Completion of a well. The process by which a well is brought to its final classification – basically dry hole, producer, or injector. It is also a generic term used to describe the assembly of downhole tubulars and equipment required to enable safe and efficient production from an oil or gas well. Completion can also be described as an operation intended to complete a well through the Christmas tree as a producer of Petroleum in one or more Zones, including the setting of production casing, perforating, stimulating the well and production testing conducted in such operation. The point at which the completion process begins may depend on the type and design of well.