Method for fixed marine platform assemblage and mounting

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

 

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

Known methods of Assembly and offshore installation of fixed offshore platforms installation and pile fastening support part and installation of topside modules using a crane vessel /1/.

The disadvantage of such known methods is considerable duration of installation and Assembly operations in the sea with large costs of floating technical means involved in offshore operations.

There are also known methods and offshore installation of fixed offshore platforms using new crane vessels heavy-duty trucks and new techniques for the construction of significantly reducing the construction time and, consequently, reduce capital costs /2/.

The disadvantage of this method is relatively more installation and Assembly operations where the use of energy-intensive equipment with a low percentage of its use of power.

It is also known the method of installation complete-block method with pre-Assembly of fixed offshore platforms, which form an Assembly unit for assembling the Assembly site - support unit, the carrier deck and block-modules top the th structure, dock floating vehicle with installation and Assembly area, installing an Assembly unit on the building berth of the truck, move the Assembly unit with mounting and Assembly on site transportation floating craft using the stacker trucks, transported to the installation site and provide consistent installation using a crane and erection of vessels /3 - prototype/.

Known technical solution provides installation and reliable transport of mounting blocks mounting Assembly sites on the carrier. However, it does not address fully the problem of marine mounting Assembly units.

The aim of the invention is to increase the efficiency of utilization of construction equipment and floating technical resources, reduce construction time, the decline of marine operations and labor, the reduction of costs for the construction of fixed offshore platforms.

This goal is achieved by the fact that implemented method of Assembly and offshore installation of the complete-block method with pre-Assembly of fixed offshore platforms, which form an Assembly unit for assembling the Assembly site - support unit, the carrier deck and block-modules of the upper structure, floating dock vehicle with installation and Assembly pad, set of placentas is positive Assembly unit on the building berth of the truck, move Assembly unit with mounting and Assembly on site transportation floating craft using the stacker trucks, transported to the installation site and provide consistent installation using a crane and erection of vessels, and serial mounting Assembly units on the site of the sea is carried out in the following order: install on pre-prepared ground support unit, carry out the installation of piles in corresponding guides of the support block, piling and cementing with the formation of pile Foundation, pre-made on the support block, struts and uneven installation guide pins set the carrier deck, which perform respective seats for the pins and struts, and docking carry out successive pair of the above-mentioned pins and their respective seats.

Struts connection of the jacket and topsides perform as a single unit with the control unit as an Assembly unit, and the length of their perform with an allowance, which is determined from the conditions, a deviation of the vertical axis of the support block when it is set on the ground and the maximum deviation of the plane of the support surfaces of the upper structure from the horizontal.

In addition, the transfer from the horizontal to the vertical position of the piles and the installation of piles in the guides of the support block is performed with the help of two cranes, moreover, zastrocky piles is carried out in places that provide them with minimum deflection.

To increase adhesion with cement mortar piles and guides for piles in place of their cementing provide annular projections.

Pile Foundation packer supply devices, and a cavity bounded by piles, rails and packer devices provide input and output pipelines, through which carry out the filling and controlling the filling of said cavity with cement mortar to the desired concentration.

Relevant uneven installation guide pins carried out on the upper surface of the carrier deck, which set the modules of the upper structure, and the weight and dimensions of the modules are chosen from matching the maximum technical characteristics of hoisting devices and crane installation vessel.

The carrier deck and block-modules topside perform as one Assembly unit taking into account the technical characteristics of the lifting equipment crane installation vessel.

The proposed method is illustrated in the drawings as applied to the construction of a double fixed offshore platforms, presented in figure 1-17.

Figure 1 shows a General view of a marine platform, broken down into Assembly units; figure 2 - option run the AI with the outer annular projections; figure 3 - option of the skirt guides with internal annular projections and packer; figure 4 - system piping-supply pipe and control of cement.

