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Yuko Suto

Section

Graduate School of Engineering

Job title

Associate Professor

Degree

博士（工学）（東北大学）
修士（工学）（東北大学）

researchmap

https://researchmap.jp/read0055325

J-GLOBAL ID

200901044233609647

Professional Memberships 4

日本工学教育協会
組織学会
石油技術協会
日本地熱学会

Research Areas 1

Energy / Earth resource engineering, energy science / 掘削工学

Papers 42

あらためて21世紀のテクノロジーの役割を考える

石田秀輝, 古川柳蔵, 須藤祐子

PEN(Public Engagement with Nano-based Emerging Technologies) Newsletter　4　(12)　3-13　2014/03
Nature Technology for the Creation of Innovative Life Peer-reviewed

Emile H. Ishida, Hirotaka Maeda, Ryuzo Furukawa, Yuko Suto

Handbook of Advanced Ceramics: Materials, Applications, Processing, and Properties: Second Edition　1189-1202　2013/05/01
Publisher: Elsevier Inc.
DOI： 10.1016/B978-0-12-385469-8.00062-9 　
Effect of the load condition on frictional heat generation and temperature increase within a tri-cone bit during high-temperature formation drilling Peer-reviewed

Yuko Suto, Hiroshi Takahashi

GEOTHERMICS　40　(4)　267-274　2011/12

DOI： 10.1016/j.geothermics.2011.08.004 　

ISSN： 0375-6505
Breaking A Way from Underground Resources and Energies Based Civilization - The Birth of Innovative Life Styles and Technologies -

Emile H. Ishida, Ryuzo Furukawa, Yuko Suto

空気調和・衛生工学　85　777-784　2011/09
Study on Development of Small Diameter Drilling Machine for Geo-Environmental Investigation Peer-reviewed

Akito Morita, Hiroshi Takahashi, Yuko Suto, Tomoaki Satomi

Proc. of the International Symposium on Earth Science and Technology 2010　209-214　2010/12
DEM Simulation on Strength and Deformation Characteristics of Ground Materials Peer-reviewed

Naoki Konda, Hiroshi Takahashi, Yuko Suto, Tomoaki Satomi

Proc. of the 5th International Symposium on Advanced Science and Technology in Experimental Mechanics　CD-ROM　2010/11
Evaluation of performance of lightweight aggregate from dehydration cake with waste materials

Y.Suto, H.Takahashi

Proceedings of the 10th International Symposium on East Asian Resources Recycling Technology　2009/11
Development of three-layer model and numerical simulation for cuttings transport in horizontal foam drilling. Peer-reviewed

Gumati Amna, Takahashi Hiroshi, Suto Yuko

Japanese Journal of Multiphase Flow　22　374-384　2008/12

DOI： 10.3811/jjmf.22.374 　
Study on producing lightweight aggregate from dehydration cake with waste materials Peer-reviewed

Yuko Suto, Hiroshi Takahashi

Proceedings of International Symposium on Earth Science and Technology　195-200　2008/12
Temperature memory gauge survey and estimation of formation temperature of the USDP-4 conduit hole at Unzen Volcano, Japan Peer-reviewed

Yuko Suto, Sumio Sakuma, Hiroshi Takahashi, Nobuo Hatakeyama, Joseph Henfling

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH　175　(1-2)　20-27　2008/07

DOI： 10.1016/j.jvolgeores.2008.03.034 　

ISSN： 0377-0273
Sustainable hydrogen production system with sulfur-water-organic materials by hydrothermal reaction Peer-reviewed

Noriyoshi Tsuchiya, Yuko Suto, Tomoyuki Kabuta, Shu Morikawa, Shigeko Yokoyama

JOURNAL OF MATERIALS SCIENCE　43　(7)　2115-2122　2008/04

DOI： 10.1007/s10853-007-2007-x 　

ISSN： 0022-2461
Laboratory experiments and thermal calculations for the development of a next-generation glacier-ice exploration system: Development of an electro-thermal drilling device Peer-reviewed

Yuko Suto, Sosuke Saito, Ken-ichi Osada, Hiroshi Takahashi, Hideaki Motoyama, Yoshiyuki Fujii, Yoichi Tanaka

