【作者】 李子涵； 陈晨； 潘栋彬； 钟秀平； 聂帅帅； 孟奕龙；

【Author】 LI Zihan;CHEN Chen;PAN Dongbin;ZHONG Xiuping;NIE Shuaishuai;MENG Yilong;College of Construction Engineering,Jilin University;Key Laboratory of Drilling and Exploitation Technology in Complex Conditions of Ministry of Natural Resources;

【机构】 吉林大学建设工程学院； 自然资源部复杂条件钻采技术重点实验室；

【摘要】 本文对目前开采天然气水合物的5种方法进行了归纳总结,重点分析了CO₂置换开采以及固体开采法,并通过分析这2种开采方法的优劣势,提出了水射流冲蚀、破碎海洋天然气水合物储层联合CO₂置换开采天然气水合物的新思路。水射流冲蚀、破坏水合物储层后形成的采空区能为CO₂提供更好的储藏空间并提高其与储层的作用面积,提高置换效率;封存的CO₂水合物也可以提高水合物储层的稳定性,具有良好的互补效应。实验结果表明,在整个置换过程中,含采空区储层CH₄置换率为24.3%,CO₂封存率为22.1%;完整储层CH₄置换率为15.3%,CO₂封存率为20.9%,置换率提升约59%,封存率提升约5.7%。采空区的作用主要体现在提升水合物置换介质的注入量上。更多还原

【Abstract】 The five current methods of mining natural gas hydrates are summarized with focus on the analysis of CO₂ replacement mining and solid mining methods,and by analyzing the advantages and disadvantages of the two mining methods,a new approach,by which water jets erodes and breaks ocean gas hydrates in combination with CO₂ replacement,is proposed for the exploitation of natural gas hydrates,The mined-out area formed by erosion and breaking of water jets in the hydrate reservoir can provide better storage space for CO₂,increase its interaction area with the reservoir,and improve the replacement efficiency.The stored CO₂ hydrate can also increase the stability of the hydrate reservoir,providing good complementary effect.The experimental results show that during the entire replacement process,the CH₄ replacement rate in the reservoir containing the mined-out area is 24.3%,and the CO₂ storage rate is 22.1%;while the CH₄ replacement rate in the intact reservoir is 15.3%,and the CO₂ storage rate is20.9%;indicating that the replacement rate increases about 59%,the storage rate increases about 5.7%.The function of the goaf is mainly reflected in increasing the injection volume of the hydrate replacement medium.更多还原