Figure 5-7 shows the schematic of the moving Assembly units with installation and Assembly sites on the transport barge anchor block (figure 5), the carrier platform (6) and residential malula (Fig.7); Fig shows a diagram of unloading from a transport barge anchor block fixed offshore platforms figure 9 - installation on the seabed anchor block fixed offshore platform; Fig 10 shows the scheme of conversion of piles from horizontal to vertical position when installed in the basement of the reference block; figure 11 - diagram of the installation of piles in skirt guides the support block; Fig diagram of pile driving hammer into the ground; on Fig diagram grouting the Foundation of the bearing unit with vessel maintenance; Fig - set carrier deck and transitional bridge; Fig - installation residential module; Fig - installation of process modules, Fig - install the lower and upper parts of the rig.

Fixed offshore platform (figure 1) is divided by the proposed method on the Assembly unit: reference unit 1 marine technology platforms that support unit residential module 2, each support block has St the emergency Foundation 3 carrier deck 4. Thrust blocks 1 and 2 are linked by transitional bridge 5. On the carrier deck 4 of the support block 2 is the residential unit 6. On the carrier deck 4 of the reference block 1 are energy module 7, technological modules 8, the base Assembly with the portal and the lower part of the rig 9, the upper part of the rig 10. Pile Foundation 3 contains the skirt guides 11 and piles 12.

To the support block 1 is made struts 13 and uneven mounting pins 14.

Piles 12 provided with external annular projections 15 (2), and the skirt guides 11 provided with an internal annular projections 16 and packer 17 (figure 3).

The complex is equipped by system piping (figure 4). For filling and controlling the filling of cement mortar cavity bounded by the piles 12, skirt guides 11 and packer device 17, the system includes relevant pipelines, and each cavity is equipped with inlet 18 and outlet 19 pipelines. On the first of them - the pipe 18 is supplied cement, and on the second pipe 19 controlled fill the cavity with cement mortar to the desired concentration.

Technological complex (figure 5-7) includes Assembly and mounting platform 20, berth semiprivate truck 21, a transport barge 22, crane installation vessel 23 with lifting valves 24 and 25 (the IG 8-17), when the piling 12 is supplied pile hammer 26 (Fig), the mixer 27 and the pipes 28 grouting, and vessel maintenance 29 which is equipped with a capacity for cement 30 (Fig).

The proposed method is implemented as follows. On the mounting Assembly area 20 form an Assembly unit - supporting blocks 1 and 2, the load-bearing deck 4 and block-modules topside - residential module 6, the energy module 7, technological modules 8, the base Assembly with the portal and the lower part of the rig 9, the upper part of the rig 10.

Join transport with installation and Assembly area 20 (5-7), set sequentially Assembly unit on the building berth semiprivate truck 21, move Assembly unit with the mounting and Assembly of the platform 20 on the transport barge 22 using berth semiprivate trucks 21, transported to the installation site and provide consistent installation using a crane and erection of the vessel 23.

The sequence of installation of units on the site of the sea is carried out in the following order: install on pre-prepared ground support units 1 and 2 (Fig-9), carry out the installation of piles 12 in the skirt guides 11 of the corresponding reference block (11), driving with a pile hammer 26 (Fig) and cement is the formation with the formation of pile Foundation 3 (Fig).

On pre-made on the base unit 1, the struts 13 and uneven installation guide pins 14 set the carrier deck 4, which perform the corresponding seat (not shown) under the guide pins 14 and struts 13, and docking carry out successive pair of the above-mentioned pins 14 and the corresponding seats.

While the struts 13 connection of the jacket and topsides perform as a single unit with the control unit 1 as an Assembly unit, and the length of their perform with an allowance, which is determined from the conditions, a deviation of the vertical axis of the bearing unit 1 when it is set on the ground and the maximum deviation of the plane of the support surfaces of the upper structure from the horizontal.

Translation from the horizontal to the vertical position of the pile 12 is performed with the help of two cranes 24 and 25 by crane and mounting Board 23, and zastrocky pile 12 is carried out in places that provide them with the minimum deflection (figure 10). The installation of piles 12 in the guides 11 of the reference block 1 or 2 is performed with the crane 25 (11), and the piling 12 to a predetermined level is performed using a pile hammer 26 (Fig).

