Table 1.

Parameters of the micro-annuli

7 inch casing9⅝ inch casing
Embedded ImageThickness of the micro-annulus 50 µm50 µm
Embedded ImageRadius of the cement sheath 0.108 m0.156 m
Embedded ImagePermeability of the pathwayEmbedded Image2 × 10−10 m22 × 10−10 m2
Embedded ImageOpen surface of the pathwayEmbedded Image3.4 × 10−5 m24.9 × 10−5 m2
Embedded ImageLength of the pathway along each casing 988 m1220 m
Embedded ImageTransmissibility of the cement sheathEmbedded Image7.2 × 10−18 m38.4 × 10−18 m3