Perforating creates a direct link between the wellbore and the producing formation by making holes in the casing and the cement sheath that surrounds it. The quality and quantity of the perforation holes (tunnels) in a given oil- or gas-bearing formation have a direct influence on well productivity. Completion engineers need to ensure that the perforations they produce are deep, clean, located in the right place, and correctly oriented. In this article, Larry Behrmann and Chee Kin Khong review recent advances in key perforation technologies and examine how dynamic underbalanced perforating is helping to deliver new levels of performance for wells in the Middle East and Asia. The economic value of an oil or gas well depends on the connection between the wellbore and the formation. The completion and production engineers, who define the form and the function of this connection, have three key objectives: allow the oil into the well, where it can flow naturally or be pumped fig01_perforating_m7 fig01_perforating_m7 to the surface; exclude water from the overlying or underlying units; and keep any formation rock particles out of the well.
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