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Experimental study on microscopic characteristics of liquid-cooled granite based on mercury injection method

基于注汞法的液冷花岗岩微观特性实验研究

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Abstract

To study the effect of liquid cooling, including acid cooling and water cooling, on the microscopic characteristics of high-temperature granite, scanning electron microscopy and energy spectroscopy analysis tests (SEM-EDS) as well as mercury injection experiments were carried out on liquid-cooled granite. The SEM-EDS results show that the elemental composition is barely affected by water cooling, while acid cooling causes reductions in O, Si, and metallic elements. The pores and cracks were observed in both cases. Moreover, a more non-flat, loose, and rough surface is created under acid cooling conditions compared to water cooling. Mercury injection tests show an increase in porosity, pore volume, and specific surface area in liquid-cooled granite samples, while their fractal dimensions show an opposite trend. Acid cooling leads to significantly greater property changes than water cooling, owing to the dissolution effects of mud acid. The results demonstrate that the acid cooling process results in greater capacity of pore generation and expansion, as well as lower pore structure complexity, compared to water cooling.

摘要

在开采高温储层的过程中,微观特征变化重要影响深部热储层人工裂隙网络的建立。因此,研究该过程中微观特征的变化对深部地热能的安全高效开采具有重要意义。采用液体冷却(包括酸冷却和水冷却)处理高温花岗岩,模拟向高温储层注酸情况,以获取相应条件下的花岗岩试样。随后,使用扫描电子显微镜-能量散射谱(SEM-EDS)和高压注汞法对样品进行测试。SEM-EDS 结果显示,水冷却几乎不会影响元素的组成,酸冷却导致氧、硅和金属元素减少。在两种情况下,都观察到了孔隙和裂缝的形成。此外,与水冷却相比,酸冷却的样品表面更加不平整、疏松和粗糙。注汞法测试结果显示,随着处理温度的升高,液冷花岗岩样品的孔隙率、孔隙体积和比表面积有增加,但分形维数呈相反的趋势。研究结果表明,与水冷却相比,酸冷却条件对花岗岩的腐蚀作用使各项参数的变化更加显著,在酸冷却过程中产生更多的孔隙,提供更好的运输空间,使孔隙结构的复杂性降低。在高温储层的地热能有效提取方面,酸冷却具有更大应用潜力。

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Tu-bing Yin  (尹土兵), Ju-zhen Su  (苏巨振), Deng-deng Zhuang  (庄登登) & Xi-bing Li  (李夕兵)

  2. Oulu Mining School, University of Oulu, FI-90014, Oulu, Finland

    Deng-deng Zhuang  (庄登登)

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  1. Tu-bing Yin  (尹土兵)
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  2. Ju-zhen Su  (苏巨振)
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Contributions

YIN Tu-bing provided funding and resources. ZHUANG Deng-deng contributed to investigation, validation, formal analysis, writing-review and editing. SU Ju-zhen contributed in writing-original draft, methodology, and data organization. LI Xi-bing guided the whole process.

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Correspondence to Deng-deng Zhuang  (庄登登).

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YIN Tu-bing, SU Ju-zhen, ZHUANG Deng-deng and LI Xi-bing declare that they have no conflict of interest.

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Foundation item: Project(41972283) supported by the National Natural Science Foundation of China

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Yin, Tb., Su, Jz., Zhuang, Dd. et al. Experimental study on microscopic characteristics of liquid-cooled granite based on mercury injection method. J. Cent. South Univ. 31, 169–181 (2024). https://doi.org/10.1007/s11771-023-5481-7

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  • DOI: https://doi.org/10.1007/s11771-023-5481-7

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