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Thermoelastically-induced fracture permeability enhancement associated with cold fluid injection

Research Project

Project/Area Number 15560700
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Earth system and resources enginnering
Research InstitutionTohoku University

Principal Investigator

ITO Takatoshi  Tohoku University, Institute of Fluid Science, Associate Professor, 流体科学研究所, 助教授 (00184664)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2003: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsFracture / Permeability / Thermal deformation / Thermal stress / In-situ stress / Geothermal energy / Re-injection / 氷
Research Abstract

When cold fluid flows into fractures within a rock, the rock cools down and the cooling causes thermal contraction of the rock around the fractures. As a result, the fractures are likely to open and to be more permeable. We analyze the effect of remote compressive stresses on fracture opening associated with cold fluid flow by using a 2D FEM code. The results show that the fracture opening will be suppressed by remote compressive stresses, but even in such a condition, the considerable increase in fracture opening and permeability will appear when the temperature of injected fluid is smaller than a critical value T_c. This value is given as a function of remote compressive stresses, fracture pressure, and elastic properties of rock. In order to verify the theoretical prediction, we carried out laboratory experiments using a cylindrical specimen. There exists an artificial fracture passing through the specimen in the axial direction, and the experiments were proceeded as follows ; (i)apply a confining stress to the specimen, (ii)elevate the specimen's temperature to a certain level, (iii)inject cold water into the fracture by a constant pressure, and measure the injection rate, (iv) estimate the fracture permeability from the measured injection rate. From the results of experiments, we confirmed that the fracture permeability increases gradually with decreasing the injection temperature, and the increasing rate changes dramatically when the injection temperature becomes lower than the critical value T_c as theoretically predicted.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (12 results)

All 2005 2004 2003 Other

All Journal Article (10 results) Publications (2 results)

  • [Journal Article] Thermoelastically-induced fracture permeability enhancement associated with cold fluid iniection and its laboratory verification2005

    • Author(s)
      Ito, T., Watanabe, H., Swenson, D., Hayashi, K.
    • Journal Title

      J.Geotherm.Res.Soc.Japan

      Pages: 1-13

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 低温水流入に伴う熱弾性効果によるき裂透水性の変化挙動と室内実験による検証2005

    • Author(s)
      伊藤 高敏他2名
    • Journal Title

      日本地熱学会誌 27巻・2号(掲載予定)

    • NAID

      10015696174

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Utilization of ice as a rock-like material with transparency for physical experiment in laboratory2004

    • Author(s)
      Takatoshi Ito 他2名
    • Journal Title

      Proc.ISRM International Symposium, the 3rd Asian Rock Mechanics Symposium

      Pages: 173-178

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 低温水流入に伴う熱弾性効果によるき裂透水性変化挙動と室内実験による検証2004

    • Author(s)
      伊藤 高敏 他2名
    • Journal Title

      日本地熱学会誌 27

      Pages: 1-13

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Utilization of ice as a rock-like material with transparency for physical experiment in laboratory2004

    • Author(s)
      Ito, T., Abe, T., Hayashi, K.
    • Journal Title

      Proc.of the ISRM International Symposium, the 3rd Asian Rock Mechanics Symposium

      Pages: 173-178

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Utilization of Ice as a Rock-like Material with Transparency for Physical Experiment in Laboratory2004

    • Author(s)
      Takatoshi ITO他2名
    • Journal Title

      Proc.3rd Asian Rock Mech.Symp. Vol.1

      Pages: 173-178

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Effect of thermal deformation on fracture permeability in stressed rock masses2003

    • Author(s)
      Takatoshi Ito 他2名
    • Journal Title

      Proc.Int.Conf.on Coupled T-H-M-C Processes Geosystems : Fundamentals, Modeling, Experiments & Applications

      Pages: 671-676

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Numerical study on optimum injection temperature inferred from coupled-hydro-thermal-mechanical behavior of rock2003

    • Author(s)
      Takatoshi Ito 他3名
    • Journal Title

      Geothermal Resources Council Trans. 27

      Pages: 695-698

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of thermal deformation on fracture permeability in stressed rock masses2003

    • Author(s)
      Ito, T., Swenson, D., Hayashi, K.
    • Journal Title

      Proc.Int.Conf.on Coupled T-H-M-C Processes in Geosystemsb : Fundamentals, Modeling, Experiments & Applications (GeoProc 2003)

      Pages: 671-676

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Numerical study on optimum injection temperature inferred from coupled-hydro-thermal-mechanical behavior of rock2003

    • Author(s)
      Ito, T., Swenson, D., Sekine, K., Hayashi, K.
    • Journal Title

      Geothermal Resources Council Trans Vol.27

      Pages: 695-698

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 伊藤高敏 他2名: "温度変化による応力低下モデルに基づく葛根田地熱地域における注水データの解析"日本地熱学会25周年記念自然エネルギーフォーラム平成15年学術講演会講演要旨集. 63 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takatoshi ITO 他2名: "Utilization of Ice as a Rock-like Material with Transparency for Physical Experiment in Laboratory"Proc.3rd Asian Rock Mech.Symp.. (発売予定). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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