Experimental investigation on the effective thermal conductivities of different hydrate-bearing sediments  

作　　者：Xingxun Li Rucheng Wei Qingping Li Weixin Pang Qi Fan Guangjin Chen Changyu Sun 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum-Beijing,Beijing,102249,China [2]State Key Laboratory of Natural Gas Hydrate,CNOOC Research Institute Co.,Ltd.,Beijing,100027,China

出　　处：《Petroleum Science》2023年第4期2479-2487,共9页石油科学（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(U19B2005,21808238,U20B6005,22127812);the National Key Research and Development Program of China(2021YFC2800902).

摘　　要：The natural gas hydrate has been regarded as an important future green energy.Significant progress on the hydrate exploitation has been made,but some challenges are still remaining.In order to enhance the hydrate exploitation efficiency,a significant understanding of the effective thermal conductivity(ETC)of the hydrate-bearing sediment has become essential,since it directly controls the heat and mass transfer behaviors,and thereby determines the stability of hydrate reservoir and production rate.In this study,the effective thermal conductivities of various hydrate-bearing sediments were in-situ measured and studied.The impacts of temperature,particle size and type of sediment were investigated.The effective thermal conductivities of the quartz sand sediments before and after hydrate formation were in-situ measured.The results show the weak negative correlation of effective thermal conductivity of the quartz sand sediment on the temperature before and after the hydrate formation.The effective thermal conductivity of the hydrate-bearing sediment decreases with the increase of particle size of the sediment.The dominant effect of the type of porous medium on the characteristics of the effective thermal conductivity of hydrate-bearing sediment was highlighted.The results indicate that both the effective thermal conductivities of hydrate-bearing quartz sand sediment and hydrate-bearing silicon carbide sediment are weakly negatively correlated with temperature,but the effective thermal conductivity of hydrate-bearing clay sediment is weakly positively dependent on the temperature.In addition,the values of the effective thermal conductivities of various hydrate-bearing sediments are in the order of hydrate-bearing silicon carbide sediment>hydrate-bearing quartz sand sediment>hydrate-bearing clay sediment.These findings could suggest that the intrinsic thermal conductivity of porous medium could control the characteristics of effective thermal conductivity of hydrate-bearing sediment.

关 键 词：HYDRATE Thermal conductivity SEDIMENT Heat transfer In-situ measurement 

分 类 号：TE37[石油与天然气工程—油气田开发工程]