7b—Terra Nova FPSO (Photographic Archives, Petro-Canada/Terra Nova). The Petronius Compliant Tower facility is in the deepwater area of the Gulf of Mexico at Viosca Knoll Block 786. A payload of up to 50,000 tons can be accommodated, including drilling or workover rig and full production equipment. The seabed is 535 m (1,754 ft) below the platform. Corporation and Marathon Oil in the Gulf of Mexico, 210 km southeast of New Orleans, United States. The topsides equipment and facilities are not dissimilar to those usually deployed for fixed steel structures. Other forms of deep-draft floaters include deep-draft semisubmersibles and hull arrangements other than the arrangement shown in Fig. A TLP deck may be fabricated separately from the hull and mated in a manner similar to that adopted for concrete gravity base platforms. The Petronius compliant tower is approximately 1870 feet in height, weighs approximately 43,000 tons, and is The facility is located at 28°13′44″ N/−87°47′51″ W and the area within 500 meters (1640.4 feet) from each point on the facility structure's outer edge is a safety zone. makes it one of the largest topside facilities in the world. The hull and deck, together with drilling facilities and quarters, will weigh more than 50,000 tons. International Database and Gallery of Structures, Offshore Technology: Petronius, Gulf of Mexico, USA. The rig consists of narrow, flexible (compliant) towers and a piled foundation supporting a conventional deck for drilling and production operations. All rights reserved. The restriction on vertical movement permits the use of fixed-steel-platform-type wellhead equipment and rigid steel riser conductor assemblies. 4, if the design principle were for no contact between the risers, a cost penalty in ultra-deep water would be expected; If contact between risers is the accepted design principle, it is then important to predict their dynamic behavior, evaluate the impact energy during contact, and define acceptance criteria. For wet trees, possible development concepts include all of these plus ship-shaped floating production systems and semisubmersible production systems. [The sources should be available to the reader, i.e., not an internal company document. Baldpate Compliant Tower is the first free-standing tower that is not supported by external ropes, at the same time it is one of the highest structures in the world, it even exceeds CN Tower . ). The Benguela Belize Topsides dry weight of 33,300 s.t. It was built from 1997 to its completion in May 2000, at a cost of $500 million. No media files are currently available for this data page. The advantages and disadvantages for each option are considered at the design stage from both engineering (redundancy, robustness, etc.) In common with all spars, the vertical risers support the dry trees at the topsides, thereby providing continuous access to the wells for re-entry. 1—The Baldpate Compliant Tower is one of the tallest free-standing structures in the world – Empire State Building (right) for comparison (Web Photograph, Amerada Hess Corp., New York City). 5 has successfully been deployed for the Horn Mountain field and has been chosen for the Holstein field, both of which are in the Gulf of Mexico. • Petronius is a deepwater compliant tower oil platform in the Gulf of Mexico, 210 km southeast of New Orleans. 6. A deep-draft floater is a floating system that is provided with a deep-draft hull designed to minimize heave motions. Compliant towers are designed to sustain significant lateral deflections and forces, and are typically used in water depths ranging from 1,500 to 3,000 feet (450 to 900 m). However, the buoyancy requirements for a TLP may be two to five times that of a semisubmersible, and, therefore, construction facilities used for semisubmersibles may be too small for TLP fabrication. Dry trees allow direct and continuous access to the wells for maintenance and re-entry. Alternatively, a single-piece construction can be adopted for the deck and hull with equipment and facilities placed on the completed platform. Deepwater riser systems have been acknowledged by the industry as representing critical technology for current planned and future field developments. 7a and Fig. and economic standpoints. 5—A typical truss spar (courtesy of BP). The cost of the project has been estimated at $500m. The 4000-tonne North Module was installed in November 1998, but the attempt to install the slightly lighter South Module in December of that year ended with the unit on the seabed. Texaco & Marathon. Petronius is a deepwater compliant tower oil platform operated by Chevron . Mooring is achieved using a taut system of mooring lines composed of chain and wire or polyester. Ship-shaped production vessels, although used extensively around the world, were ruled out because of riser load and the technical infeasibility of bringing fluids at high temperatures and pressures onto a weathervaning vessel using the industry’s standard solution of a moving swivel. 