Cement having stress-indicating properties
AssigneeUT-Battelle, LLC
InventorsYarom Polsky, Michael J. Lance, Catherine H. Mattus, James G. Hemrick
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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.
Claims18
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.
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.
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.
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.
Dependencies are inferred from the claim text.