Torsional resonance prevention
AssigneeSchlumberger Technology Corporation
InventorBenjamin Jeffryes
Life of this patent
Estimating the term…
Abstract
A system for drilling a cavity in a medium. The system may include a drill bit, a processor, and a controller. The drill bit may be configured to rotate in the medium and remove at least a portion of the medium. The processor may be configured to receive a first set of data representative of a variable rotational speed of the drill bit during a length of time in the medium, and determine, based at least in part on the first set of data, a first resonant frequency of the variable rotational speed of the drill bit. The controller may be configured to receive a second set of data representative of the first resonant frequency of the variable rotational speed of the drill bit, and vary the force applied to the drill bit based at least in part on the second set of data.
Claims18
A system for drilling a cavity in a medium, wherein the system comprises:
- a drill bit, wherein the drill bit is configured to:
- rotate in the medium;
- and
- remove at least a portion of the medium to at least partially define the cavity;
- a drillstring coupled with the drill bit, wherein the drillstring is configured to:
- receive a rotational motion;
- rotate the drill bit;
- and
- apply a force to the drill bit;
- a processor, wherein the processor is configured to:
- receive a first set of data representative of a variable rotational speed of the drill bit during a length of time in the medium;
- and
- determine, based at least in part on the first set of data, a first resonant frequency of the variable rotational speed of the drill bit;
- and
- a controller, wherein the controlled is configured to:
- receive a second set of data representative of the first resonant frequency of the variable rotational speed of the drill bit;
- and
- vary the force applied to the drill bit by the drillstring using a band-stop filter to remove the first resonant frequency from the variance of force applied to the drill bit by the drillstring.
A method for drilling a cavity in a medium, wherein the method comprises:
- rotating a drill bit in the medium;
- applying a force to the drill bit;
- removing at least a portion of the medium to at least partially define the cavity;
- determining a first set of data based at least in part on the variable rotational speed of the drill bit during a length of time in the medium;
- determining, based at least in part on the first set of data, a second set of data representative of a first resonant frequency of the variable rotational speed of the drill bit;
- and
- varying the force applied to the drill bit based at least in part on the second set of data, wherein the step of varying the force applied to the drill bit based at least in part on the second set of data comprises filtering the first resonant frequency from a variance of force applied to the drill bit.
Dependencies are inferred from the claim text.