To increase adhesion with cement mortar piles 12 and skirt guides 11 in place of their cementing supply Kohl is avimi ledges 15 and 16, respectively.

Skirt guides 11 pile Foundation packer supply device 17, and a cavity bounded by the piles 12, the guides 11 and packer devices 17 are provided with inlet 18 and outlet 19 pipelines, through which carry out the filling and controlling the filling of said cavity with cement mortar to the desired concentration.

Anchoring piles 12 in the base 3 supporting blocks 1 and 2 (Fig) is performed using cement mortar, which is served with vessel maintenance 29 in the cement mixer 27 and further along the pipeline 28 is sent to the system piping (figure 4) each of the piles 11.

Additionally, the corresponding uneven installation guide pins carried out on the upper surface of the carrier deck 4 (not shown), which set the modules of the upper structure, and the weight and dimensions of the modules are chosen from matching the maximum technical specifications lifting devices - valves 24 and 25 of the crane Assembly of the vessel 23.

In one embodiment of the method the carrier deck 1 and 2 is carried out as one Assembly unit with the unit modules of the upper structure taking into account the technical characteristics of the lifting equipment crane installation vessel 23.

The proposed method can improve the productivity and profitability of the installation of marine stationripper.

Literature

1. Ben Gerwick, associate Professor of engineering of the University of California, Berkeley and a Consultant on marine operations. "Construction of marine structures", new York, 1986).

2. Vyakhirev R.I., B.A. Nikitin, Mirzoev, D.A. "the Construction and development of offshore oil and gas fields". - M.: Publishing house of the Acad. Mining Sciences, 1999.

3. USSR author's certificate No. 1184896, CL E 02 In 17/00, 1983 prototype.

1. The method of Assembly and offshore installation of the complete-block method with pre-Assembly of fixed offshore platforms, which form an Assembly unit for assembling the Assembly site: anchor block, a carrier deck and block-modules of the upper structure, floating dock vehicle with installation and Assembly pad, set sequentially Assembly unit on the building berth of the truck, move the Assembly unit with installation and Assembly areas on a floating vehicle using the stacker trucks, transported to the installation site and provide consistent installation using a crane and erection of vessels, wherein the sequential installation of the units on the site of the sea is carried out in the following order: install on pre-prepared ground support unit, carry out the installation of piles in the appropriate skirt the direction of the bearing support block, their driving and cementing with the formation of pile Foundation, pre-made on the support block, struts and uneven installation guide pins set the carrier deck, which perform respective seats for the pins and struts, and docking carry out successive pair of the above-mentioned pins and their respective seats.

2. The method according to p. 1, characterized in that the struts connection of the jacket and topsides perform as a single unit with the control unit as an Assembly unit, and the length of their perform with an allowance, which is determined from the conditions, a deviation of the vertical axis of the support block when it is set on the ground and the maximum deviation of the plane of the support surfaces of the upper structure from the horizontal.

3. The method according to p. 1, characterized in that the transfer from horizontal to vertical piles and the installation of piles in skirt guides the support block is performed with the help of two cranes, and zastrocky piles is carried out in places that provide them with minimum deflection.

4. The method according to p. 1, characterized in that to increase adhesion with cement mortar piles and skirt guides for piles in place of their cementing provide annular projections.

5. The method according to p. 1, the tives such as those what a pile Foundation packer supply devices, and a cavity bounded by piles, skirt guide and packer devices that provide input and output pipelines, through which carry out the filling and controlling the filling of said cavity with cement mortar to the desired concentration.

6. The method according to p. 1, characterized in that it further relevant uneven installation guide pins carried out on the upper surface of the carrier deck, which set the unit modules of the upper structure, and the weight and dimensions of block modules choose from a condition of maximum compliance with the technical characteristics of hoisting devices and crane installation vessel.

7. The method according to p. 1, characterized in that the carrier deck and block-modules topside perform as one Assembly unit taking into account the technical characteristics of the lifting equipment crane installation vessel.



 

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7 dwg

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

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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

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