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Use of tracers and temperature to estimate fracture surface area for EGS reservoirs

机译:利用示踪剂和温度估算EGS油藏的裂缝表面积

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摘要

A key uncertainty in the design and long-time behavior of EGS reservoirs, and their management, is the fracture surface area that controls the rate of heat transfer between the host rock and the circulating injected water. A workflow is developed that uses analytic solutions to estimate this surface area. We first analyze a tracer test to estimate the fracture pore volume swept, the flow geometry, and the presence of multiple fractures (or damage zones around the primary fracture). Using this information about fracture properties, an analytic solution describing produced temperature vs. time can be solving iteratively to estimate surface area. In the case of multiple fractures, we show that the equation governing the produced fluids' temperature is superposed to estimate the surface area. The workflow is shown to be robust, even in the presence of heterogeneity.
机译:EGS储层的设计,长期行为及其管理的关键不确定因素是控制主体岩体与循环注入水之间的传热速率的裂缝表面积。开发了使用分析解决方案来估算此表面积的工作流。我们首先分析示踪剂测试,以估算扫掠的裂缝孔隙体积,流动几何形状以及多个裂缝(或主要裂缝周围的破坏带)的存在。使用有关断裂特性的信息,描述生产温度随时间变化的解析解决方案可以迭代求解,以估算表面积。在发生多处裂缝的情况下,我们证明了控制采出液温度的方程被叠加以估算表面积。即使存在异构性,工作流也显示出强大的功能。

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  • 来源
    《Geothermics》 |2017年第5期|40-47|共8页
  • 作者

    Shook G. Michael; Suzuki Anna;

  • 作者单位

    Mike Shook & Associates, Houston, TX 77091 USA;

    Stanford Univ, Stanford, CA USA;

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  • 原文格式 PDF
  • 正文语种 eng
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