Development of numerical simulator for predicting non-equilibrium steam-water flow behavior and its application to estimating steam-water relative permeability

Yuki Ishigami, Aminullah Sabawon, Masanori Kurihara

    研究成果: Conference contribution

    2 被引用数 (Scopus)

    抄録

    Geothermal power generation is one of the most noteworthy renewable energies because it can steadily generate electricity for 24 hours a day and for 365 days a year. Geothermal reservoirs generation, however, have a problem of steam shortage caused by excessive steam production and a large volume of recharge water injection is necessary. In order to develop the geothermal energy effectively, a simulation study is useful, which can predict the fluid flow behavior in a geothermal reservoir. The relative permeability, which is generally estimated based on experimental data, is a key data for the rigorous simulation. The steam-water relative permeability, however, is not straightforward to measure due to the complex phase change. In this research, therefore, it was attempted to develop a program to estimate the steam-water relative permeability numerically using a geothermal simulator as an engine of this program. First, in this study, we developed a two-component, two-phase simulator to predict the flow behavior of geothermal fluid considering the non-equilibrium state. We confirmed that the simulator worked accurately by comparing the basic (equilibrium) calculation results with those by STARS developed by Computer Modelling Group Ltd. in Canada. Then, using the simulator thus developed, the sensitivity of the geothermal reservoir performances, to the kinetic constants for mass transfer from water phase to steam phase and vice versa, was investigated. Finally, we developed a program to estimate the steam-water relative permeability based on the results of steam flooding experiment. This program optimizes the relative permeability so as to reproduce the core flooding experimental results using the simulator developed in the above, by means of the Iterative Latin Hypercube Sampling which is one of the non-gradient optimization methods. It was confirmed that this program could successfully optimize/estimate the steamwater relative permeability based on the hypothetical core flooding experimental data obtained numerically.

    本文言語English
    ホスト出版物のタイトルGeothermal Energy
    ホスト出版物のサブタイトルPower To Do More - Geothermal Resources Council 2017 Annual Meeting, GRC 2017
    出版社Geothermal Resources Council
    ページ2008-2037
    ページ数30
    41
    ISBN(電子版)0934412227
    出版ステータスPublished - 2017 1 1
    イベントGeothermal Resources Council 41st Annual Meeting - Geothermal Energy: Power To Do More, GRC 2017 - Salt Lake City, United States
    継続期間: 2017 10 12017 10 4

    Other

    OtherGeothermal Resources Council 41st Annual Meeting - Geothermal Energy: Power To Do More, GRC 2017
    国/地域United States
    CitySalt Lake City
    Period17/10/117/10/4

    ASJC Scopus subject areas

    • 再生可能エネルギー、持続可能性、環境
    • エネルギー工学および電力技術
    • 地球物理学

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