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Hyjack platform with buoyant rig supplemental support

  • US 5,593,250 A
  • Filed: 12/23/1994
  • Issued: 01/14/1997
  • Est. Priority Date: 12/23/1994
  • Status: Expired due to Term
First Claim
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1. An offshore platform structure for temporarily using a jack-up rig for well operations in deepwater applications, comprising:

  • a bottom founded jacket base;

    a surface tower supported by the jacket base and extending above the ocean surface;

    a platform deck supported by the surface tower;

    a subsea rig support interface presented at the top of the jacket base and adapted to support the jack-up rig for well operations; and

    a rig mat, comprising;

    at least one selectively buoyant and ballastable tank member;

    a jacket base interface presented on the bottom of the tank member which attaches on top of the jacket base on the rig support interface; and

    a secondary subsea rig support interface presented on the top of the tank member, interconnected in a load bearing relationship with the jacket base interface, and adapted to receive the jack-up rig;

    a mat locking connection between the subsea rig support and the jacket base interfaces to releasably secure the rig mat to the jacket base; and

    a rig locking connection between the jack-up rig and the secondary subsea rig support to releasably secure the jack-up rig to the rig mat and therethrough to the jacket base.

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