Sea gravity platform
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=δï+δã , 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§ +δã,
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§ +δã,
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.
SUBSTANCE: invention relates to sea gravity platforms for exploration of oil and gas deposits at continental shelf. Proposed platform comprises submersible offshore platform composed by bottom and top bearing plates, sidewalls and internal bulkheads. Bell consisting of separate sections is hinged to submersible platform bottom part. Every said section comprises vertical wall, stiffness ribs and guide pipes. Stiffness ribs have support elements at the points of abutting on bottom plate. Submersible platform sidewalls includes element for attachment of said bell in transport position and recesses to accommodate retainer pints.
EFFECT: higher stability, low draft, fast assembly and disassembly.
SUBSTANCE: platform comprises a support base made in the form of a bottom board with a developed surface, strongly connected with a perpendicularly installed ice-resistant support block, somewhat protruding towards the bottom below the level of the near-bottom plane of the board. At the same time the ice-resistant support block is made in the form of a cylindrical column; special pipes - water-separating columns installed into the ice-resistant support block, through which operating wells are drilled; a superstructure made in the form of three replaceable floating decks with U-shaped cuts in the centre: decks of civil construction purpose, decks of drilling purpose and decks of operational purpose, at the same time U-shaped cuts are made as congruent to the cross section of the ice-resistant support block; detachable lifting mechanisms installed on the outer side along the perimeter of the U-shaped cut of the deck, engagement or disengagement with the support base is provided, as well as movement and fixation of the deck at the safe height of the ice-resistant support block; piles for fixation of the support base drilled with a drilling plant along a curvilinear trajectory provide for safe operation of the structure.
EFFECT: increased reliability of operation and process safety of an area of water during civil construction and drilling works.
3 cl, 3 dwg
SUBSTANCE: support structure of a marine complex, designed for installation in shallow water, is characterised by the fact that it comprises at least two supports installed in shallow water, every support is made of at least one rigid shell closed along the perimetre and filled inside with stone material, besides, the lower shell of the support is installed on the sea bottom, and each of the above installed shells in the lower part is made of smaller size along the perimeter that the perimetre of the upper part of the more lower shell. Besides, at least a part of the upper shell is made with a cone shape. Each support is made as capable of installation of process objects and equipment of the marine complex and placement of elements that combine separate process objects into a whole marine complex between supports. The specified upper shell has a diameter in the range from 30 to 60 metres.
EFFECT: provision of efficient protection against ice and wave loads, reduction of construction time, lower material intensity.
24 cl, 12 dwg
SUBSTANCE: method for coupling of a floating caisson, having funnel-shaped foundation shells, with a base (also with unprepared bottom of a water area), includes fixation of the design position of the floating caisson by means of its installation onto mounting supports or piles and filling with a material of artificial base into internal cavities of the funnel-shaped foundation shells. Actions of base protection (including an artificial one) are implemented from washing with flows of water that washes it.
EFFECT: increased reliability and durability of a base in a floating caisson, increased manufacturability: its coupling with a base.
7 cl, 1 ex, 1 tbl, 6 dwg
SUBSTANCE: shallow-draught self-lifting floating plant comprises a body with an upper deck, a bottom, side walls and supports with lifting mechanisms. Along all or a part of side walls outside the body from the bottom level there are floatage compartments not reaching to the upper deck.
EFFECT: provision of maximum increase of floatage of a plant with minimum increase of its mass, which makes it possible to minimise subsidence of a plant for its operation in shallow areas.
FIELD: oil and gas industry.
SUBSTANCE: group of inventions refers to designs and formation methods of ice-resistant drilling facilities for development of shallow marine continental shelf. Drilling facilities include a self-lifting floating drilling rig with a cantilever, which has a housing and supports, at least one of which is ice-resistant, as well as drilling platform facilities with an ice-resistant housing, which can be installed in a fixed manner at the sea bottom and has upper superstructure for arrangement of equipment. Housing of the drilling rig is equipped at least with two retractable slides oriented towards the drilling platform facilities and mounted so that they can be moved in horizontal plane to transfer the load from the rig housing by means of the above slides to the drilling platform facilities. In the drilling platform facilities housing there are seats corresponding to retractable slides of the self-lifting floating drilling rig. Ice-resistant support of the drilling rig is mounted so that it can be borne against the soil to transfer the load to the sea bottom. The rest supports of the rig are non-ice-resistant and mounted so that they can be lifted above the rig housing after the load transfer from the housing through the drilling platform facilities and ice-resistant support to the sea bottom.
EFFECT: improving reliability at simplifying the design of the facilities, as well as enlarging its operating capabilities by installing the facilities in shallow water.
4 cl, 10 dwg
SUBSTANCE: ice-resistant monopod self-rising floating drilling rig has a support base and an upper body with a sliding console and a drilling tower, mounted as capable of vertical displacement by means of climbing the support pillar, firmly attached with the support base. The support pillar of the rig is arranged as transparent. The diameter of the specified support pillar makes at least 0.25 and not more than 0.3 of the support base diameter. To protect the drilled well against ice impact, the rig is equipped with a protective pillar, mounted in the space under the drilling tower with the possibility of deepening into soil and attached with the upper end to the upper body of the rig. For the possibility to evacuate the well upon completion of drilling, in the stern part of the support base there is an opening. The protective pillar is fixed with the upper end to the upper body of the rig by means of the bracket mounted on the latter.
