水合物热激励法开采特征研究

Study on Gas hydrates Production by Thermal Stimulation

根据天然气水合物的分子动力学分解规律，建立了热激励法开采模型，并运用有限差分法对压力和温度控制方程进行了数值求解。计算结果表明，地层渗透率和井底加热温度对开采过程中地层的压力、温度分布以及气体的产量变化影响较大。由于模型中同时考虑了水合物的分解和再合成反应（可逆反应），因此，天然气的产量随时间呈明显的周期性变化趋势，而且随着时间增长，周期逐渐变长。

Based on the kinetuc model of netural gas hydrates decomposition,a production mode by themal stimulation is established, and the equations of pressure and temperature are using finite difference method. The numerical calculation results show that permeability and well bottom heating temperature greatly impact the distributions of pressure and temperature and the natural gas output. Because the decomposition and formation（counter-reaction）of hydrates are all considered in the model, the output of gas change periodically. Furthermore, with the time evolution, the period increases.