US 2009/0266608 A1 · TORSIONAL RESONANCE PREVENTION

Abstract

According to the invention, a system for drilling a cavity in a medium is disclosed. 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.

Claims23

Dependent claims

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 based at least in part on the second set of data.

15 more elements

Dependencies are inferred from the claim text.

Torsional resonance prevention

Life of this patent

Torsional resonance prevention

Life of this patent

Abstract

Claims23