Development and performance evaluation of epoxy resin system for repairing agent

Shi, Liu; Liu, Wenming; Qi, Ben; Zhao, Lin; Li, Pengpeng; Wu, Chaoming; Zhang, Qingchang; Hu, Miaomiao; Guo, Jintang

doi:10.1002/app.52260

Cited by 2 publications

(3 citation statements)

References 31 publications

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“…(4) The blockage material was hard to remove after the construction troubles of pipe stuck while injecting cement. ,− A considerable amount of literature on the application of epoxy resins is available, such as repairing damaged cement sheaths and casing damaged wells, treating sand production problems, and plugging highly permeable passages. However, there are a variety of challenges associated with the application of resins to repairing well operation, such as alternating loads from both the sustained casing pressure and corrosion of the resin by chemicals could have an impact on the long-term stability of the resin. − …”

Section: Introductionmentioning

confidence: 99%

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Preparation of Low-Viscosity Epoxy Resin Sealing Agent and Evaluation of Injection, Plugging, and Degradation Properties

Chen,

Li,

Peng

et al. 2024

ACS Omega

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The technology of water plugging and increasing production in high water cut reservoirs of low permeability is a common problem in the industry. Epoxy resin, displaying excellent mechanical properties and adherent performance, can easily inject a tiny crack, forming a long-term blocking barrier. This study aimed to investigate an easily injectable degradable epoxy resin sealing material. The injectable performance, longterm stability, and mechanical and plugging properties were comparatively analyzed in the fractured core, and the degradable performance was discussed in the degrading solution. The result showed that the range of R (R is the ratio of EOG and MHHPA) from 1 to 1.1 and the mass fraction range of EMI from 0.01 to 4 wt % are the optimal formulations (EOGM). The curing time from 1 to 12 h could be regulated by adjusting the dosage of EMI, as well as the strength being more than 60 MPa. The plugging agent's initial viscosity is lower than 100 MPa s at 20 °C and injecting pressure is lower than 0.1 MPa. After curing for 24 h, compressive strength was more than 72.76 MPa, 3.6 times higher than that of cement, and the adhesion strength was 4.41 MPa when the contact area was 75.93 cm 3 . Breakthrough pressures for sealing 1−5 mm fractures were all more than 10 MPa, and the breakthrough pressure for 1 mm crack even reached 29.4 MPa. Epoxy resin/acid anhydride system could be degraded in a mixed solution of phenol−potassium salt−heavy aromatics within 7 days at 60−100 °C, which reduced the plugging well risk of the epoxy resin plugging agent. These results suggest that an epoxy resin/acid anhydride plugging agent can be employed effectively and safely for the injection of tiny cracks, which is of great engineering significance.

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Section: Introductionmentioning

confidence: 99%

“…However, there are a variety of challenges associated with the application of resins to repairing well operation, such as alternating loads from both the sustained casing pressure and corrosion of the resin by chemicals could have an impact on the long-term stability of the resin. 20 − 23 …”

Section: Introductionmentioning

confidence: 99%

Preparation of Low-Viscosity Epoxy Resin Sealing Agent and Evaluation of Injection, Plugging, and Degradation Properties

Chen,

Li,

Peng

et al. 2024

ACS Omega

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“…But few studies focused on the curing process at high temperatures, which not only impedes the deep understanding of epoxy resin formation, but also limits their applications in a wider range of conditions. For example, some applications that are emerging recently have opposite requirements, i.e., slow curing at extremely high temperature underwater. , When epoxy resin is used as plugging material for water shut-off in oil and gas exploration, a slow curing at high temperatures underwater is needed to ensure the curing occurs at the target position underground but not in the wellbore during injecting. − In this case, a mixture of prepolymer and curing agent is injected underground through the wellbore via a liquid transportation method for several hours and then solidifies to block the water layer, where the formation temperature is normally >120 °C. High temperature certainly accelerates the curing process; thus, it is a big challenge to realize the slow curing of epoxy resin in hot water.…”

Section: Introductionmentioning

confidence: 99%

Slow Curing of Epoxy Resin Underwater at High Temperatures

Zhu

Yin

et al. 2022

Ind. Eng. Chem. Res.

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Epoxy resins have been widely applied in various industrial fields, because of their high performances. However, previous studies mainly focused on low and medium temperatures; thus, curing behavior at high temperatures was less documented, which largely limits the deep understanding of epoxy resin formation and their applications in wider conditions. In this work, a novel curing agent, 4,4′-((methylenebis(4,1-phenylene))bis(azanediyl))bis(4-(furan-2-yl)butan-2-one) (AFPA), has been designed and synthesized via a one-pot method. The gelation time of epoxy system with AFPA underwater at 120 and 150 °C reaches 20 and 8 h, respectively. The activation energy of the system is calculated to be as high as 33.88 kJ mol–1, which accounts for the very long gelation time. Differential scanning calorimetry and thermogravimetric analysis results have shown that the glass-transition temperature of the epoxy resin is 123 °C, and the 5 wt % mass-loss temperature is 233 °C. Mechanical property tests have shown that the cured epoxy resin has good compressive strength, reaching 122 MPa at 30 °C and 41 MPa, even at 120 °C. A plugging experiment is designed and performed, and the results reveal that such epoxy system can easily pass through simulated formation rock fractures and cure in the presence of water at 120 °C to plug the fractures. We believe the findings in this work could provide an alternative way to develop systems with long curing times. Given the very long gelation time at high temperatures underwater and the good mechanical properties, such epoxy resin may find applications in water shut-off in the upstream of oil and gas industry, where water management underground is highly desired.

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Development and performance evaluation of epoxy resin system for repairing agent

Cited by 2 publications

References 31 publications

Preparation of Low-Viscosity Epoxy Resin Sealing Agent and Evaluation of Injection, Plugging, and Degradation Properties

Preparation of Low-Viscosity Epoxy Resin Sealing Agent and Evaluation of Injection, Plugging, and Degradation Properties

Slow Curing of Epoxy Resin Underwater at High Temperatures

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