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Numerical Simulation Study of the Parameters Effect on Temperature Distribution and Mining Life during EGS Exploitation, Yangyi of Tibet
Received date: 2015-06-15
Revised date: 2015-08-12
Online published: 2015-10-30
There is a rich geothermal energy in Yangyi area of Tibet and the potential energy of single well can be up to 10 MW. Utilization of Enhanced Geothermal System (EGS) technology in the exploitation of deep geothermal energy can alleviate the western energy shortage problem. An idealized 2D EGS numerical model was built to discuss the influence of production flow, injection-production pattern, injection temperature and other parameters on reservoir temperature distribution and mining life during the process of deep geothermal exploitation. 12 cases were designed based on the temperature information of Yangyi and the conclusions are as follows: production flow has a great influence on EGS exploitation, maximum production flow should be controlled below 0.028 kg/s to ensure commercial exploitation value for 50 years; considering the drilling cost, it is better to take high-injection-high-production and middle-injection-high-production pattern; the influence of injection temperature on the reservoir is small, any tail water between 40oC ~ 80oC can be reinjection into EGS reservoir to achieve the utilization of geothermal gradient.
Key words： EGS; geothermal reservoir; temperature distribution; mining life; flow rate
LING Lu-lu , SU Zheng , ZHAI Hai-zhen , WU Neng-you . Numerical Simulation Study of the Parameters Effect on Temperature Distribution and Mining Life during EGS Exploitation, Yangyi of Tibet[J]. Advances in New and Renewable Energy, 2015 , 3(5) : 367 -374 . DOI: 10.3969/j.issn.2095-560X.2015.05.008
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