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Scratch Test Utilization to Characterize Contrasting Geomechanical Properties in Enhanced Geothermal System

机译:划痕试验利用,以增强地热系统对比地质力学性质的表征

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Enhanced geothermal systems (EGS) are reservoirs that have been stimulated to efficiently extract heat from low permeability high-temperature rocks. Hydraulic fracturing treatment is one of the most efficient stimulation techniques currently utilized in heat extraction from EGS. The subsurface reservoirs including EGS, are highly characterized by heterogeneous mechanical properties and geology, which includes pre-existing natural fracture networks that are filed with mineralization. In this paper, we present how heterogeneity in rock mechanical properties and geology will impact the extraction of heat from EGS. We utilized the Scratch test method to characterize the mechanical properties of a subsurface rock from a basin of high-temperature region. Our results show heterogeneous mineral and rock strength distributions over the rock sample length. In addition, our results show that the mechanical rock response of the stimulated geothermal system will not be the same as that of a homogenous isotropic rock volume. Further, we suggest the scratch test technique for the rapid characterization of geomechanical properties in EGS. Lastly, we recommend that modeling of fracturing for EGS should include a heterogeneous rock volume with detailed mechanical characteristics of the rock properties of individual mineralized zones or mineral zonation of the rock matrix. This work provides more insights to understand how the heterogeneity of fractomechanical behavior and geomechanical properties influence EGS.
机译:增强的地热系统(EGS)是已经刺激的储层,以有效地从低渗透性高温岩石中提取热量。液压压裂处理是目前在EGS中热萃取的最有效的刺激技术之一。包括EGS的地下储存器的高度特征在于异质机械性能和地质,包括预先存在的自然骨折网络,该网络被提交的矿化。在本文中,我们展示了岩石力学性能和地质中的异质性如何影响来自EGS的热量的提取。我们利用划痕试验方法来表征来自高温区域盆地的地下岩石的机械性能。我们的结果显示出在岩石样品长度上的异质矿物和岩石强度分布。此外,我们的结果表明,受刺激的地热系统的机械岩响应与均匀各向同性岩石体积的机械岩石响应不相同。此外,我们建议划痕测试技术,以便在EGS中快速表征地质力学性质。最后,我们建议对EGS的压裂建模应包括非均相岩石体积,具有具有单个矿化区的岩石性能的详细机械特性或岩石基质的矿物区划。这项工作提供了更多的见解,了解Fractomechach行为的异质性和地质力学性能影响EGS。

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