Fixed Platforms † Steel template Structures † Concrete Gravity Structures 2. Ah, layman terms. Introduction to offshore structures 1. Despite the increasing application in recent years of high strength steels in the offshore industry, their use in the fabrication of conventional jacket structures is generally restricted to steels with yield strengths in the range 450--550 MPa and to topside applications. Each has a number of sub-categories – see Table 1 which also lists their uses, advantages and disadvantages. 25 CHAPTER 3 TYPES OF OFFSHORE STRUCTURES Figure 2.5 Tension-Leg Platform 3.7 Gravity-Based Structure A gravity-based structure (GBS) is a support structure held in place by gravity. The major motivation to build this type of structure is create a barrier between sea waves and structures such as harbors in order to avoid detrimental effect of sea waves like erosion. The following must be considered, a- Add a tolerance of 1m to the theoretical water depth (depth from sea bed to lowest, astronomical tide). … Different types of offshore structural systems have been developed over time due to the requirements for obtaining oil and gas in locations with greater water depth. The template is piled into the sea bed in a location considered to be the most favourable for reaching the hydrocarbon reservoirs. They are more common in more exposed settings than in estuaries. Offloads into shuttle tankers. Between 1947 to the mid-1990s, approximately 10,000 offshore platforms of different types, configurations, and sizes were installed worldwide. 1. Different types of offshore concrete structures are: 1. Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Offshore Engineering and Technology Day1AM 5 Historical Development of Fixed Offshore Structures Gravity Base Structures placed on the seafloor and held in place by their weight … A drillship may be used to drill wells of 2500m or more. Floating Structures † Floating Production System There are, different types of offshore structures in use today. j- Drilling derrick: to drill new wells, drill wells for EOR, and to modify and repair existing wells. The course will give a brief overview of different types of offshore structures that are deployed in sea for exploiting oil, gas and minerals. Offshore Structure Design, Construction and Maintenance covers all types of offshore structures and platforms employed worldwide. The piles, after being driven, are cut off above the templates, and the deck is placed on top of the piles. As the ultimate reference for selecting, operating and maintaining offshore structures, this book provides a roadmap for designing structures which will stand up even in the harshest environments. Note: W
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