Sea gravity platform

FIELD: transport.

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.

5 dwg

 

The invention relates to hydraulic construction, namely the marine gravity platforms for the development of oil and gas fields on the continental shelf.

Known offshore ice-resistant fixed platform, described in patent RU 2151842 C1, CL E02B 17/00, E02B 15/02, publ. 27.06.2000 containing the caisson and steel skirt at the bottom.

The disadvantage of this platform is rigid attachment of the skirt to the bottom support plate, leading to increased precipitation platform afloat and increase towing resistance when moving sea. Stationary skirt also restricts the use of platforms in shallow waters and requires a deeper fairway when posting on the installation point.

Also known gravitational platform A.S. 1492793 A1, CL E02B 17/00, publ. 22.06.87, including the case with the supporting unit, provided in the lower part of the skirt in the form of edges with the Shoe and clip.

The disadvantage of this platform is the need for full or partial replacement of the skirt when the moving platform to another point of operation, as well as increased precipitation afloat, which limits the use of the platform in shallow water and requires a deeper fairway when posting on the installation point.

Known offshore gravity platform A.S. 1515801 A1, CL E02B 17/00, publ. 01.12.86. The platform contains pogrujen the e base, the perimeter of which are removable skirt from separate sections, each of which includes a vertical wall, a horizontal shelf with counterweight and ribs.

The disadvantage of this platform is the need for complex and time-consuming operations institution skirt under the reference base (marine), the difficulty of holding the skirt in the vertical operating position with its penetration into the soil; and the need for additional costs for removing the skirt from the bottom or the making of a new skirt in the case of relocation of the platform.

Offshore gravity platform, AS described in 1515801, is the closest analogue of the claimed platforms.

The present invention is the creation of offshore gravity platform with high resistance on the ground, a small draught afloat, and short installation time on site.

The specified technical task is solved in that offshore gravity platform contains a submersible base formed by the bottom and top base plate, side walls and internal bulkheads. Submersible basis, in its lower part, is reclining on the swivel hinges skirt from separate sections. Each section of the skirt includes a vertical wall, ribs and guide tubes, loc is defined in the plane of the ribs to install finger-latches. Ribs in the area of the junction to the bottom plate is made with the support elements. The side walls submersible grounds contain niches, in which are located the fingers, clamps, and fasteners skirts in the transport position of the platform.

The technical result from the use of the invention is to improve platform stability on the ground, maintaining low precipitation afloat, the lower of towing resistance when moving by sea, as well as reducing the time required to install the platform at the point of operation and dismantling in case of relocation.

Figure 1 shows the platform installed in working position skirt, cross section, figure 2 - section of the skirt in the transport position, the cross-section, figure 3 is the same, front view, figure 4 - node A (the section of the skirt in position, the cross-section), 5 is the same, front view.

Offshore gravity platform contains a submersible base 1 formed by a bottom 2 and top 3 of the base plate, side walls 4 with the vertical sections at the bottom, and internal bulkheads 5. Around the bottom part of the dip base 1 is the skirt 6, connected with him by turning lugs 7, consisting of separate sections 8 (see figure 1). Each section of the skirt 8 has a vertical wall 9, the ribs 10 and healthy lifestyles is marijuana pipe 11. The ribs 10 in the area of the junction to the bottom plate 2 of the immersion of the substrate 1 provided with support elements 12. The vertical sections of the side walls 4 of the immersion of the substrate 1 are niches 13. In the niches 13 posted by means of straps 14 fingers-clamps 15 for fixing sections of the skirt 8 in the working position. On the side walls 4 of the immersion of the base 1 are the fastening elements 16 sections of the skirt 8 in the transport position.

The device operates as follows.

Made a platform containing a submersible base 1 formed by a bottom 2 and top 3 of the base plate, side walls 4 and internal bulkheads 5 skirt 6 on the perimeter of the base, tow to the installation site. When towing skirt 6, consisting of sections 8, fixed by fastening elements 16 of the side walls 4 of the immersion of the substrate 1 in the transport position. The fingers of the clamps 15 are arranged in the recesses 13 of the side walls 4 in a suspended state by means of straps 14 (see figure 2, 3).

Upon arrival at the place of installation of the platform mounting elements 16 disconnect and section skirt 8 on the rotary hinges 7 under its own weight back into position, turning at 180 degrees. After that, the lines 14 release and fingers-clamps 15 of NIS 13 are lowered into the guide pipe 11 sections of the skirt 8. Thus, the fixing skirt 6 in RA is ochem position (see Fig 4, 5). The framework then takes the ballast and sinks to the bottom, pressing his weight skirt 6 in the ground. To increase the overall rigidity of the skirt 6 in the working position on the vertical walls of the 9 sections of the skirt 8 is provided with ribs 10. For distribution of concentrated loads at the contact of the ribs 10 of the skirt 6 of the bottom plate 2, the ribs 10 provided by the supporting elements 12.

If necessary, moving the platform to a new site its deballasting and it POPs up. When afloat, the skirt 6 is extracted from the seabed substrate, after which the fingers of the clamps 15 pull cords 14 of the guide pipes 11 sections of the skirt 8. Then lifting the platform section of the skirt 8 on the rotary hinges 7 turn 180 degrees and fixed by fastening elements 16 on the side walls 4 of the immersion of the substrate 1 in the transport position. Capture sections of the skirt 8 to implement turn produce the free edge of the vertical wall 9. The platform is towed to a new location.

The proposed construction of offshore gravity platform allows you to:

- to reduce the draught of the platform afloat and to reduce the magnitude of the towing resistance due to folding (folding) design skirts;

- apply a skirt with greater height that ways who contributes to the stability of the platform on the ground;

- perform installation and removal of the platform in the shortest possible time.

