Systems and methods for determining tubing deviations

Patent metadata

Field	Value
Publication number	US-11668851-B2
Application number	US-202117200001-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 12, 2021
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

A method for determining a tubing deviation from nuclear measurement data includes acquiring neutron measurement data from a wellbore. The method also includes identifying one or more features from the neutron measurement data. The method further includes determining, based at least in part on a pattern matching algorithm, that the one or more features are indicative of a tubular deviation. The method also includes determining, based at least in part on a comparison between the one or more features, a deviation amount.

First claim

The invention claimed is:

1. A method for determining a tubing deviation from nuclear measurement data, comprising:
acquiring neutron measurement data from a wellbore;
identifying one or more features from the neutron measurement data;
determining, based at least in part on a pattern matching algorithm, that the one or more features are indicative of a tubular deviation; and
determining, based at least in part on a comparison between the one or more features, a deviation amount.

2. The method of claim 1 , wherein the one or more features are represented by an increased neutron count rate.

3. The method of claim 2 , wherein the increased neutron count rate is attributed to a first detector of an array of detectors, the increased neutron count rate being a threshold quantity greater than a count rate of an adjacent detector of the array of detectors.

4. The method of claim 1 , further comprising:
determining a cross correlation coefficient, the cross correlation coefficient based at least in part on an evaluation between a known deviation position from a first data set and an unknown deviation position from the acquired neutron measurement data.

5. The method of claim 1 , wherein the neutron measurement data corresponds to data acquired in a burst gate.

6. The method of claim 1 , wherein the neutron measurement data corresponds to data acquired in a thermal gate.

7. The method of claim 1 , further comprising:
extracting, from the neutron measurement data, one or more data segments, the data segments corresponding to subsets of data associated with the one or more features.

8. A method for determining a deviation from nuclear measurement data, comprising:
receiving a first data set, the first data set including first time domain spectrum measurements with a first set of bins corresponding to respective known deviated positions;
receiving a second data set, the second data set including second time domain spectrum measurements with a second set of bins corresponding to respective unknown deviated positions;
determining, from the first data set, a first response pattern for the respective known deviated positions;
determining, from the second data set, a second response pattern for the respective unknown deviated positions;
determining, based at least in part on the first response pattern and the second response pattern, a cross correlation coefficient between the first response pattern and the second response pattern; and
determining, based at least in part on the cross correlation coefficient, respective deviations for the respective unknown deviated positions.

9. The method of claim 8 , further comprising:
determining, based at least in part on the first response pattern and the second response pattern, a cross correlation coefficient sequence.

10. The method of claim 9 , further comprising:
selecting, from the cross correlation coefficient sequence, a maximum cross correlation coefficient.

11. The method of claim 8 , wherein at least one of the first response pattern or the second response pattern corresponds comprises a plurality of features identifiable by an increased neutron count rate.

12. The method of claim 8 , wherein the second data set is compiled from a plurality of neutron detectors deployed in an array on a downhole tool.

13. The method of claim 8 , wherein the second data set corresponds to data acquired in at least one of a burst gate or a thermal gate.

14. The method of claim 8 , wherein the second data set corresponds to data acquired during a preselected time window.

15. A system for determining a deviation within a wellbore, comprising:
a neutron generator forming at least a first portion of a downhole tool;
a neutron detector forming at least a second portion of a downhole tool;
a control system having a memory and a processor, the processor storing instructions that, when executed by the processor, cause the processor to:
acquire neutron measurement data from a wellbore;
identify one or more features from the neutron measurement data;
determine, based at least in part on a pattern matching algorithm, that the one or more features are indicative of at least one of a tool or a tubular deviation; and
determine, based at least in part on a comparison between the one or more features, a deviation amount.

16. The system of claim 15 , wherein the one or more features are represented by an increased neutron count rate.

17. The system of claim 15 , further comprising:
an array of neutron detectors, the array including the neutron detector, wherein an increased neutron count rate is attributed to at least one detector of the array of neutron detectors, the increased neutron count rate being a threshold quantity greater than a count rate of an adjacent detector of the array of detectors.

18. The system of claim 15 , wherein the instructions, when executed by the processor, cause the processor to:
determine a cross correlation coefficient, the cross correlation coefficient based at least in part on an evaluation between a known deviation position from a first data set and an unknown deviation position from the acquired neutron measurement data.

19. The system of claim 15 , wherein the neutron measurement data corresponds to data acquired in a burst gate.

20. The system of claim 15 , wherein the neutron measurement data corresponds to data acquired in a thermal gate.

Assignees

• Baker Hughes Oilfield Operations Llc

Inventors

• Li Baoyan
• Ramirez Marc
• Yuan Peng

Classifications

• G01V5/045 Primary

  Transmitting data to recording or processing apparatus; Recording data · CPC title

• G01V5/108

  the neutron source being of the pulsed type · CPC title

• G01V5/107 Primary

  and detecting reflected or back-scattered neutrons · CPC title

• G01V5/10 Primary

  using neutron sources {(neutron generating tubes H05H5/00; neutron sources using isotopes G21G4/00)} · CPC title

• G01V5/04

  specially adapted for well-logging · CPC title