Class H Oil Well Cement Hydration at Elevated Temperatures in the Presence of Retarding Agents: An In Situ High-Energy X-ray Diffraction Study

Autor:	Andrew C. Jupe, Angus P. Wilkinson, Karen Luke, Gary P. Funkhouser
Rok vydání:	2005
Předmět:	Cement In situ Diffraction Ettringite Materials science General Chemical Engineering Analytical chemistry Mineralogy General Chemistry Industrial and Manufacturing Engineering chemistry.chemical_compound chemistry X-ray crystallography Copolymer Slurry Tartaric acid
Zdroj:	Industrial & Engineering Chemistry Research. 44:5579-5584
ISSN:	1520-5045 0888-5885
Popis:	In situ powder X-ray diffraction was used to examine the hydration of API Class H cement slurries, with a water-to-cement ratio of 0.394, at 66, 93, 121, and 177 C under autogenous pressure in the presence of varying amounts of the additives tartaric acid, modified lignosulfonate, and AMPS (2-acrylamido-2-methylpropanesulfonic acid) copolymer. All of these retarding agents inhibited the hydration of crystalline C{sub 3}S (Ca{sub 3}SiO{sub 5}), but other modes of action were also apparent. The formation of ettringite was suppressed when tartaric acid was used by itself or in combination with other additives. Changes in the hydration of C{sub 3}S vs time could not be correlated in a simple way with the observed pumping times for the cement slurries. The largest changes in pumping time as a function of temperature occurred in a temperature interval where ettringite/monosulfate decomposes and crystalline hydrogarnet starts to be formed.
Databáze:	OpenAIRE
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