Support substructure for permanent offshore platform

FIELD: offshore oil-field hydraulic structures, namely for building fixed platforms.

SUBSTANCE: support substructure comprises three-dimensional latticed structure having prismatic shape and composed of tubular members. The structure has vertical panels with posts, cross-pieces, struts and horizontal diaphragms connected one to another. Horizontal diaphragms have guiding nets for marine risers. The structure is secured to ground by main piles arranged in vertical posts and by foundation having additional piles, which is rigidly connected to tubular members of side edges of above structure. The structure is provided with ice-protection means formed as two truncated prisms of sheet steel and having beveled side ribs rigidly connected one to another by major bases. Marine risers are arranged inside prisms. Each prism of ice-protection means is rigidly connected with tubular members of corresponding diaphragms of three-dimensional latticed structure.

EFFECT: increased resistance to wave, seismic and ice loads, improved manufacturability and, as a result, reduced cost of permanent offshore structure building.

3 cl, 2 dwg

 

The invention relates to the field of construction offshore oil hydraulic structures, in particular to the construction of fixed offshore platforms.

Known design all-welded metal jacket pile ice-resistant platform, containing a cylindrical cap with a widening of the upper part of the seat upper support structure, the ice-cutter, located under the head and consisting of upper and lower conical sections connected between a large base, base, located under the ice-cutter and consists of a conical shell with a large base at the bottom and the bottom with holes for communications conductors for mounting piles located inside the reference block and diverging downward along the conical shell base [1].

Known technical solution is designed to be installed in the waters of the sea with a powerful ice cover and the average level of seismicity and is a combination of pile and gravity types of offshore platforms.

The disadvantage of this solution is too great weight, great intensity, great work with the platform installation and construction costs in General.

Known technical solution, in which the reference block is a spatial lattice structure, such as a pyramidal shape with g what she each of which is made in the form of panels, the inner space of the lattice structure is designed to position the hollow riser columns, lattice frame consists of a tubular element, which is attached to the ground using a modular pile Foundation, each module consists of two posts with cement retained piles, and support columns are rigidly connected with each other and with spatial truss design [2].

The use of this technical solution is appropriate in fields with low seismic activity and the absence of ice cover. A disadvantage of the known technical solution is the absence of piles located directly at the terminals of the spatial grid, which reduces the resistance of the platform shift, as well as the lack of funds that provide protection from ice.

The known reference block of fixed offshore platforms, containing spatial grid structure prismatic shape of the tube elements, consisting of interconnected vertical panels to supports, struts, braces and horizontal diaphragms with guide bars for riser columns and fastened to the ground using a pile [3 - prototype].

The present invention is directed is and the solution to the problem of increasing the reliability of the counter-wave, seismic and ice loads, and improve manufacturability, optimization of metal and, as a consequence, reduce cost in the construction of fixed offshore platforms.

This technical result is achieved in that the supporting block fixed offshore platform contains a spatial grid structure prismatic shape of the tube elements, consisting of interconnected vertical panels to supports, struts, braces and horizontal diaphragms with guide bars for riser columns and fastened to the ground with piles, in addition, the spatial lattice design of prismatic form is attached to the ground using the main piles located in the vertical posts, and using a Foundation with additional piles, which is rigidly connected with the tubular elements of the lateral faces of the spatial lattice structure, the latter being provided with lesasilny device made in the form of two truncated prisms of sheet steel with beveled side edges rigidly connected big reason among themselves, within the prisms are riser columns, and each of these prisms leasemanager device is rigidly connected to the tubular elements of the respective diaphragms spatial sieves the ATA design.

In addition, the spatial lattice design of prismatic form contains three panels, which are interconnected by the connecting elements and horizontally spaced apertures.

Foundation with additional piles made multimodal, each pile module contains vertically located, is made of sheet metal protective skirt on the sides of which are rigidly associated with it two guides for additional piles, and each rail is rigidly connected with the side edges of the spatial lattice structure of prismatic shape corresponding connecting elements.

The invention is illustrated by drawings, figure 1-2.

Figure 1 shows the basic block.

Figure 2 - top view figure 1.

Anchor block fixed offshore platform contains a spatial grid structure prismatic form 1 of the tube elements, consisting of panels with 2 vertical posts 3, interconnected struts and braces (see figure 1). In the meshed design of prismatic form 1 are guide vanes for riser columns 4. Lattice design of prismatic form 1 consists of a tube elements and is attached to the ground using the main piles 5, located in the vertical stand is Ah 3.

