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 CO |
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| 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] |
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| Database: | Engineering Source |
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| 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] |
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| ISSN: | 00222348 |
| DOI: | 10.1080/00222348.2025.2484966 |
