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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >FRACTURE GENERATION IN ARTIFICIAL GEOTHERMAL RESERVOIRS UNDER SUPERCRITICAL WATER CONDITIONS
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FRACTURE GENERATION IN ARTIFICIAL GEOTHERMAL RESERVOIRS UNDER SUPERCRITICAL WATER CONDITIONS

机译：超临界水条件下人工地热油藏的裂缝生成

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摘要

This paper discusses the generation of micro-fractures in a granite under a super critical water environment. In order to create an artificial pathway of water in a geothermal reservoir with limited permeability, hydraulic stimulation technology is commonly employed. In this study, simulated hydraulic stimulation tests were performed using thick-walled cylindrical specimens of 45 mm outer diameter, under temperatures up to 600℃ and confining pressures up to 100 MPa. The experimental results showed that there was no macroscopic fracturing in the high temperature regime where the predominant fluid flow occurred. The permeability of the granite was also measured using the same cylindrical specimen configuration as was used in the simulated hydraulic stimulation tests. The permeability test results showed that the permeability of the granite was enhanced drastically when the temperature exceeded the critical point of water, whilst no significant increase in the permeability was observed under the subcritical water condition. Optical microscopy of the microstructural change revealed that the enhanced permeability was due to the formation of micro-fractures under the supercritical water environment. This laboratory-scale test result suggests that it may be possible to generate a micro-fracture network by injecting water into a high temperature rock mass whose conditions exceed the critical point of water and to extract the heat energy through the generated fracture network from the supercritical rock mass.
机译：本文讨论了在超临界水环境下花岗岩中微裂缝的产生。为了在具有有限渗透率的地热储层中创建水的人工路径，通常采用水力增产技术。在这项研究中，模拟的水力刺激试验是使用外径为45 mm的厚壁圆柱试样在温度高达600℃，围压高达100 MPa的条件下进行的。实验结果表明，在主要流体流动发生的高温区域，没有宏观破裂。花岗岩的渗透率也使用与模拟水力刺激试验中所用的相同的圆柱形试样构型进行测量。渗透性测试结果表明，当温度超过水的临界点时，花岗岩的渗透性显着提高，而在亚临界水条件下，渗透性没有显着增加。光学显微镜观察到的微观结构变化表明，渗透性增强是由于在超临界水环境下形成了微裂缝。该实验室规模的测试结果表明，有可能通过将水注入条件超过水的临界点的高温岩体中来生成微裂缝网络，并通过所产生的裂缝网络从超临界中提取热能。岩体。

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