Measurements of Water Permeability in Unconsolidated Porous Media with Methane Hydrate Formation

Measurements of Water Permeability in Unconsolidated Porous Media with Methane Hydrate Formation
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甲烷水合物形成的松散多孔介质中水渗透率的测量

DOI:
10.3390/en6073622
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发表时间:
2013-07
期刊:
影响因子:
3.2
通讯作者:
Feng, Jing-Chun
Feng, Jing-Chun
中科院分区:
工程技术4区
文献类型:
--
作者:
Li, Bo;Li, Xiao-Sen;Li, Gang;Jia, Jia-Lin;Feng, Jing-Chun

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渗透率是决定水合物矿床流体流动能力和生产潜力的关键因素之一。在这项研究中,一个实验装置的开发,以调查多孔介质的流动特性,和水的渗透率测量在松散的多孔介质中有或没有水合物沉积在孔隙中。采用精确控制甲烷气体注入量的方法,在岩心样品中形成甲烷水合物,并通过气体饱和度和水合物饱和度的变化特征描述水合物的形成过程。研究发现,残余气体对水的流动起着阻碍作用,它往往会略微降低多孔介质中的水渗透率,特别是在高压条件下。岩心水合物形成后,在适当的注水量Q下,可以获得相对稳定的流动状态,此时水合物分解速率很慢。在本研究中,当水合物饱和度从0增加到9.3%时,多孔样品的绝对渗透率从49.2达西减小到1.2达西,表明k对水合物饱和度有很强的依赖性。
Permeability is one of the key factors that determine the fluids flow capacity and production potential of hydrate deposits. In this study, an experimental setup is developed to investigate the flow properties of the porous media, and the permeabilities to water are measured in the unconsolidated porous media with or without hydrate deposition in the pores. A specialized method of precisely controlling the amount of injected methane gas is employed to form methane hydrate in the core sample, and the hydrate formation process is described by the change characteristics of the gas and hydrate saturations. It is found that the residual gas plays an obstructive role in the water flow and it tends to slightly reduce the water permeability in the porous media, especially under high pressure conditions. After hydrate formation in the core sample, relatively steady flow state can be obtained under suitable water injection rate Q at which hydrate dissociation rate is very slow. The absolute permeability of the porous sample is reduced from 49.2 to 1.2 Darcies when the hydrate saturation increases from 0 to 9.3% in this study, indicating a strong dependence of k on the hydrate saturation.
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发表时间: 2007-05
影响因子: 1.5
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