EFFECT: invention makes it possible to increase reliability of a structure under conditions of freezing water areas, in soils with low bearing capacity.
2 cl, 5 dwg
SUBSTANCE: complex comprises an ice-resistant support base, made of water-displacing sections, and a superstructure mounted on the support base as capable of vertical displacement along support pillars arranged in the form of an autonomous self-rising floating drilling rig, comprising a body, support pillars with a mechanism of rising and a drilling tower. The support base is made as composite of the support and ice-breaking parts, besides, the ice-breaking part is made as capable of placement and joining with the upper part of the support part of the base under the bottom of the self-rising floating drilling rig installed on the support part. The rig body is installed as resting along the perimetre onto the ice-breaking part of the base for provision of minimum body sagging in its middle part. The method includes manufacturing, transportation and installation of an ice-breaking drilling complex for developing a shallow continental shelf.
EFFECT: higher reliability and safety of complex design and method of its establishment.
4 cl, 7 dwg
FIELD: process engineering.
SUBSTANCE: method of fitting said body in unequipped bottom comprises filling inner cavities of said funnel-like shell beds with soil material. Said body is fixed in design position by installing it on mounting supports.
EFFECT: practically feasible installation, decreased labor input and material input.
2 cl, 9 dwg, 1 ex
SUBSTANCE: invention relates to hydraulic engineering construction of structures and may be used for year-round drilling under conditions of the Arctic shelf. The platform comprises a bottom ballasted plate with an inbuilt support unit and a superstructure. The bottom plate is made in the form of an upper part, a lower part and a sliding sectional support unit of telescopic type. The support unit comprises telescopic sections that are separated at the installation point with a sliding mechanism. Telescopic sections, the sliding mechanism and all required auxiliary devices are installed in sluice compartments. All telescopic sections are of identical height, cylindrical or prismatic shape, and comprise guide slots on the inner and outer surface. Inner and outer cuts of the sections are selected for each other so that arrangement of sections is provided within each other with a gap sufficient for sliding and sealing of sections along the section guides relative to each other, in accordance with the telescope principle. The lower section's cut is larger than the upper one's. Sections of the support unit are arranged in a reinforced ice version. The invention also discloses methods of transportation, assembly and disassembly of a self-lifting mobile ice-resistant drilling platform of telescopic type.
EFFECT: increased reliability of a platform, lower labour intensiveness of methods of its transportation, assembly and dismantling.
13 cl, 3 dwg
SUBSTANCE: invention relates to ship building, particularly, to construction of floating fueling station with fuel tank built in the hull. Proposed station has pontoon-type hull with lengthwise sides and desk, transverse bulkheads to divided hull inner space into compartments, at least, one two-wall fuel tank arranged inside the compartment along hull sides at preset distance therefrom. Said tank comprises inner and outer lengthwise and crosswise walls, and top and bottom walls. At least, lengthwise walls are shaped to rectangle. Note here that tank outer lateral crosswise walls are formed by compartment bulkheads while its top outer walls if composed by the deck. Method of station construction consists in that tank inner walls are mounted first before fitting it into station hull. Then, rectangular lengthwise outer walls and outer bottom are mounted. Tank is fitted into hull compartment and tightly jointed with crosswise bulkheads and deck to make tank outer crosswise and top outer walls.
EFFECT: increased pay volume, lower metal input, simplified assembly.
16 cl, 6 dwg
SUBSTANCE: invention relates to ship building and may be used in making boats and motor boats. Proposed method comprises attachment of transverse and lengthwise elements to skin, said elements including side and bottom frames, floors, bottom and side stringers, and keelsons. Floors, bottom branches of frames, bottom stringers and keelsons are secured by welding, side stringers and side frames are glued in place while side frames are secured to bottom frames, floors, gunwale and side stringers by riveting. Used glue is universal single-component polyurethane-based glue.
EFFECT: decreased negative thermal effects, simplified refinement of hull exterior.
2 cl, 3 dwg
SUBSTANCE: suggested invention relates to ship building and concerns manufacturing of hulls for river and sea vessels of concrete or reinforced concrete. Suggested method for construction of floating facility provides for preliminary selection of type and ensuring availability of floating facility the hull structure of which meets requirements placed on casing for concrete works. The said floating facility is arranged in displacing position. Feed, distribution and compacting of concrete mixture is provided into cavities formed by hull structure elements of the said floating facility thus forming concrete or reinforced-concrete hull of floating facility.
EFFECT: higher technological effectiveness of river and sea vessels hull construction of concrete or reinforced concrete.
