The Role of the Upper Geosphere in Mitigating CO2 Surface Releases in Wellbore Leakage Scenarios [USA Dept Energy removed the paper. Access it here.] 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:
Migration of Gas from Oil/Gas Fields
