All issues Volume 74 (2019) Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles, 74 (2019) 27 Full HTML
A gas leaks from a breach in the casing. Gas migrates through the cement and reaches a shallower aquifer layer, at which point its pressure is much higher than in situ groundwater pressure and even, in many cases, higher than geostatic pressure.
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