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首页> 美国政府科技报告 >Secondary Recovery Method for the Extraction of Geothermal Energy. Final Report Consisting of Two Sections: (1) Short Review of the Technique of Forced Geoheat Recovery from Sheet-Like Fluid Conductors; (2) Heat Transfer Effects in Forced Geoheat Recovery Systems. Reporting Period: July 1, 1976--December 31, 1977
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Secondary Recovery Method for the Extraction of Geothermal Energy. Final Report Consisting of Two Sections: (1) Short Review of the Technique of Forced Geoheat Recovery from Sheet-Like Fluid Conductors; (2) Heat Transfer Effects in Forced Geoheat Recovery Systems. Reporting Period: July 1, 1976--December 31, 1977

机译：地热能提取的二次回收方法。最终报告包括两个部分：（1）从片状流体导体强制地热回收技术的简要回顾; （2）强制地热回收系统的传热效应。报告期：1976年7月1日 - 1977年12月31日

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Forced geoheat recovery using naturally occurring fluid conductors, viz., fault zones, basaltic dikes, and open formation contacts are considered in terms of the system physical-economic feasibility. The heat transfer surface area required for an economically viable forced recovery system for direct contact heating applications is estimated based on various geologic and economic parameters. Heat extraction from a hot rock formation based on sheet-like flow involves a balance of the total heat transport of the heat extracting fluid with the conductive heat transport within the rock. The heat recovery efficiency is considered in terms of an idealized flow model in order to estimate the required heat transfer surface area. Various flow characteristics adverse to heat recovery efficiency are likely to occur within the fluid conductors under consideration. These include primarily non-uniform flow within the conductor and fluid losses due to leakage from the conductor. The first order effects of these adverse flow conditions are considered in terms of the idealized flow model using analytic and semi-analytic methods. Furthermore, a significant change in fracture premeability can occur within the conductor due to the thermoelastic response of the rock formation upon cooling. This effect is estimated in terms of the idealized flow model under various flow conditions within the conductor. The results of this work indicate that, under current economic conditions and regional geothermal gradients of 50 exp 0 C/km or more, the minimum heat transfer surface area per injection/production borehole pair required for an economically viable direct-contact heating system with a 10 to 20 year system lifetime is less than 1 km exp 2 . Under the same conditions, it is found that the minimum required heat transfer surface area for electrical power production systems is 2 to 4 times this figure. (ERA citation 04:007906)

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