Today, oil is produced in almost every part of the world, from small offshore wells to water depths of 2000 meters. For offshore oil production, depending on the size and water depth, a whole range of different structures are used. Some of the common offshore structures are described below and can be seen in Figure 3-1: • Shallow water complex A shallow water complex is a network of several fixed platforms connected through gangways. The different platforms have different functions such as the Wellhead platform, the Accommodations platform and the Power Generation platform and so on. A shallow water complex is, as revealed by its name, useful in water depths not greater than 100 meters.