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Energies 2016, 9(12), 1016; doi:10.3390/en9121016

Numerical Investigation on the Effect of Cementing Properties on the Thermal and Mechanical Stability of Geothermal Wells

1
School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
2
School of Civil, Environmental, & Architectural Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 02841, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Jacek Majorowicz
Received: 9 August 2016 / Revised: 22 November 2016 / Accepted: 22 November 2016 / Published: 2 December 2016
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Abstract

In this paper, a two-dimensional (2-D) Finite Element (FE) analysis of a geothermal well was performed with respect to five different cross-sections corresponding to the design specifications for the geothermal well that is currently constructed in Pohang, South Korea. Among the essential components (such as ground formation, casing, and cementing) of a geothermal well, the thermal and mechanical stability of the cementing component was discussed based on a series of parametric studies with consideration of the thermal conductivity and Young’s modulus of the cementing component. With increasing number of casing layers, the cementing component experiences less stress concentration. In addition, the lower thermal conductivity of the cementing material is advantageous for effectively controlling radial displacement. Consequently, it should be noted in geothermal well cementing construction that long-term strength degradation of the cementing might cause the severe structural instability of an entire geothermal well. View Full-Text
Keywords: geothermal well cementing; G-class cement; numerical analysis; thermal conductivity; Young’s modulus geothermal well cementing; G-class cement; numerical analysis; thermal conductivity; Young’s modulus
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MDPI and ACS Style

Won, J.; Choi, H.-J.; Lee, H.; Choi, H. Numerical Investigation on the Effect of Cementing Properties on the Thermal and Mechanical Stability of Geothermal Wells. Energies 2016, 9, 1016.

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