System and method for dual telemetry acoustic noise reduction

Patent metadata

Field	Value
Publication number	US-10526889-B2
Application number	US-201815864393-A
Country	US
Kind code	B2
Filing date	Jan 8, 2018
Priority date	Oct 20, 2014
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

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.

First claim

What is claimed is:

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.

2. The system of claim 1 , wherein the active noise blocking generator further comprises:
an anti-wave generator for generating the anti-wave responsive to an error signal, 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; and
error signal generation circuitry for generating the error signal responsive to differences between the first acoustical wave and the second acoustical wave.

3. The system of claim 2 , wherein the anti-wave generator further comprises:
a drive circuit for generating a drive signal responsive to the error signal; and
a piezoelectric transducer for generating the anti-wave responsive to the drive signal.

4. The system of claim 3 , wherein the drive circuit further comprises:
a least mean square processing circuit for determining the differences between the first acoustical wave and the second acoustical wave and generating a filter control signal responsive thereto; and
a filter for filtering the first acoustic wave responsive to the filter control signal to generate the error signal for driving the second acoustical wave to zero.

5. The system of claim 4 , wherein the filter further comprises an impulse response filter.

6. The system of claim 4 , wherein the filter further generates the error signal according to the equation Ŵ(n)=Ŵ(n−1)+∇·e(n)·x(n), where ∇ is an adjustment step, x(n) is the first acoustic wave and e(n) is the second acoustic wave.

7. A method for active noise blocking of acoustical waves traveling down a drill string, comprising:
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.

8. The method of claim 7 , wherein the step of generating further comprises:
generating an error signal responsive to differences between the first acoustical wave and the second 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; and
generating the anti-wave responsive to the error signal.

9. The method of claim 8 , wherein the step of generating the anti-wave further comprises:
generating a drive signal responsive to the error signal using a drive circuit; and
generating the anti-wave responsive to the drive signal using a piezoelectric transducer.

10. The method of claim 9 , wherein the step of generating the drive signal further comprises:
determining the differences between the first acoustical wave and the second acoustical wave using a least mean square processing circuit;
generating a filter control signal responsive to the determined differences using the least mean square processing circuit; and
filtering the first acoustic wave responsive to the filter control signal to generate the error signal for driving the second acoustical wave to zero.

11. The method of claim 10 , wherein the step of filtering further comprises generating the error signal according to the equation Ŵ(n)=Ŵ(n−1)+∇·e(n)·x(n), where ∇ is an adjustment step, x(n) is the first acoustic wave and e(n) is the second acoustic wave.

12. 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 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.

13. The system of claim 12 , further comprising a drive circuit for generating a drive signal for driving the piezoelectric transducer responsive to the error signal.

14. The system of claim 13 , wherein the drive circuit further comprises:
a least mean square processing circuit for determining the differences between the first acoustical wave and the second acoustical wave and generating a filter control signal responsive thereto; and
a filter for filtering the first acoustic wave responsive to the filter control signal to generate the error signal for driving the second acoustical wave to zero.

15. The system of claim 14 , wherein the filter further comprises an impulse response filter.

16. The system of claim 14 , wherein the filter further generates the error signal according to the equation Ŵ(n)=Ŵ(n−1)+∇·e(n)·x(n), where ∇ is an adjustment step, x(n) is the first acoustic wave and e(n) is the second acoustic wave.

Assignees

• Helmerich & Payne Tech Llc

Inventors

• Benson Todd W

Classifications

• E21B47/16 Primary

  through the drill string or casing {, e.g. by torsional acoustic waves} · CPC title

• E21B47/18

  through the well fluid {, e.g. mud pressure pulse telemetry} · CPC title

• E21B4/10

  continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts · CPC title

• E21B7/24

  Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E21B1/00) · CPC title

• E21B47/14

  using acoustic waves · CPC title