VAALCO Gabon platform installation and subsea tie-backs

Phase One Utilizing the Lewek Express called for the installation of subsea flowlines and related equipment in the Marin Field 200 miles southwest of Port Gentil, Gabon.

Phase Two saw the commercial project debut of the Lewek Constellation, with the heavy lift and installation of two fixed production platforms, the Etame and Seent. It was the first usage of the Constellation’s 3000 mt Huisman crane.

Phase Three will involve the repositioning and laying of flexible subsea flowlines, plus installation of topsides equipment and two helidecks.

(Click below to view our project photos.)

Coniston subsea tie-back for Apache offshore Australia

This subsea tie-back project for Apache Energy in the Coniston Field offshore Australia involved turn-key project engineering, project management, surveys, pipe and equipment installation, inspection, testing and removal of construction debris from the sensitive Ningaloo Reef area.

Ten-inch flowlines were recovered from the seabed in 380 m of water and connected to new 10- and 12-inch flowlines. The assignment also included installation of 4- and 6-inch gas lift lines and a new 6-slot manifold with other distribution system components such as PLEMs and jumpers.

EMAS provided pigging, inspection, leak testing and pre-commissioning of all lines, as well as an as-built ROV survey video.

Fifty-four platforms and piping installed for Chevron in Gulf of Thailand

A 3-year assignment from Chevron in the Gulf of Thailand was successfully completed with the installation of 54 shallow water platforms and topsides equipment without a recorded safety incident.

This included pile installation and welding, jacket lifting, as well as installation and construction of 91 subsea pipelines of varying lengths. The Lewek Champion was deployed as the primary construction vessel.

Zap-Lok pipe connection technology was used for the first time in 70 m water depth to construct reinjection lines for produced water.

BP Atlantis subsea system change-out in GOM

This was a complex decommissioning and commissioning project in more than a mile of water in the Green Canyon Field of the Gulf of Mexico. The first phase was to shut-in the field and remove a series of manifolds, jumpers, pigging loops and related equipment for testing on sea floor mud mats.

After flushing, the old equipment was combined with new hardware and reconnected to the subsea tie-back system, and the field was restarted.

The world’s longest subsea tie-back for Noble Energy

Noble Energy’s Tamar platform sits in 800 feet of the Mediterranean Sea offshore Israel, atop one of the world’s largest gas reservoirs. EMAS was selected to install more than 305 km (190 miles) of umbilical cable to tie-back five wells to the main platform.

The project also involved installation of a 328 tonne manifold along with associated flexible and rigid jumpers, electrical, hydraulic and optical flying leads and other equipment.

Transportable reels speed Noble deepwater tie-back projects

The Lewek Constellation with its heavy lift capability and transportable reel delivery system significantly reduced total installation time for three deepwater tie-backs, an 80-mile pipe-in-pipe flowline system and 56 miles of umbilicals for Noble’s Big Bend and Dantzler wells in the Mississippi Canyon field of the Gulf of Mexico.

More than 30 heavy lifts involving rigid pipe reels between 900 and 2200 metric tons were conducted in open water, reducing transit time and eliminating the need for direct spooling by the installation vessel. This allowed the Lewek Constellation to stay in pipe-lay mode throughout the entire project.

The assignment also included installation of an 8-inch insulated steel catenary riser, plus flowlines and umbilicals from the three wells to the ThunderHawk host platform.

Gulen spoolbase faciitiates Apache gas line project in North Sea

An 8-inch steel pipeline was installed by EMAS to connect Apache’s Aviat gas field to its Forties platform in the North Sea. This project allows the replacement of diesel fuel with environmentally friendly natural gas for power generation needs.

The contract included installation of a 23 km pipeline and umbilical, installation of a 6-inch flexible riser, as well as a control jumper, tie-in spools, SSIV and 77-ton manifold.

The new EMAS Gulen Spoolbase performed at record fabrication rates, with average welds of 113 per shift and repair rates of 0.16%.

Statoil templates installed in record North Sea depths

EMAS crews have successfully completed the installation of three subsea templates for Statoil’s Aasta Hansteen field in North Sea water depths to 1300 meters. The templates weighed 260 metric tonnes each.

The templates were designed to be installed within a deviation of only 0.3 degrees – which the client reported was “managed with a good margin.”

The subsea wells will tie-back to a new spar platform, which is reported to be the world’s largest and the first spar on the Norwegian continental shelf.

FPSO Mooring System installation in Gulf of Guinea

EMAS was selected to install and connect nine mooring legs for FPSO operator MODEC in the deepwater Tano block of the Gulf of Guinea, offshore Ghana. Average water depth was 1500 meters.

The project was split in two phases, the first to install suction piles for temporary wet storage. The second phase required recovery and hook-up of the tension mooring legs, and testing of the turret rotation device.

Lengthy HVAC line installed offshore Norway

EMAS has completed installation of a 160 km (100 mile) high voltage alternating current (HVAC) shore-to-platform power line for the Martin Linge platform in the North Sea. This is reported to be one of the world’s longest subsea HVAC lines.

The HVAC line, which contains fiber optics, has a diameter of 186 mm, weight in air of 77 kg/m and rated voltage of 132 kV.

The Martin Linge platform will be a manned wellhead jacket platform containing process, separation and compressor capability. The operator is Total E&P Norge AS.

Petrobras GOM fields push umbilical lay project to new depths

The Petrobras Americas Cascade/Chinook Field project in the Gulf of Mexico presented several unusual and demanding challenges for installation of two 8-inch umbilicals in 2680 meters of water. Mega-furrows carved by deepwater currents required high tension and layback to be maintained in order to prevent the umbilicals from sagging into the furrows and breaking.

Once initiated, each line had to be installed without stopping to accommodate a maximum submergence depth of only 200 m for the 45-foot pull heads. A purpose-built tower in the spooling carousel allowed the pull-heads to be stored and transported vertically, and contributed to the project being completed 15 days ahead of schedule.

Subsea cabling laid for world’s largest wind farm cluster

EMAS was contracted to lay 67 km of HVAC and FO cabling for the Dolwin1 wind farm converter platform in the North Sea. Dolwin1 is the world’s most powerful offshore converter, providing 916 mW of clean wind energy to the German power grid.

The HVDC platform was designed and installed by ABB for operator TenneT, a leading European transmission system operator.

EMAS was responsible for cable lay and trenching, as well as route preparation, rock dumping and installation of the mattress supply apparatus.

EMAS provides decommissioning services for Statoil’s Glitne Field

Comprehensive decommissioning services were provided by EMAS for seven subsea wells in Statoil’s Glitne Field in the North Sea. First oil in Glitne was in 2001 and approximately 55 million barrels were produced over its 12-year life span.

The contract included a pre-removal survey, disconnecting flowlines, risers and umbilicals, removal of structures and covers, removal of risers and dynamic umbilicals, removal of riser bases, removal of static flowlines and umbilicals, removal of concrete mattresses, equipment disposal and a post-removal survey and debris clean-up.

All operations were executed with no undesirable incidents or LTI.

EPCI services for new Ivar Aasen North Sea gas field

Three gas production and gas lift pipelines have been completed for Det Norge Oljeselskap in the North Sea Ivar Aasen Field. EMAS provided EPCI services for the project, including installation engineering, production of pipe, spools, PLETs and protection covers, and pre-commissioning and testing.

EMAS is also providing engineering, trenching and installation of power cable lines, as well as tie-in with other subsea lines in the region. Water depth is approximately 115 meters.