Shell’s massive Olympus tension leg platform (TLP) set sail from Ingleside, Texas on 14th July, for a 425 mile trek to its final home on the Mars Field in the Gulf of Mexico.
For 10 days, tugboats will transport the over 120,000 ton platform to the location where work will begin to secure the platform in place. The Olympus TLP will be moored to the seafloor by tendons grouped at each of the structure’s corners and will float in approximately 3000 feet of water.
The Olympus TLP is Shell’s sixth and largest tension leg platform and will provide process infrastructure for two of Shell’s deep water discoveries, West Boreas and South Deimos. The project also includes pipelines that will be routed through West Delta 143C, the recently installed shallow water platform.
The Olympus TLP is expected to start production in 2014, producing at a rate of 100k boe.
The Dockwise Vanguard, the world’s largest semisubmersible Heavy Transport Vessel (HTV) to date, safely completed its first ever float-on operation earlier this week.
The vessel, loaded with the World’s largest semisubmersible offshore platform hull, the Jack/St. Malo, is now on her maiden voyage carrying the near 56,000 metric ton hull on her deck.
The Dockwise Vanguard successfully executed the float-on exercise of the Jack/St. Malo platform hull at the Silli-Do deep hole near the Samsung Heavy Industries yard in Geoje, South Korea. “The float-on operation was precisely and safely executed as planned. It took no more than 4 hours before the cargo stood firm on her cribbing,” states Ronald Goetheer, Project Manager at Dockwise. After almost two days of sea fastening, the Dockwise Vanguard departed at sunrise on the 12th of February, and will navigate around Cape of Good Hope heading towards the Kiewit yard in Ingleside, Texas, USA, where it is expected to arrive mid-April.
The Dockwise Vanguard is an innovative semisubmersible HTV that is redefining the limits of exceptional heavy marine transport. The vessel has been designed to enable operators and contractors consider opportunities for mega offshore units which were until now considered unthinkable. With the loading capacity of up to 110,000 tons, the vessel is designed to serve the top end market focusing on next generation offshore
Companies in the Oil & Gas industry can now specify much larger and heavier offshore structures, and these can be integrated at a single fabrication site. These mega structures can then be transported onboard the vessel to remote offshore locations, even in harsh climates where no commissioning facilities are available. This feature can help reduce costs and optimize the overall project. In essence, the new vessel will play an important role in the field development philosophy of Oil companies, since it will be capable of transporting fully integrated mega offshore units.
The vessel’s design is also expected to help operators and developers create value. With its capabilities, timely and risky phases of offshore projects can be managed prior to hookup and commissioning. Interface optimization, higher degree of risk mitigation, lower insurance premiums, improved schedule flexibility, and reduced time-to-production – as well as reduced offshore man-hours – are a few examples of opportunities. In addition, the vessel’s advanced technical capabilities enable it to offer a completely new service: offshore dry-docking.
Increasingly, FPSOs are being located in remote areas that lack support infrastructure. In this circumstance, an offshore dry-docking service can be specially valuable. The Dockwise Vanguard’s FPSO dry-docking capacity offers inspection, maintenance, and repair opportunities (amongst others) at different conditional modes. The FPSO could remain connected to its mooring and turret system while keeping the riser systems intact, with the possibility of continuing limited production. In this scenario, the FPSO will still be able to freely weathervane around the turret mooring, with controlled heading made possible by the vessel’s propulsion system. The vessels capabilities completely avoid or significantly reduce downtime.
The vessel is specifically designed to exceed the Oil & Gas industry’s expectations. “From the drawing board, we decided to engineer a truly exceptional vessel unlike others in the market,” states Michel Seij, Manager Engineering at Dockwise.
The Dockwise Vanguard is engineered to surpass current heavy marine transport limitations. The vessel’s deck covers a surface of 275 m x 70 m (902 ft x 230 ft) and is equipped with movable casings. In addition, the accommodation block and navigation bridge are located on the extreme starboard side. The vessel has no bow, and this, along with other design features, gives the vessel a unique appearance.
In addition, the vessel has a dedicated design for ultra-heavy units weighing up to 110,000 metric tons. Optimized deck strength and extreme wide-load capabilities are at the heart of the design philosophy; as are the vessel’s stability characteristics. It is equipped with a 27 MW redundant propulsion system consisting of two fixed propellers at the aft and two retractable azimuth thrusters at the bow. These can reach a maximum transit speed of 14 knots, which translates to average service speeds of 11-13 knots with cargo. In addition, the vessel allows for 16 m (53 ft) water above deck, accommodating cargoes with a higher draft.
Helix Well Cap Arrival at Ingleside, Texas Shorebase
Designed for subsea oil spill containment the Helix Fast Response System (HFRS) Well Cap consists of an 18-3/4″ –10ksi H4 hydraulic wellhead connector and a 13-5/8″-10ksi dual ram block with an 18-3/4″-10ksi H-4 mandrel profile up. The connector can be changed out to any other type of connectors via the use of adapters. The cap has a 13-5/8″ bore and side outlets 4-1/16″-10K BX-155. All functions on the Well Cap will be ROV operable. Two 3-3/16″ vents relieve high pressure and/or flow rate.
Helix Well Cap Being Loaded Out at Ingleside, Texas Shorebase
Helix Well Cap Being Loaded Out at Ingleside, Texas Shorebase (2)
Helix Well Cap Being Loaded Out at Ingleside, Texas Shorebase (3)
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HOUSTON – McDermott International, Inc. says it has signed a 10-year frame agreement with Helix Subsea Construction, Inc. for spool base services in the Gulf of Mexico.
“This agreement allows McDermott, when contracting with Helix, to offer full-service, shore-based pipeline stalking and spooling services from Helix’s premier 120-acre Gulf of Mexico spool base at Ingleside, Texas, to pursue deepwater and ultra-deepwater installation projects,” explained Stephen M. Johnson, chairman of the board, president and CEO, McDermott.
“By combining Helix’s established spool base services with McDermott’s state-of-the-art welding technology to support our newest subsea construction vessels and expanding subsea engineering resources, we can further offer full-service engineering, procurement, construction and installation for deepwater and ultra-deepwater subsea projects for Gulf of Mexico and Atlantic customers.”
Through the cooperation agreement, McDermott would fabricate the required mile-long stalks at Ingleside, and employ its own in-house automatic welding equipment, technology and technicians. The company says that these facilities and personnel will enable it to meet the stringent welding criteria required for deepwater subsea pipelines. The spool base is also designed for fabrication of pipeline end terminations, pipeline end manifolds, subsea manifolds and jumpers.
McDermott’s subsea construction vessels North Ocean 102 (“NO102”) and new-build lay vessel North Ocean 105 (“LV105”), due to be completed later this summer, both have reel-lay capabilities. LV105 is designed to lay both flexible and rigid pipe up to 16-in. diameter, with tension and hang-off clamp capacities of 440 tons and 550 tons, respectively. NO102 offers flexible and umbilical installation and is equipped with a 330-ton low squeeze pressure single tensioner and high capacity carousel.
McDermott says it will employ strict welding procedures, advanced welding technology and technical experts to meet or exceed client welding criteria for deepwater subsea pipelines, from the Ingleside-based spool facility. Photo courtesy of Helix Subsea Construction, Inc.
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