Abstract:

This paper investigates the flow characteristics of dissociated methane gas and water from methane hydrate (MH) by ethylene glycol (EG) injection in porous sediments by utilizing a one-dimensional experimental apparatus.With the developed apparatus, the experiment was run for hydrate dissociation with the chemical inhibitor stimulation method by injecting EG solution with different concentrations and rates.The experimental result suggested that the gas production process was generally divided into four steps: initial injection, chemical inhibitor dilution, hydrate dissociation,production of remaining gas.However, the water production rate keeps nearly constant during the whole production process.Under the experimental condition, the production efficiency was affected by both EG concentration and injection rate, and it reached a maximum with the EG concentration of 60%(mass).

Key words:

甲烷水合物, 乙二醇, 沉积物

摘要：

在甲烷水合物一维分解模拟系统上，进行了模拟注乙二醇溶液分解甲烷水合物的实验研究。使用甲烷气体与纯水在一定温度、压力条件下，在沉积物中合成水合物。通过以不同速率注入不同浓度的乙二醇溶液，研究了化学法分解水合物过程中甲烷气体和水生产规律。实验结果表明，水合物分解产出甲烷气体的过程主要分为4个阶段：初始注入段、化学剂稀释段、水合物分解段和残余气体产出段。整个分解过程中，水的生产速率几乎保持恒定。通过对实验结果的能量分析表明，本实验条件下分解综合效率在0.20～0.88之间，并且受注入速率和化学剂浓度影响。在恒定注入速率条件下，分解效率在化学剂质量分数为60%时达到最大值。

关键词:

甲烷水合物, 乙二醇, 沉积物