含水合物多孔介质内驱替与相变演化规律及耦合模型研究  

Evolution and Model Coupling Displacement and Phase Change in Hydrate-bearing Porous Media

作　　者：杨明军[1] 赵国钧 郑嘉男 罗坤[2] 宋永臣[1] YANG Mingjun;ZHAO Guojun;ZHENG Jianan;LUO Kun;SONG Yongchen(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian 116024,China;Shanghai Institute for Advanced Study,Zhejiang University,Shanghai 201203,China)

机构地区：[1]大连理工大学海洋能源利用与节能教育部重点实验室,大连116024 [2]浙江大学上海高等研究院,上海201203

出　　处：《工程热物理学报》2024年第12期3730-3735,共6页Journal of Engineering Thermophysics

基　　金：国家重点研发计划(No.2021YFC2800902);国家自然科学基金(No.52227812,No.52306205)。

摘　　要：海洋水合物沉积层下方常常伴有发育良好的天然气,海底无论是冷泉自然现象还是天然气开采均涉及多孔介质内多相驱替与相变耦合作用这一关键科学问题。目前,仍缺乏针对甲烷在水饱和水合物储层内流动的研究,特别是流动阻滞研究。本文通过模拟沉积层内甲烷渗流过程,重点关注驱替和渗流两个流动阶段。结果表明,驱替过程中水合物层的毛细作用阻碍甲烷流动,造成流动压力升高;甲烷突破储层阻滞效应后进入渗流阶段,且对比发现驱替突破压力与储层水合物饱和度显著正相关。本文综合考虑水合物与流体间多类型作用,建立了水合物储层多相流动与相变耦合模型,预测结果与实验结果高度吻合。本研究对深入理解水合物成藏过程与指导水合物开采具有重要作用。The well-developed natural gas often coexists beneath marine hydrate deposits.Both natural phenomena such as cold seeps and natural gas exploitation on the seabed involve the crucial scientific issue of multiphase displacement and phase transition coupling within porous media.Cur-rently,there is a lack of research on the flow of methane within water-saturated hydrate reservoirs,particularly on flow impedance.In this study,we focus on simulating the process of methane seepage within sedimentary layers,with particular attention to two flow stages:displacement and seepage.The results indicated that the capillary action of hydrate layer impeded methane fow during the displacement process,resulting in an increase in fow pressure.After methane broke through the reservoir impedance,it entered the seepage stage.A comparative analysis revealed a significant pos-itive correlation between displacement breakthrough pressure and hydrate saturation in the reservoir.By considering multiple types of interactions between hydrates and fuids,we established a coupled model of multiphase fow and phase transition in hydrate reservoir,with predicted results highly consistent with experimental findings.This study plays a crucial role.

关 键 词：天然气水合物 多孔介质 驱替–渗流 相变 

分 类 号：TE375[石油与天然气工程—油气田开发工程]