Potential utilization of class C fly ash-based geopolymer in oil well cementing operations |
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Affiliation: | 1. Civil and Environmental Engineering Department, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA;2. Schlumberger-Doll Research Center, 1 Hampshire St., Cambridge, MA 02139-1578, USA;3. Schlumberger Riboud Product Center, 1 rue Henri Becquerel, Clamart 92140, France |
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Abstract: | The early age compressive strength development of class C fly ash-based geopolymers under high pressure and high temperatures of curing is considered as an alternative to well cements. Uniaxial compressive strength (UCS) results show how the curing temperature affects the early compressive strength development. As the temperature rises from 87 to 125 °C, a consecutive reaction seems to take place at the higher concentrations of NaOH, which decrease the compressive strength at the higher temperature. The taken scanning electron microscope (SEM) images show a change in the morphology of the samples at 125 °C with the higher concentrations of NaOH. Ultrasonic cement analyzers (UCA) were employed to investigate the instantaneous strength development of the geopolymeric slurries. As the common cement models were not able to assess the compressive strength development, the custom algorithm option in the UCA software was applied. The developed empirical correlations were not able to accurately estimate the sonic strength of the slurries remarkably at 125 °C. The rheological measurements of the prepared geopolymeric slurries showed a Newtonian like behavior. |
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Keywords: | Geopolymer Fly ash Rheology Compressive strength High pressure Consecutive reaction |
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