RU2361039C2 - Method for erection of multi-support technological platform - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention is related to construction and operation of offshore technological platforms. Method, in which base is installed on support part arranged in the form of support plate, support plate is rigidly connected to hard ground with the help of cemented piles, base is fixed to support part with the help of anchor power joints, process wells with wellhead connectors are installed in central part of base. Base is arranged in the form of multi-support rod system, every rod support of which is made of rod space modules, space rod modules are connected to each other, to support plate and horizontal platform with the help of quick-split connections in accordance with specified height, process equipment is installed on horizontal platform directly or with the help of semi-submerged module.

EFFECT: increased reliability and speed of offshore platforms erection.

5 cl, 7 dwg

Description

The invention relates to the development of mineral deposits, mainly liquid and gaseous, to the construction of technological platforms with a wide range of external conditions and characteristics of surface soils, with a wide range of depths in the construction of offshore technological complexes.

A technical solution is known in which the base of the platform is made of two parts, the upper part together with the semi-submerged base of the horizontal platform with technological equipment having the ability to disconnect and withdraw from the lower part in the case of the movement of the iceberg / 1 /.

However, the problem of increasing the manufacturability of manufacturing the modules included in the offshore platform and increasing the efficiency of the construction and operation of the complex as a whole is not being solved.

The invention is known, according to which a method of assembling on the ground the support block of a marine stationary platform from separate spatial core sections / 2 / is implemented.

The specified invention does not solve the problem of reliable fastening of the support block to the ground, which does not ensure reliable operation of the offshore platform.

There is a known method of constructing an offshore platform in which a support block is constructed with an upper and lower base plate, between which a monolithic caisson shell is constructed, the walls of which interact with a thick ice cover and presumably with icebergs, support columns are placed inside the caisson on which a deck with technological equipment is installed / 3 /.

The well-known technical solution allows you to build platforms for mining on the shelf of the seas, interacting with a thick ice cover, but does not solve the problem of seismic stability, and also does not solve the problem of reliable interaction with icebergs, because it is gravitational in design and, in essence, does not provide rigid communication of the offshore platform with the ground. In addition, the task of unifying technological modules during the construction of platforms is not being solved.

A known method of constructing an offshore platform in which a base body is mounted on a support part in the form of a support plate, the support plate is rigidly connected to hard ground using cemented piles, and the base is attached to the support part using anchor power connections, moreover, in the central part the bases have technological wells with wellhead connectors / 4 - prototype /.

Moreover, in one of the options for the construction of the offshore platform, it is envisaged that the base be made of two modules, the upper of which is removable, i.e. there is the possibility of disconnecting the body of the semi-submerged base with technological equipment and diverting afloat to the coastal base during the movement of a powerful ice cover, for example, in the case of ensuring seasonal mining.

The known technical solution allows to increase the reliability of the operation of the technological complex. At the same time, it does not address the issue of improving the manufacturability of manufacturing the modules included in it, increasing the efficiency of the structure and the reliability of the operation of the complex as a whole.

The present invention is directed to solving the problem of economic efficiency of the construction of offshore technological platforms by ensuring the unification of technological modules during the construction of the base of the platform, increasing the range of depths of their installation with a wide range of changes in external conditions and characteristics of surface soils - flooded soils in estuaries, marshy soils in mid latitudes or in permafrost, as well as on sandy loose soils with a variable surface topography and in southern latitudes with typhoons and tsunamis.

The solution to this problem is achieved by the fact that in the method of constructing a multi-bearing marine platform, in which a base is installed on a support part in the form of a support plate, the support plate is rigidly connected to solid soil using cemented piles, the base is attached to the support part using power anchors connections, technological wells with wellhead connectors are located in the central part of the base, the base is made in the form of a multi-bearing support rod system, each rod support of which is made they are removed from the core spatial modules, the spatial core modules are connected to each other, with base plates and with a horizontal platform using quick disconnect connections in accordance with a given height at which the horizontal platform is installed, technological equipment is installed directly or with the help of a semi-immersed module on the horizontal platform, and the supporting part is performed in the form of a single base plate or from the corresponding base plates for each rod support separately.

In addition, each of the rod spatial modules is made in the form of a multifaceted rod prism, the ribs of which are made of tubular elements in which the tension elements of the anchor joints are located.

When implementing the invention in the northern latitudes, rod supports at sea level are provided with individual metal aprons or a common metal apron for interaction with the ice sheet.

