Systems and methods for determining well casing eccentricity

Patent metadata

Field	Value
Publication number	US-11879323-B2
Application number	US-202017080761-A
Country	US
Kind code	B2
Filing date	Oct 26, 2020
Priority date	Oct 25, 2019
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

Implementations described and claimed herein provide systems and methods for isolation detection. In one implementation, a radial acoustic log is obtained. The radial acoustic log is captured using a radial sensor of an acoustic logging tool deployed within a first structure. The first structure disposed within a second structure in a subterranean environment. A radial symmetry is determined using the radial acoustic log. An eccentricity of the first structure relative to the second structure is determined based on the radial symmetry.

First claim

What is claimed is:

1. A method for analyzing a subterranean structure configuration, the method comprising:
obtaining a radial acoustic log at a computing system having one or more processors, the radial acoustic log captured using a radial sensor of an acoustic logging tool deployed within a first structure, the first structure disposed within a second structure in a subterranean environment;
determining, with the one or more processors of the computing system, a radial symmetry using the radial acoustic log; and
determining, with the one or more processors of the computing system, an eccentricity of the first structure relative to the second structure based on the radial symmetry.

2. The method of claim 1 , wherein radial sensor rotates within the first structure.

3. The method of claim 1 , wherein the first structure is a production tube and the second structure is a casing, the production tube and the casing deployed in a wellbore.

4. The method of claim 1 , wherein the eccentricity includes the first structure being concentric relative to the second structure when the radial symmetry includes a zero radial symmetry output.

5. The method of claim 1 , wherein the radial sensor includes a set of receivers disposed equidistant from a transmitter along a circumferential direction.

6. The method of claim 5 , wherein the radial symmetry is determined using differential sensing between the set of receivers.

7. The method of claim 1 , wherein the acoustic logging tool includes an axial sensor configured to capture an axial log.

8. The method of claim 7 , wherein an obliqueness between the first structure and the second structure is determined using at least one of the radial acoustic log or the axial log.

9. The method of claim 1 , wherein a convolution technique is used to identify axes of symmetry within the radial acoustic log.

10. The method of claim 9 , wherein the axes of symmetry correspond to the eccentricity.

11. One or more tangible non-transitory computer-readable storage media storing computer-executable instructions for performing a computer process on a computing system, the computer process comprising:
obtaining a radial acoustic log, the radial acoustic log captured using a radial sensor of an acoustic logging tool deployed within a first structure, the first structure disposed within a second structure in a subterranean environment;
determining a radial symmetry using the radial acoustic log; and
determining an eccentricity of the first structure relative to the second structure based on the radial symmetry.

12. The one or more tangible non-transitory computer-readable storage media of claim 11 , wherein radial sensor rotates within the first structure.

13. The one or more tangible non-transitory computer-readable storage media of claim 11 , wherein the first structure is a production tube and the second structure is a casing, the production tube and the casing deployed in a wellbore.

14. The one or more tangible non-transitory computer-readable storage media of claim 11 , wherein the eccentricity includes the first structure being concentric relative to the second structure when the radial symmetry includes a zero radial symmetry output.

15. The one or more tangible non-transitory computer-readable storage media of claim 11 , wherein the acoustic logging tool includes an axial sensor configured to capture an axial log.

16. The one or more tangible non-transitory computer-readable storage media of claim 15 , wherein an obliqueness between the first structure and the second structure is determined using at least one of the radial acoustic log or the axial log.

17. The one or more tangible non-transitory computer-readable storage media of claim 11 , wherein a convolution technique is used to identify axes of symmetry within the radial acoustic log.

18. The one or more tangible non-transitory computer-readable storage media of claim 17 , wherein the axes of symmetry correspond to the eccentricity.

Assignees

• Pipelines 2 Data P2D Ltd
• Conocophillips Co

Inventors

• Steel Geoff
• Walsh Mark
• Mayo Stephen John

Classifications

• E21B47/005 Primary

  Monitoring or checking of cementation quality or level · CPC title

• E21B47/085

  using radiant means, e.g. acoustic, radioactive or electromagnetic · CPC title

• E21B47/095

  by detecting an acoustic anomalies, e.g. using mud-pressure pulses · CPC title

• G01V1/284

  Application of the shear wave component and/or several components of the seismic signal · CPC title

• G01V1/306

  for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles · CPC title