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

Lin Zhao, Ning Li, Junhu Yang, Haijuan Wang, Lihui Zheng () and Chunyu Wang ()
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Lin Zhao: College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, 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

Energies, 2022, vol. 15, issue 20, 1-11

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.

Keywords: self-healing cement; alkali resistance; pH sensitivity; superabsorbent polymer; oil well cement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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