Offshore gravity platform containing a submersible base formed by the bottom and top base plate, side walls and interior partition walls, around the bottom part of which lies skirt, consisting of separate sections, made in the form of vertical walls with ribs, wherein the skirt is connected with submersible base by a swivel hinge with the possibility of pivoting on a vertical wall in the plane of the ribs is provided by guide tubes, ribs in the area of the junction to the bottom plate submersible Foundation provided support elements, and on the side walls of the immersion of the base is produced niches with fingers-clamps and fasteners skirt in the transport position of the platform.



 

Same patents:

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

FIELD: machine building.

SUBSTANCE: invention refers to elastic sliding bearing used in supports of large-size, heavy and rotating elements, and can be used for example in tower support aboard the ship, hoisting crane, bridge, etc., where external actions have high dynamic loads on bearings. Elastic bearing (1) includes support surface (12) connected to bearing insert installed in housing (2) with central axis (11). Bearing has the possibility of absorbing loads acting on support surface (12). Bearing insert includes means (4, 5, 6, 7) of subsequent absorption of loads acting on bearing (1). The above means include along housing (2) axis(11) two or more elastic elements (4) with various elasticity moduli, which are installed in housing (2) with possibility of arranging between them and along axis (11) at least one insert (5), as well as include element (7) transferring the force and installed between surface (12) and elements (4). The side of element (7), which is directed from surface (12), has surface made in the form of some part of sphere, which is adjacent to mating surface of restricting body (6), by means of which the possibility of inclination or angular deflection of surface (12) is provided relative to axis (11) without corresponding angular deflection of elements (4). Body (6) stops compression of element (4) and consists at least of one element installed between surface (12) and insert (5). Body (6) restricts movement of surface (12) and insert (5) opposite each other. Also, method of routine repair and maintenance of the device is proposed.

EFFECT: creation of bearing design capable of receiving both common and high varying loads, and which is less subject to wear of support surfaces, as well as easy manufacture and maintenance and routine repair.

13 cl, 4 dwg

Fpso platform // 2441129

FIELD: oil-and-gas production.

SUBSTANCE: proposed platform comprises driven drilling outfit, platform deck, lifting crane, auxiliary unit (tender plant), drilling tube, well shaft, well foundation, underwater equipment actuating fluid and gas flow rate devices, manifolds, underwater flowlines, locks, and underwater control system. Drilling tube is equipped with protective envelopment to be locked on platform deck and at well foundation which is made up of chemically stable and water resistant light-protection and load-bearing layers and is provided with hoses furnished with inlet valves arranged along the length of said protective envelopment and connected with mobile elastic reservoirs. Note here that remote-control in-tube pig is arranged in drilling tube top section, in interceptor.

EFFECT: preventing oil spillage in emergent conditions.

2 dwg

FIELD: oil and gas production.

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EFFECT: reduced emissions to environment.

3 cl, 5 dwg

FIELD: oil and gas production.

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4 cl, 3 dwg

FIELD: oil and gas production.

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EFFECT: reduced labour intensiveness for transportation and maintenance of drilling rig during operation.

4 cl, 5 dwg

FIELD: oil and gas production.

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6 cl, 4 dwg, 1 ex

FIELD: supports for the drilling machines, particularly adapted for underwater well drilling.

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2 cl, 3 dwg

FIELD: drilling, particularly underwater drilling.

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EFFECT: extended functional capabilities.

4 cl, 7 dwg

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5 cl, 5 dwg

FIELD: construction.

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3 cl, 3 dwg

FIELD: construction.

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24 cl, 12 dwg

FIELD: construction.

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7 cl, 1 ex, 1 tbl, 6 dwg

FIELD: construction.

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.

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4 dwg

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

FIELD: construction.

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

FIELD: construction.

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.

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EFFECT: practically feasible installation, decreased labor input and material input.

2 cl, 9 dwg, 1 ex

FIELD: construction.

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

FIELD: construction.

SUBSTANCE: shoe comprises a body and a unit of shoe attachment to a support pillar. It has zero or positive buoyancy and is arranged as capable of changing zero or positive buoyancy to buoyancy of a low negative value. The shoe body comprises a hole for stretching of a support pillar, besides, the specified hole is arranged in the centre of the shoe and comprises vertical guide slots for interaction with racks of the support pillar. The unit of shoe attachment to the support pillar comprises two stops, every of which is equipped with a guide sleeve placed in a body, a sliding block installed in the guide sleeve, and a manual drive to move the block in the guide sleeve.

EFFECT: simplified assembly of a shoe to a pillar.

11 cl, 5 dwg

FIELD: transport.

SUBSTANCE: invention relates to floating platforms. Floating platform for waters with ice comprises gull with outer sidewalls and metalling device. Hull is symmetric about platform vertical central axis and is closed at lower part by bottom. Platform draft is notably smaller than platform diameter. Platform floatability centre for its submerged part is located lower than centre of gravity of the platform. Said symmetric outer side of the hull includes at least three sections: water level section, cylindrical mid section and bottom section. Water level section features diameter decreasing downward along central axis. In operation in waters with ice, sea water level is located in water level section. Bottom section features diameter increasing downward along central axis. Metalling device serves for selective raise or descent of the platform so that water level is located nearby water level section or in mid section. Proposed method comprises actuating aforesaid metalling device for selective raise or descent of the platform depending on whether the platform is in water with ice or without it.

EFFECT: minor damages caused by ice.

9 cl, 4 dwg

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