期刊
GHGT-11
卷 37, 期 -, 页码 5692-5701出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.egypro.2013.06.491
关键词
wellbore; zonal isolation; cement; fracture; reactive transport; dissolution; precipitation
资金
- National Risk Assessment Program
- U.S. DOE National Energy Technology Laboratory
- Geological CO2 Storage Industrial Affiliates Program at the Center for Petroleum and Geosystems Engineering at UT-Austin
Lab scale experiments were performed to characterize how coupling between reaction and flow affect time-dependent flux of CO2-rich water along leaky wells. The core flow system applies confining stress to a cement core with a single tensile fracture while CO2-rich water is injected at constant rate and elevated pore pressure. Results show no significant variation in pressure differential, despite the development of a texturally distinct calcium depleted channel along the fracture surfaces which is bounded by thin rims of precipitation. Silicon rich material remains in the channel and prevents wormhole development and large increases in aperture. Implications for time-dependent CO2 leakage are that even with high fluid flux, the leak does not get appreciably worse. (C) 2013 The Authors. Published by Elsevier Ltd.
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