超临界二氧化碳注入后干热岩力学性能演变研究

IF 2.9 2区 地球科学 Q3 ENERGY & FUELS
Pan Li, Hongxue Zhang, Yu Wu
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引用次数: 0

摘要

表征超临界二氧化碳(CO2(sc))注入后干热岩(HDR)力学性能的变化,对于评估基于二氧化碳的强化地热系统的热提取率和储层安全性至关重要。本研究设计了在 150-300 ℃ 的花岗岩中不注入 CO2(sc)、注入 CO2(sc)和交替注入水-CO2(sc)(AIWC)的三轴渗流和力学性能实验。实验揭示了 HDR 储层中单相 CO2 区、CO2-水两相区和溶解 CO2 液相区的力学特性。结果表明,岩石样品的破坏模式在不注入 CO2(sc)和 AIWC 后主要表现为突发性失稳,而在注入 CO2(sc)后则主要表现为渐进性失稳。与 25 ℃ 相比,不注入二氧化碳(sc)后 150-300 ℃ 的单轴抗压强度(UCS)下降了 13.86%-32.92%。注入二氧化碳(sc)后,UCS 下降了 40.79%-59.60%。注入 AIWC 后,UCS 下降了 27.74%-40.48%。这表明单相 CO2 区的岩体强度低于其他两个区,并且这种减弱现象随着温差的增大而加剧。在相同温度下,注入 AIWC 后的弹性模量大于不注入 CO2(sc)和注入 CO2(sc)后的弹性模量。在不注入二氧化碳(sc)的情况下,当温度升高到 200 ℃ 和 300 ℃ 时,分别出现了晶间裂纹和跨晶裂纹。AIWC 后,方解石等矿物晶体在相连的大裂缝表面析出,并伴有高岭石粘土矿物。这增加了矿物颗粒的摩擦接触,提高了 HDR 储层的稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on the evolution of mechanical properties of hot dry rocks after supercritical CO2 injection

Characterizing the evolution of mechanical properties of hot dry rock (HDR) after supercritical CO2 (CO2(sc)) injection is crucial for assessing the heat extraction rate and reservoir security of CO2 based enhanced geothermal systems. This study designed the experiments of triaxial seepage and mechanical properties considering no CO2(sc) injection, CO2(sc) injection, and alternating injection of water-CO2(sc) (AIWC) in granite at 150–300 ℃. The experiments can reveal the mechanical properties of HDR in single-phase CO2 zone, CO2-water two-phase zone and dissolved CO2 liquid phase zone in HDR reservoir. The results indicate that the failure mode of the rock samples primarily exhibits sudden instability after no CO2(sc) injection and AIWC, whereas it predominantly manifests progressive instability after CO2(sc) injection. Compared with 25 ℃, the uniaxial compressive strength (UCS) after no CO2(sc) injection at 150–300 ℃ decreased by 13.86%–32.92%. After CO2(sc) injection, the UCS decreased by 40.79%–59.60%. After AIWC, the UCS decreased by 27.74–40.48%. This shows that the strength of rock mass in the single-phase CO2 zone is lower than that in the other two zones, and this weakening phenomenon increases with the increase of temperature difference. At the same temperature, the elasticity modulus after AIWC was greater than that after no CO2(sc) injection and CO2(sc) injection. With no CO2(sc) injection, when the temperature was increased to 200 ℃ and 300 ℃, intergranular cracks and transgranular appeared respectively. After AIWC, mineral crystals such as calcite were precipitated on the surfaces of the connected large cracks, accompanied by kaolinite clay minerals. This increases the frictional contact of the mineral particles and enhances the stability of the HDR reservoir.

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来源期刊
Geothermal Energy
Geothermal Energy Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
5.90
自引率
7.10%
发文量
25
审稿时长
8 weeks
期刊介绍: Geothermal Energy is a peer-reviewed fully open access journal published under the SpringerOpen brand. It focuses on fundamental and applied research needed to deploy technologies for developing and integrating geothermal energy as one key element in the future energy portfolio. Contributions include geological, geophysical, and geochemical studies; exploration of geothermal fields; reservoir characterization and modeling; development of productivity-enhancing methods; and approaches to achieve robust and economic plant operation. Geothermal Energy serves to examine the interaction of individual system components while taking the whole process into account, from the development of the reservoir to the economic provision of geothermal energy.
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