Polar Science　2　(1)　15-26　2008/03

DOI： 10.1016/j.polar.2008.02.002 　

ISSN： 1873-9652
Experimental study on initial behavior of water-rock interaction in CO2-added hydrothermal system

Y. Suto, H. Takahashi, N. Tsuchiya

WATER DYNAMICS　987　66-69　2008

DOI： 10.1063/1.2896981 　

ISSN： 0094-243X
Fundamental Study on Cuttings Transport by Foam in Horizontal Wells Peer-reviewed

H.Takahashi, A.G.Abdusalam, Y.Suto

Proceedings of 2nd International Symposium on Advanced Fluid/Solid Science and Technology in Experimental Mechanics　CD-ROM　2007/09
Hydrothermal reactions of Sulfur-Organic Materials for Advanced Direct Use of Geothermal Energy as Sustainable Hydrogen Production System Invited Peer-reviewed

N. Tsuchiya, Y. Suto, S. Morikawa, T. Kabuta, S. Yokkoyama

Renewable Energy Proceedings 2006　2007/03
Initial behavior of granite in response to injection of CO2-saturated fluid Peer-reviewed

Yuko Suto, Lihui Liu, Nakamichi Yamasaki, Toshlyuki Hashida

APPLIED GEOCHEMISTRY　22　(1)　202-218　2007/01

DOI： 10.1016/j.apgeochem.2006.09.005 　

ISSN： 0883-2927
Dissolution and deposition behavior of granite and calc-silicate rock in CO2-saturated hydrothermal system Peer-reviewed

Y. Suto, N. Tsuchiya, T. Hashida

WATER-ROCK INTERACTION, VOLS 1 AND 2, PROCEEDINGS　12　647-651　2007
Fundamental Study on Continuous Recovery System for Soft Sludge Generated at Disaster Site Peer-reviewed

H.Takahashi, K.Takahashi, Y.Suto

Proceedings of the 3rd Symposium on Sediment-Related Disasters　1　25-30　2006
Measurement of heat generation in drill bits under simulated drilling conditions and estimation of temperatures in drill bits during drilling Peer-reviewed

Yuko Suto, Kazuhito Yoshimoto, Hiroshi Takahashi

Journal of the Japanese Association for Petroleum Technology　71　(1)　123-130　2006/01
Publisher:
DOI： 10.3720/japt.71.123 　

ISSN： 0370-9868
Study on Recycling of Dehydration Cake Produced from Crushed Rock Quarries Peer-reviewed

H.Takahashi, K.Yoshimoto, Y.Suto

Proc. of 3rd International Workshop on Earth Science and Technology　1　81-88　2005/12
Study on Recycling of Wasted Soils and Paper Sludge: Application of Paper Sludge to Soil Improvement Peer-reviewed

H.Takahashi, M.Doi, M.Mori, Y.Suto

Proc. of 3rd International Workshop on Earth Science and Technology　1　177-185　2005/12
Self-Oxidation and Reduction Reaction of Sulfur in Seawater for Georeactor and Hydrogen Generation Peer-reviewed

Kabuta, T, Y. Suto, N. Tsuchiya

Geothermal Resources Council Transactions　29　747-750　2005/09
Temperature Memory Gauge Survey and Borehole Temperature Simulation while the Conduit Well (USDP-4) Drilling

Y.Suto, H.Takahashi, N.Hatakeyama, J.Henfling

UNZEN Workshop 2005, International Workshop on Unzen Scientific Drilling Project (USDP)　11-12　2005/02
Study on the Breaking Performance of Excavated Soil Recycling Machine for Viscos Clay

H.Takahashi, M.Doi, Y.Suto, H.Hashimoto

Proc. of the 2nd Organized Terramechanics Workshop in Sendai　1　13-20　2004/11
Study on non-Diffusion Drilling Machine in the Sludge

H.Takahashi, Y.Harada, Y.Suto

Proc. of the 2nd Organized Terramechanics Workshop in Sendai　1　21-24　2004/11
Fundamental Study on Small Diameter Autonomous Excavating Machine of Soils

H.Takahashi, T.Sameshima, Y.Suto

Proc. of the 2nd Organized Terramechanics Workshop in Sendai　1　27-30　2004/11
Fundamental Study on Electrical Thermal Melt-Drilling Device for a Next Generation Type Drilling Exploration System for Glacier Ice

