使用可溶性聚合物制成的CO2喷雾剂来改善超临界CO2的替换在低透性破裂水库中
Mingxi Liu1, Kaoping Song1, Longxin Wang1
1Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, China.
Polymers
|August 10, 2024
概括
可溶于二氧化碳 (CO2) 的泡剂有效地改善了低透性破裂水库中的石油回收. 这些剂可增强密封性,并将提取量增加12%以上,解决二氧化碳注入方面的挑战,以提高石油回收率.
科学领域:
- 石油工程是石油工程中的一个.
- 储水库工程 储水库工程
- 增强的石油回收 (EOR)
背景情况:
- 低透度 (<10 mD) 的水库在水淹时会面临注入挑战,例如高压下降和较差的孔隙动员.
- 这些水库中的微小断裂加快了注入气体 (如二氧化碳) 的流量,导致利用率低,回收率降低.
- 在EOR中使用二氧化碳注入,以减轻注入困难并减少碳排放.
研究的目的:
- 调查二氧化碳可溶性泡系统的有效性,以提高低透性破裂水库中的石油回收.
- 评估两种可溶于二氧化碳的吹剂 (CG-1和CG-2) 在不同条件下的性能.
- 优化注入参数,以改善破裂核心的密封和油脂回收.
主要方法:
- 对于CG-1和CG-2进行了静态泡性能测试,不同的CO2相状态,水含量和油含量.
- 根据泡结果选择了首选的吹剂,用于随后的断裂核心移位实验.
- 破裂核心实验评估了不同注入速率和度的密封效率和油回收改进.
主要成果:
- 即使在低水量和不同油含量的情况下,CG-1也表现出强大的泡性能,使其适合破裂储应用.
- 使用所选吹剂的优化注射条件 (0.6毫升/分钟速率,2.80%度) 实现了83.7%的阻塞率.
- 优化的泡系统使得石油提取度大幅提高了12.02%.
结论:
- 可溶于二氧化碳的泡剂,特别是CG-1,可以有效地改善低透性破裂水库中的石油回收.
- 开发的泡系统显示了提高扫效率和减轻气体流通的巨大潜力.
- 这项研究为二氧化碳可溶性吹剂在破裂水库开发中的实际应用提供了有价值的数据.
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