Perforation is the process used to establish a flow path between the near reservoir and the wellbore. It normally involves initiating a hole from the wellbore through the casing and any cement sheath into the producing zone. The effectiveness of the perforating process depends on the care and design of the procedure. Because a high percentage of current wells use a cased-hole completion, the importance of the design and application of the perforating process cannot be overstated. Perforations are an elemental piece of the inflow section of the well and have significant impact on the total completion efficiency.