In certain cases, multiple production casing sizes are used across formations of the same pressure regime especially in vertical<br>or slightly deviated wells with long pay sections. The normal perforation practice would be to use a smaller gun size to<br>perforate the smaller lower casing section before making another perforating run with bigger gun size to perforate the upper<br>casing. Such perforating technique not only adds cost and time to the completion program but also reduces the efficiency of<br>the perforation tunnels due to damage caused by the completion fluids in the wellbore between the two perforation runs. In<br>addition, underbalanced perforation can only be performed on the first perforating run. Isolation of the first zone would be<br>required to create under-balance for the second run, thus adding cost and complexity to the operations.


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