论文标题
soultz-sous-forêts热杂种机械过程的直接数值模拟
Direct numerical simulation of thermo-hydro-mechanical processes at Soultz-sous-Forêts
论文作者
论文摘要
冷流体注入热弹性弹性应力场扰动引起的孔隙率和渗透率改变是从增强的地热系统（EGS）中提取更长，经济和更安全的热量的决定因素。在Soultz-sous-Forêts地热系统中，断层区域是主要的流动路径，与没有故障区域的区域相比，由于压力重新定向，由于压力重新定向而导致的孔隙率 - 渗透性的发展更为敏感。可用的操作和现场数据通过经过验证的数值模拟模型组合，以检查对压力和温度演化的机械影响。结果表明，在注入井孔区域附近，渗透率和孔隙率值受到应力场变化的强烈影响，并且渗透率变化将影响系统的总温度和压力，显示出完全耦合的现象。在断层区域内的某些区域并接近注入井孔，孔隙率会加倍，而渗透性可能会增强30次。从对机械方面的两个未知参数的敏感性分析得出，结果表明，只有一个参数对孔隙率 - 渗透率变化显着影响。在此参数上的进一步实验和现场工作将有助于对Soultz-sous-Forêts和其他地方的热量提取比以前更精确。
Porosity and permeability alteration due to the thermo-poro-elastic stress field disturbance from the cold fluid injection is a deciding factor for longer, economic and safer heat extraction from an enhanced geothermal system (EGS). In the Soultz-sous-Forêts geothermal system, faulted zones are the main flow paths and the resulting porosity-permeability development over time due to stress reorientation is more sensitive in comparison with the regions without faulted zones. Available operational and field data are combined through a validated numerical simulation model to examine the mechanical impact on the pressure and temperature evolution. Results shows that near the injection wellbore zones, permeability and porosity values are strongly affected by the stress field changes and the permeability changes will affect the overall temperature and pressure of the system demonstrating a fully coupled phenomenon. In some regions inside the faulted zones and close to the injection wellbores, the porosity doubles whereas permeability may enhance up to 30 times. From the sensitivity analysis on the two unknown parameters from the mechanical aspect is performed and results shows that only one of the parameters impacts significantly on the porosity-permeability changes. Further experimental and field works on this parameter will help to model the heat extraction from the Soultz-sous-Forêts and elsewhere more precisely than before.
