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- 伊藤 高敏
- 東北大学流体科学研究所
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- 渡邉 恒
- 東北大学流体科学研究所
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- SWENSON Daniel
- Mechanical and Nuclear Engineering Department, Kansas State University
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- 林 一夫
- 東北大学流体科学研究所
書誌事項
- タイトル別名
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- Thermoelastically-induced Fracture Permeability Enhancement Associated with Cold Fluid Injection and its Laboratory Verification
- テイオンスイ リュウニュウ ニ トモナウ ネツ ダンセイ コウカ ニ ヨル キレツ トウスイセイ ノ ヘンカ キョドウ ト シツナイ ジッケン ニ ヨル ケンショウ
この論文をさがす
説明
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 Tc. 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 Tc as theoretically predicted.
収録刊行物
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- 日本地熱学会誌
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日本地熱学会誌 27 (2), 101-113, 2005
日本地熱学会
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詳細情報 詳細情報について
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- CRID
- 1390282681104338048
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- NII論文ID
- 130003624351
- 10015696174
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- NII書誌ID
- AN00333995
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- ISSN
- 18835775
- 03886735
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- NDL書誌ID
- 7364134
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可