Sea gravity platform

FIELD: transport.

SUBSTANCE: invention relates to ship building, particularly, to sea gravity ice-breaking platform to be used in shallow water. Said platform comprises bearing plate composed of hollow body dividing in compartments filled with ballast and top displacement hull with processing and ship equipment built in bearing base deck closed elevation to uncouple them. Inner boundary of said deck elevation is equidistance in plan with floating structure outlines with difference in sizes defined by the relationship: δ=δïã , where δ is aforesaid difference, δï is maximum sum of construction deviation of sizes ob said body and hull from rated values, δã is guaranteed clearance required for alignment of top structure with platform bearing base outline.

EFFECT: higher operating efficiency in ice.

2 cl, 2 dwg

 

The invention relates to the field of shipbuilding, and more particularly to offshore gravity platforms, set mainly in shallow water.

Known offshore gravity platform according to the invention (patent RF №652880, priority 24.09.1976), consisting of an upper floating part and the lower anchor the parts in contact with the seabed. Both parts of the platforms are equipped with ballast tanks. Between the upper and lower parts provided deformable layer using one of the known materials. The bottom of the upper floating part is planar. The lower anchor portion provided with edges that prevent the shedding of the deformable layer prototype. This solution is quite reliable and ensures the operation of facilities in areas with a temperate climate. However, a disadvantage of the known solutions is the inefficiency of its operation in ice conditions with the action on the construction of the external horizontal ice loads due to movement of ice. The use of liquid ballast for ballasting the lower anchor portion of the platform increases the dimensions of the platform to accommodate the required amount of liquid ballast in tanks, and consequently, to the increase of ice loads on the platform.

The task of the invention is the elimination of the criminal code of the mentioned disadvantage, namely, the effectiveness of the exploitation of marine gravity platforms in ice conditions by reducing external ice loads on the platform.

This is achieved by the fact that the marine gravity platform, containing the supporting base in the form is divided into sections of a hollow body filled with ballast, and the upper floating structure in the form of hull-borne corps with technological and marine equipment according to the invention (patent RF №652880, priority 24.09.1976), deck supporting the base platform in the area of its sides and ends are made with elevation, forming a closed loop, and the upper floating structure made in the form of hull-borne body, built-in circuit closed above the elevation of the deck substructure with the possibility to divide them. The inner boundary of the closed exaltation in terms equidistant the contours of floating structures, with the difference in their respective sizes, defined by the relation δ=δ§ ã,

where δ is the difference in the respective sizes of the internal borders closed the elevation of the support base and the upper floating structures

δ§ - the maximum amount of technological deviations of the respective sizes of both buildings from the nominal values,

δã- the value of the guaranteed clearance, is required to align the top

structures with the inner boundary of the substructure of the platform.

In addition, the support base within the compartments has bunkers and hatches for loading of solid granular ballast.

Running deck supporting the base platform in the area of its sides and ends with the rise, forming a closed loop, and the execution of the upper floating structures in the form of a hull-borne body, built-in circuit closed mentioned the elevation of the deck substructure with the possibility of their separation from the inner boundary of the closed exaltation in the plan, equidistant to the contours of floating structures, with the difference in the respective sizes of δ ensures reliable retention of the upper floating structures under horizontal ice loads due to reliable mechanical contact with the support base of the platform.

The equipment support base within compartments bins and hatches for loading of solid granular ballast provides a reduction of the dimensions of the bottom supporting the base platform and the reduction in connection with horizontal ice loads on the hull of the support base relative to the prototype, which provides a system for liquid ballasting.

The essence of the invention is illustrated by drawings, where figure 1 shows schematically the sea is gravitatsionnoe platform, longitudinal view, figure 2 is a cross section A-a in figure 1.

