1) The first and the largest in diameter casing string is called conductor.
2) Surface casing is the second string run in the hole and cemented.
3) Another smaller in diameter casing string called intermediate casing can be applied.
4) Intermediate casing strings should be run in the hole when it is not feasible to drill the well to the design depth without preliminary isolation of problematic zones.
5) Production casing is the string, in which the well is completed and controlled.
6) Christmas tree is designed to hold casing and tubing strings and isolate or seal annulus between these strings.
7) Standard Christmas tree assembly includes adaptor flange, master valve, flanged cross, top adaptor, secondary master valve, wing valve, and a choke.
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