期刊
ROCK MECHANICS AND ROCK ENGINEERING
卷 46, 期 3, 页码 455-464出版社
SPRINGER WIEN
DOI: 10.1007/s00603-012-0336-9
关键词
Carbon sequestration; Wellbore integrity; Fracture flow and transport; Chemo-mechanical coupling
资金
- DOE National Energy Technology Laboratory [AA3030100]
- Office of Basic Energy Sciences of the US Department of Energy [N. DE-AC0-2-05CH11231]
- agency of the United States government
- LLNL [DE-AC52-07NA27344]
Fractures in wellbore cement and along wellbore-cement/host-rock interfaces have been identified as potential leakage pathways from long-term carbon sequestration sites. When exposed to carbon-dioxide-rich brines, the alkaline cement undergoes a series of reactions that form distinctive fronts adjacent to the cement surface. However, quantifying the effect of these reactions on fracture permeability is not solely a question of geochemistry, as the reaction zones also change the cement's mechanical properties, modifying the fracture geometry as a result.This paper describes how these geochemical and geomechanical processes affect fracture permeability in wellbore cement. These competing influences are discussed in light of data from a core-flood experiment conducted under carbon sequestration conditions: reaction chemistry, fracture permeability evolution over time, and comparative analysis of X-ray tomography of unreacted and reacted cement samples. These results are also compared to predictions by a complementary numerical study that couples geochemical, geomechanical and hydrodynamic simulations to model the formation of reaction fronts within the cement and their effect on fracture permeability.
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