Experimental and modeling study of calcium carbonate precipitation and its effects on the degradation of oil well cement during carbonated brine exposure

Journal Article · Wed Nov 14 23:00:00 EST 2018 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2018.03.016· OSTI ID:22806532

Huet, Bruno ^[1]

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1. LafargeHolcim R&D, 95 rue de Montmurier, 38291 Saint-Quentin-Fallavier (France)

Decalcification of cement in solutions of carbonated brine is important to a host of engineering applications, especially in subsurface service environments where cementitious materials are frequently utilized as engineered barriers for wellbore seals, as well as shaft and drift seals and waste forms for nuclear waste disposal. Analysis of leaching simulations and experiments shows that, depending on solution compositions (dissolved CO{sub 2} concentration, pH, Ca ion concentration), calcite precipitation occurring during leaching of cement in contact with carbonated brine can have a significant impact on cement reactivity, in some instances leading to complete arrest of reactivity via calcium carbonate ''pore-clogging''. We present modeling and experimental results that examine the range of solution conditions that can lead to pore-clogging. Analysis of the results shows that distinct regimes of leaching behavior, based on pH and pCO2, can be used to form a framework to better understand the occurrence of pore-clogging.

• OSTI ID: 22806532
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 113; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
BRINES
CALCITE
CALCIUM CARBONATES
CALCIUM IONS
CARBON DIOXIDE
CEMENTS
CONCENTRATION RATIO
DIFFUSION BARRIERS
EXPERIMENT RESULTS
LEACHING
OIL WELLS
PH VALUE
PRECIPITATION
RADIOACTIVE WASTE DISPOSAL
SEALS
SIMULATION
WASTE FORMS