Well productivity is the major factor which determines the economic outcome of a well. It depends on the degree of communication between the welbore and the producing formation. Most oil and gas wells in the petroleum industry today are completed with a steel casing and cement to control the water influx and production from different zones. In these wells communication with the formation is re-established through perforations, usually created by firing shaped charges. The productivity of the resulting completion depends on design variables like shot density, penetration depth and phasing angle.
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