Y.Suto, S.Saito, H.Takahashi

Proc. of the 2nd Organized Terramechanics Workshop in Sendai　1　55-58　2004/11
Estimation of exposed temperature history of bit and bit performance while drilling high-temperature oil wells Peer-reviewed

Y.Suto, S.Yamazaki, S.Saito, N.Hatakeyama, H.Takahashi

Journal of the Japanese Association for Petroleum Technology　69　(4)　395-403　2004/07
Publisher:
DOI： 10.3720/japt.69.395 　

ISSN： 0370-9868
A consideration on the durability of fiber-cement-stabilized mud produced from construction sludge Peer-reviewed

H Takahashi, E Maruhashi, Y Suto, M Mori, K Kumakura, M Ohtani, T Ishii

X-RAY CT FOR GEOMATERIALS SOILS, CONCRETE, ROCKS　193-198　2004
Hydrothermal Reaction Processes of Sulfur Reduction for Designing Georeactor Peer-reviewed

Yuko Suto, Yugo Takano, Tomoyuki Kabuta, Noriyoshi Tsuchiya, Katsuto Nakatsuka

Proceedings of 7th International Symposium of Hydrothermal Reaction　523-529　2003/12
Georeactor: Advanced Geothermal Energy Utilization for Material Processing and Hydrogen Generation Peer-reviewed

N.Tsuchiya, Y.Suto, K.Nakatsuka

Geothermal Resources Council Transactions　27　111-114　2003/10
Advantages of Using Top-Drive-System for High Temperature Geothermal Well Drilling Peer-reviewed

S.Saito, K.Kitao, K.Saeki, Y.Suto

Geothermal Resources Council Transactions　27　183-187　2003/10
CO2 injection to granite and sandstone in experimental rock/hot water systems Peer-reviewed

Lihui Liu, Yuko Suto, Greg Bignall, Nakamichi Yamasaki, Toshiyuki Hashida

Energy Conversion and Management　44　(9)　1399-1410　2003/06

DOI： 10.1016/S0196-8904(02)00160-7 　

ISSN： 0196-8904
Mathematical Modelling of the Heat Transfer Between the well and Surrounding Rocks Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida, Seiji Saito, Yuko Suto

Proceedings of The 6th ASME-JSME Thermal Engineering Joint Conference　TED-AJ03-203　(6)　230-230　2003/03
Publisher:

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Assessment of the heat either delivered from the high temperature rocks to the borehole or transmitted to the formation from the circulating fluid is of crucial importance for a number of technological processes related to borehole drilling or exploitation. Normally the temperature fields in the well and surrounding rocks are calculated numerically by the finite difference method or analytically, applying the Laplace-transform method. The obtained formulae are rather bulky and require tedious non-trivial numerical evaluations. Moreover, in the publications where the solution is obtained analytically heat interactions of circulating fluid and with formation was treated under condition of constant bore-face temperature. In the present study the temperature field in the formation disturbed by the heat flow from the borehole is modeled by the heat conduction equation and thermal interaction of the circulating fluid with formation is approximated by the Newton relationship on the bore-face. The problem is solved analytically by the heat balance integral method, where the radius of thermal influence, which defines the thermally disturbed domain, is function of time that can be found from the algebraic equation. Within this method the approximate solution of the heat conduction problem is sought in the form of a finite sum of functions which belong to a complete set of the linearly independent functions defined on the finite interval bounded by the radius of thermal influence and satisfy the homogeneous boundary condition on the bore-face. It can be proved theoretically that the approximate solution found by this method converges to the exact one. In the present study the first and the second order approximations are obtained. Numerical results illustrates that second approximation is in a quite good agreement with the exact solution. The only one shortcoming of this solution is that it depends on the radius of thermal influence, which is the implicit function or time determined by the algebraic equation. In order to eliminate this complication, in this study on the basis of the approximate solution the new approximate formulae for the radius of thermal influence, which asymptotically coincides with the implicit one, is proposed as l(Fo)≈1+A(Bi)√<Fo>, where Bi=h_wr_w/k_S, Fo=τD_S/(r_w)^2,τ is time D_S is heat diffusivity of the formation, r_w is radius of the borehole, k_S is heat conductivity of the formation, h_w is heat transfer coefficient on the bore-face. The behavior of parameter A versus Bi is found comparing the approximate solution with the exact one and employing the non-linear regression method. The latter leads to A(Bi)=(2.084+0.704Bi)/(1.554+0.407Bi). For the constant temperature on the bore-face the heat flux on the bore-face can be computed with an approximate formula q^^&acd;(Fo)≈1/{1+Biln[1+A(Bi)√<Fo>]}. The correctness of this approximate solution is validated by comparison with an exact analytical solution found by Carslaw and Jaeger. Due to the Duhamel theorem for the arbitrary temperature on the bore-face the heat flux and bore-face temperature can be presented respectively as q_w=T_L(z, Fo)+∫^^<Fo>__0T_L(z, p)∂/(∂Fo)q^^&acd;(Fo-p)dp and T|_<r=1>=-∫^^<Fo>__0T_L(z, p)∂/(∂Fo)q^^&acd;(r, Fo-p)dp , where T_L(z, Fo) accounts for the thermal history of the formation temperature and possible axial (along the vertical axis z) variation of generally unsteady temperature in the borehole.
A Consideration on the Durability of Fiber-Cement-Stabilized Mud Produced from Construction Sludge Peer-reviewed

