| 题名 | 气力提升法海洋渗漏型天然气水合物开采技术研究; Studies of the production process of offshore seepage gas hydrate by airlifting |
| 作者 | 沈志远 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007-06-06 |
| 授予单位 | 中国科学院广州能源研究所 |
| 授予地点 | 广州能源研究所 |
| 导师 | 冯自平 |
| 关键词 | 天然气水合物 渗漏系统 气力提升 多相流 数值模拟 |
| 其他题名 | Studies of the production process of offshore seepage gas hydrate by airlifting |
| 中文摘要 | As a potential strategic energy resource, natural gas hydrate (NGH), which maybe the substitution of petroleum and natural gas in the future, is getting more and more attention. Methods being proposed for NGH recovery including thermal treatment, depressurization and inhibitor addition. But these methods cannot be economically or effective to NGH from the deep ocean floor. Therefore, the new technology is expected. Due to the features of high concentration and shallow buried depth, the seepage gas hydrate is considered as a kind of rich reservoir with high potential productivity. In this paper, a new production method of seepage gas hydrate has been provided，that is, the air-lifting technology, referring to the production of manganese nodes from deep sea . The purposes of this work are to develop a method of numerical simulation for gas-liquid-solid three-phase flow systems and to confirm a method of estimating performance of air-lifting for seepage gas hydrate. Finite difference equations for the numerical analysis were derived by integration of the partial differential equations based on the drift flux model for steady three-phase flow takes account of the dissociation of gas hydrate. The method of the numerical procedure is based on the SIMPLER algorithm. Flow characteristics of air-lift were presented. Effects of several factors, such as physical properties and delivered concentration of solid particals; inner diameter, length of each section of conveying pipe; volumetric flux of supplied air on flow characteristics were discussed. And the optimum operating conditions has been found. The results shows that this technology has very high productivity with only a little energy consumption. For hydrate under 3000m depth，the energy ratio can approach to 30 even with only 30％concentration of hydrate. This ratio is much higher than that of the traditional thermal stimulation method． |
| 语种 | 中文 |
| 公开日期 | 2011-07-10 ; 2011-07-15 |
| 页码 | 75 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/4003]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 沈志远. 气力提升法海洋渗漏型天然气水合物开采技术研究, Studies of the production process of offshore seepage gas hydrate by airlifting[D]. 广州能源研究所. 中国科学院广州能源研究所. 2007. |
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