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BOOKSHELF CASSETTES.

  On existing platforms  On prepared platforms  On new platforms  Advantages  Previous page

This installation method for cassettes and modules is one of the most efficient low cost ways of increasing the capacity of an existing platform.

TRC has studied two main scenarios; sequential platform development and platform add-ons. 

Bookshelf cassettes on existing hot platforms.

For the existing platform, the add-on is made easy simply by loading cassettes to book-shelves fitted to the platform outside. This will off course require modifications to the existing platform or module structure. To look at the GAM Case study, press : Bookshelf

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Bookshelf cassettes on prepared platforms.

This wellhead platform was to a certain extent prepared for the later installation of an additional module. The preparation was made as two brackets braced up to the upper truss connection with the platform leg extension on the weather deck. The planned module weight was 500 ton.

Later, it was planned to install a module with an estimated weight of some 600 ton. In addition, one anticipated that the installation of this module had to take while a drilling rig was operating partially over the platform.

TRC proposed a new module geometry, and installation method as shown on the artist impression.

Animated presentation will be found as a download. 

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Cassettes for new platform designs from TRC

Since you never know for sure what the reservoir contains before it has been emptied, the project risk will be reduced and the profit increased by designing the platform for a sequential development scenario. 

This particular platform design is one of a series of platforms designed by TRC in order to reduce investment cost, make stepwise development really economical, and at the same time reduce cost of maintenance and final de-commissioning. These platforms may in fact also be moved around to other sites. 

This patented platform design takes advantage of 100% flexibility in topsides cassette change-out. On the picture, you can see that the platform is actually designed like a crane standing on the sea bed. The heavy lift equipment is always present.  The picture shows the fully developed platform with water treatment cassettes, 3 gas turbine driven injection cassettes and a gas turbine driven gas lift cassette. In addition a temporary workshop / LQ cassette has been installed during the hook-up period.

The platform is a water injection / gas lift platform with bridge connection to a production platform. The savings in structural steel, installation cost, project execution time etc. reduces the cost with 40% compared to a traditional platform design. The investment profile , hence the NPV of the project will be strongly effected by this.

You can even use the principles on a GBS type of platform.

This platform was planned for a stepwise development by using the bookshelf principle and cassettes. On the picture, one can see how the new cassette is lifted up and supported by the truss system fabricated as part of the platform topsides.

This fully integrated topsides design also was made to accept stepwise development. Notice the fully developed system deck being lifted from the vessel and up into the topsides. This platform follow the patented IPEF design and fabrication method. (Look under platform topsides design.)

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Advantages:

Take a look at some of the optimized new platform designs from TRC that take full advantage of this design strategy.

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TR Consulting, Joh. Falkb.gt. 10, 5538 Haugesund, Norway. Tel: +47 52729124, Fax: +47 52724196, C.E.O. Cell phone.  +47 90 616969  e-mail: trcons@online.no or trcons@start.no