花岗岩在实时高温和真实三轴应力作用下的 Sc-CO2 断裂实验研究

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Yang Yang , Dawei Hu , Haizhu Wang , Yunteng Wang , Dianbin Guo , Hui Zhou
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引用次数: 0

摘要

Sc-CO压裂是一种潜在的干热岩激励方法。在不同温度和应力条件下,对花岗岩进行了一系列 Sc-CO 压裂实验。对注入压力曲线和裂缝进行了定量和定性分析,以解释高温和高应力条件下的 Sc-CO 压裂机理。在相同应力条件下,随着温度的升高,击穿压力降低。同时,样品表面的宏观裂缝体积和长度减小,而样品内部的微观裂缝体积增大。在相同的温度条件下,随着应力的增加,击穿压力也会增加。但在高温条件下,这种增加趋势并不明显。与水力压裂法相比,由于 CO 的密度和粘度较低,Sc-CO 压裂法从注入到击穿所需的时间较长,击穿压力也较低。高温对压裂的影响主要表现在产生微观热裂缝以及降低 Sc-CO 的粘度和密度。低粘度和低密度的 CO 更容易渗入样品的热裂缝中,产生弥散的微裂缝网络,导致孔隙压力增加,井筒附近的有效应力降低。因此,这些微裂缝会发生扩展,导致微裂缝体积增大,而大裂缝的体积和长度减小,最终导致击穿压力降低。高应力主要通过减小微观热裂纹的开口宽度来影响断裂过程。这种减少抑制了 Sc-CO 通过这些裂缝的扩散,最终导致击穿压力的增加。这项实验研究的结果为干热岩储层的高效压裂和裂缝形成提供了理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on Sc-CO2 fracturing of granite under real-time high temperature and true triaxial stress

Sc-CO2 fracturing would be a potential stimulation method for Hot Dry Rock. A series of Sc-CO2 fracturing experiments were performed on granite under different temperature and stress conditions. Quantitative and qualitative analysis of injection pressure curves and cracks were conducted to explain the Sc-CO2 fracturing mechanism under high temperature and high stress conditions. Under the same stress conditions, as the temperature increases, the breakdown pressure decreases. Concurrently, the volume and length of macro-cracks on the sample surface decrease, whereas the volume of micro-cracks within the sample increases. Under the same temperature conditions, as the stress increases, the breakdown pressure increases. However, this increasing trend is less noticeable at high temperatures. Compared with hydraulic fracturing, due to the lower density and viscosity of CO2, Sc-CO2 fracturing takes longer from injection to breakdown and has lower breakdown pressure. The effect of high temperature on fracturing mainly manifests in the generation of microscopic thermal cracks and a reduction in viscosity and density of Sc-CO2. Low viscosity and low density CO2 are more likely to penetrate into the thermal cracks of the sample, generating a diffuse micro-crack network, leading to an increase in pore pressure and a reduction in effective stress near the wellbore. Consequently, there is propagation of these micro-cracks, resulting in an increase in the volume of micro-cracks while the volume and length of macro-cracks decrease, ultimately leading to a decrease in breakdown pressure. High stress primarily influences the fracture process by reducing the opening width of microscopic thermal cracks. This reduction inhibits the diffusion of Sc-CO2 through these cracks, ultimately leads to an increase in breakdown pressure. The findings of this experimental study provide a theoretical basis for efficient fracturing and crack creation in hot dry rock reservoirs.

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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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