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Title

Modeling geochemical reactions in wellbore cement: assessing preinjection integrity in a site for CO2 geological storage

Publication Year

2013

Author(s)
  • Gherardi, Fabrizio
  • Audigane, Pascal
Source
GREENHOUSE GASES-SCIENCE AND TECHNOLOGY Volume: 3 Issue: 6 Pages: 447-474 Published: 2013
ISSN
2152-3878
Abstract

We present numerical simulations of isothermal reactive flow which might be induced by fluid migration at the caprock-cement interface of an idealized abandoned well in an area considered for geological sequestration of CO2 in the Paris Basin, France. The calculations are aimed at identifying the mineralogical transformations likely occurring in the cement during the working life and after the closure of the wells present in the area, before the injection of CO2. Field evidence, experimental data, and previous numerical simulations have been used to constrain the initial geochemical conditions and the hydraulic parameters of the model. Significant mineralogical transformations in the cement (portlandite and katoite dissolution, CSH, ettringite, hydrotalcite precipitation), and minor modifications of the initial clayrock mineralogical assemblage (quartz, montmorillonite and illite dissolution, and precipitation of cement-like phases) are predicted at the caprock-cement interface. Associated with these mineralogical transformations, measurable variations in porosity are also computed. Although Portland cement is predicted to retain its integrity at some distance from the interface, calculations confirm the general view that material alteration at the interfaces is of major concern for the minimization of the risks of CO2 leakage from storage zones. Numerical outputs are sensitive with respect to poorly constrained physical and transport parameters, such as the spatial distribution of interconnected porosity in the cement. Different degrees of portlandite dissolution/carbonate precipitation can be predicted during in situ ageing under conditions similar to the Paris Basin, depending on the adopted gridding scheme, i.e. on the conceptualization of the cement as a homogeneous or dual-porosity medium. (c) 2013 Society of Chemical Industry and John Wiley & Sons, Ltd

Author Keyword(s)
  • reactive transport modeling
  • CO2 geological storage
  • cement degradation
  • wellbore integrity
  • Paris Basin
KeyWord(s) Plus
  • C-S-H
  • UNDERGROUND-LABORATORY FRANCE
  • CALCIUM SILICATE HYDRATE
  • CALLOVO-OXFORDIAN FORMATION
  • SEQUESTRATION CONDITIONS
  • DISSOLUTION KINETICS
  • ALKALINE-SOLUTION
  • POROUS-MEDIA
  • FREE-ENERGY
  • MARNE
ESI Discipline(s)
  • Engineering
  • Environment/Ecology
  • Geosciences
Web of Science Category(ies)
  • Energy & Fuels
  • Engineering, Environmental
  • Environmental Sciences
Adress(es)

[Gherardi, Fabrizio] LE STUDIUM, Loire Valley Inst Adv Studies, Orleans, France; [Gherardi, Fabrizio; Audigane, Pascal] Bur Rech Geol & Minieres, Eau Environm Ecotechnol D3E, F-45060 Orleans, France

Reprint Adress

Gherardi, F (reprint author), CNR, IGG, I-56100 Pisa, Italy.

Country(ies)
  • France
  • Italy
CNRS - Adress(es)

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Accession Number
WOS:000328341500004
uid:/T5QLM5F1
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