid is configured to at least one of: over-proportionally dissipate the energy at high rotational accelerations of the rotatable downhole component above a selected acceleration, under-proportionally dissipate the energy at the high rotational accelerations of the rotatable downhole component, and proportionally dissipate the energy at the high rotational accelerations of the rotatable downhole component and/or at accelerations of the rotatable downhole component lower than the high rotational accelerations of the rotatable downhole component.

15. The apparatus of claim 1 , further comprising one or more side rings between two or more of the plurality of inertial masses and fixedly connected to the rotatable downhole component.

16. The apparatus of claim 1 , wherein the damping fluid has a viscosity between 10,000 and 1000,000 centistokes at room temperature and/or wherein a gap between at least one of the plurality of inertial masses and an inner surface of the cavity is in the range of 0.01 to 5 mm.

17. A method of damping torsional vibrations in a borehole string, the method comprising:

disposing a rotatable downhole component and a damping assembly in a borehole in a subsurface formation, the damping assembly including a cavity that is rotationally fixed relative to the rotatable downhole component, and a plurality of inertial masses disposed in the cavity and coupled to the rotatable downhole component by a damping fluid disposed between at least one of the plurality of inertial masses and the rotatable downhole component, wherein each inertial mass of the plurality of inertial masses includes a ring or a ring segment, and the plurality of inertial masses are free to move relative to the rotatable downhole component such that a full rotation of each of the plurality of inertial masses relative to the rotatable downhole component is permitted, wherein the plurality of inertial masses are arrayed along a rotational axis of the rotatable downhole component and are configured to rotate about the rotational axis of the rotatable downhole component;

performing an operation that includes rotating the rotatable downhole component and causing the torsional vibrations of the rotatable downhole component; and

damping at least partially the torsional vibrations of the rotatable downhole component, wherein the damping includes causing rotational acceleration of the rotatable downhole component to be reduced based on shear occurring in the damping fluid due to relative movement between the plurality of inertial masses and the rotatable downhole component.

18. The method of claim 17 , wherein the damping assembly includes a housing including the cavity, the housing rotationally fixed relative to the rotatable downhole component, wherein the housing is sealed.

19. The method of claim 18 , further comprising transferring dissipated energy away from the damping assembly by a thermally conductive material having a heat conductivity greater than at least one of a heat conductivity of the plurality of inertial masses, a heat conductivity of the damping fluid, a heat conductivity of the housing, and a heat conductivity of the rotatable downhole component.

20. The method of claim 17 , wherein the damping assembly includes a bearing device configured to be disposed between the at least one of the plurality of inertial masses and the rotatable downhole component, the bearing device configured to support the relative movement between the plurality of inertial masses and the rotatable downhole component.

21. The method of claim 17 , further comprising selecting a vibration frequency and selecting one or more properties configured to dampen the torsional vibrations at the selected vibration frequency, wherein the one or more properties including at least one of a density of the at least one of the plurality of inertial masses, a weight of the at least one of the plurality of inertial masses, a roughness of an outer surface of the at least one of the plurality of inertial masses, a roughness of an inner surface of the cavity, a gap between the at least one of the plurality of inertial masses and the inner surface, a viscosity of the damping fluid, a density of the damping fluid, and a compressibility of the damping fluid.

22. The method of claim 17 , wherein the damping assembly includes a first inertial mass configured to mainly dampen the torsional vibrations at a first frequency, and a second inertial mass configured to mainly dampen the torsional vibrations at a second frequency, the first frequency different than the second frequency.

23. The method of claim 17 , wherein the damping is based on viscous friction without elastic deformation of an associated spring element.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 11, 2020
From: PETERS, VOLKER
To: BAKER HUGHES OILFIELD OPERATIONS LLC
Reel/Frame 053747/0403 →
Continuity (5)
Provisional Application 62899331 · Sep 12, 2019
Provisional Application 62899354 · Sep 12, 2019
Provisional Application 62899332 · Sep 12, 2019
Provisional Application 62899291 · Sep 12, 2019
Related Publication 20210079976A1 · Mar 18, 2021
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