Scholarlink

<p>A series of laboratory experiments were carried out to examine the water permeability and swelling characteristics of a clay-rich rock, Callovo-Oxfordian (COx) claystone sourced from Bure, France. This paper presents a comprehensive analysis of unpublished experimental data collected over more than 4&#xa0;years. The intact sample water permeability was investigated through classic steady-state tests. Self-sealing tests were done under low-confinement conditions on macro-cracked samples. Finally, swelling tests were carried out to examine the swelling behavior of the claystone matrix and the effect of micro-cracking. Classic steady-state test results showed the water permeability of intact samples varies between 10<sup>–21</sup> and 10<sup>–20</sup> m<sup>2</sup>. The water permeability decreased with the effective stress, as the effect of injection pressure variation plays a more significant role on permeability decrease than confining pressure changes. Self-sealing tests demonstrated that ‘self-sealed’ water permeability can be close to intact values, indicating excellent sealing capacity in water transport. Swelling tests revealed that the COx claystone matrix swelling primarily depends on smectite content, while micro-cracking leads to larger swelling amplitude and faster kinetics.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Water Permeability and Swelling Characteristics of Callovo-Oxfordian Claystone: Summary of Laboratory Studies on Intact and Cracked Samples

  • 期刊论文

  • 发表日期：

    2024年12月31日

查看全文
  • Chuanrui Wang,
  • Yang Song,
  • Matthieu Briffaut,
  • Jean Talandier,
  • Frédéric Skoczylas

摘要

A series of laboratory experiments were carried out to examine the water permeability and swelling characteristics of a clay-rich rock, Callovo-Oxfordian (COx) claystone sourced from Bure, France. This paper presents a comprehensive analysis of unpublished experimental data collected over more than 4 years. The intact sample water permeability was investigated through classic steady-state tests. Self-sealing tests were done under low-confinement conditions on macro-cracked samples. Finally, swelling tests were carried out to examine the swelling behavior of the claystone matrix and the effect of micro-cracking. Classic steady-state test results showed the water permeability of intact samples varies between 10–21 and 10–20 m2. The water permeability decreased with the effective stress, as the effect of injection pressure variation plays a more significant role on permeability decrease than confining pressure changes. Self-sealing tests demonstrated that ‘self-sealed’ water permeability can be close to intact values, indicating excellent sealing capacity in water transport. Swelling tests revealed that the COx claystone matrix swelling primarily depends on smectite content, while micro-cracking leads to larger swelling amplitude and faster kinetics.