Subsurface Containment of Injected Chemicals during In-Situ Bitumen Recovery from Oil Sands,ACS ES&T Engineering

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Subsurface Containment of Injected Chemicals during In-Situ Bitumen Recovery from Oil Sands
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2022-01-14 , DOI: 10.1021/acsestengg.1c00358
Seyed Mostafa Jafari Raad ₁ , Hassan Hassanzadeh ₁

Affiliation

Reservoir containment of the injected fluids is essential in the solvent-aided thermal recovery of bitumen from oil sands from an environmental perspective. Containment is particularly important when new chemicals/solvents, known as Contaminants of Potential Concern (CoPCs), are coinjected with steam to improve the recovery process. In this work, numerical simulations are conducted to study the fate of the injected CoPCs such as propane, butane, hexane, field condensates, ammonia, dimethyl ether, and ethyl acetate. The results reveal that among the CoPCs studied, hexane, field condensates, and ethyl acetate are contained in the oil sands formations, whereas other CoPCs could potentially migrate upward. While upward migration of water-soluble CoPCs such as dimethyl ether and ammonia is limited to the top vicinity of the oil sands formation, propane could migrate upward significantly and reach shallow groundwater resources. Our findings also reveal that injection of solvents/chemicals, such as hexane, field condensates, and ethyl acetate, and to a great extent butane, eliminates migration of the in situ generated gases such as methane. In contrast, other solvents/chemicals such as propane, dimethyl ether, and ammonia allow significant upward migration of methane. These findings improve our understanding of the long-term fate of the injected CoPCs. In addition, the results find applications in the design of cleaner recovery techniques, risk assessment, and the development of regulatory frameworks for improved control on CoPCs.

中文翻译：

油砂原位沥青回收过程中注入化学品的地下密封

从环境的角度来看，注入流体的储层密封对于从油砂中进行沥青的溶剂辅助热采至关重要。当新的化学品/溶剂（称为潜在关注污染物 (CoPC)）与蒸汽同时注入以改善回收过程时，遏制尤为重要。在这项工作中，进行了数值模拟来研究注入的 CoPC 的命运，例如丙烷、丁烷、己烷、现场冷凝物、氨、二甲醚和乙酸乙酯。结果表明，在所研究的CoPCs中，油砂地层中含有己烷、油田凝析油和乙酸乙酯，而其他CoPCs可能会向上迁移。虽然水溶性 CoPCs 如二甲醚和氨的向上迁移仅限于油砂地层的顶部附近，丙烷可以显着向上迁移并到达浅层地下水资源。我们的研究结果还表明，注入溶剂/化学品，如己烷、现场冷凝物和乙酸乙酯，以及在很大程度上丁烷，消除了原位产生的气体如甲烷的迁移。相反，丙烷、二甲醚和氨等其他溶剂/化学品允许甲烷显着向上迁移。这些发现提高了我们对注射 CoPC 长期命运的理解。此外，研究结果还可用于清洁回收技术的设计、风险评估以及制定监管框架以改进对 CoPC 的控制。现场冷凝物、乙酸乙酯和大部分丁烷消除了原位产生的气体如甲烷的迁移。相反，丙烷、二甲醚和氨等其他溶剂/化学品允许甲烷显着向上迁移。这些发现提高了我们对注射 CoPC 长期命运的理解。此外，研究结果还可用于清洁回收技术的设计、风险评估以及制定监管框架以改进对 CoPC 的控制。现场冷凝物、乙酸乙酯和大部分丁烷消除了原位产生的气体如甲烷的迁移。相反，丙烷、二甲醚和氨等其他溶剂/化学品允许甲烷显着向上迁移。这些发现提高了我们对注射 CoPC 长期命运的理解。此外，研究结果还可用于清洁回收技术的设计、风险评估以及制定监管框架以改进对 CoPC 的控制。这些发现提高了我们对注射 CoPC 长期命运的理解。此外，研究结果还可用于清洁回收技术的设计、风险评估以及制定监管框架以改进对 CoPC 的控制。这些发现提高了我们对注射 CoPC 长期命运的理解。此外，研究结果还可用于清洁回收技术的设计、风险评估以及制定监管框架以改进对 CoPC 的控制。

更新日期：2022-01-14

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