Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media |
| |
Authors: | Xuke Ruan Xiao-Sen Li |
| |
Affiliation: | Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China |
| |
Abstract: | The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate dissociation. In this study, the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous media. The experiments of methane hydrate depressurization-induced dissociation were performed in a 1D high pressure cell filled with glass beads, an improved and valid 1D core-scale numerical model was devel-oped to simulate gas production. Two conceptual models for hydrate dissociation surface area were pro-posed based on the morphology of hydrate in porous media, which formed the functional form of the hydrate dissociation surface area with porosity, hydrate saturation and the average radius of sand sedi-ment particles. With the establishment of numerical model for depressurization-induced hydrate disso-ciation in porous media, the cumulative gas productions were modeling and compared with the experimental data at the different hydrate saturations. The results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area, and the grain-coating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation, whereas at higher hydrate saturation, the hydrate dissociation simulation from the pore-filling surface area model is more reason-able. Finally, the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production. |
| |
Keywords: | Surface area Methane hydrate Hydrate dissociation Hydrate morphology Depressurization |
本文献已被 万方数据 等数据库收录! |
| 点击此处可从《中国化学工程学报》浏览原始摘要信息 |
|
点击此处可从《中国化学工程学报》下载全文 |
|