Platform for offshore installation

Abstract

A method to manufacture a platform for offshore installation by determining one or more properties selected from a group consisting of a desired length, a cargo tonnage requirement, a heavy lift capacity, total buoyancy, and an operating depth of the platform, and designing a hull section, a first jack up rig, and a second jack up rig based on the determined properties. The first designed jack up rig is joined to a first end of the designed hull section, and the second designed jack up rig is joined to a second end of the designed hull section located opposite the first end.

What is claimed: 
     
         1 . A platform for offshore installation comprising:
 two or more jack up rigs;   a hull section, wherein the two or more jack up rigs are fixed to a first end and a second end located opposite the first end of the hull section.   
     
     
         2 . The platform of  claim 1 , wherein the first end and the second end of the hull section are joined to the two or more jack up rigs via bolts and flanges, welds, or combination thereof. 
     
     
         3 . The platform of  claim 1 , wherein the two or more jack up rigs each have two or more legs of a length of 5 to 200 meters. 
     
     
         4 . The platform of  claim 1 , wherein the two or more jack up rigs have been retrofitted or reconditioned for reuse. 
     
     
         5 . The platform of  claim 1 , wherein the hull has been retrofitted or reconditioned for reuse. 
     
     
         6 . The platform of  claim 1 , wherein the two or more jack up rigs each have two or more legs of a length of 10 to 180 meters. 
     
     
         7 . The platform of  claim 1 , wherein the hull comprises one or more materials selected from the group consisting of welded steel sheets, ABS steel, a steel having a high carbon content, a steel having a low carbon content, and one or more steel alloys. 
     
     
         8 . The platform of  claim 1 , further comprising:
 one or more cranes having a lift capacity up to 200 tons;   one or more heavy lift cranes having a lift capacity up to or exceeding 1500 tons; and   one or more retractable and steerable propellers.   
     
     
         9 . A method to manufacture a platform for offshore installation, the method comprising:
 determining one or more properties selected from a group consisting of a desired length, a cargo tonnage requirement, a heavy lift capacity, total buoyancy, and an operating depth of the platform;   designing a hull section, a first jack up rig, and a second jack up rig based on the determined properties;   joining the first designed jack up rig to a first end of the designed hull section; and   joining the second designed jack up rig to a second end of the designed hull section, the second end located opposite the first end.   
     
     
         10 . The method of  claim 9 , wherein designing the first and second jack up rigs comprises independently selecting a newly built jack up rig, a decommissioned jack up rig, or a refurbished jack up rig. 
     
     
         11 . The method of  claim 9 , wherein joining the first jack up rig and joining the second jack up rig to comprises one or more flanges and bolts, welding, or a combination thereof. 
     
     
         12 . The method of  claim 9 , further comprising: attaching one or more of light duty cranes, heavy lift cranes, a helideck, living accommodations, cargo deck space, propellers, buoyancy chambers, ballast chambers, and extendable legs to the platform.