在粘土抑制剂/油系统中的二氧化碳溶解-扩散和在对水非常敏感的水库中的协同作用的CCUS-EOR效应
Miaoxin Zhang1, Jingchun Wu2, Liyuan Cai1
1Key Laboratory for EOR Technology (Ministry of Education), Northeast Petroleum University, Daqing, 163318, China.
Scientific reports
|July 27, 2025
概括
与二氧化碳注射相结合的抗膨胀系统有效地减轻了水敏感水库中的粘土膨胀. 这种双重方法增强了石油回收,并实现了显著的碳捕获,提供了低碳发展战略.
科学领域:
- 石油工程是石油工程中的一个.
- 地质化学 地质化学
- 碳捕获,利用和储存 (CCUS) 是一个
背景情况:
- 具有高粘土含量,对水敏感的水库会因为水淹时粘土膨胀而经历孔狭窄.
- 这种膨胀现象会对石油回收和油库完整性产生负面影响.
- 碳捕获,利用和储存增强的石油回收 (CCUS-EOR) 提供了一个潜在的解决方案,但需要了解二氧化碳与储备液体和矿物质的相互作用.
研究的目的:
- 调查抗胀系统和二氧化碳注射在缓解粘土胀和增强石油回收方面的协同效应.
- 分析二氧化碳在原油和抗膨胀系统的存在下溶解,扩散和封存的行为.
- 开发和验证CCUS-EOR场景中多相流和相互作用的改进数学模型.
主要方法:
- 压力衰变方法研究二氧化碳扩散.
- 核心洪水实验模拟水库条件并评估油位移.
- 显微镜可视化油位移的情况.
- 开发了一种增强的数学模型,其中包括油水相分割系数和PR-EOS状态方程.
主要成果:
- 发现粘土矿物质阻碍了超临界二氧化碳扩散,扩散系数在更高的压力下平衡.
- 反膨胀系统通过抑制粘土膨胀,增加了有效的孔隙连接,导致二氧化碳扩散系数增加了20-28%.
- 增强的数学模型准确地描述了多相相互作用,与实验数据相匹配92%.
- 反膨胀系统-CO2泛滥在核心样本中实现了73.95%的扫除效率,58.12%的石油回收率和46.16%的CO2封存效率.
结论:
- 结合的抗膨胀系统和二氧化碳注射技术展示了稳定孔隙结构,降低油脂粘度,并实现高效的二氧化碳封存的协同机制.
- 这种方法在高度敏感的油田中为石油回收和碳封存提供了显著的好处.
- 该研究为这些具有挑战性的水库的低碳开发提供了宝贵的理论和实践指导.
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