Michael A. Kant

ETH Zurich

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Philipp Rudolf von Rohr

ETH Zurich

Edoardo Rossi

ETH Zurich

Dragana Höser

ETH Zurich

Claudio Madonna

ETH Zurich

Martin O. Saar

ETH Zurich

Ph. Rudolf von Rohr

ETH Zurich

Jonas Duss

Kantar Health (Brazil)

Alexandra Pătru

Paul Scherrer Institute

Jens Ammann

IBM Research - Zurich

Thomas Meier

Shanghai Advanced Research Institute

Cooperative Institutions

ETH Zurich

École Polytechnique Fédérale de Lausanne

Institute of Process Engineering

Board of the Swiss Federal Institutes of Technology

RWTH Aachen University

Geological Institute

Kantar Health (Brazil)

Paul Scherrer Institute

Center of Research and Technologic Development in Electrochemistry

Réseau sur le Stockage Electrochimique de l'énergie

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An experimental study of the influence of uniaxial load on flame jet drilling

International Journal of Rock Mechanics and Mining Sciences (2018)

Dragana Höser Thomas Meier Alexandra Pătru Michael A. Kant Ph. Rudolf von Rohr

Uniaxial tension

10.1016/j.ijrmms.2018.04.007

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Thermal properties of Central Aare granite for temperatures up to 500°C: Irreversible changes due to thermal crack formation

Geophysical Research Letters (2017)

Michael A. Kant Jens Ammann Edoardo Rossi Claudio Madonna Dragana Höser

Abstract Thermal diffusivity, heat capacity, and thermal conductivity of Central Aare granite are reported in the temperature range from 25°C to 500°C. Each rock sample underwent three consecutive heating and cooling cycles. Significant irreversible changes in the properties due to thermal crack formation could be observed. After the first thermal cycle, both thermal diffusivity and conductivity dropped to about 75% of the initial value at room temperature, whereas the heat capacity did not show an irreversible decay. For subsequent thermal cycles, no further permanent changes of the investigated properties could be observed. From the conducted measurements, accurate correlations are derived, offering a platform for precise high‐temperature experiments and other research on Central Aare granite and similar granitic rocks. The report shows that the assumption of constant thermal properties leads to significant inaccuracies at elevated temperatures, especially if thermal cycles are present.

Atmospheric temperature range

10.1002/2016gl070990

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The Effects of High Heating Rate and High Temperature on the Rock Strength: Feasibility Study of a Thermally Assisted Drilling Method

Rock Mechanics and Rock Engineering (2018)

Edoardo Rossi Michael A. Kant Claudio Madonna Martin O. Saar Philipp Rudolf von Rohr

Hardening (computing)

10.1007/s00603-018-1507-0

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Minimal required boundary conditions for the thermal spallation process of granitic rocks

International Journal of Rock Mechanics and Mining Sciences (2016)

Michael A. Kant Philipp Rudolf von Rohr

Pyrometer

10.1016/j.ijrmms.2015.12.009

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A theory on thermal spalling of rocks with a focus on thermal spallation drilling

Journal of Geophysical Research Solid Earth (2017)

Michael A. Kant Edoardo Rossi Claudio Madonna Dragana Höser Philipp Rudolf von Rohr

Abstract Thermal cracking of rocks is an intensively studied topic in different research areas and for various engineering problems. In this context, we present a modeling approach which describes thermal spalling of rocks with a focus on thermal spallation drilling. This drilling technology uses high thermal loads to locally destruct the surface of the rock formation. With the presented model, the operating conditions which are required to initiate spalling of rocks can be estimated. Additionally, a Spallability number is introduced allowing a categorization of rocks according to their ability to spall. The presented model is based on linear fracture mechanics and the stress intensity concept. It evaluates if a crack with a certain geometry embedded in a rock with specific properties propagates during exposure to different heat loads and external pressures. Thereby, rapid heat transfer processes are coupled with induced thermal stresses and fracture mechanics in rocks.

Spall

10.1002/2016jb013800

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Demonstration of thermal borehole enlargement to facilitate controlled reservoir engineering for deep geothermal, oil or gas systems

Applied Energy (2018)

Michael A. Kant Edoardo Rossi Jonas Duss Florian Amann Martin O. Saar

Well stimulation

10.1016/j.apenergy.2018.01.009

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Citations (34)