Cement having stress-indicating properties

Patent metadata

Field	Value
Publication number	US-10620065-B2
Application number	US-201715807950-A
Country	US
Kind code	B2
Filing date	Nov 9, 2017
Priority date	Dec 1, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A system and method measures subterranean stress. The system and method includes a cement mixture that is mixed with water to set as a solid and a stress measuring-medium having piezospectroscopic properties that directly reveals stress in situ within the cement mixture in response to a photo stimulation. The stress measuring-medium combines with the cement mixture as a dry blend before being combined with water.

First claim

What is claimed is:

1. A stress sensor system that measures subterranean stress in situ comprising:
a cement mixture that is mixed with water to set as a solid material; and
a stress measuring-medium having piezospectroscopic properties that directly reveals stress in situ within the cement mixture in response to a photo stimulation by measuring an absorption of an incident light non-radiatively de-excited to about 14400 cm −1 ;
where the stress measuring-medium is combined with the cement mixture and water.

2. The system of claim 1 further comprising an expansive mineral additive combined with the stress measuring-medium.

3. The system of claim 2 further comprising a water-reducing admixture combined with the stress measuring-medium.

4. The system of claim 1 where the stress measuring-medium comprises an alpha-alumina material.

5. The system of claim 1 where the stress measuring-medium comprises an alpha-alumina material and a chromia material.

6. The system of claim 1 where the cement mixture comprises a Portland cement that forms a hydraulic seal with an alpha-alumina material.

7. The system of claim 1 where the cement mixture comprises a calcium sulfoaluminate cement added to a class H cement that forms a hydraulic seal with a alpha-alumina material.

8. A stress sensor that measures subterranean stress in situ comprising:
a cement mixture that is mixed with water to set as a solid material; and
a stress measuring-medium having piezospectroscopic properties that directly reveals stress in situ within the cement mixture in response to a photo stimulation;
where the stress measuring-medium is combined with the cement mixture and water; and
where the stress sensor renders a spectral resolution of 0.01 cm −1 at about 1443 cm −1 .

9. A method for measuring subterranean stress in situ comprising:
mixing a water reducing admixture with water to render a mixture;
dry blending a cement mixture, an expansive mineral additive, and a stress measuring-medium in a dry blend; and
mixing progressively the dry blend to obtain a homogeneous cement slurry; and
where the stress measuring medium comprises about a fifty-five percent dry blend by weight of a total weight of the cement mixture;
where the stress measuring medium renders a spectral resolution of about 0.01 cm −1 at about 1443 cm −1 .

10. The method of claim 9 where the stress measuring-medium comprises an alpha-alumina material.

11. The method of claim 9 where the stress measuring-medium comprises an alpha-alumina material and a chromia material.

12. The method of claim 9 where the cement mixture comprises a Portland cement that forms a hydraulic seal with an alpha-alumina material.

13. The method of claim 9 where the cement mixture comprises a calcium sulfoaluminate cement added to a class H cement that forms a hydraulic seal with an alpha-alumina material.

14. The method of claim 9 where the stress measuring medium comprises a processed alumina heated up and until 950° C.

15. A stress sensor system that measures subterranean stress in situ comprising:
a cement mixture that is mixed with water to set as a solid material; and
an alpha-alumina compound having piezospectroscopic properties that directly reveals stress in situ within the cement mixture in response to a photo stimulation;
where the alpha-alumina compound is combined with the cement mixture; and
where the stress sensor renders a spectral resolution between 0.0095 cm −1 and 0.01 cm −1 at between 14400 cm −1 and 1443 cm −1 .

16. The system of claim 15 further comprising an expansive mineral additive combined with the alpha-alumina compound.

17. The system of claim 16 further comprising a water-reducing admixture combined with the alpha-alumina compound.

18. The system of claim 15 where the alpha-alumina compound comprises an alpha-alumina material and a chromia material.

Assignees

• Ut Battelle Llc

Inventors

• Polsky Yarom
• Lance Michael J
• Mattus Catherine H
• Hemrick James G

Classifications

• E21B47/005

  Monitoring or checking of cementation quality or level · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• G01L1/26

  Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload · CPC title

• C04B7/02

  Portland cement · CPC title

• C04B2111/80

  Optical properties, e.g. transparency or reflexibility · CPC title