TY - Jour Au - Figueiredo,Bruno Au - Tsang,Chin-fu Au - Niemi,Auli Py - 2020 DA - 2020 / 01/06 - 耦合热机械过程对冷水注射液压力和温度的影响深层岩层中的骨折区域SP - 8947258 VL-2020 AB - 一种从升高的温度下产生从深层岩层的地热能的技术包括钻两个平行的深层钻孔,其中第二个是指导的,以便与产生的一系列裂缝相交通过液压压裂在第一个钻孔中。然后,第一钻孔用于注射冷水,第二孔用于生产被深层岩层加热的水。已经应用了一些非常有用的分析解决方案,用于在这种增强的地热系统(EGS)中的出水温度和注射/生产压力的快速估计,但他们没有考虑到热机械和流体力学效应对时间的影响压力和温度。本文提供了基于这些分析解决方案的EGS工程设计的帮助,通过评估热(T),流体力学(HM),热 - 水力 - 机械(THM)对流体孔隙压力和温度的影响。开发了一种热水 - 机械(THM)模型以模拟热岩层中的多个预先存在的裂缝区域的热萃取,通过考虑由于注射压力由于平均有效应力的变化而导致的渗透性变化。发现热效应(不与机械效应的耦合)导致骨折区域的透射率降低,并随后注射压力的增加,最大因数2.当温度恒定时,影响发现对流体孔隙压力的流体能效应可忽略不计,因为在这种情况下,平均有效应力的变化是3MPa,其与骨折区的初始渗透率的最大增加有关 1.2. Thermo-hydro-mechanical effects led to a maximum increase in the permeability of the fracture zones of approximately 10 times the initial value, which was associated with a decrease in the fluid pore pressure by a maximum factor of 1.25 and 2, when hydrological and thermohydrological effects were considered, respectively. Changes in temperature were found not to be affected significantly by the thermomechanical and hydromechanical effects, but by the flow rate in the fracture zones. A sensitivity analysis was conducted to study the influence of the number, the initial permeability, the elastic modulus and the residual porosity of the fracture zones, and the elastic modulus of the confining intact rock, on the simulation results. The results were found to be the most sensitive to the number and the initial permeability of the fracture zones. SN - 1468-8115 UR - https://doi.org/10.1155/2020/8947258 DO - 10.1155/2020/8947258 JF - Geofluids PB - Hindawi KW - ER -