8 cl, 1 dwg
SUBSTANCE: invention relates to floating offshore structures, particularly, to spar-platform offloading, launching and canal towing. Invention allows large-diameter spar-platform offloading and launching using existing heavy-freight ships. U-like reservoir is used for artificial increase in length and buoyancy to help lift the platform from track onto ground in offloading. U-like reservoir ensures required buoyancy and waterline area for launching spar-platform from said ship. After ship sailing, U-like reservoir is displaced to under transition frame extending from spar-platform stiff reservoir top part. U-like reservoir is ballasted upward for lifting stiff reservoir and reducing its draft. At reduced draft, stiff reservoir strip ends do not touch canal bottom. This allows towing spar-platform along berth industrial site for extra processing.
EFFECT: simple and reliable offloading and launching.
10 cl, 14 dwg
SUBSTANCE: invention relates to ship building, particularly, to ship building by modular assembly and may be used at shipyards with horizontal building sites and vertical lifters or floating docks for launching. Proposed method comprises prefabrication of hull freight part units, making hull ends units and tanks, and assembling the ship from prefabricated units and tanks. Note here that every unit of freight part is made without deck and one crosswise bulkhead that make unit open compartment to be transferred to launching structure located at pool embankment to be arranged so that its open part is directed ashore. Then, said unit is lowered unless its bottom supper surface is aligned with embankment surface to use surface carrier to move the tank and to complete unit assembly by installing deck structures and second bulkhead, or final assembly is completed at launching structure.
EFFECT: faster building, lower labor input.
5 cl, 2 dwg
SUBSTANCE: invention relates to ship-building, in particular to production tooling and equipment to equip process of manufacturing hull structures. Method for assembling flat sections of ship hull consists in manufacturing flat sections on single working place-position without moving up to complete production. Assembling-welding operations with assembled sections are made by self-propelled floor-standing machines which are wheeled and tracked, manoeuvrable, small-sized, multifunctional, equipped with load-handling, electrosticking, assembling and arc-welding devices.
EFFECT: higher productivity of labour due to section manufacturing on single place.
SUBSTANCE: in the proposed method a half-block of a cylindrical insert for a vessel with a double hull is formed on receiving platforms of a rotary device making it possible to weld all welding seams in a technologically convenient lower position, for this purpose operations of device rotation are repeated technologically for a required number of times. In the rotary device used to realise the method there is a casing, the external surface of which is arranged in the form of a cylinder with a horizontally arranged axis, along which in the body there is a prismatic groove forming two adjacent congruous planes on the inner surface arranged at the angle of 90° to each other and arranged in the form of platforms. On these platforms there are fixators for fixation of planar sections, and also on them there are rail tracks installed along the casing axis coupled with workshop rail tracks. The device casing rests on rollers fixed on axes in rotary shells installed on the foundation. Besides, the device is added with the third congruous plane arranged at the angle 90° to the second plane and parallel to the first one, and besides, axes of all or some of the specified rollers are connected by a drive with an electric motor.
EFFECT: reduction of production areas, labour intensiveness and reduced duration of a technological process, possibility to manufacture finished half-blocks at one production position with a different angle of a transverse inclination of a deck.
4 cl, 4 dwg
SUBSTANCE: method of construction of floating structures, mostly semi-submersible platform, consists of the superstructure, installed on the supporting columns and pontoons in the dry dock with an area. In the dock pontoons are installed, on which columns are built, and technological overpass between them. On the dock area the topside is constructed and having moved it along the overpass from the column, they connect with them. Initially, the column and overpass are constructed to the level of the dock site. After moving to the top structure to the columns received the dock is filled with water, providing pontoons surfacing with columns and superstructure. After this overpass height is being extended. The dock is to be drained then, providing thus sinking the pontoons, with columns at the bottom. The column constructing is to be finished at the height of the top structure.
EFFECT: reduction of the amount of transport operations.
SUBSTANCE: invention relates to sea oil extraction platforms. Proposed SPAR platform 200 comprises hull 2202 with central hast 204. Air- and watertight partition 210 runs across central shaft to make variable-buoyancy compartment 220 in central shaft. In compliance with some versions, central shaft bottom is exposed in sea, while in compliance with other versions, central shaft bottom is sealed. At least one pipe 224 to house riser 227 runs through partition and said variable-buoyancy compartment. Said pipe has exposed top face to allows drainage of water accumulated in central shaft to make air- and watertight seal in joint with bulkhead. In some versions, two or more air- and watertight partitions 206, 208, 210 are arranged across central shaft to form one or more air- and watertight ballast tanks 216, 218 arranged fixed between every adjacent pair of bulkheads.
EFFECT: increased platform buoyancy due to its adjustment by central shaft.
16 cl, 4 dwg
SUBSTANCE: invention relates to sea oil production platforms. Proposed device 10 comprises floating hull 11 with bracing members 12 that may displace vertically relative to hull 11, and shuttle 30 coupled with every bracing member to be moved to deck lower side and to be moved by relevant bracing member 12 between bottom position on hull 11 and top position of platform deck lifting. Method of transfer, mounting and dismantling of sea oil production platform deck is implemented by means of above described device.
EFFECT: operation in shallow and deep waters.
22 cl, 12 dwg
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.