Epoxy Resin Exhibits Long-Term Durability and Chemical Stability as a Well Sealant

F. Sabins, A. Apblett, R. Shafer, L. Watters
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Abstract

The necessity to verify epoxy resin sealant's reliability for well applications is amplified as its use increases. Limited data exists to confirm resin's long-term durability or chemical stability under exposure to well fluids at temperature and pressure. This paper presents laboratory results illustrating durability and stability of epoxy resin exposed to a range of well fluids over a span of temperatures. Additionally, results of accelerated thermal degradation testing further quantify long-term thermal and chemical stability. Epoxy resins formulated for a range of remedial and abandonment applications were cured in fresh water, CaCl2 brine, and hydrocarbon at 170°F up to one year. Additional samples cured in fresh water and water containing CO2 and H2S at elevated temperatures (220°F to 320°F) for up to six weeks to produce accelerated degradation reactions allowed the assessment of resin degradation verses temperature. Thermal Gravimetric Analysis (TGA) evaluated chemical and mechanical degradation verses time at temperatures ranging from 200°C to 400°C. Arrhenius calculations were performed to forecast long term stability of resins across their intended temperature ranges. Resulting data were analyzed to develop an inclusive assessment of resin stability and durability in well environments. Results indicate properly formulated epoxy resin is a mechanically, chemically, and thermally durable sealant for well applications.
环氧树脂作为井密封剂具有长期耐久性和化学稳定性
随着环氧树脂密封胶使用量的增加,验证其可靠性的必要性也越来越大。目前的数据有限,无法证实树脂在温度和压力下的长期耐久性或化学稳定性。本文介绍了实验室结果,说明了环氧树脂在一定温度范围内暴露于一系列井液中的耐久性和稳定性。此外,加速热降解测试的结果进一步量化了长期热稳定性和化学稳定性。为一系列补救和废弃应用而配制的环氧树脂在170°F的淡水、CaCl2盐水和碳氢化合物中固化长达一年。额外的样品在淡水和含有CO2和H2S的水中在高温下(220°F至320°F)固化长达6周,以产生加速降解反应,从而评估树脂降解随温度的变化。热重分析(TGA)在200°C至400°C的温度范围内评估了化学和机械降解随时间的变化。进行阿伦尼乌斯计算来预测树脂在其预期温度范围内的长期稳定性。分析所得数据,对树脂在井环境中的稳定性和耐久性进行全面评估。结果表明,配方合理的环氧树脂是一种机械、化学和热耐用的井用密封胶。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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