Oil and gas

Scaldis has a vast experience in the installation of various types of jackets and topsides. To optimise operations, Scaldis prefers to be involved at an early stage of the design and fabrication process so that Scaldis' experience is incorporated in the final transportation and installation methodology.

The types of activities Scaldis carries out in this field are :

  • Placing of jackets, piles, topsides, vent booms and other related parts;
  • Transportation and installation of gravity based structures;
  • Module lift for the construction of FPSO vessels.

Projects

SCALDIS’ first monopile installation without the use of a gripper frame or installation template
SCALDIS’ first monopile installation without the use of a gripper frame or installation template

Rambiz, Scaldis' heavy lift vessel, successfully installed the unmanned gas platform L13-FI for NAM. The lifting, upending, positioning and driving of the monopile foundation was carried out using the Vibro Lifting Tool. The verticality of the monopile was installed well within tolerance, without the use of a gripper frame or installation template. A vibro hammer drove the pile down to six meters before the target penetration, before an impact hammer completed the job. Scaldis then installed the column and topside.

T&I of the L6-B minimum facility platform
T&I of the L6-B minimum facility platform

Wintershall Noordzee B.V. contracted Scaldis Marine Contractors NV to install the L6-B platform, in water 35m deep. The platform is 25NM north west of Terschelling, the Netherlands, in the Dutch sector of the North Sea.

Wintershall and Scaldis jointly developed a methodology that focused on minimising the duration of all offshore activities.  This is because the duration of the offshore activities automatically reduces risk and overall costs.

The newly developed methodology covers the transportation and installation of the complete flatform to the site.

The complete platform will be collected from a quayside in Rotterdam by the HLV Rambiz which has a capacity of 3.300 tons.  A special tool has been developed with hydraulic opening doors to enclose the platform mast. Rigging will be connected, via hydraulic shackles to the suction cans at the bottom part of the foundation.  The structure will then be lifted from the quayside into the hooks of the HLV Rambiz and transported to the installation site.

Upon arrival on-site, HLV Rambiz will moor in the correct position and orientation.  The complete platform will be lowered until the suction cans reach the seabed.  Scaldis has subcontracted SPT to execute the actual suction operations.

By reducing the pressure in the voids inside the suction cans, the suction cans will penetrate the seabed until they have reached the target depth of 10 metres.  This methodology is fast, efficient and environmentally friendly.  Upon completion of the section operation, the platform inclination will be verified.

The rigging connection will then be disconnected, the hydraulic spreader bar door opened and released from the structure.

 

 

T&I of the Elettra and Fauzia jackets
T&I of the Elettra and Fauzia jackets

Scaldis successfully installed the jackets for the gas platforms Elettra and Fauzia located in the Aegean Sea.

The tripod jackets, each between 700 and 800tonnes, were fabricated in Italy and transported via barges to the offshore site.

The Elettra jacket was installed in Croatian waters at a water depth of nearly 80m. Later the Fauzia jacket  was installed in Italian waters at a water depth of 67m.

Each jacket was lifted from the barge by HLV Rambiz and lowered into the water in a horizontal floating position.  With assistance of divers and ROV the jacket legs were submerged and the jacket was upended by the Rambiz cranes and set in position.

The foundation piles, all between 60 and 67m, were lifted into the sleeves and piled to target depth.  Grout was installed with the assistance of HLV Rambiz.

 

 

Installation of IKA-JZ jacket
Installation of IKA-JZ jacket

Scaldis has completed the installation of the IKA-JZ jacket for Saipem in Croatian waters.

The 73m-high tripod jacket was fabricated in Rijeka and transported horizontally on a barge to the offshore site. HLV Rambiz used both cranes to lift the jacket off the transport barge into the water. By means of flooding built-in buoyancy tanks, the jacket was seamlessly up-ended and positioned on the seabed using one crane. HLV Rambiz supported piling, grouting and miscellaneous assembly works in order to complete another faultless Scaldis offshore installation.

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