Thermal Stability and Structural Characterization of Class G Oil Well Cement Paste Exposed to Elevated Temperature
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 11
Abstract
The primary objective of well cementing is zonal isolation, which needs to be met by an appropriate cementitious material that can withstand high temperature and pressures. In this paper, the thermal stability of class G oil well cement (G-OWC) paste is evaluated in terms of the change in compressive strength, volume, and microstructure after heat treatment. The results show that the thermal exposure up to 200°C did not have a significant effect on the strength and volume of the samples. The cement paste experienced substantial strength loss and shrinkage between 200 and 1,000°C. After heating up to 1,000°C, only 6.3% compressive strength was left for the sample. The drastic thermal damage is attributed primarily to the evaporation of chemical bound water and decomposition of hydration products in the cement paste as the temperature increases to 440°C. The transformation of C-S-H gel to larnite () after exposure to 650°C and the decarbonation of calcite after exposure to 850°C also induces degradation in the structure of G-OWC paste. This study indicates that the G-OWC may be used in the viscous crude oil cementing with service temperature below 200°C.
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Acknowledgments
This work was sponsored by the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20130428), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No.12KJB430014), the Project of Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province (Grant No. AE201113), and the Project Key Laboratory for Ecological-Environment Materials of Jiangsu Province (Grant No. EML201209).
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Mar 25, 2014
Accepted: Sep 12, 2014
Published online: Feb 20, 2015
Discussion open until: Jul 20, 2015
Published in print: Nov 1, 2015
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