InterMoor successfully replaced (8) spiral-strand platform wires on a permanent production facility in May 2011 without requiring a platform shutdown or loss of production. The operation was completed using a single Construction Anchor-Handling Vessel (CAHV) at a significant cost savings from the traditional method involving a derrick barge.
Each mooring line consisted of unjacketed spiral-strand wire at the fairlead, two sections of jacketed spiral strand in the water column and studless chain at the seafloor. Syntactic-foam submersible buoys had been installed at each spiral-strand wire connection, so each mooring line had two buoys.
Only the platform wires were to be replaced, and the remaining mooring components including the buoys were to be reused. Protecting the existing components from damage during recovery and reinstallation posed several unique challenges. One of the main operational challenges was to design a way to bring the upper buoy and platform wire out of the water and secure them on deck so that the old platform wire could be disconnected. To accomplish this, InterMoor designed and installed a custom hang-off porch at the CAHV’s stern. The porch used a combination of pneumatic and hydraulic cylinders to manipulate and align the entire porch as each buoy connection was recovered and deployed. The porch also had separate stoppers for the socket connections and a removable cradle for the buoy. Another operational challenge was the unknown condition of the buoys themselves, particularly since they were to be reused on the replacement wires. There was no industry experience at the time in retrieving foam buoys that had remained submerged at depth for over a decade. This paper will explore these challenges and others in more detail as well as the steps that were taken to successfully overcome them.
STX OSV Holdings Limited (“STX OSV”), one of the major global designers and shipbuilders of offshore and specialized vessels, has received an order for the design and construction of a large, advanced Offshore Subsea Construction Vessel (OSCV) for Ocean Installer and Solstad Offshore.
The contract value amounts to approximately NOK 1.4 billion. Ocean Installer and Solstad will have joint ownership of the vessel, which is to be operated by Ocean Installer. The vessel is scheduled for delivery from STX OSV in Norway in 2Q 2014. The hull will be delivered from STX OSV in Romania. The contract is subject to board approval by the Norwegian Guarantee Institute for Export Credits (GIEK), expected to be received on or around 20 June 2012.
The vessel, of type OSCV 06L, has been designed by STX OSV and Solstad in close cooperation with Ocean Installer, and is highly advanced in terms of station keeping, efficiency and operational performance. The vessel is designed to operate efficiently under demanding conditions and is well fitted for SURF (Subsea,Umbilicals, Risers, Flowlines) operations.
The vessel is 156.7 meters long, 27 meters wide and has an aft cargo deck area of 2,100 m2. She will be equipped with a 150 t Vertical Lay System (VLS) and a 3,000 t below deck carousel, Remotely Operated Vehicles (ROVs) in hangars launched through moonpools, and two AHC offshore cranes (400 t and 100 t) which both can operate down to depths of 3,000 meters. The accommodation facilities will have a capacity of 140 persons. The vessel is designed according to the latest environmental standards with focus on low fuel consumption.
Steinar Riise, CEO of Ocean Installer said: “We are very satisfied with placing the contract for this new-build, and are looking forward to developing our operations with this vessel, which is built for heavy construction work, and is highly advanced when it comes to station keeping, efficiency and operational performance. This investment is in line with our growth strategy, as the vessel is capable of conducting the full range of subsea construction operations in the global market. Moreover, this joint venture consolidates the strategic cooperation between Solstad and Ocean Installer”
Ocean Installer is a Norwegian subsea entrepreneur headquartered in Stavanger,Norway. Ocean Installer holds strong EPCI expertise within the SURF (Subsea, Umbilicals, Risers, Flowlines) segment and is rapidly expanding its operations andorganization within and beyond the North Sea basin. Solstad Offshore ASA is among the largest shipping companies in Norway, providing advanced vessels and extensive maritime competence for operations related to the offshore petroleum industry. The company has about 1,600 employees, and operates 50 vessels all over the world. Solstad Offshore is headquartered in Skudeneshavn, Norway and has branch offices in Brazil, Singapore, United Kingdom and Australia
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Infield Systems have made a report on the offshore construction activity demand in order to recognize key regions and gauge supply developments stressing the possibility for activity increase due to the arrival of transcontinental pipelines and the deepwater tie-in of various satellite wells matched to an increased level of subsea installations. Demand is expected to reach its peak during 2015.
A considerable growth is expected in Asia and West Africa to 2016, supported by West African projects perceived as one of the key constituents of the emergent deepwater market and the region is seen as a key to a continued utilization of strategic assets. The Asian market features numerous countries including Malaysia, India, China and Indonesia, each reflecting differing dynamics, providing a slightly different opportunity for vessel operators who are keen to secure high utilization.
The global recession has affected all offshore developments and oil companies forcing them to restructure their capital cost commitments together with their offshore expansion plans.
Considerable confidence in Global financial markets has been regained. The declining oil price trend seen in Q2 2011 stabilized during Q3 2011. Greatly depending on whether the major economies return to recession, the global oil demand is anticipated to grow, although at a slower rate than expected.
Infield Systems strongly believe that the level of activity for specialist vessels will increase as E&P ventures expect to rise as a result of exploited reserves.
Vessel operators dealing with harsh and remote environments are most likely to be at the forefront of the expected growth. However, Infield Systems expects the global fleet to become more technologically advanced.
Infield Systems’ Global Perspective Specialist Vessels Market Report To 2016 is dedicated to the construction and construction support vessels that are employed in the development of offshore oil and gas fields. The third edition of this ground breaking report provides an in depth analysis of global and regional trends and the supply and demand dynamics for the period 2007 through to 2016.
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Technip Norge AS have declared an option to the existing contract for the 2012-season on the OCV “NORTH SEA GIANT” and will now retain the vessel until end 2013.
Technip also holds options for the vessel for 2014 and 2015.
M/V North Sea Giant has been designed for long term construction works in the open sea, supporting a crew of 120 people . The ship has a heliport, exercise hall, movie theater and sauna. There are two cranes on deck, one with a load capacity of 400 tons and the other 250 tons.
The vessel is one of the biggest OCV in the world at this moment. It is 156 meters long, 30 meters beam and over 22 MW of installed power.
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