The Role of the Upper Geosphere in Mitigating CO2 Surface Releases in Wellbore Leakage Scenarios

The Role of the Upper Geosphere in Mitigating CO2 Surface Releases in Wellbore Leakage Scenarios by Dennis M. leNeveu, Frank B. Walton, John C. Tait, Marsha I. Sheppard, Kristine Hug for Natural Resources Canada CANMET Energy Technology Centre – Devon, Fifth Annual Conference on Carbon Capture & Sequestration, May 8-11, 2006, Alexandria, Virginia
The cement seals can degrade by chemical action or by fracturing, which increases the effective permeability of the cement. The seal between the cement and the casing and between the annulus and the surrounding formations can also degrade or be faulty at the time of cement emplacement. [Emphasis added]

Source:  The Role of the Upper Geosphere in Mitigating CO2 Surface Releases in Wellbore Leakage Scenarios

[Refer also to:

Fracking Aquifers      

Migration of Gas from Oil/Gas Fields      

Well Design and Well Integrity

 Kelly et al. (1985) examined changes in groundwater chemistry following a massive influx of gas from a “blow-out”

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