页岩中CO2的透模型考虑了动态滑动,有效应力和气体吸附
WenBo Zhai1, Di Wu2,3, XueYing Liu1
1School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China.
Scientific reports
|December 27, 2024
概括
页岩透性在二氧化碳 (CO2) 注入过程中随着孔隙压力而变化非指数,显示出最初的下降,然后增加. 页岩变形也随二氧化碳压力而变化,影响透性模型.
科学领域:
- 地质科学 地质科学
- 石油工程是石油工程中的一个.
- 材料科学 材料科学 材料科学
背景情况:
- 了解页岩透性对于碳捕获,利用和储存 (CCUS) 以及增强石油回收 (EOR) 至关重要.
- 二氧化碳 (CO2) 的注入会改变页岩的特性,影响流体流动和岩石完整性.
- 现有的模型可能无法完全捕捉到二氧化碳,孔隙压力和页岩行为之间的复杂相互作用.
研究的目的:
- 为了研究二氧化碳注入下页岩透性的演变.
- 为了分析页岩变形,以应对二氧化碳吸附和压力变化.
- 为CO2页岩相互作用开发一个更准确的透性模型.
主要方法:
- 改进的单容器压力脉冲减弱方法用于二氧化碳透实验.
- 在受控温度和气体压力下进行二氧化碳吸附变形试验.
- 通过整合吸附膨胀,有效应力,真实气体效应和动态滑动因子来纠正滑动效应.
主要成果:
- 页岩透性的演变与孔隙压力表现出非指数式的模式,下降然后增加,在CO2相变之前和之后有不同的阶段.
- 在二氧化碳压力的增加下,页岩变形显示出最初的增加,随后的减少,以压缩,缓慢膨胀和稳定的阶段为特征.
- 修改后的透性模型与实验数据的一致性得到了改善.
结论:
- 页岩的透性受到二氧化碳相位变化和孔隙压力的显著影响.
- 二氧化碳吸附和相关的变形在改变页岩透性方面发挥着关键作用.
- 结合多个因素的综合模型可以更准确地表示CO2页岩流动的动态.
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