含甲烷水合物的玻璃珠渗透率实验与簇状等径颗粒模型  

Permeability experiment of glass beads containing methane hydrate and clustered equal diameter particle model

作　　者：肖长文 李小森 李刚[2] 余杨[1] 余建星[1] 李世龙[3] 吕秋楠 XIAO Changwen;LI Xiaosen;LI Gang;YU Yang;YU Jianxing;LI Shilong;LÜQiunan(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;China Special Aircraft Research Institute,Jingmen,Hubei,448004)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]中国科学院广州能源研究所,广东广州510640 [3]中国特种飞行器研究所,湖北荆门448004

出　　处：《中南大学学报（自然科学版）》2022年第3期846-854,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51976228,51736009);中国科学院前沿科学重点研究项目(QYZDBSSWJSC028,QYZDJ-SSW-JSC033);广东省促进经济发展专项资金(海洋经济发展用途)资助项目(GDME-2020D044)。

摘　　要：为研究天然气水合物对沉积物渗透率的影响,首先,利用含甲烷水合物的多孔介质渗透率测量实验装置,在BZ-02型玻璃珠(平均粒径为228.4μm)中生成甲烷水合物;其次,采用稳态注水法测量不同甲烷水合物饱和度下多孔介质的水相有效渗透率;最后,根据多孔介质堆积模式与水合物的生成形态,提出了簇状等径颗粒模型。研究结果表明:采用多次注水增压的方法,可以有效提高反应釜内的水合物生成速率;在渗透率测量过程中,反应釜两端的差压随时间先上升,而后保持较长时间稳定;在较低水合物饱和度(低于15%)条件下,有效渗透率随甲烷水合物饱和度增大而逐步减小;玻璃珠的堆积模式为斜方排列堆积,甲烷水合物在孔隙中的赋存形式为簇状等径球状颗粒,孔隙内表面积随着甲烷水合物颗粒个数增多而增大;当ARCHIE饱和度指数n为10时,簇状等径颗粒模型与实验数据吻合度较好,含水合物与不含水合物时的多孔介质渗透率之比与甲烷水合物饱和度呈指数递减关系。In order to study the influence of natural gas hydrate on the permeability of sediments,firstly,methane hydrates were generated in BZ-02 glass beads(with an average particle size of 228.4μm)in the permeability apparatus.Secondly,steady water injection method was used to measure the water effective permeability of porous media with different methane hydrate saturations.Finally,a clustered equal-diameter particle model was proposed according to accumulation mode of porous media and growth habit of hydrate.The results show that the rate of hydrate formation can be effectively improved by the method of multiple water injection and pressurization.During the permeability measurement,the differential pressure at both ends of the reactor firstly increases with time and then remains stable for a long time.The effective permeability gradually decreases with the increase of methane hydrate saturation(with hydrate saturation of less than 15%).The accumulation of glass beads is orthorhombic and the hydrate in the pores is clustered spherical particles of equal diameter.The internal surface area of pore space increases with the increase of the hydrate particles.When the ARCHIE saturation exponent n is 10,the fitting data of clustered equal-diameter particle model is consistent with the experimental data.The ratio of permeability of porous media between hydrate and non-hydrate is exponentially decreasing with the increase of hydrate saturation.

关 键 词：甲烷水合物 玻璃珠 水相渗透率 水合物饱和度 等径颗粒 

分 类 号：TE311[石油与天然气工程—油气田开发工程]