Studies on geothermal power generation using abandoned oil wells

Studies on geothermal power generation using abandoned oil wells
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利用废弃油井进行地热发电的研究

DOI:
10.1016/j.energy.2013.07.008
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发表时间:
2013-09
期刊:
影响因子:
9
通讯作者:
Chang-Long Wang
Chang-Long Wang
中科院分区:
工程技术1区
文献类型:
--
作者:
Wen-Long Cheng;Tong-Tong Li;Yong-Le Nian;Chang-Long Wang

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在本文中,废弃的“干孔”油井威尔斯模拟作为一种地热能源发电。选择异丁烷作为工作流体。它被来自地质构造的地热能加热,并驱动涡轮机发电。提出了一种基于非稳态地层传热的模型。并对一口井深6000 m的废弃井进行了数值模拟。结果表明,随着系统运行时间的增加,采出井流体出口温度逐渐降低,最终趋于稳定。提高地层热导率或降低流体进入注入井的入口速度都可以缩短系统的稳定时间,但地层热容量对系统的稳定时间影响不大。净功率取决于获得的总热量和离开开采井的流体的出口温度。提高入口速度可以增加总热量,但降低流体出口温度。因此,存在流体进入注入井的最佳入口速度,以使指定地热热源的净功率最大化。
In this paper, abandoned “dry hole” oil wells are simulated as a source of geothermal power for generating electricity. Isobutane is chosen as the working fluid. It is heated by the geothermal energy from geologic formation and drives the turbine to generate electricity. A model based on transient formation heat transfer is presented. Furthermore, a numerical simulation for an abandoned well with a depth of 6000 m is performed. The result shows that the outlet temperature of fluid leaving the recovery well gradually decreases with the system operating time increasing and ultimately approaches stability. The stabilized time of the system can be shortened by either the increasing formation thermal conductivity or the decreasing inlet velocity of fluid entering the injection well but is not significantly influenced by the formation heat capacity. The net power depends on the total obtained heat and the outlet temperature of fluid leaving the recovery well. And increasing the inlet velocity can increase the total obtained heat but lower the fluid outlet temperature. Consequently there is an optimal inlet velocity of fluid entering the injection well to maximize the net power for a specified geothermal heat source.
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