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Method for enhanced redeployability of hyjack platforms

  • US 5,741,089 A
  • Filed: 12/23/1994
  • Issued: 04/21/1998
  • Est. Priority Date: 12/23/1994
  • Status: Expired due to Term
First Claim
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1. A method for redeploying an offshore platform structure from a first site to a second site of different water depth, comprising:

  • releasing the connection between a subsea jacket base and a plurality of piles which are anchored in the ocean floor at the first site, said releasing comprising cutting through a plurality of pile sleeves and the piles locked therein to remove pile-to-pile sleeve connections in an extended first stage of the pile sleeves;

    vertically raising the offshore platform structure by pumping air into a plurality of the tank members, each being an elongated cylinder vertically aligned in load bearing relationship with underneath a discrete contact point of the subsea rig support interface corresponding to the to the footprint of a jack-up rig;

    resizing a surface tower supported upon subsea jacket base while the jacket base is vertically raised;

    towing the offshore platform structure to the second site;

    vertically lowering the offshore structure by ballasting the tank member;

    installing the platform at the second site with the surface tower above the ocean surface and a subsea rig support interface presented within the depth capability of a jack-up rig.

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