Materiales de Construcción, Vol 58, No 292 (2008)

Durability of API class B cement pastes exposed to aqueous solutions containing chloride, sulphate and magnesium ions


https://doi.org/10.3989/mc.2008.37506

J. J. Martín
Universidad de Sevilla, Sevilla, Spain

G. Márquez
Universidad de Huelva, Huelva, Spain

F. J. Alejandre
Universidad de Sevilla, Sevilla, Spain

M. E. Hernández
Universidad Central de Venezuela, Caracas, Venezuela, Bolivarian Republic of

Abstract


This paper discusses a durability study conducted on API class B cement, the type used in shallow oil wells, when exposed to aggressive formation water. Its resistance to the major ions, namely –SO4=, Mg+2 and Cl-–, is related both to its capacity to assimilate the aggressive action of each harmful agent and to the changes in the chemical reactivity of some of its components. The methodology used consisted in preparing and immersing cement specimens in neutral solutions containing variable concentrations of these ions to monitor the chemical reactions taking place. These solutions were analyzed and XRD studies were conducted for over a year to identify mineralogical variations. The purposes of the study were to determine the effects of joint ionic attack on this kind of cement and to monitor the variations in the calcium concentration in the aqueous solutions of Na2SO4, MgCl2 and NaCl in contact with API class B cement pastes

Keywords


durability; API class B cement; formation water; chloride; sulphate; magnesium ion

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References


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