There are a number of areas in horizontal well casing design that may differ from a standard well. These mostly relate to the casing loading, although there can be instances where the capacity of the casing is purposely reduced.
Fpr the horizontal section itself, the stability of the formation must be determined in order to assess whether the casing in this section has to withstand the full overburden pressure.
In the case that the casing will be subject to formation loading, computer program should be used to determine the casing behaviour . . .