Materiales de Construcción, Vol 61, No 303 (2011)

Attack of carbonic anhydride and hydrogen sulfide on API class H cement slurries exposed to saline formation waters


https://doi.org/10.3989/mc.2010.54509

G. Márquez
Dpto. de Ingeniería Minera, Mecánica y Energética, Universidad de Huelva, Palos de Frontera, Huelva, Spain

F. J. Alejandre
Dpto. de Construcciones Arquitectónicas II, Universidad de Sevilla, Spain

J. J. Martín-del-Río
Dpto. de Construcciones Arquitectónicas II, Universidad de Sevilla, Spain

R. Arribas
Departamento de Ingeniería de Diseño y Proyectos, Universidad de Huelva, Palos de Frontera, Huelva, Spain

F. J. Blasco
Dpto. de Construcciones Arquitectónicas II, Universidad de Sevilla, Spain

Abstract


This paper discusses the attack of the major ions (sulfate, chloride, and magnesium) and sour gases, present in natural gas (CO2 y SH2), on API class H cement, the type used in gas wells under high pressure and temperature. The effects of these chemical agents on this cement was simulated to study the physicochemical changes due to the action of sour gases and formation water. Cement specimens were immersed in neutral solutions containing fixed concentrations of the major ions inside Parr reactors. These solutions were analysed and XRD analyses were conducted for over two months to identify mineralogical variations from 14 to 60 days. The objective of this research was to determine the effects of the joint attack of major ions and sour gases on cement pastes. The main effects of both gases, jointly or separately, on cement durability were, respectively, the carbonation process and the leaching of some components.

Keywords


Petroleum wells cement; durability; cement slurries; DRX; Crystalline phases

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