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Physical properties of G-class cement for geothermal well cementing in South Korea

Author

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  • Won, Jongmuk
  • Lee, Dongseop
  • Na, Kyunguk
  • Lee, In-Mo
  • Choi, Hangseok

Abstract

The cement material adopted for a new geothermal well project in South Korea is specialized as the G-class cement, which is commonly used in the oil-well industry, and regulated by the API (American Petroleum Institute). In order to maintain the optimal generating performance of geothermal wells, physical properties of the cementing material should be satisfactory. In this paper, the significant material properties (i.e., groutability, uniaxial compressive strength, thermal conductivity, bleeding potential, phenolphthalein indication) of the G-class cement were experimentally examined, with consideration of various water–cement (w/c) ratios as mix proportion. Important findings through the experiments are as follows; (1) Groutability of the G-class cement increases with the addition of a small amount of retarder. (2) There would be a structural problem when the w/c ratio is kept extremely high in order to obtain acceptable groutability. (3) Thermal conductivity of the G-class cement is small enough to prevent heat loss during circulating up hot steam or water from the deep underground to the ground surface. (4) The G-class cement used for geothermal-well cementing causes no bleeding problem. (5) The phenolphthalein indicator is applicable to distinguishing the G-class cement from the drilling mud.

Suggested Citation

  • Won, Jongmuk & Lee, Dongseop & Na, Kyunguk & Lee, In-Mo & Choi, Hangseok, 2015. "Physical properties of G-class cement for geothermal well cementing in South Korea," Renewable Energy, Elsevier, vol. 80(C), pages 123-131.
    • Handle: RePEc:eee:renene:v:80:y:2015:i:c:p:123-131
    DOI: 10.1016/j.renene.2015.01.067
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    References listed on IDEAS

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    1. Kestin, J. & Wakeham, W.A., 1978. "A contribution to the theory of the transient hot-wire technique for thermal conductivity measurements," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 92(1), pages 102-116.
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    Cited by:

    1. Catalin Teodoriu & Mi Chin Yi & Saeed Salehi, 2019. "A Novel Experimental Investigation of Cement Mechanical Properties with Application to Geothermal Wells," Energies, MDPI, vol. 12(18), pages 1-14, September.
    2. Adonis Ichim & Catalin Teodoriu & Gioia Falcone, 2018. "Estimation of Cement Thermal Properties through the Three-Phase Model with Application to Geothermal Wells," Energies, MDPI, vol. 11(10), pages 1-12, October.
    3. Jongmuk Won & Hyun-Jun Choi & Hyobum Lee & Hangseok Choi, 2016. "Numerical Investigation on the Effect of Cementing Properties on the Thermal and Mechanical Stability of Geothermal Wells," Energies, MDPI, vol. 9(12), pages 1-13, December.

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