You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    Volume 38, Issue 1 (January 2015)

    Thermo-Triax: An Apparatus for Testing Petrophysical Properties of Rocks Under Simulated Geothermal Reservoir Conditions

    (Received 19 March 2014; accepted 26 September 2014)

    Published Online: 2014

    CODEN: GTJOAD

      Format Pages Price  
    PDF 20 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    A Thermo-Triax apparatus has been developed to facilitate research on petrophysical properties of rock samples under simulated geothermal reservoir conditions. The apparatus consists of control systems for vertical stress and horizontal confining pressure, a pair of independent pore pressure controllers for applying different upstream, and downstream pore pressures at bottom and top of rock specimens, an external heater and a data logging system. Permeability of rocks is measured using steady state and transient flow methods. The thermal expansion of metallic parts in the triaxial cell and the error introduced into the readings of the extensometers at high temperatures are calibrated via experiments on an aluminum specimen with known coefficient of thermal expansion. The possibilities of studying the effect of stress and temperature on permeability and compressibilities of porous rocks with the Thermo-Triax apparatus are presented with first data. The change of pore volume during the non-isothermal process between adjacent temperature levels as well as along the measurement of permeability at leveled temperatures is interpreted and calibrated. The thermal expansion of mineral grains during heating is verified with the data of pore volume change and the magnitude of thermal expansion of mineral grains is estimated and compared with reported values. The permeability measurements along different heating paths can be used to verify the temperature dependency of stress-dependent rock properties.


    Author Information:

    Pei, Liang
    Department of Geothermal Science and Technology, Technische Universität Darmstadt, Institute of Applied Geosciences, Darmstadt,

    Rühaak, Wolfram
    Graduate School of Energy Science and Engineering, Technische Universität Darmstadt, Darmstadt,

    Stegner, Johannes
    Graduate School of Energy Science and Engineering, Technische Universität Darmstadt, Darmstadt,

    Bär, Kristian
    Department of Geothermal Science and Technology, Technische Universität Darmstadt, Institute of Applied Geosciences, Darmstadt,

    Homuth, Sebastian
    Department of Geothermal Science and Technology, Technische Universität Darmstadt, Institute of Applied Geosciences, Darmstadt,

    Mielke, Philipp
    Department of Geothermal Science and Technology, Technische Universität Darmstadt, Institute of Applied Geosciences, Darmstadt,

    Sass, Ingo
    Department of Geothermal Science and Technology, Technische Universität Darmstadt, Institute of Applied Geosciences, Darmstadt,

    Graduate School of Energy Science and Engineering, Technische Universität Darmstadt, Darmstadt,


    Stock #: GTJ20140056

    ISSN: 0149-6115

    DOI: 10.1520/GTJ20140056

    Author
    Title Thermo-Triax: An Apparatus for Testing Petrophysical Properties of Rocks Under Simulated Geothermal Reservoir Conditions
    Symposium , 0000-00-00
    Committee E41