Offshore gravity platform includes a support base 1 and the upper floating structure 2 with technological and ship equipment (not shown). The supporting base 1 is equipped with an elevation of 3, above the deck, forming a closed loop. The upper floating structure 2 is a plan equidistant inner boundary of the above-mentioned circuit 3. The supporting base includes compartments separated by transverse bulkheads 4 and have 5 bins for loose ballast within compartments. In the deck of the support base 1 is provided by hatches 6 disclosure-each hopper 5 for the loading of solid granular ballast. Offshore gravity platform works as follows. The supporting base 1 offshore gravity platform, being manufactured in the shipyard, is towed in a given area and is installed in a surface position on the selected area with a horizontal section of the bottom and secured the necessary number of temporary anchor links. Further compartments with bunkers 5 base 1 through hatches 6 filled with water through pumping equipment and systems support vessels (not shown), the supporting base 1 is immersed leaning on the bottom of the water area. Through collateral vessels is odaca loose ballast in bins 5 through the open hatches 6 with the displacement of liquid ballast. Is closing hatches 6. The upper floating structure 2 being manufactured separately from the support base 1, is towed in a given area and is installed directly above the sunken support base 1. With its own ballast system is provided by the ballasting and increased precipitation upper floating structure 2. In the process of this operation is the control of the relative position of both parts of the offshore gravity platform to dive the upper floating structures 2 in a closed loop formed by the elevation 3. The operation is completed when the bottom of the floating structure 2 is combined with the deck base 1. Elevation 3 above the deck base 1 provides reliable protection from shift offshore gravity platform under the action of horizontal ice load. The presence of a solid granular ballast in the support base 1 provides greater negative buoyancy compared to the use of liquid ballast. This is due to the difference in volumetric balance of solid and liquid ballast, and, consequently, a greater bonding force with the bottom. After the termination of the operation of the offshore gravity platform is pdfsprite upper floating structures to precipitation, which stops the contact between waswasa is receiving 3 the support base and the upper floating structure 2 using a custom ballast system. The upper floating structure 2 is towed for repair or disposal. Then opened the hatches 6 ballast hoppers 5, and disposal of solid granular ballast by leaching from bins 5 jets of water. When this solid ballast liquid is replaced with a corresponding decrease in the negative buoyancy of the support base. The supporting base 1 rises to the surface using, for example, lifting pontoons. After surfacing restores the positive buoyancy of the support base 1 by removing ballast using systems and equipment support vessels. The supporting base 1 is towed for repair or disposal.

We offer offshore gravity platform ensures the effectiveness of its operation in ice conditions by reducing the current on the outside of the ice load, which it distinguishes from the prototype.

Morskaya gravity platform, containing the supporting base in the form is divided into sections of a hollow body filled with ballast, and the upper floating structure in the form of hull-borne corps with technological and marine equipment, characterized in that the deck supporting the base platform in the area of its sides and ends are made with elevation, forming a closed loop, and the top of naplan the e building designed in the form of a hull-borne corps, built-in circuit closed mentioned the elevation of the deck substructure with the possibility to divide them, with the inner boundary of the closed exaltation in the plan, equidistant to the contours of floating structures with the difference in their respective sizes, defined by the relation: δ=δ§ ã,
where δ is the difference in the respective sizes of the internal borders closed the elevation of the support base and the upper floating structures
δ§ - the maximum amount of technological deviations of the respective sizes of both buildings from the nominal values,
δã- the value of the guaranteed clearance required for aligning the upper structure from the circuit supporting the base platform.

2. Offshore gravity platform according to claim 1, characterized in that the supporting base within compartments equipped with bunkers and hatches for loading solid loose ballast.



 

Same patents:

FIELD: transport.

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FIELD: construction.

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FIELD: construction.

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FIELD: construction.

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4 cl, 4 dwg

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1 dwg

FIELD: transport.

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16 cl, 4 dwg

FIELD: transport.

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22 cl, 12 dwg

FIELD: transport.

SUBSTANCE: invention relates to ship building, particularly, to production of ice-resistant platforms for exploration of freezing sea offshore oil and gas deposits. Proposed platform is equipped with remote turret assembly consisting of the block accommodating the turret and located outside platform hull to allow the latter to turn in external force main vector direction and to be retained in place by anchor system connected with said turret. Said block with turret are located under water ahead of fore perpendicular at the distance not smaller than half the difference between platform maximum length and that between perpendiculars. Block top is located level with the platform base plane. Said block features the hull axially symmetric shape with respect to vertical axis and is secured to platform hull with the help of corbel shaped to trihedral pyramid with clearance between ribs and facing the hull stem by its base. Pyramid two ribs are located in the platform base plane while third rib rests on said stem. Said rib features sharpened top edge.

EFFECT: higher safety of turret, anchor and riser lines in ice.

2 dwg

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