Optimization and evaluation of low-temperature curable methyl methacrylate resin wellbore repair system

doi:10.3969/j.issn.1006-6535.2025.05.020

Abstract

Abstract: During CO₂ flooding and storage, influenced by mechanical factors, wellbore integrity may be compromised, leading to gas channeling and leakage. In response to this problem, a low-temperature (30-45 ℃) curable methyl methacrylate (MMA) resin wellbore repair system was developed using methyl methacrylate as the main agent, with the addition of redox initiators and cross-linking agents. Performance evaluation of the system was subsequently conducted. The study shows that at 40 ℃, the initial setting time of this resin repair system is 8.2 hours, and the curing time is 10.4 hours; the repair system has good injection performance and adhesion performance, with a surface tension of 27.1 mN/m, and contact angles with sandstone, N80 steel sheet, and oil well cement are all less than 30°. The bonding strength at the cement-steel pipe interface is increased by 13.15 times compared to before repair. The repair system has good CO₂ channeling sealing performance and CO₂ aging resistance. After repairing the cement-steel pipe interface, the CO₂ breakthrough pressure is 26.78 MPa; under CO₂ aging conditions, the compressive strength and CO₂ permeability of the quartz sand consolidated body change by less than 5.0% within 30 days; this resin repair system can enter micro-pores with sizes of 20-100 μm and tightly fill them after curing. This wellbore repair system has important application value for CO₂ flooding and storage in low-temperature reservoirs.

Key words: CO₂ flooding and storage, wellbore integrity, wellbore repair, methyl methacrylate, resin

CLC Number:

TE39

BI Weiyu, HE Zhiwu, WANG Zhiyong, ZHOU Pei, WANG Xiaoyong, LIU Xiaochun. Optimization and evaluation of low-temperature curable methyl methacrylate resin wellbore repair system[J]. Special Oil & Gas Reservoirs, 2024, 32(5): 167-174.

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