Lattice design of prismatic form 1 is equipped with lesasilny device 6 made in the form of two truncated prisms of sheet steel with beveled side edges rigidly connected big reason among themselves, within the above-mentioned prisms are riser column 4. Each of the truncated prisms leasemanager device 6 is rigidly connected to the tubular elements of the respective horizontal diaphragms 7. Lattice design of prismatic form 1 provided the Foundation with additional hardening piles 8, which is rigidly connected with the tubular elements of the lateral faces of the spatial lattice structure of prismatic form 1.

Lattice design of prismatic form 1 contains three panels 2 connected to the connecting tubular elements 9 and horizontally spaced apertures 7.

Foundation with additional piles 8 is made of a multi-module, with each pile module 10 includes a vertically located, is made of sheet metal protective skirt 11, the sides of which are rigidly related to the two guides 12 for additional piles 8, each rail 12 is rigidly connected with the side edges of the spatial lattice structure of prismatic form 1 corresponding connecting elements is 13.

The orientation of the spatial lattice structure of prismatic form 1 is selected as providing the lowest wave loads and loads from possible interaction with ice, and the location of the planes protective skirts pile 11 of the module 10 and the size of the holes formed in the protective skirts 11 and the connecting elements 13 each pile of module 10, is chosen from the condition of the smallest surface erosion of the bottom of the sea.

Anchor block fixed offshore platform according to the invention allows to increase, according to calculations and model tests, the economic efficiency of the proposed reference block offshore at depths of up to 75 m, to improve technical characteristics of the reference block when exposed to wave, wind, seismic and ice up to 0.5 m loads when installed in temperate latitudes.

Sources of information:

1. RF patent №2089704, CL E 02 In 17/00, publ. 1997

2. As the USSR №1213128, CL E 02 In 17/00, publ. 1986

3. As the USSR №1537750, CL E 02 In 17/00, publ. 1990 - the prototype.

1. Anchor block fixed offshore platforms containing spatial grid structure prismatic shape of the tube elements, consisting of interconnected vertical panels to supports, struts, braces and horizontal diaphragms with the direction of the Commissioner grids for riser columns and fastened to the ground using a pile, characterized in that the spatial lattice design of prismatic form is attached to the ground using the main piles placed in vertical racks, and c by using a Foundation with additional piles, which is rigidly connected with the tubular elements of the lateral faces of the spatial lattice structure, the latter being provided with lesasilny device made in the form of two truncated prisms of sheet steel with beveled side edges rigidly connected big reason among themselves, within the prisms are riser columns, and each of these prisms leasemanager device is rigidly connected to the tubular elements of the respective diaphragms spatial lattice structure.

2. A support block under item 1, characterized in that the spatial lattice design of prismatic form contains three panels, which are interconnected by the connecting elements and horizontally spaced apertures.

3. A support block under item 1, characterized in that Foundation with additional piles made multimodal, each pile module contains vertically located, is made of sheet metal protective skirt on the sides of which are rigidly associated with it two guides for additional piles, and each rail as the TKO is connected with the side edges of the spatial lattice structure of prismatic shape corresponding connecting elements.



 

Same patents:

FIELD: hydraulic engineering, particularly underwater structures adapted for oil and gas well operation, preferably on shallow continental shelf having bottom covered with thick silt layer and in ice-covered period.

SUBSTANCE: platform comprises base, vertical pile holders connected with the base and positioning unit for drilling string and well-control equipment fixation. Base is formed as a structure with cavities filled with ballast. The structure is composed of hollow members and functionally divided into two areas. Positioning unit is arranged in the first area, another area including catching opening. Platform is additionally provided with removable mounting frame with production equipment installed on the frame. Arranged in lower frame part are inclined guiding means to provide access into catching opening during mounting frame connection with support platform base in underwater position.

EFFECT: reduced labor inputs for production equipment mounting and maintenance, increased reliability.

7 dwg

FIELD: production of ice.

SUBSTANCE: method comprises producing a hollow near the ship's side, delivering air under the ice cover, the air volume does not exceeding the volume of the space defined by ice covering from the top, water from the bottom, and ice walls from the sides over the contour of the future hollow. The walls are frozen from top to bottom by means of direct nonseparable heat exchangers mounted in advance into the covering immediately behind the contour up to the bottom of the future hollow. The delivery stops and the bottom of the future hollow is frozen with the use of L-shaped nonseparable heat exchangers set into the covering simultaneously with the direct heat exchangers. As a result, a closed space is defined, which is stripped, and ice blocks are removed.

