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Characterization of Hydraulically Induced Fracture in Lab-scale Enhanced Geothermal Reservoir

机译:实验室规模的增强型地热油藏水力致裂特征

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Geothermal energy production by water circulation in man-made fracture systems is referred to as enhanced or engineered geothermal systems (EGS) production. The fluid/heat flow properties of the induced fracture are essential for predicting later geothermal development. In this work, we study the creation and characterization of hydraulically induced fracture on a laboratory scale using acoustic emission (AE) cloud, spontaneous potential (SP), and tracer analysis. To achieve this goal, we have performed reservoir stimulation using 13x13x13 inch3 cubical rock samples under representative in-situ stress regimes. During this stimulation stage and the subsequent production processes, sensors are used on the block surfaces and within cavities and wellbores to characterize and locate acoustic emissions (AE) caused by the stimulation, and to monitor local changes in fluid pressure, temperature, and electrical self-potential (SP). Cold water is injected centrally and simultaneously collected from nearby miniature production wells. Water with tracer was injected after the circulation test, and concentrations in fluid collected from the production wells could be measured. The data collected could be then analyzed to develop a better understanding of the fractures and the induced fracture permeability and fluid/heat flow.
机译:人为压裂系统中通过水循环产生的地热能被称为增强或工程地热系统(EGS)生产。诱发裂缝的流体/热流特性对于预测以后的地热发育至关重要。在这项工作中,我们使用声发射(AE)云,自发势能(SP)和示踪剂分析研究了在实验室规模上水力诱发裂缝的产生和特征。为实现这一目标,我们在有代表性的原地应力条件下使用13x13x13 inch3立方岩样品进行了储层增产。在此刺激阶段和随后的生产过程中,将传感器用于块体表面以及型腔和井眼内,以表征和定位由刺激引起的声发射(AE),并监视流体压力,温度和电自我的局部变化。 -电位(SP)。集中注入冷水,并同时从附近的微型生产井中收集冷水。循环测试后注入带示踪剂的水,并可以测量从生产井中收集到的流体中的浓度。然后可以对收集到的数据进行分析,以更好地理解裂缝以及引起的裂缝渗透率和流体/热流。

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