H.Takahashi, F.Maruhashi, Y.Suto, M.Mori, K.Kumakura, M.Ohtani, T.Ishii

Proceedings of International Workshop on X-ray CT for Geomaterials　1　175-180　2003
JUDGE Project as a Challenge of Geo-technology Peer-reviewed

T.Urabe, Y.Suto

土と基礎　51　1-4　2003
Heat flux on the bore-face and temperature distribution in the formation Peer-reviewed

S.Fomin, V.Chugunov, T.Hashida, S.Saito, Y.Suto

Geothermal Resources Council Transactions　26　803-807　2002
Dependence of the Rate of Granite Dissolution on Temperature and Fluid Velocity under Simulated Geothermal Reservoir Environments Peer-reviewed

Yuko Suto, Koji Tanifuji, Toshiyuki Hashida, Tetsuo Shoji, Hideaki Takahashi, Kimio Watanabe

Journal of the Geothermal Research Society of Japan　24　(1)　47-56　2002

DOI： 10.11367/grsj1979.24.47 　

ISSN： 1883-5775 0388-6735
Fundamental Research for CO₂ Injection into Granite and Sandstone, in Experimental Hot Water Systems Peer-reviewed

L. Liu, Y. Suto, G. Bignall, N. Yamasaki, T. Hashida

Proceedings of the 23rd New Zealand Geothermal Workshop, (November 7-9, 2001, The University of Auckland, New Zealand)　21-26　2001/11
Measurement of CO2 Solubility in Simulated Underground Water at Depth for the Carbon Dioxide Sequestration. Peer-reviewed

Suto Yuko, Liu Lihui, Hashida Toshiyuki, Yamasaki Nakamichi

Proceedings of Joint Sixth International Symposium on Hydrothermal Reactions & Fourth International Conference on Solvo-Thermal Reactions　309-312　2001/05
Experimental study of rock/water/CO2 interaction at temperatures of 100-350 degrees C Peer-reviewed

Y Suto, L Liu, T Hashida, N Tsuchiya, N Yamasaki

WATER-ROCK INTERACTION, VOLS 1 AND 2　1　341-344　2001
Effects of CO2 on Water/Rock Chemical Interactions in Geothermal Reservoir Environment. Peer-reviewed

Y.Suto, Y.Yamasaki, T.Hashida, N.Yamasaki

Proceedings of World Geothermal Congress 2000　CD-ROM　3901-3906　2000/05/28

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Misc. 6

土質改良機を用いた生石灰攪拌混合による揮発性有機化合物汚染土壌の最適浄化システムに関する研究

高橋弘, 三浦洋輔, 須藤祐子, 橋本久儀

春季大会講演集. I, 資源編　19　(1)　149-150　2007/03/29

ISSN： 1343-9898
海水における硫黄の自己酸化還元反応

株田知到, 須藤祐子, 土屋範芳

春季大会講演集. I, 資源編　17　(2)　45-46　2005/03/28

ISSN： 1343-9898
非拡散型高含水比泥土回収・脱水装置の開発に関する研究

高橋弘, 原田幸宏, 須藤祐子

春季大会講演集. I, 資源編　17　(1)　13-14　2005/03/28

ISSN： 1343-9898
Heat Generation in Drill Bits under Simulated Drilling Conditions and Effects of Cooling by Fluid Circulation

SUTO Y., YOSHIMOTO K., TAKAHASHI H.

