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Improving the Microcracks Self-Repairing Capability of Oil Well Cement Stone Under Supercritical CO2 with Hydrophilic Butadiene-Acrylonitrile Polymers.

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Title: Improving the Microcracks Self-Repairing Capability of Oil Well Cement Stone Under Supercritical CO2 with Hydrophilic Butadiene-Acrylonitrile Polymers.
Authors: Zheng, Yong1 (AUTHOR) zheng___yong@126.com, Lou, Yixiang1 (AUTHOR), Liu, Haifeng2 (AUTHOR), Feng, Qian1 (AUTHOR), Peng, Zhigang1 (AUTHOR)
Source: Journal of Macromolecular Science: Physics. 2026, Vol. 65 Issue 7, p1021-1041. 21p.
Subjects: Microcracks, Supercritical carbon dioxide, Oil well cementing, Dispersion (Chemistry), Polymers, Self-healing materials, Acrylonitrile butadiene styrene resins
Abstract: Due to the hydrophobic surface of rubber particles, it is difficult to meet the self-repairing requirements of cemented cement stone microcracks under carbon dioxide oil-drive operating environment. In our research described here hydrophilic modification of butadiene-acrylonitrile polymer particle surfaces using γ-aminopropyl triethoxysilane was conducted. The dispersive ability of the hydrophilic butadiene-polyacrylonitrile polymer particles was assessed using the contact angle test and image binarization, and the dispersion coefficients were calculated for each. A cement stone microcrack self-repairing apparatus was used to determine the microcracks self-repairing capabilities of the cement stone. Dispersion tests revealed that the contact angle of the modified polymer particles in air was 74.3°, which was less than the unmodified ones, 122.3°, and their dispersion coefficient in water was 55.04, which was less than the unmodified particles, 99.11, indicating an 80% improvement in dispersion performance in water. The cement stone outlet flow rate of M-NBR cement stone with just formed cracks was 3800 mL/min, and after being repaired with 8 MPa carbon dioxide at 80 °C for 72 h, the cement stone outlet flow rate decreased to 87 mL/min. After repairing, the width of the cement stone microcrack was significantly reduced compared to the initial 0195 mm, because of the action of filling by swelling of M-NBR particles. Mechanism analysis showed that after the microcracks were created in the supercritical carbon dioxide environment, the modified butadiene-acrylonitrile polymer particles swelled at the microcracks to fill the voids and repair the microcracks in the cement stone. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Macromolecular Science: Physics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Improving the Microcracks Self-Repairing Capability of Oil Well Cement Stone Under Supercritical CO<subscript>2</subscript> with Hydrophilic Butadiene-Acrylonitrile Polymers.
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  Data: <searchLink fieldCode="AR" term="%22Zheng%2C+Yong%22">Zheng, Yong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zheng___yong@126.com</i><br /><searchLink fieldCode="AR" term="%22Lou%2C+Yixiang%22">Lou, Yixiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Haifeng%22">Liu, Haifeng</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Feng%2C+Qian%22">Feng, Qian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peng%2C+Zhigang%22">Peng, Zhigang</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Macromolecular+Science%3A+Physics%22">Journal of Macromolecular Science: Physics</searchLink>. 2026, Vol. 65 Issue 7, p1021-1041. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Microcracks%22">Microcracks</searchLink><br /><searchLink fieldCode="DE" term="%22Supercritical+carbon+dioxide%22">Supercritical carbon dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Oil+well+cementing%22">Oil well cementing</searchLink><br /><searchLink fieldCode="DE" term="%22Dispersion+%28Chemistry%29%22">Dispersion (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Self-healing+materials%22">Self-healing materials</searchLink><br /><searchLink fieldCode="DE" term="%22Acrylonitrile+butadiene+styrene+resins%22">Acrylonitrile butadiene styrene resins</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Due to the hydrophobic surface of rubber particles, it is difficult to meet the self-repairing requirements of cemented cement stone microcracks under carbon dioxide oil-drive operating environment. In our research described here hydrophilic modification of butadiene-acrylonitrile polymer particle surfaces using γ-aminopropyl triethoxysilane was conducted. The dispersive ability of the hydrophilic butadiene-polyacrylonitrile polymer particles was assessed using the contact angle test and image binarization, and the dispersion coefficients were calculated for each. A cement stone microcrack self-repairing apparatus was used to determine the microcracks self-repairing capabilities of the cement stone. Dispersion tests revealed that the contact angle of the modified polymer particles in air was 74.3°, which was less than the unmodified ones, 122.3°, and their dispersion coefficient in water was 55.04, which was less than the unmodified particles, 99.11, indicating an 80% improvement in dispersion performance in water. The cement stone outlet flow rate of M-NBR cement stone with just formed cracks was 3800 mL/min, and after being repaired with 8 MPa carbon dioxide at 80 °C for 72 h, the cement stone outlet flow rate decreased to 87 mL/min. After repairing, the width of the cement stone microcrack was significantly reduced compared to the initial 0195 mm, because of the action of filling by swelling of M-NBR particles. Mechanism analysis showed that after the microcracks were created in the supercritical carbon dioxide environment, the modified butadiene-acrylonitrile polymer particles swelled at the microcracks to fill the voids and repair the microcracks in the cement stone. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Macromolecular Science: Physics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1080/00222348.2025.2484966
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 21
        StartPage: 1021
    Subjects:
      – SubjectFull: Microcracks
        Type: general
      – SubjectFull: Supercritical carbon dioxide
        Type: general
      – SubjectFull: Oil well cementing
        Type: general
      – SubjectFull: Dispersion (Chemistry)
        Type: general
      – SubjectFull: Polymers
        Type: general
      – SubjectFull: Self-healing materials
        Type: general
      – SubjectFull: Acrylonitrile butadiene styrene resins
        Type: general
    Titles:
      – TitleFull: Improving the Microcracks Self-Repairing Capability of Oil Well Cement Stone Under Supercritical CO2 with Hydrophilic Butadiene-Acrylonitrile Polymers.
        Type: main
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            NameFull: Zheng, Yong
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            NameFull: Lou, Yixiang
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            NameFull: Liu, Haifeng
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            NameFull: Feng, Qian
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            – D: 01
              M: 07
              Text: 2026
              Type: published
              Y: 2026
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