| 李淑霞*,陈月明,张卫卫,夏晞冉.多孔介质中天然气水合物注热+降压开采的实验研究[J].实验力学,2011,26(2):202~208 |
| 多孔介质中天然气水合物注热+降压开采的实验研究 |
| Experimental Study of Natural Gas Hydrate Dissociation in Porous Media by Thermal Stimulation and Depressurization |
| 投稿时间：2010-10-12 修订日期：2010-11-06 |
| DOI： |
| 中文关键词: 天然气水合物 注热 降压 实验 |
| 英文关键词:natural gas hydrate thermal stimulation depressurization experimental study |
| 基金项目:中央高校基本科研业务费专项资金资助(09CX05001A) |
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| 中文摘要: |
| 为研究注热与降压相结合的开采方式是否更加有利于天然气水合物的开采,在自制的天然气水合物开采模拟实验系统上进行了实验研究。在一维填砂模型中人工生成天然气水合物之后,进行先注热盐水然后再降低压力（注热+降压）的开采模拟实验,分析了开采过程中系统温度、电阻率变化规律以及产气量、能量效率等。结果表明：产气规律具有明显的阶段性,各测点的温度、电阻率变化能够很好地反应水合物分解的动态变化过程。通过对不同开采方式下能量效率的对比分析可以看出：单纯注热盐水时能量效率仅为1.80,但将注热盐水与降压相结合时,能量效率可增大到2.88,这说明注热与降压相结合的开采方式可获得更大的能量效率,更有利于水合物的开采。 |
| 英文摘要: |
| In order to investigate whether the combination of thermal stimulation and depressurization is propitious to natural gas hydrate (NGH) dissociation, experimental study was carried out by using a special-designed experimental system of NGH. NGH was formed artificially in a one-dimensional sand-packing tube. Then NGH dissociation experiment was performed by injecting hot-brine and then decreasing pressure (thermal stimulation plus depressurization). The change of temperature, resistivity, gas production rate and energy efficiency during the NGH dissociation were analyzed. Experimental results show that the process of gas production can be obviously divided into different stages. The temperature and resistivity change at measuring points reflects clearly the dynamic characteristics of NGH dissociation process. The comparison of energy efficiency from different methods shows that the energy efficiency is 1.8 when only thermal stimulation is used, and it increases to 2.88 when thermal stimulation is combined with depressurization. Above results indicate that thermal stimulation together with depressurization can achieve higher energy efficiency and is a better method for NGH dissociation. |
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