2004　A36　2004/11/20
Self oxidation and reduction reactions of sulfur and hydrogen conversion by geothermal utilization

KABUTA T., SUTO Y., TSUCHIYA N.

2003　P19　2003/11/20
The Effect of Temperature and Surface Velocity on Water/Rock Interaction Under Reservoir Condition

TANIFUJI K., SUDO Y., WATANABE K., HASHIDA T.

19　(2)　140-140　1997/04/25

ISSN： 0388-6735

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Books and Other Publications 1

Lifestyle and Nature - Integrating Nature Technology to Sustainable Lifestyles -

Ryuzo Furukawa

Pan Stanford Publishing Pte. Ltd.　2019

Presentations 6

雲仙科学調査井でのメモリーゲージを使用した掘削中の坑内温度測定

刀根昭芳, 齋藤清次, Joseph Henfling

石油技術協会平成15年度春季講演会　2003/06/22
「西頚城」井掘削時の坑内温度シミュレーションとビット内O-リングの損傷に関する研究

山崎俊輔, 畠山信夫, 齋藤清次

日本地熱学会平成14年度学術講演会　2002/11/20
Experimental Study of Rock/Water/CO2 Interaction at Temperatures of 100 – 350℃ International-presentation

Lihui Liu, Toshiyuki Hashida, Noriyoshi Tsuchiya, Nakamichi Yamasaki

10th Int. Water Rock Interaction Symp.　2001/06/10
Measurement of CO2 Solubility in Simulated Underground Water at Depth for the Carbon Dioxide Sequestration International-presentation

Liu Lihui, Hashida Toshiyuki, Yamasaki Nakamichi

Joint 6th Int. Symp. Hydrothermal Reactions & 4th Int. Conf. Solvo-Thermal Reactions　2000/07/25
Effects of CO2 on Water/Rock Chemical Interactions in Geothermal Reservoir Environment International-presentation

Yuki Yamasaki, Toshiyuki Hashida, Nakamichi Yamasaki

World Geothermal Congress 2000　2000/05/28
地熱環境下における岩石／熱水相互作用の温度・流速依存性

谷藤浩二, 渡辺公雄, 橋田俊之

資源・素材学会東北支部平成11年度秋季大会　1999/11/16

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Research Projects 12

高温度地層の掘削効率向上に関する研究 Competitive

System: The Other Research Programs

2002/04 - Present
Development and effect studies of educational program based financial statements to enhance the creativity for the undergraduate and graduate students in engineering

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2019/04/01 - 2023/03/31
Technology creation system which can make with a paradigm shift of the human being and the earth by social implicating

Ishida Hideki, Yuko Suto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Tohoku University

2012/06/28 - 2017/03/31

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For the ubiquitous approach to the creation of technology from the lifestyle by backcast thinking was discussed. And the technology creation system which can make with a paradigm shift of the human being and the earth considering technology was superstructed by three steps. Firstly, derive the “technology elements for future” by resolving the expected lifestyle under the sustainable society to the action and the function through ontological engineering approach. Secondly, orchestrate the databases relating the amelioration/pejoration, fundamentals of the TRIZ 40, patents of the biomimetics. And finally, integrate the orchestrated database which has the information of subceller size materials and the lifestyle which is the required one in the sustainable society.
Study on Development of non-cohesive material based on the structure of insect cuticle and its application for heavy machines

TAKAHASHI Hiroshi, ISHIDA Hideki, SUTO Yuko

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2010 - 2012

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Roughness and contact angle were measured for several metal materials with various surface roughness and some insects such as beetles, lethocerus deyrollei, diving beetle were measured. Moreover, a device to measure the adhesion rate of soils were manufactured and the adhesion rate of soils was measured. In a result, it was found that the peak parameter which is the representative parameter in the vertical direction of roughness is a key factor, and the adhesion rate of soils increased with increasing this peak parameter.
Development of low cost quake-resistive ground materials by integrating several wastes and its application for Environmental Restoration