EFFECT: enhanced efficiency.

FIELD: hydraulic engineering, particularly for forming temporary structures for enclosing closed in plane water area bottom part and space above the bottom part through the full water thickness.

SUBSTANCE: method of shallow tunnel construction involves forming structure enclosing closed in plane bottom part; removing water from the structure; performing works in dry structure and demounting above structure. Method of enclosing structure forming involves producing bottomless hydraulic enclosure with controlled floatability; transporting and moving thereof to tunnel path; immersing the enclosure in water up to reaching water area bottom by reducing floatability thereof and fixing enclosure with fastening means and anchor system; leveling upper enclosure part with horizon line and arranging cranage and platforms for building material storage on upper enclosure part; erecting cutoff walls inside space defined by enclosure; removing water from the enclosure; developing bottom ground by trench digging; constructing pile tunnel base; building foundation grill on pile tunnel base; locating composite or precast reinforced concrete tunnel sections on foundation grill; recovering initial floatability of the enclosure. Enclosure structure has movable fastening means formed as blades along vertical walls thereof.

EFFECT: increased tunnel reliability, reduced time of erection thereof.

4 cl, 4 dwg

FIELD: stationary sea oil platforms.

SUBSTANCE: block has underwater support, made in form of two-level bench, formed by vertical beam cases and horizontal links, and also has support columns, connected to support. Horizontal links of bench are made in form of floating tanks, while links, placed along perimeter of lower level of bench, are separated by water-impenetrable walls on sections, provided with ballasting means. Method for mounting support block at the bottom of continental shelf includes transporting, ballasting of floating tanks and fixing support block at the bottom of water body. Support block is transported into wells drilling zone in planned position, sections of floating tanks are ballasted until lower level of support lowers into bottom of water body for 0.3-0.7 of its height, different and slants are evened and holding beams are inserted into cases of support with their following forcing into hard bottom portion and fixing in cases. Ballasting of sections of floating tanks and forcing of holding beams can be performed in pairs in diagonal planes relatively to center of lower level of support.

EFFECT: simplified assemblage, higher reliability.

2 cl, 12 dwg

FIELD: hydraulic engineering, particularly building bases and foundations, namely bridge piers, in water.

SUBSTANCE: method involves monitoring water obstacle in support building place, including investigating water parameters, recording water level in the course of year, determining floor shape, investigating floor ground, influence of outer disturbing forces and calculating weight and dimensions of support foundation case on the base of above parameters; producing hollow case with several cavities; moving case to installation place; submerging case in water; pacing thereof on floor; fixing case by piles and smoothing floor. Case submerging and placing operations are performed simultaneously with stabilizing vertical case position by performing control and filling of corresponding cavities. Bottom smoothing process is carried out by forcing artificial material, such as concrete layers with crushed stone interlayers, under case bottom. During case placing case is secured by blades built in case bottom and by piles inserted in cavities. Correspondence between case weight, number of blades, head resistance and side friction thereof for particular ground is determined to provide case stability on ground. Upper edge of submerged case is located above maximum possible water wave height. Rock fill is formed around underwater case part.

EFFECT: reduced time of support erection, increased reliability and stability, safety and service life, reduced labor inputs, possibility to erect supports in Arctic basin.

3 cl 1 ex

The invention relates to the development of underwater mineral deposits, namely for the construction of technological systems, which provide carrying out maintenance work on the shelf of the open sea

The invention relates to the field of drilling offshore, in particular to methods of installation drilling monoatomic reason, stabilize them on the bottom and dismantling

The invention relates to the development of underwater mineral deposits, mainly of liquid and gas, the construction of technological systems that provide on the continental shelf the high seas with the ability against ice, and seismic loads

Drilling platform // 2231594
The invention relates to a device for carrying out engineering-geological surveys on the shelf and can be used for drilling operations in shallow water, open water areas

The invention relates to the development of underwater mineral deposits, mainly of liquid and gas, the construction of technological systems, which provide mainly operational, works on the deep shelf seas

FIELD: hydraulic engineering, particularly building bases and foundations, namely bridge piers, in water.

