DRY-TREE SEMI-SUBMERSIBLE PRODUCTION AND DRILLING UNIT
First Claim
1. A dry-tree semi-submersible production and drilling platform unit, comprising:
- a semi-submersible hull portion, the hull portion including a ring pontoon and at least four columns connected to the ring pontoon;
a mooring portion anchored to a sea floor and mechanically coupled to each of the at least four columns;
a topside portion supported by the hull, the topside portion including a deck box with at least one of a plated bottom and a grated bottom;
a wellbay portion positioned in a central location of the deck box and configured to support a drilling substructure, a production substructure and a plurality of top-tensioned risers, the wellbay portion including a plurality of well slots arranged in a grid pattern, the drilling substructure configured to provide vertical access to each well slot in the grid pattern;
a top-tensioned riser portion including the plurality of top-tensioned risers and at least one of dry-trees and direct vertical access to each of the plurality of well slots;
a catenary riser portion including a plurality of steel catenary or flexible risers, each of the steel catenary or flexible risers being hung from the ring pontoon; and
a riser tensioning subsystem having a plurality of riser tensioners configured to provide vertical motion compensation for each of the plurality of top-tensioned risers,wherein the riser tensioning subsystem is characterized by a tension level parameter, a stroke length parameter, and a stiffness parameter, and wherein a set of values for the tension level parameter, the stroke length parameter, and the stiffness parameter is determined based on a field water depth, a number of wells in the wellbay portion, a predetermined top-tensioned riser configuration, and a predetermined topside capacity.
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Accused Products
Abstract
A deep draft semi-submersible production and drilling platform unit with dry trees is described. The platform unit preferably comprises four columns, a ring pontoon, a two-axis symmetrical hull with draft in the range of 100 to 155 feet, top-tensioned risers with push or pull tensioners of preferred combined vertical stiffness of 10% to 30% of the platform water plane stiffness, a well-bay with a well spacing in the range of 12 to 18 feet, a riser guiding system supported by the pontoons or at an elevated level, topside facilities supported by a box type of deck structure, mooring lines, and catenary risers.
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Citations
12 Claims
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1. A dry-tree semi-submersible production and drilling platform unit, comprising:
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a semi-submersible hull portion, the hull portion including a ring pontoon and at least four columns connected to the ring pontoon; a mooring portion anchored to a sea floor and mechanically coupled to each of the at least four columns; a topside portion supported by the hull, the topside portion including a deck box with at least one of a plated bottom and a grated bottom; a wellbay portion positioned in a central location of the deck box and configured to support a drilling substructure, a production substructure and a plurality of top-tensioned risers, the wellbay portion including a plurality of well slots arranged in a grid pattern, the drilling substructure configured to provide vertical access to each well slot in the grid pattern; a top-tensioned riser portion including the plurality of top-tensioned risers and at least one of dry-trees and direct vertical access to each of the plurality of well slots; a catenary riser portion including a plurality of steel catenary or flexible risers, each of the steel catenary or flexible risers being hung from the ring pontoon; and a riser tensioning subsystem having a plurality of riser tensioners configured to provide vertical motion compensation for each of the plurality of top-tensioned risers, wherein the riser tensioning subsystem is characterized by a tension level parameter, a stroke length parameter, and a stiffness parameter, and wherein a set of values for the tension level parameter, the stroke length parameter, and the stiffness parameter is determined based on a field water depth, a number of wells in the wellbay portion, a predetermined top-tensioned riser configuration, and a predetermined topside capacity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification