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Alkali-Resistant and pH-Sensitive Water Absorbent Self-Healing Materials Suitable for Oil Well Cement

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  • Lin Zhao

    (College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
    Petroleum Engineering Technology Research Institute, SINOPEC Henan Oilfield Branch Company, Nanyang 473132, China)

  • Ning Li

    (College of Materials Science & Engineering, Nanjing Tech University, Nanjing 211816, China)

  • Junhu Yang

    (Petroleum Engineering Technology Research Institute, SINOPEC Henan Oilfield Branch Company, Nanyang 473132, China)

  • Haijuan Wang

    (Petroleum Engineering Technology Research Institute, SINOPEC Henan Oilfield Branch Company, Nanyang 473132, China)

  • Lihui Zheng

    (College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China)

  • Chunyu Wang

    (College of Materials Science & Engineering, Nanjing Tech University, Nanjing 211816, China)

Abstract

Oil well cement microcracks cause formation fluid channeling, compromising oil and gas extraction safety. Superabsorbent polymer (SAP) can absorb water and swell to prevent fluid channeling. In this study, an alkali-resistant and pH-sensitive SAP was prepared based on the properties of oil well cement slurry. The preparation of the SAP was optimized, including monomer ratio, cross-linking agent dosage, and monomer concentration. The pH sensitivity and alkali resistance of the SAP were evaluated. The results revealed that the SAP exhibited good pH sensitivity, with the absorption rate in water being 2.18 times that of cement slurry filtrate (CSF) at 95 °C. Furthermore, the FTIR spectrum showed that the SAP had a stable molecular structure. The secondary absorption rate in water of the SAP after soaking in CSF was not different from the original absorption rate. Styrene–butadiene latex (SBL) can be used to adjust the SAP’s absorption rate. The SAP’s absorption rate had a good exponential functional relationship with SBL dosage. The SBL dosage can be determined by the functional relationships to prepare a SAP with the required properties.

Suggested Citation

  • Lin Zhao & Ning Li & Junhu Yang & Haijuan Wang & Lihui Zheng & Chunyu Wang, 2022. "Alkali-Resistant and pH-Sensitive Water Absorbent Self-Healing Materials Suitable for Oil Well Cement," Energies, MDPI, vol. 15(20), pages 1-11, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7630-:d:943499
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    References listed on IDEAS

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    1. Lixia Li & Tianle Liu & Guosheng Jiang & Changliang Fang & Jiaxin Sun & Shaojun Zheng & Haodong Liu & Ekaterina Leusheva & Valentin Morenov & Nikolai Nikolaev, 2021. "Field Application of Microbial Self-Healing Cement Slurry in Chunguang 17-14 Well," Energies, MDPI, vol. 14(6), pages 1-19, March.
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    Cited by:

    1. Ben Qi & Jiawen Fu & Jinfei Sun & Zaoyuan Li & Xin Yang & Fujie Yang & Xuning Wu, 2023. "Numerical Simulation on the Safety and Quality of Cementing by Using Pad Fluid in Horizontal Wells," Energies, MDPI, vol. 16(9), pages 1-15, April.

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