Cantilevered mobile marine rig with hydraulic load equalizer
First Claim
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1. A mobile marine rig, which comprises;
- a deck structure having an outboard edge;
a cantilever assembly including well drilling means mounted at one end thereof, said cantilever assembly being slidingly mounted for horizontal movement on said deck structure to project said one end of said cantilever assembly beyond said outboard edge of said deck structure;
and a plurality of horizontally spaced apart cylinders of substantially equal diameter supported by said deck structure adjacent said outboard edge beneath said cantilever assembly, each of said cylinders having vertically slidingly mounted therein a piston arranged to transmit forces to said cantilever assembly, and means for supplying hydraulic fluid to and hydraulically interconnecting each of said cylinders to allow free flow of hydraulic fluid among said cylinders, thereby to equalize the pressure within each of said cylinders and equalize the force applied to said cantilever assembly by each of said pistons.
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Abstract
Disclosed is a cantilever mobile marine rig with hydraulic load equalizer. The rig includes a deck structure and a cantilever assembly slidingly mounted on the deck structure. The hydraulic load equalizer includes a plurality of hydraulic cylinder and piston assemblies positioned between the deck structure and the cantilever assemblies. The hydraulic cylinder and piston assemblies each have substantially the same effective area and are interconnected so as to allow substantially free and unimpeded flow of hydraulic fluid among the cylinder and piston assemblies.
49 Citations
14 Claims
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1. A mobile marine rig, which comprises;
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a deck structure having an outboard edge; a cantilever assembly including well drilling means mounted at one end thereof, said cantilever assembly being slidingly mounted for horizontal movement on said deck structure to project said one end of said cantilever assembly beyond said outboard edge of said deck structure; and a plurality of horizontally spaced apart cylinders of substantially equal diameter supported by said deck structure adjacent said outboard edge beneath said cantilever assembly, each of said cylinders having vertically slidingly mounted therein a piston arranged to transmit forces to said cantilever assembly, and means for supplying hydraulic fluid to and hydraulically interconnecting each of said cylinders to allow free flow of hydraulic fluid among said cylinders, thereby to equalize the pressure within each of said cylinders and equalize the force applied to said cantilever assembly by each of said pistons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for distributing stresses between a supporting surface and a supported surface which comprises:
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a cylinder block; a plurality of hydraulic cylinder and piston assemblies spaced apart in a plane and mountable between said supporting and supported surfaces, each of said assemblies including a cylinder formed in said cylinder block and a piston reciprocably mounted in said cylinder for movement normal to said plane to apply forces between said supporting and supported surfaces, each of said assemblies having substantially equal effective areas acted on by hydraulic fluid; and passages in said cylinder block for hydraulically interconnecting said assemblies with each other to allow free flow of said hydraulic fluid among said assemblies, thereby to equalize the pressure within all of said assemblies and equalize the force applied to each of said pistons. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification