TY - JOUR
T1 - Nano-chemo-mechanical signature of conventional oil-well cement systems
T2 - Effects of elevated temperature and curing time
AU - Krakowiak, Konrad J.
AU - Thomas, Jeffrey J.
AU - Musso, Simone
AU - James, Simon
AU - Akono, Ange Therese
AU - Ulm, Franz Josef
N1 - Publisher Copyright:
© 2014 Elsevier Ltd.
PY - 2015/1
Y1 - 2015/1
N2 - With ever more challenging (T,p) environments for cementing applications in oil and gas wells, there is a need to identify the fundamental mechanisms of fracture resistant oil well cements. We report results from a multi-technique investigation of behavior and properties of API class G cement and silica-enriched cement systems subjected to hydrothermal curing from 30 °C to 200 °C; including electron probe microanalysis, X-ray diffraction, thermogravimetry analysis, electron microscopy, neutron scattering (SANS), and fracture scratch testing. The results provide a new insight into the link between system chemistry, micro-texture and micro-fracture toughness. We suggest that the strong correlation found between chemically modulated specific surface and fracture resistance can explain the drop in fracture properties of neat oil-well cements at elevated temperatures; the fracture property enhancement in silica-rich cement systems, between 110° and 175 °C; and the drop in fracture properties of such systems through prolonged curing over 1 year at 200 °C.
AB - With ever more challenging (T,p) environments for cementing applications in oil and gas wells, there is a need to identify the fundamental mechanisms of fracture resistant oil well cements. We report results from a multi-technique investigation of behavior and properties of API class G cement and silica-enriched cement systems subjected to hydrothermal curing from 30 °C to 200 °C; including electron probe microanalysis, X-ray diffraction, thermogravimetry analysis, electron microscopy, neutron scattering (SANS), and fracture scratch testing. The results provide a new insight into the link between system chemistry, micro-texture and micro-fracture toughness. We suggest that the strong correlation found between chemically modulated specific surface and fracture resistance can explain the drop in fracture properties of neat oil-well cements at elevated temperatures; the fracture property enhancement in silica-rich cement systems, between 110° and 175 °C; and the drop in fracture properties of such systems through prolonged curing over 1 year at 200 °C.
KW - Mechanical properties (C)
KW - Microstructure (B)
KW - Oil well cement (E)
KW - Thermal treatment (A)
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U2 - 10.1016/j.cemconres.2014.08.008
DO - 10.1016/j.cemconres.2014.08.008
M3 - Article
AN - SCOPUS:84907898276
SN - 0008-8846
VL - 67
SP - 103
EP - 121
JO - Cement and Concrete Research
JF - Cement and Concrete Research
ER -