为模拟海域真实环境,在三轴应力、氯化钠体系以及水合物储层富水状态的条件下,开展针对氯化钠体系、储层初始饱和度以及置换压应力对液态CO2置换开采海域天然气水合物的实验。研究表明：在三轴应力以及孔隙度约46.70%的条件下,氯化钠体系对CH4置换效率影响较小,但对CO2水合物合成表现出抑制作用;储层初始饱和度与CH4置换效率之间是负相关关系且高的储层含水率更有利于CO2封存;CH4置换效率随着置换压应力的增长有一定幅度的提高,置换压应力的增大为CO2水合物合成提供了高的驱动力,进而提高了CO2封存效率。
Abstract
In order to simulate the real environment in the sea area, these experiments were carried out to study the effects of sodium chloride, initial saturation of the reservoir and replacement compressive stress on the liquid CO2 replacement-exploitation of natural gas hydrate in the sea area under the rich water condition. This study shows that under the condition of triaxial stress and porosity about 46.70%, the sodium chloride system has little effect on the CH4 replacement efficiency, but it inhibits the CO2 hydrate synthesis. There is a negative correlation between initial reservoir saturation and CH4 replacement efficiency. In addition, a high reservoir water content is more favorable for CO2 storage. The CH4 replacement efficiency increases with the increasing replacement compressive stress, the increase of replacement compressive stress provides a high driving force for the CO2 hydrate formation, thereby improving the CO2 sequestration efficiency.
关键词
天然气水合物 /
二氧化碳 /
甲烷 /
氯化钠 /
置换 /
三轴应力 /
储层初始饱和度
Key words
natural gas hydrate /
carbon dioxide /
methane /
sodium chloride /
replacement /
triaxial stress /
initial reservoir saturation
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基金
科技部地球深部钻探与深地资源开发国际联合研究中心（DEDRD-2022-05）; 博士后面上71批基金（2022M712337）; 山西省回国留学人员科研资助项目（2020-046）; 山西省科技创新人才团队项目
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