System and method for dual telemetry acoustic noise reduction
First Claim
1. A system for active noise blocking of acoustical waves traveling down a drill string, comprising:
- a first accelerometer located at a first position on the drill string below a top drive of drilling rig for detecting a first acoustical wave traveling down the drill string;
a second accelerometer located at a second position on the drill string below the first position on the drill string for detecting a second acoustical wave traveling down the drill string after the first acoustical wave has interacted with an anti-wave;
an active noise blocking generator for generating the anti-wave responsive to the detected first acoustical wave and the detected second acoustical wave and applying the anti-wave to the first acoustical wave, wherein the anti-wave is generated to drive the second acoustical wave to zero responsive to application of the anti-wave to the first acoustical wave to reduce noise; and
a receiver adapted to receive telemetry signals from a downhole tool, wherein when the receiver receives a telemetry signal from the downhole tool, the active noise blocking generator ceases generating the anti-wave.
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Accused Products
Abstract
A system for active noise blocking of top drive acoustical waves includes a first accelerometer for detecting a first acoustical wave generated by the top drive of a drilling rig. A second accelerometer detects a second acoustical wave after the first acoustical wave has interacted with an anti-wave. An active noise blocking generator generates the anti-wave responsive to the detected first acoustical wave and the detected second acoustical wave and applies the anti-wave to the first acoustical wave. The anti-wave is generated to drive the second acoustical wave to zero responsive to application of the anti-wave to the first acoustical wave.
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Citations
16 Claims
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1. A system for active noise blocking of acoustical waves traveling down a drill string, comprising:
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a first accelerometer located at a first position on the drill string below a top drive of drilling rig for detecting a first acoustical wave traveling down the drill string; a second accelerometer located at a second position on the drill string below the first position on the drill string for detecting a second acoustical wave traveling down the drill string after the first acoustical wave has interacted with an anti-wave; an active noise blocking generator for generating the anti-wave responsive to the detected first acoustical wave and the detected second acoustical wave and applying the anti-wave to the first acoustical wave, wherein the anti-wave is generated to drive the second acoustical wave to zero responsive to application of the anti-wave to the first acoustical wave to reduce noise; and a receiver adapted to receive telemetry signals from a downhole tool, wherein when the receiver receives a telemetry signal from the downhole tool, the active noise blocking generator ceases generating the anti-wave. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for active noise blocking of acoustical waves traveling down a drill string, comprising:
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detecting a first acoustical wave traveling down the drill string at a first position on the drill string below the top drive; detecting a second acoustical wave traveling down the drill string after the first acoustical wave has interacted with an anti-wave at a second position on the drill string below the first position on the drill string; generating the anti-wave responsive to the detected first acoustical wave at the first point on the drill sting and the detected second acoustical wave at the second position on the drill string; applying the anti-wave to the first acoustical wave; driving the second acoustical wave to zero responsive to application of the anti-wave to the first acoustical wave to reduces noise; receiving a plurality of telemetry signals from a downhole tool; and ceasing generating the anti-wave while the receiver is receiving one of the plurality of telemetry signals from the downhole tool. - View Dependent Claims (8, 9, 10, 11)
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12. A system for active noise blocking of acoustical waves traveling down a drill string, comprising:
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a first accelerometer located at a first position on the drill string below a top drive of a drilling rig for detecting a first acoustical wave traveling down the drill string; a second accelerometer located at a second position on the drill string below the first position on the drill string for detecting a second acoustical wave traveling down the drill string after the first acoustical wave has interacted with an anti-wave; error signal generation circuitry for generating an error signal responsive to differences between the detected first acoustical wave at the first position on the drill string and the detected second acoustical wave at the second position on the drill string; a piezoelectric transducer for generating an anti-wave responsive to the error signal and applying the anti-wave to the first acoustical wave, the error signal representing an amplitude and phase of the anti-wave necessary to interact with the first acoustical wave and drive the second acoustical wave to zero to reduce noise; and a receiver for receiving one or more telemetry signals from a downhole tool wherein the piezoelectric transducer and error signal generation circuitry cease operating while the receiver receives the one or more telemetry signals from the downhole tool. - View Dependent Claims (13, 14, 15, 16)
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Specification