TAKAHASHI Hiroshi, FUKAGAWA Ryoichi, SUTO Yuko

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2010 - 2012

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It was confirmed that rice straw crushed by the mixer with wet condition can be used as a substitute of paper debris. Fiber-cement-stabilized soils were made by using the crushed rice straw and cyclic test for drying and wetting and submerged jet erosion test were carried out by using Fiber-cement-stabilized soils with crushed rice straw. In a result, it was found through these tests that Fiber-cement-stabilized soils have high durability for drying and wetting and high durability for erosion. Furthermore, a simulation model to estimate the strength characteristics of Fiber-cement-stabilized soils.
サスティナブル社会の実現のためのウェアラブル電源の提案

坂口清敏, 木崎彰久, 須藤祐子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 挑戦的萌芽研究

Institution: 東北大学

2009 - 2010

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本研究では,身に付けて発電できるウェアラブル電源(発電機)の実用化と普及に向けての基礎データを提供することを目的としている。本年度は,Phase2:各発電システムにおける最も効率的かつ効果的な発電スタイルの提案とPhase3:ウェアラブル電源のビジネスモデル構築のための基礎資料の提示と発電機の試作を目指した。成果をまとめると以下の通りである。 (1)ウェアラブル発電機としては,人の歩行を利用する「靴型ジェネレータ」が最も有望であることを明らかにした。(2)ベーンモータの理論やベーンポンプに理論を組み合わせた靴型ジェネレータに適したベーンタービン理論を構築した。(3)構築した理論に基づき,2種類のベーンタービン(statorの形状が偏心型:1機,長円型:2機)の設計・製作を行った。(4)製作したベーンタービンの性能を評価するために,回転性能試験と発電量測定試験を行った。(5)タービンの回転数は,偏心型ベーンタービンの方が大きかった。(6)長円型ベーンタービンの流入流出に使われていないポートを管路で繋げることにより回転数が増加した。これは,流出入のないポートを繋げることで,繋がった2つのポート間で循環が起こり,流量が仮想的に増大したためであることを明らかにした。(7)偏心型ベーンタービンへ圧力0.39MPa,流量4.1L/minで流体を供給した場合,得られた発電量は最大で95mWであった。この時の発電効率は0.036%と小さいものであったが,これは,ベーンタービンに連結したモータがベーンタービンの回転特性と合致していなかったためであることが分かった。(8)本年度の研究成果を総合的に検証し,実用機の実現のための課題として,チャンバーの最適な材質の決定,ベーンタービンの小型化,タンク形状の最適化,逆止弁の改良,ステータ形状の最適化,最適なモータの選定,ベーンタービンのトルク-回転特性の把握,出力電力の安定化などが必要であるとした。
Development of Eco-Friendly Functional Ground Materials by New Recycling Method for Unused High Water Content Mud

TAKAHASHI Hiroshi, FUKAGAWA Ryoichi, TATEYAMA Kazuyoshi, SUTO Yuko

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2007 - 2008
砕石脱水ケーキのリサイクル技術 Competitive

System: The Other Research Programs

2007/04 -
高効率な高温度地層掘削のための掘削条件-坑井内温度-ビット寿命の関係の定式化

須藤祐子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究(B)

Institution: 東北大学

2005 - 2006

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本研究では、高温度地層掘削におけるビット寿命低下の原因となる、ビット内部温度上昇によるベアリング部の損傷について、地層からの熱だけでなくベアリング部で機械的負荷により発生する摩擦熱も考慮し、掘削条件-坑内温度-ビット寿命の関係を検討した。そのために、1.様々な機械的負荷条件(荷重-回転数条件)におけるビット内部の発熱量とビット表面と内部との温度差の関係、2.坑内温度(坑底における循環泥水温度)とビット表面温度の関係、3.0リングシールが晒される温度・時間とベアリングの熱損傷の関係、4.実坑井におけるビットの被温度履歴とビット使用時間およびベアリング損傷度の関係を考慮した。 1.と2.については、掘削時ビット環境模擬装置を用いて、比較的高負荷の場合においても、ジャーナルベアリング型のトリコーンビット内部の発熱量および温度の測定試験を行った。掘削条件とベアリング内部と表面との温度差との関係を検討した結果、これまでの実験結果から予想していたような、荷重と回転数の上昇とともにビット内部温度も上昇するという単純なものではなく、ベアリング特性数で整理されるストライベック線図で考えると流体潤滑ではなく境界潤滑の状態にあることが示唆された。 3.については、NBR製および耐熱性がよいHNBR製のOリングシールを用いた熱劣化試験(グリース浸透)を行い、被熱後のOリングの引張試験を行った。その結果、それぞれの材質のOリングシールが使用不可能になる(弾性が著しく失われる)温度と時間の関係を明らかにした。また、実坑井にて使用されたビットから取り出したOリングシールについても引張試験を行い、ベアリングの熱損傷によるビット寿命と被熱温度・時間の関係を調査した。また、4.については、近年掘削された実坑井(高温度井)の掘削日報、掘削報告、検層結果などのデータを用いて、坑井掘削中の坑内温度を数値シミュレーションによって解析した。
Study on Recycling of unused high water-content mud as lightweight landfill materials