2, adopted for the Lena platform in the Gulf of Mexico) are sized on the principle of “compliance” to wave attack. Help with editing, Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. [3,658 bytes] Off to a blistering start, Texaco's Petronius compliant tower was about to set an industry record for time from spudding to … The upper section of the hull is a conventional cylindrical shell and provides the required buoyancy for the platform. A compliant piled tower design, it is 609.9 metres (2,001 ft) high, and was arguably the tallest free-standing structure in the world, until surpassed by the Burj Khalifa in 2010, although this claim is disputed since only 75 metres of the platform are above water. A spread of mooring lines is used for station keeping during production, and flexible flow lines are adopted, which permit wave-induced vessel motions to be absorbed. The influence of this and other factors, notably the very large topsides load and the requirement for multiple well centers to access the entire reservoir, finally led to selection of a semisubmersible, but one with a difference—its scale. A conventional FPS typically uses either a semisubmersible to accommodate the equipment and utilities or a ship-shaped monohull, the latter often built from converted oil tankers. The compliant tower design was chosen for its ability to withstand hurricane conditions and operate in depths of 2,000ft (610m). This forces the natural period to be less than that of the damaging significant wave energy, which lies in the 8- to 20-second band. 2, adopted for the Lena platform in the Gulf of Mexico) are sized on the principle of “compliance” to wave attack. The reservoir itself lies deep below the seabed—some zones are more than 3.7 miles down; others lie below salt formations, requiring costly and time-consuming wells. The platform will be held on station by 16 mooring lines made of chain and steel wire rope. Additional steelwork is required to stiffen the structure. All the concepts discussed and described allow for the wellheads and Christmas tree valve systems to be above the waterline (i.e., in the dry). Locating the piles near the center of the tower, limiting the maximum tower deflections, and selecting piles of sufficient length to absorb the imposed loads can limit the resulting stresses in the piles. This system has been deployed for the Girassol FPSO in West Africa in 4,500 ft of water. They have less weight and, in the taut configuration, provide lower vessel movement and a reduced footprint on the seabed. A compliant tower (CT) is a fixed rig structure normally used for the offshore production of oil or gas. If you would like to help us illustrate this page, do not hesitate to send us your images! The field’s operator Texaco owns 50% of the field, while the remaining 50% is owned by Marathon. The platform comprises a deck structure and a buoyant hull that is composed of a series of vertical cylindrical columns, horizontal submerged pontoons, and, in some instances, tubular member bracing. In: Marine Structures , v. 37 (July 2014) , pp. Each line will be anchored to the seabed by suction piles, giving the semisubmersible the ability to survive in the Gulf of Mexico’s hurricanes. Wet trees, so-called because the wellheads and Christmas trees are placed on the seabed. 1 and Fig. SPE disclaims any and all liability for your use of such content. In this instance, intermediate structural bracing can be accommodated because barge clearance is not required. A number of offshore platform concepts exist that meet the dry tree requirement. A two-piece construction and installation can be adopted, as was used for the Petronius platform installation. 3 illustrates the TLP concept. Petronius is a deepwater compliant tower oil platform operated by Chevron in the Gulf of Mexico, 210 km southeast of New Orleans, United States. Fig. These tendons suppress the heave motions, and the tension ensures that the platform remains virtually horizontal even at lateral excursions of up to 10% of the water depth. Latitude: 29° 06' 18.00" N Compliant towers can be constructed using techniques that have evolved for steel-jacket structures. A unique combination of characteristics is at play in the Thunder Horse field, dictating the facilities for the project. Another compliant structure is the guyed tower, which is a slender truss-steel structure supported on the sea floor by a spud-can foundation and … The concept shown in Fig. Fig. These are among the highest yet to be handled in the offshore industry. 8a), which will serve as a processing, drilling, and quarters platform for the field, supporting up to 40 production and injection wells. ], Use this section to list papers in OnePetro that a reader who wants to learn more should definitely read, Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro, Fixed steel and concrete gravity base structures, Flow assurance for offshore and subsea facilities, Flexible risers and steel catenary risers (SCR), https://petrowiki.spe.org/index.php?title=Compliant_and_floating_systems&oldid=46966, 4.5 Offshore facilities and subsea systems, Copyright 2012-2021, Society of Petroleum Engineers, Compliant towers for water depths up to 3,000 ft, Tension leg platforms (TLPs) for water depths up to 5,000 ft with the potential for application to 7,000 ft following further development effort, Floating production systems for water depths up to 7,000 ft. 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