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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >DEVELOPMENT OF A NEW TEMPERATURE CONTROLLED TRUE-TRIAXIAL APPARATUS FOR SIMULATING ENHANCED GEOTHERMAL SYSTEMS (EGS) AT THE LABORATORY SCALE
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DEVELOPMENT OF A NEW TEMPERATURE CONTROLLED TRUE-TRIAXIAL APPARATUS FOR SIMULATING ENHANCED GEOTHERMAL SYSTEMS (EGS) AT THE LABORATORY SCALE

机译：开发用于在实验室规模上模拟增强的地热系统（EGS）的新型温控真三轴设备

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The prediction of hydraulically induced fractures and the characterization of these fractures for fluid flow and heat transfer is a limiting factor in the development of Enhanced Geothermal Systems (EGS) technology. To study hydraulically induced fractures in crystalline rock reservoirs, a new true-triaxial apparatus was developed and tested. The apparatus is capable of applying three independently controlled principal stresses up to 12 MPa and temperatures as high as 180 deg C to a 30x30x30 cm cubical rock sample. Hydraulic fracturing is performed from hydraulic tubing installed in 10 mm oriented boreholes which are drilled into a pressurized sample. Fracturing fluid pressures up to 70 MPa can be applied with volumetric flow rates as low as 0.00001 mL/min allowing for high strength rocks to be fractured and fracture extents to be contained within the 30 cm sample. With a second borehole drilled to intercept the induced fracture, fluid circulation experiments are performed to characterize the thermal properties of the reservoir. Sensor systems measure temperatures, pressures, flow rates, and strains such that the fluid state and rock loading parameters can be monitored for use in the validation of a computer model currently being developed. Initial testing has been performed on an artificial granite sample to calibrate the system. The artificial granitite sample is created using a specialized high performance concrete designed to replicate Colorado Red Granite as available from local quarries. Using fine aggregate silica fume concrete allows for the creation of cast homogenous samples with a greater uniformity of axial stress distributions and controllable internal discontinuities. Tested parameters for characterizing the rock include unconfined compressive strength, indirect tensile strength, mode I fracture toughness, elastic modulus, thermal conductivity, specific heat capacity, coefficient of thermal expansion, porosity and permeability. The triaxial system is designed to allow for future application of acoustic emission (AE) fracture monitoring for relating the laboratory data to field tests and a proppant injection system will also be applied to analyze the effect of proppant and high viscosity fluid injections on the fracture thermal characteristics.
机译：液压诱导的骨折的预测及其对流体流动和传热的这些裂缝的表征是增强地热系统（EGS）技术的开发中的限制因素。为了在晶体岩石储层中研究液压诱导的骨折，开发并测试了一种新的真正的三轴仪器。该装置能够将三个独立控制的主应力施加到12MPa和高达180℃的温度至30x30x30cm立方岩样。液压压裂由安装在10mm定向钻孔中的液压管进行，该钻孔钻入加压样品中。压裂流体压力可高达70MPa的体积流量速率低至0.00001ml / min，允许高强度岩石被裂缝和骨折块含有30cm样品。通过钻钻的第二钻孔以拦截诱导的断裂，进行流体循环实验以表征储存器的热性质。传感器系统测量温度，压力，流速和菌株，使得可以监控流体状态和岩石加载参数，以便用于当前正在开发的计算机模型的验证。已经在人造花岗岩样品上进行了初始测试以校准系统。使用专业的高性能混凝土创建人造诱饵样品，该专用高性能混凝土旨在将科罗拉多州红色花岗岩复制，如当地采石场。使用精细聚集体硅烟混凝土允许创建具有更大均匀性均匀性分布和可控内部不连续性的铸造均匀样品。用于表征岩石的测试参数包括不包含狭窄的抗压强度，间接拉伸强度，模式I断裂韧性，弹性模量，导热性，热量，热膨胀系数，孔隙率和渗透性。三轴系统旨在允许将来应用声发射（AE）断裂监测，以将实验室数据与现场测试相关，并且还将应用支撑剂注射系统来分析支撑剂和高粘度流体注入对骨折热的影响特征。

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