摘要
利用CO_(2)开采页岩气不仅能够提高页岩气采收率,还能够节省水资源并且对CO_(2)进行地质封存,有助于实现页岩气开采过程的碳中和.富有机质页岩储层纳微米孔隙中气体运移机制不同于常规储层,CO_(2)在储层中具有超临界特性,致使开采机理复杂,无法得到CO_(2)开采页岩气微观机理的准确认识,所以研究CH_(4),CO_(2)及其二元混合物在页岩储层纳微米孔隙中的吸附及驱替特性对准确评估和高效开采页岩气至关重要.本文从实验、理论以及模拟方面对页岩储层纳微米孔隙中CH_(4)的吸附特性、CO_(2)/CH_(4)二元混合物竞争吸附特性以及驱替特性进行了综合分析,对气体在纳微米孔隙中吸附及驱替特性的基础研究及关键问题进行讨论分析并提出了展望.研究表明CH_(4)在页岩储层中表现为物理吸附,有机质特征(丰度、成熟度、类型)、孔隙结构、无机矿物组成、温度和压力、含水率对页岩的CH_(4)吸附能力均有一定程度的影响.在相同条件下,CO_(2)比CH_(4)更易被页岩储层吸附,在页岩储层中注入CO_(2)可以促进CH_(4)的解吸,并有利于CO_(2)的地质埋存.开采方案的部署可采用井网形式的注采方式,可以通过调整注入井的位置、数量以及CO_(2)注入速率对开采方案进行优化.
Using CO_(2)to produce shale gas can not only improve shale gas recovery,but also save water resources and carry out geological storage of CO_(2),which is helpful to achieve carbon neutrality in shale gas production process.The gas migration mechanism in micro-nano pores of organic-rich shale reservoir is different from that of conventional reservoir.CO_(2)has supercritical properties in the reservoir,which makes the exploitation mechanism complicated and it is impossible to obtain an accurate understanding of the microscopic mechanism of CO_(2)exploitation of shale gas.Therefore,it is very important to study the adsorption and displacement characteristics of CH_(4),CO_(2)and their binary mixtures in micro-nano pores of shale reservoir for accurate evaluation and efficient exploitation of shale gas.In this paper,review on the adsorption properties of CH_(4),CO_(2)/CH_(4)binary mixture competitive adsorption and displacement properties in micro-nano pores of shale reservoir were carried out from three aspects:experiment,basic theory and numerical simulation.The key question and research trend on the CO_(2)/CH_(4)adsorption and displacement characteristics of micro-nano pores in shale reservoir has been discussed.The results show that CH_(4)is physically adsorbed in shale reservoirs,and the characteristics of organic matter(abundance,maturity and type),pore structure,inorganic mineral composition,temperature and pressure,and water content all have a certain degree of influence on CH_(4)adsorption capacity of shale.Under the same conditions,CO_(2)is more easily adsorbed by shale reservoir than CH_(4).Injecting CO_(2)into shale reservoir can promote the desorption of CH_(4)and facilitate the geological storage of CO_(2).The deployment of the production plan can adopt the injection production method in the form of well pattern.The production plan can be optimized by adjusting the location,number and CO_(2)injection rate of injection wells.
作者
邓佳
吕子健
张奇
宋付权
李久江
赵广杰
Deng Jia;LüZijian;Zhang Qi;Song Fuquan;Li Jiujiang;Zhao Guangjie(School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China;The Third Oil Production Plant of Sinopec Northwest Oilfield Company,Kuche 842000,Xinjiang,China;School of Petrochemical&Energy Engineering,Zhejiang Ocean University,Zhoushan 316022,Zhejiang,China)
出处
《力学学报》
EI
CAS
CSCD
北大核心
2021年第10期2880-2890,共11页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(11602227)
国家重大科技专项(2017ZX05072005)
河南省重点研发与推广专项(182102310891)资助项目。
