Engineered Geothermal Systems (EGS) are promising, but high-risk targets for baseline energy generation. Technology breakthrough is needed to lower the high risks from largely unknown geologic variables and the limited control of the coolant flow field underground. A new, robust EGS (REGS) arrangement and creation technology is reviewed featuring innovative fracture opening, stabilization and permeability control. The geometry, aperture support technique and coolant fluid flow isolation system are all robustly planned and created according the inventive concept. The new elements of the REGS technology are (1) the step-by-step creation, control, and tests of hydraulic fracturing to achieve a planar wing fracture or fractures osculating along the well trajectory; (2) fracture stabilization by hardening grouting injection to create a central support island in each planar wing fracture for zonal isolation; and (3) well-fracture-well fluid circulation for geothermal energy extraction from single, or clustered planar fractures as geothermal heat exchangers. The paper reviews ongoing tests to prove the key components of the REGS geologic heat exchanger with stabilized, large fracture aperture and controlled flow zones for minimized opening pressure loss, seismicity and maximized energy extraction. Flow fields and heat transport are reviewed around zonal isolation of fracture flow by a grouted, blocking island for heat exchange. The robustness is reviewed for the step-by-step construction of a REGS. The paper reports new results from using numerical, coolant flow and heat exchange models to demonstrate the geothermal energy potential of a single REGS well drilled in hot, dry rock.

中文翻译：

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单断裂，坚固，工程地热系统的能量潜力

工程地热系统（EGS）前景广阔，但基线能源发电的高风险目标。需要技术突破以降低很大程度上未知的地质变量和地下冷却液流场的有限控制带来的高风险。审查了一种新的，稳健的EGS（REGS）布置和生成技术，该技术具有创新的裂缝开度，稳定作用和渗透率控制功能。几何形状，孔口支撑技术和冷却剂流体流动隔离系统均根据本发明构思被稳健地计划和创建。REGS技术的新要素包括：（1）逐步创建，控制和测试水力压裂，以实现平面机翼裂缝或沿井眼轨迹振荡的裂缝；（2）通过硬化注浆来稳定裂缝，在每个平面机翼裂缝中形成一个中央支撑岛，以进行区域隔离；（3）压裂井流体循环，用于从单个或成簇的平面裂缝中作为地热热交换器提取地热能。本文回顾了正在进行的测试，以证明REGS地质换热器的关键组件具有稳定，较大的裂隙孔径和受控的流动区域，以最大程度地减少开启压力损失，地震活动性和最大程度的能量提取。通过注浆的阻塞岛进行热交换，围绕裂隙流的区域隔离对流场和传热进行了回顾。复习了REGS的稳健性。该论文报告了通过使用数值，