System and method for mitigating stick-slip
AssigneeHalliburton Energy Services, Inc.
InventorsZhijie Sun, Sujian Huang
Life of this patent
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Abstract
A method for drilling a well. The method may include detecting stick-slip vibrations at a frequency via a downhole sensor. The method may further include determining a reflection coefficient of a drill bit for the frequency based on at least one of a rotational speed of the drill bit or a torque of the drill bit. The method may also include determining a reflection coefficient of a top drive for the frequency based on at least one of a rotational speed of the top drive or a torque produced by the top drive. The method may further include adjusting a control system in electronic communication with the top drive based on the reflection coefficient of the drill bit for the frequency and the reflection coefficient of the top drive for the frequency.
Claims20
A method for drilling a well, the method comprising:
- controlling a top drive using a control system to rotate a drill string and a drill bit to drill the well;
- detecting stick-slip vibrations of the drill string at a frequency of the stick-slip vibrations caused by the rotation of the drill string and the drill bit via a downhole sensor;
- determining a reflection coefficient of the drill bit for the frequency based on at least one of a rotational speed of the drill bit or a torque of the drill bit;
- determining a reflection coefficient of the top drive for the frequency based on at least one of a rotational speed of the top drive or a torque produced by the top drive;
- and
- adjusting the control system based on the reflection coefficient of the drill bit for the frequency and the reflection coefficient of the top drive for the frequency to adjust the operation of the top drive to reduce or eliminate stick-slip of the drill string.
A system for drilling a well, the system comprising:
- a top drive operable to rotate a drill string and a drill bit;
- a downhole sensor positionable within the well and operable to detect stick-slip vibrations of the drill string at a frequency of the stick-slip vibrations caused by the rotation of the drill string and the drill bit;
- and
- a drill bit sensor operable to detect at least one of a rotational speed of the drill bit, or a torque of the drill bit;
- a control system in electronic communication with the top drive, the control system comprising a processor programmed to
- adjust the control system based on a determined reflection coefficient of the drill bit for the frequency based on at least one of a rotational speed of the drill bit or a torque of the drill bit and a reflection coefficient of the top drive for the frequency based on at least one of a rotational speed of the top drive or a torque produced by the top drive to adjust the operation of the top drive to reduce or eliminate stick-slip of the drill string.
A non-transitory computer readable medium comprising instructions which, when executed by a processor, enables the processor to perform a method for drilling a well, the method comprising:
- controlling a top drive using a control system to rotate a drill string and a drill bit to drill the well;
- detecting stick-slip vibrations of the drill string at a frequency of the stick-slip vibrations caused by the rotation of the drill string and the drill bit via a downhole sensor;
- determining a reflection coefficient of the drill bit for the frequency based on at least one of a rotational speed of the drill bit or a torque of the drill bit;
- determining a reflection coefficient of the top drive for the frequency based on at least one of a rotational speed of the top drive or a torque produced by the top drive;
- and
- adjusting the control system based on the reflection coefficient of the drill bit for the frequency and the reflection coefficient of the top drive for the frequency to adjust the operation of the top drive to reduce or eliminate stick-slip of the drill string.
Dependencies are inferred from the claim text.