SUBSTANCE: method involves monitoring water obstacle in support building place, including investigating water parameters, recording water level in the course of year, determining floor shape, investigating floor ground, influence of outer disturbing forces and calculating weight and dimensions of support foundation case on the base of above parameters; producing hollow case with several cavities; moving case to installation place; submerging case in water; pacing thereof on floor; fixing case by piles and smoothing floor. Case submerging and placing operations are performed simultaneously with stabilizing vertical case position by performing control and filling of corresponding cavities. Bottom smoothing process is carried out by forcing artificial material, such as concrete layers with crushed stone interlayers, under case bottom. During case placing case is secured by blades built in case bottom and by piles inserted in cavities. Correspondence between case weight, number of blades, head resistance and side friction thereof for particular ground is determined to provide case stability on ground. Upper edge of submerged case is located above maximum possible water wave height. Rock fill is formed around underwater case part.

EFFECT: reduced time of support erection, increased reliability and stability, safety and service life, reduced labor inputs, possibility to erect supports in Arctic basin.

3 cl 1 ex

FIELD: stationary sea oil platforms.

SUBSTANCE: block has underwater support, made in form of two-level bench, formed by vertical beam cases and horizontal links, and also has support columns, connected to support. Horizontal links of bench are made in form of floating tanks, while links, placed along perimeter of lower level of bench, are separated by water-impenetrable walls on sections, provided with ballasting means. Method for mounting support block at the bottom of continental shelf includes transporting, ballasting of floating tanks and fixing support block at the bottom of water body. Support block is transported into wells drilling zone in planned position, sections of floating tanks are ballasted until lower level of support lowers into bottom of water body for 0.3-0.7 of its height, different and slants are evened and holding beams are inserted into cases of support with their following forcing into hard bottom portion and fixing in cases. Ballasting of sections of floating tanks and forcing of holding beams can be performed in pairs in diagonal planes relatively to center of lower level of support.

EFFECT: simplified assemblage, higher reliability.

2 cl, 12 dwg

FIELD: hydraulic engineering, particularly for forming temporary structures for enclosing closed in plane water area bottom part and space above the bottom part through the full water thickness.

SUBSTANCE: method of shallow tunnel construction involves forming structure enclosing closed in plane bottom part; removing water from the structure; performing works in dry structure and demounting above structure. Method of enclosing structure forming involves producing bottomless hydraulic enclosure with controlled floatability; transporting and moving thereof to tunnel path; immersing the enclosure in water up to reaching water area bottom by reducing floatability thereof and fixing enclosure with fastening means and anchor system; leveling upper enclosure part with horizon line and arranging cranage and platforms for building material storage on upper enclosure part; erecting cutoff walls inside space defined by enclosure; removing water from the enclosure; developing bottom ground by trench digging; constructing pile tunnel base; building foundation grill on pile tunnel base; locating composite or precast reinforced concrete tunnel sections on foundation grill; recovering initial floatability of the enclosure. Enclosure structure has movable fastening means formed as blades along vertical walls thereof.

EFFECT: increased tunnel reliability, reduced time of erection thereof.

4 cl, 4 dwg

FIELD: production of ice.

SUBSTANCE: method comprises producing a hollow near the ship's side, delivering air under the ice cover, the air volume does not exceeding the volume of the space defined by ice covering from the top, water from the bottom, and ice walls from the sides over the contour of the future hollow. The walls are frozen from top to bottom by means of direct nonseparable heat exchangers mounted in advance into the covering immediately behind the contour up to the bottom of the future hollow. The delivery stops and the bottom of the future hollow is frozen with the use of L-shaped nonseparable heat exchangers set into the covering simultaneously with the direct heat exchangers. As a result, a closed space is defined, which is stripped, and ice blocks are removed.

EFFECT: enhanced efficiency.

FIELD: hydraulic engineering, particularly underwater structures adapted for oil and gas well operation, preferably on shallow continental shelf having bottom covered with thick silt layer and in ice-covered period.

SUBSTANCE: platform comprises base, vertical pile holders connected with the base and positioning unit for drilling string and well-control equipment fixation. Base is formed as a structure with cavities filled with ballast. The structure is composed of hollow members and functionally divided into two areas. Positioning unit is arranged in the first area, another area including catching opening. Platform is additionally provided with removable mounting frame with production equipment installed on the frame. Arranged in lower frame part are inclined guiding means to provide access into catching opening during mounting frame connection with support platform base in underwater position.

EFFECT: reduced labor inputs for production equipment mounting and maintenance, increased reliability.

