The final interval is either production casing. As with the casing intervals described above, the production casing string extends to the surface where it is hung off. As the smallest casing, it will former the outer boundary of the 'A' annulus, which may involve it being used for gas lift and well kills. A typical size is 9¨ý".
Please use the link
http://en.wikipedia.org/wiki/Casing_(borehole)
production casing 9 5/8"
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