TAKAHASHI Hiroshi, INOUE Chihiro, SUTO Yuko, TATEYAMA Kazuyoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2004 - 2005

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1. Investigation on Fiber-cement-stabilized method (1), Several kinds of high water-content mud were sampled from several construction sites, and basic physical properties of the mud were investigated. Furthermore, optimum mixing rate of paper debris and chemical agents were examined. (2), Modified soils improved by the method proposed here were sampled from several locations of the mixing pool and the content of paper debris was measured by making the thin section. It was found that if the mixing and agitation was carried out fully and carefully, the unevenness of the paper debris was quite small. 2. Investigation on the durability of Fiber-cement-stabilized mud (1), It was confirmed through repeated cycle test for drying and wetting that the durability of the fiber-cement-stabilized mud was much higher than that of the cement-stabilized mud produced by the conventional method. (2), It was confirmed through repeated cycle test for freezing and thawing that the durability of the fiber-cement-stabilized mud was much higher than that of the cement-stabilized mud produced by the conventional method. 3. Study on utilization of the modified soils as lightweight landfill materials The theoretical equations to estimate the density and water content of the fiber-cement-stabilized mud were derived and the new recycling system was proposed. Furthermore, the trial calculation was carried out on the economic effect in the case that the fiber-cement-stabilized mud was used as landfill materials. In the result, it was confirmed that the reduction of the construction cost is possible. 4. Study on utilization of paper sludge The utilization of paper sludge as a substitute of paper debris was investigated. It was confirmed through the unconfined compression test and repeated cycle test for drying and wetting that the paper debris can be used as the substitute of paper debris. Moreover, it was confirmed that if the paper sludge is used instead of paper debris, large cost reduction is possible. 5. Estimation of the ability as vegetation soils The Fiber-cement-stabilized mud is lightweight, the utilization as vegetation soil on the rooftop will be possible. Therefore, water holding properties was examined. It was confirmed that the water holding properties of the fiber-cement-stabilized mud are much higher than the commercially produced artificial vegetation soils. Therefore, as the vegetation soils can be produced from the waste sludge, the construction cost of rooftop gardening is much reduced.
Development of a borehole temperature simulator to optimize operation of high-temperature well drilling

TAKAHASHI Hiroshi, HATAKEYAMA Nobuo, SUTO Yuko, NIIBORI Yuichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2002 - 2003

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In this research, a useful borehole simulator was developed to know borehole temperature and to select an optimum drilling condition while, drilling high-temperature formation. In addition, the adaptability of the simulator to high-temperature formation drilling was discussed, compared with field data. A special borehole simulator was developed. Using the simulator, you can simulate borehole condition corresponding to a series of work at drilling site. You can input various drilling parameters to the simulator, and can get the returned mud temperature, the bottomhole temperature, and so on. Some field data were selected to compare with simulated data. The field data were mud logging data, mud circulation test data and temperature recovery test data from a high-temperature oil well and a geothermal well. Results showed that simulated values relatively agreed with measured value from these test. This indicates that you can estimate borehole temperature to a certain extent while high temperature drilling. It was also suggested that properties of non-Newtonian fluid at high temperature was needed to be more clear in order to much accurate the simulator.
CO2地下処理のための岩石/熱水相互作用に関する研究 Competitive

System: The Other Research Programs

1998/04 -

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