7 dwg

FIELD: offshore oil-field hydraulic structures, namely for building fixed platforms.

SUBSTANCE: support substructure comprises three-dimensional latticed structure having prismatic shape and composed of tubular members. The structure has vertical panels with posts, cross-pieces, struts and horizontal diaphragms connected one to another. Horizontal diaphragms have guiding nets for marine risers. The structure is secured to ground by main piles arranged in vertical posts and by foundation having additional piles, which is rigidly connected to tubular members of side edges of above structure. The structure is provided with ice-protection means formed as two truncated prisms of sheet steel and having beveled side ribs rigidly connected one to another by major bases. Marine risers are arranged inside prisms. Each prism of ice-protection means is rigidly connected with tubular members of corresponding diaphragms of three-dimensional latticed structure.

EFFECT: increased resistance to wave, seismic and ice loads, improved manufacturability and, as a result, reduced cost of permanent offshore structure building.

3 cl, 2 dwg

FIELD: offshore oil-field hydraulic structures, namely for building fixed platforms.

SUBSTANCE: method for forming support substructure by welding large blocks involves producing and serially connecting precast members to create flat units, namely panels and diaphragms; connecting flat units by tubular inserts and tubular links to create three-dimensional latticed structure. All operations are divided into four stages in accordance with technological order. The first stage includes forming tubular links and tubular inserts, pile sections and marine riser sections. The second stage includes assemblage of flat panels and diaphragms in horizontal position on corresponding mats. The third and the forth stages include simultaneous installation of flat panels and diaphragms and rigid connection thereof.

EFFECT: reduced labor inputs, time and cost for assembly work performing due to elimination of complicated tubular joints used as assembly units.

3 cl, 7 dwg

FIELD: ground hydraulic structure erection, particularly to decontaminate silt or bottom sediments in water bodies.

SUBSTANCE: method involves building protective dam along perimeter of silt and/or bottom sediment area to be protected; laying waterproofing layer along inner dam perimeter, wherein waterproofing layer height is 2 times as much as silt and/or bottom sediment layer; forming artificial ground massif of watertight ecologically friendly natural ground in water area inside the dam, wherein artificial ground massif thickness is equal to at least three thicknesses of silt and/or bottom sediment layer; forming above-water relief area having 2.5 m height over water surface; forming surface flow discharge system and planting greenery in artificial ground massif.

EFFECT: increased reliability, reduced contamination concentration, prevention of hazardous substances ingress in ambient space and improved ecological safety.

2 cl, 1 dwg

FIELD: marine hydraulic structures, particularly fixed marine oil and gas production platforms.

SUBSTANCE: method for pile installation with the use of handling machine involves driving each pile in conical hole made in guiding means fixedly secured to marine platform base; installing pile and guiding means in coaxial position by guiding device having body installed on guiding members of the base so that the body may be displaced and fixed in predetermined position; lowering pile to working position; installing guiding device above water level on guiding members of platform base in predetermined position, wherein the guiding device is made as cylindrical body part and cylindrical part of guiding member secured one to another and having crossing axes so that cylindrical part of guiding means and cylindrical part of guiding member of guiding device are brought into coaxial state by corresponding linear and angular guiding member displacement; securing guiding device body with guiding members of platform base.

EFFECT: extended technological capabilities and simplified method of pile installation in working position.

5 cl, 4 dwg

FIELD: marine oil production hydraulic structure building, particularly marine platform assemblage.

SUBSTANCE: method involves forming assembly units, namely support unit, load-bearing deck and block units of upper structure, at subassembly site; docking floating vehicle to subassembly site; serially installing assembling units on stockpile carts; moving assembly units from subassembly site to floating vehicle with the use of above stockpile carts; transporting thereof to assemblage site and performing successive mounting thereof with the use of crane-and-mounting ships. The successive mounting operation involves installing support unit on previously prepared ground; installing piles in corresponding bell-shaped guiders of the support unit; driving the piles and cementing thereof to create pile foundation; arranging load-bearing deck on struts and installation guiding bars having different heights and previously formed on support unit, wherein the load-bearing deck has seats for struts and bars receiving and connection thereof is carried out by successive alignment of above bars and seats.

EFFECT: increased efficiency of building equipment and floating vehicle usage; reduced building time, decreased number of operations to be performed at sea, reduced labor inputs and decreased costs of marine fixed platform building.

7 cl, 17 dwg

Up!