How do block-modular oil platforms work?

Block-modular oil platforms

Fixed platforms may have as few as 3, or more than 50 well conductors. Generally, the drilling rig is not a permanent part of the fixed structure. However, on some occasions, the unit is left on the platform for future workovers or additional drilling, if removing it is uneconomical. Most units are complete, self-contained units that include their own power plant, accommodations, drilling equipment, life-saving equipment, and auxiliary services. However, some do not have their own power plant and obtain power from the platform’s generators, which are usually powered by produced natural gas. On large, central field platforms that have their own living quarters, the rig may not have its own accommodation facilities. In this case, the life-saving equipment (e.g., lifeboats and gas-detection, fire-fighting, and communication systems) is part of the fixed platform. Most fixed platforms have their own craneage, but, usually, it is not big enough to load or unload the components of a conventional platform rig. Most modern platforms are built to American Petroleum Inst. (API) standards, allowing movement of a standard API-configured platform rig from platform to platform with little or no modification

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