Effect of fluid leakage at the crack tip on dynamics of two-dimensional fluid-filled crack

Shin Ito, Kazuo Hayashi

Research output: Contribution to journalArticlepeer-review

Abstract

Dynamic response of a reservoir crack with fluid leakage at the crack tip is studied by using a two-dimensional fluid-filled crack in an elastic medium, i.e. a rock mass. We use Darcy's law for describing fluid leakage at the crack tip. It is revealed that the eigen angular frequencies become smaller with increasing fluid leakage at the crack tip. It is also revealed that attenuation becomes stronger with increasing fluid leakage. However, for fluid leakage exceeding a certain level, the situation is opposite, i.e., attenuation becomes weaker with increasing fluid leakage. These effects of fluid leakage on the eigen angular frequencies are stronger for the larger interfacial stiffness due to contact between the asperities on the upper and lower crack surfaces. They are also weaker for larger ratio of the crack length to the initial aperture of the crack.

Original languageEnglish
Pages (from-to)1661-1666
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume67
Issue number662
DOIs
Publication statusPublished - 2001

Keywords

  • Acoustic emission
  • Dynamic response
  • Elastic wave
  • Elasticity
  • Geothcrmal energy
  • Geothcrmal reservoir crack
  • Stress wave

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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