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Title: Nano-chemo-mechanical signature of conventional oil-well cement systems: Effects of elevated temperature and curing time

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.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [1] ;  [1]
  1. Civil and Environmental Engineering Department, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307 (United States)
  2. Schlumberger-Doll Research Center, 1 Hampshire St., Cambridge, MA 02139-1578 (United States)
  3. Schlumberger Riboud Product Center, 1 rue Henri Becquerel, Clamart 92140 (France)
Publication Date:
OSTI Identifier:
22395939
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 67; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CEMENTING; ELECTRON MICROPROBE ANALYSIS; ELECTRON MICROSCOPY; EV RANGE; FRACTURE PROPERTIES; FRACTURES; HEAT TREATMENTS; MICROSTRUCTURE; NEUTRON DIFFRACTION; SILICA; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION