Enhanced gas production and CO2 storage in hydrate-bearing sediments via pre-depressurization and rapid CO2 injection

扫码查看

原文链接

万方数据

外文摘要：Carbon emission reduction and clean energy development are urgent demands for mankind in the coming decades.Exploring an efficient CO2 storage method can significantly reduce CO2 emissions in the short term.In this study,we attempted to construct sediment samples with different residual CH4 hy-drate amounts and reservoir conditions,and then investigate the potentials of both CO2 storage and enhanced CH4 recovery in depleted gas hydrate deposits in the permafrost and ocean zones,respectively.The results demonstrate that CO2 hydrate formation rate can be significantly improved due to the presence of residual hydrate seeds;However,excessive residual hydrates in turn lead to the decrease in CO2 storage efficiency.Affected by the T-P conditions of the reservoir,the storage amount of liquid CO2 can reach 8 times that of gaseous CO2,and CO2 stored in hydrate form reaches 2-4 times.Additionally,we noticed two other advantages of this method.One is that CO2 injection can enhance CH4 recovery rate and increases CH4 recovery by 10％-20％.The second is that hydrate saturation in the reservoir can be restored to 20％-40％,which means that the solid volume of the reservoir avoids serious shrinkage.Obviously,this is crucial for protecting the goaf stability.In summary,this approach is greatly promising for high-efficient CO2 storage and safe exploitation of gas hydrate.

外文关键词：

HydrateDepressurizationCO2 storageCH4 productionReservoir remediation

作者：

Hongnan Chen、Yifei Sun、Bojian Cao、Minglong Wang、Ming Wang、Jinrong Zhong、Changyu Sun、Guangjin Chen

展开 >

作者单位：

State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China

School of Chemistry and Chemical Engineering,Changsha University of Science & Technology,Changsha 410114,China

基金：

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Science Foundation of China University of Petroleum BeijingHunan Provincial Department of Education Scientific Research Project

项目编号：

223784245200413622127812U20B60052462023BJRC01722B0310

出版年：

2024

DOI：

10.1016/j.cjche.2023.09.016

中国化学工程学报(英文版)

中国化工学会

中国化学工程学报(英文版)

CSTPCDEI

影响因子：0.818

ISSN：1004-9541

年,卷(期)：2024.67(3)

参考文献量38