理论与试验研究

地应力对高温高压CO2热冲击破岩的影响研究

  • 张琳 ,
  • 胡少斌 ,
  • 蔡余康 ,
  • 庞烁钢 ,
  • 颜正勇
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  • 河海大学 土木与交通学院,南京 210098
张琳(1998—),女,安徽合肥人,硕士,主要从事岩土工程、地下工程等领域的研究工作。E-mail:zhanglinhhu@126.com
胡少斌(1990—),男,江西南昌人,博士,副教授,主要从事岩土工程、地下工程等领域的教学与科研工作。E-mail:hsbhhu@126.com

收稿日期: 2024-03-15

  网络出版日期: 2025-01-03

基金资助

江苏省自然科学基金(BK20201313);湖北省重点实验室开放基金(HKLBEF202004)

Study on the Effect of In-situ Stress on Rock Breaking by High Temperature and High Pressure CO2 Thermal Shock

  • Zhang Lin ,
  • Hu Shaobin ,
  • Cai Yukang ,
  • Pang Shuogang ,
  • Yan Zhengyong
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  • College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, P. R. China

Received date: 2024-03-15

  Online published: 2025-01-03

摘要

针对深部储层压裂增渗难题,高温高压CO2热冲击致裂技术凭借其绿色低碳、破岩效率高和震动噪音低的特点,已展现出巨大的发展潜力。本文在考虑热源的燃烧、传热传质、瞬态非线性流动以及岩石损伤演化过程的基础上,通过归纳试验现象推导的基于浓度变化的释能方程定义热源功率,从而建立相应的高温高压CO2热冲击破岩数值模型,分析了地应力差和岩石围压对热冲击破岩裂隙扩展规律的影响,揭示了复杂裂缝形成机制。结果表明:高温高压CO2热冲击致裂过程主要由两个阶段组成,分别是超临界CO2冲击力作用下的动态致裂阶段和高能CO2气体驱动裂纹扩展的准静态阶段。初始地应力能够从一定程度上抑制冲击力作用下岩石内部径向裂隙的扩展,流体峰值压力和岩石起裂压力随着初始地应力差的增加呈现减小趋势,流体峰值压力随着岩石围压的增加而增大。

本文引用格式

张琳 , 胡少斌 , 蔡余康 , 庞烁钢 , 颜正勇 . 地应力对高温高压CO2热冲击破岩的影响研究[J]. 地下空间与工程学报, 2024 , 20(6) : 1818 -1829 . DOI: 10.20174/j.JUSE.2024.06.07

Abstract

In view of the problem of fracturing and increasing permeability in deep reservoirs, the high-temperature and high-pressure CO2 thermal shock fracturing technology has shown great development potential with its green and low carbon, high rock breaking efficiency and low vibration noise characteristics. On the basis of considering the combustion of heat source, heat and mass transfer, transient nonlinear flow and rock damage evolution process, the heat source power is defined by the energy release equation based on the concentration change derived from the experimental phenomena, so as to establish the corresponding numerical model of high-temperature and high-pressure CO2 thermal shock rock breaking, analyses the influence of rock confining pressure and in-situ stress difference field on the crack propagation law of thermal shock fracturing, and reveal the complex fracture formation mechanism. The results show that: The high-temperature and high-pressure CO2 thermal shock fracturing process is mainly composed of two stages, namely the dynamic fracturing stage under the action of supercritical CO2 impact force and the quasi-static stage of high-energy CO2 gas-driven fracture expansion. The initial in-situ stress can inhibit the expansion of radial fractures within the rock under the impact force to a certain extent. The peak fluid pressure and rock fracturing pressure tend to decrease with the increase of the initial in-situ stress difference, and the peak fluid pressure increases with the increase of rock confining pressure.

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