Dampers for mitigation of downhole tool vibrations
AssigneeBaker Hughes, A Ge Company, LLC
InventorAndreas Hohl
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Abstract
Systems and methods for damping torsional oscillations of downhole systems are described. The systems include a downhole string comprising a disintegration device and a damping system at least one of in and on the downhole string, the damping system configured to damp torsional oscillations of the downhole string. The methods include installing a damping system at least one of on and in the downhole system with the downhole system including a downhole string having a disintegration device and the damping system is configured to damp torsional oscillation of the downhole string.
Claims22
A system for damping torsional oscillations of downhole systems, the system comprising:
- a downhole string comprising a disintegration device;
- and
- a damping system at least one of in and on the disintegration device, the damping system configured to damp torsional oscillations of the downhole string, the damping system comprising at least one damper element, wherein the at least one damper element is configured to move relative to the disintegration device with a velocity that is a sum of a periodic velocity fluctuation having an amplitude and a mean velocity.
A method of damping torsional oscillations of a downhole system in a borehole, the method comprising:
- connecting a disintegration device to a downhole string to make up at least a portion of the downhole system;
- installing a damping system at least one of on and in the disintegration device, the damping system configured to damp torsional oscillation of the downhole string, the damping system comprising at least one damper element,
- wherein the at least one damper element is configured to move relative to the disintegration device with a velocity that is a sum of a periodic velocity fluctuation having an amplitude and a mean velocity.
A system for damping torsional oscillations of downhole systems, the system comprising:
- a downhole string comprising a disintegration device having at least one blade;
- and
- a damping system arranged in the at least one blade and having at least one damper element, the damping system configured to damp torsional oscillations of the downhole string,
- wherein the at least one damper element comprises:
- a housing configured to be installed within the at least one blade;
- and
- a mass element arranged within the housing and movable therein.
Dependencies are inferred from the claim text.