An essential part of any field development project or well test is the design and installation of a well completion. A good design allows efficient and safe production from reservoir to surface during a long time. Provision should be made for changing well conditions, e.g. vertical lift for increasing water-cuts or decreasing reservoir pressures, sand production and corrosion by reservoir fluids. In addition, a variety of well intervention operations should be allowed for: BHP surveys, stimulation, removal of deposits, well control by safety valve or killing and wire-line/coiled tubing operations. During the course data gathering, data interpretation and production planning are highlighted. Special attention is given to integrated field development and operations in order to achieve a balanced reservoir/wells/surface facilities interplay aiming to assure efficient reservoir drainage, optimal well performance and effective separation of gas, oil and water.