A numerical study of non-Darcy flow in EGS heat reservoirs during heat extraction
A numerical study of non-Darcy flow in EGS heat reservoirs during heat extraction
复制标题
EGS热库排热过程中非达西流动的数值研究
DOI：
10.1007/s11708-019-0612-4
复制
发表时间：
2019-09
影响因子：
2.9
通讯作者：
Jiang Fangming
中科院分区：
文献类型：
--
作者：
Cao Wenjiong;Huang Wenbo;Wei Guoling;Jin Yunlong;Jiang Fangming
地下非达西流体流动在石油工业中已经观察和研究了几十年。通过类比推导，在一定条件下，强化地热系统（EGS）热储中的流体流动也可能处于非达西区。本文建立了考虑EGS热储中非达西流体流动的三维瞬态模型，模拟EGS长期取热过程。在此基础上，对水基和超临界CO2（SCCO 2）基EGS的非达西流动特性进行了模拟和讨论。结果表明，非达西效应不仅降低了EGS热储中渗流的达西阻力，而且还降低了EGS的热提取率。与水-EGS相比，SCCO 2-EGS更容易经历更强的非达西流，这是由于SCCO 2的流动性大得多。因此，SCCO 2-EGS中的非达西流动可能大大降低其热提取性能。在此基础上，分析并提出了EGS热储非达西渗流开始的判据。采用流体流量和油藏初始热状态，计算了EGS的特征Forchheimer数。当计算的Forchheimer数大于0.2时，EGS热储的流体流动表现出不可忽略的非达西流动特征。
Underground non-Darcy fluid flow has been observed and investigated for decades in the petroleum industry. It is deduced by analogy that the fluid flow in enhanced geothermal system (EGS) heat reservoirs may also be in the non-Darcy regime under some conditions. In this paper, a transient 3D model was presented, taking into consideration the non-Darcy fluid flow in EGS heat reservoirs, to simulate the EGS long-term heat extraction process. Then, the non-Darcy flow behavior in water- and supercritical CO2(SCCO2)-based EGSs was simulated and discussed. It is found that non-Darcy effects decrease the mass flow rate of the fluid injected and reduce the heat extraction rate of EGS as a flow resistance in addition to the Darcy resistance which is imposed to the seepage flow in EGS heat reservoirs. Compared with the water-EGS, the SCCO2-EGS are more prone to experiencing much stronger non-Darcy flow due to the much larger mobility of the SCCO2. The non-Darcy flow in SCCO2- EGSs may thus greatly reduce their heat extraction performance. Further, a criterion was analyzed and proposed to judge the onset of the non-Darcy flow in EGS heat reservoirs. The fluid flow rate and the initial thermal state of the reservoir were taken and the characteristic Forchheimer number of an EGS was calculated. If the calculated Forchheimer number is larger than 0.2, the fluid flow in EGS heat reservoirs experiences non-negligible non-Darcy flow characteristic.
登录
查看更多内容
影响因子：
--
作者：
T. Friedel;H. Voigt
通讯作者：
T. Friedel;H. Voigt
影响因子：
4.7
作者：
Z. Wen;Guanhua Huang;Hongbin Zhan
通讯作者：
Z. Wen;Guanhua Huang;Hongbin Zhan
DOI：
10.1016/j.icheatmasstransfer.2010.08.016
发表时间：
2010-12
影响因子：
7
作者：
M. H. Fard;K. Hooman;H. Chua
通讯作者：
M. H. Fard;K. Hooman;H. Chua
DOI：
10.1016/j.jrmge.2015.05.003
发表时间：
2016-02
影响因子：
7.3
作者：
Chaoshui Xu;P. Dowd;Qi Li
通讯作者：
Chaoshui Xu;P. Dowd;Qi Li
影响因子：
10.4
作者：
Pruess, Karsten
通讯作者：
Pruess, Karsten