Subsea systems are typically in use at depths of 7,000 ft or more, and do not have the ability to drill, only to extract and transport. This allows one strategically placed production platform to service many wells over a reasonably large area. The well is drilled by a moveable rig, and instead of building a production platform for that well, the extracted natural gas and oil are transported by riser or even by undersea pipeline to a nearby production platform. Just as in a FPS, the petroleum is extracted at the seafloor, and then “tied-back” to an already existing production platform. Subsea production systems are wells located on the sea floor, as opposed to at the surface. Speight, in Subsea and Deepwater Oil and Gas Science and Technology, 2015 3.3.6 Subsea Production Systems In turn, the new tension leg platform and single (independent) pillar platforms occupy a small proportion, because they are not mature. The combination with subsea production systems with floating semi-submersible platforms also occupies a large proportion and it is related to the semisubmersible platform’s comparatively mature design and construction. b.Īmongst subsea production system combinations, the FPSO vessel always occupies a large proportion through the years, as this advantageous scheme coincided with the growth in China's offshore oil field development. The number of applications of subsea wellheads varies with each year and continues to increase in every major region of the globe, and the number of subsea wellheads used in deep-water oil field is also increasing, from about 17% since the 1990s to 33% in the early part of this century. In Figures 4-75 and 4-76 and Table 4-16 we can see: a. The distribution of several combinations in different yearsįigure 4-76 shows the development trends of the applications of deep-water subsea wellhead in the world. Subsea production systems + fixed oil platforms 2. Subsea production system + semi-submersible floating production platform e. Subsea production system + floating production, storage, and offloading tanker d. Subsea production system + tension leg platform c. Subsea production system + single column (independent) production platform b. An existing subsea production system combined with equipment on the surface mainly has the following several of applications in deep water ( Figure 4-72). Here several proposed equipment combinations refer to the subsea production system combination of SPS with surface production facilities. No matter which solution is adopted, we can choose different solutions for combinations of equipment. When we use subsea production system to explore deep-water oil fields, the exploration mode depends on whether there are surrounding facilities or we are in an independent development mode.
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