In this case, the rod supports are arranged in plan with the central and peripheral bearing rod supports, and the technological wells are located in the respective guides of the central rod support.

In extreme conditions, the base is disconnected from the base plate and diverted to the shore base, wellhead well connectors are closed with a protective cover and hydraulically connected to the pumping station or compressor station of the central platform or shore base.

The base is made of two parts - an underwater module, a semi-submerged module with technological equipment is installed on the underwater module, which are interconnected by quick-disconnect connections to ensure disconnection and withdrawal of the semi-submerged base module with technological equipment to the coastal base during extreme weather conditions.

At increased depths, the base of the platform is made by the serial connection of three parts - the underwater part, the intermediate part and the semi-submerged module with technological equipment, which are connected in series with each other using quick disconnect connections, with the possibility of disconnection and departure to the coastal base during extreme conditions of the semi-submerged platform base module with technological equipment separately or together with the intermediate module of the platform base.

The invention is illustrated by the drawings shown in figures 1-7.

Figure 1 shows an offshore platform for shallow depths (up to 50 m) with a multi-support rod base and a common base plate.

Figure 2 - offshore platform with individual base plates for each rod support and with individual anti-ice protective aprons.

In Fig.3 - the same as in Fig.2, but with a common anti-ice protective apron.

Figure 4 is a variant of the location of the rod supports in the plan.

Figure 5 is a variant of the sealing of wells during removal and movement of technological equipment and rod supports.

In Fig.6: Fig.6a is a sea platform for medium depths (up to 150 m) with a stationary underwater part of the base, Fig.6b is a removable upper part of the base, made in the form of a semi-submersible platform with technological equipment, for passing a powerful ice cover.

In Fig. 7: Fig. 7a is an offshore platform with an increased installation depth (up to 350 m), Fig. 7b is a removable upper part of the base, and Fig. 7c is a removable upper and intermediate parts of the base to allow passage of powerful ice cover and icebergs.

The multi-support offshore platform in the general case (Figs. 1-4) comprises a base plate 1, a base 2. The base plate 1 is rigidly connected to solid soil using cemented piles 3, while the base 2 is attached to the base plate 1 using anchor power connections 4 In the central part of the base 2 are located technological wells 5 with wellhead connectors 6.

In the present invention, the base 2 is made in the form of a multi-support rod system, each rod support 7 of which consists of rod spatial modules 8. The spatial rod modules 8 are interconnected, with base plates 1 and with a horizontal platform 9 using quick disconnect connections 10 in accordance with a given tall. A horizontal platform 9 is located on the rod supports 7. Technological equipment 12 is installed directly on the horizontal platform 9 (Figs. 1-3) or with the help of a semi-submerged module 11 (Figs. 6-7). The base part is made in the form of a single base plate 1 (Fig. .1) or from the corresponding base plates 1 (Fig.2-3) for each rod support 7 separately.

Each of the rod spatial modules 8 is made in the form of a multifaceted rod prism, the ribs of which are made of tube elements 13 in which the tension elements of the anchor joints 4 are located. Different types of rod prisms can be used in different designs, the number of faces of which is determined in each case in accordance with the required strength characteristics of the device.

To interact with the ice cover, the rod supports 7 at sea level can be equipped with individual metal aprons 17 or a common metal apron 18.

The rod supports 7 (Fig. 4) are arranged in plan with the central and peripheral bearing rod supports, and the production wells 5 are located in the respective guides 14 of the central rod support. The configuration of the location of the rod supports in the plan may vary depending on the requirements of external conditions.

The invention, in particular, may provide for periodic operation of the offshore platform depending on external conditions both in the northern latitudes with the presence of ice and icebergs, and in the southern latitudes with typhoons and tsunamis.

Under such extreme conditions, the base 2 with a horizontal platform 9 and technological equipment 12 has the ability to disconnect from the base plate 1 and its withdrawal to the coastal base. Wellhead connectors 6 of the wells 5 are closed with a protective casing 15 and hydraulically connected using the corresponding pipelines 16 to the pumping or compressor station of the central platform or shore base (Fig. 5).

In some embodiments of the proposed method, the base 2 may contain two parts (figa) - the underwater part 19 and the semi-submerged module 11 with processing equipment 12, which is located on the underwater part. The underwater part 19 and the semi-submerged module 11 are interconnected by quick-disconnect couplings 10 to ensure disconnection and withdrawal of the semi-submerged module 11 of the base 2 with technological equipment 12 (Fig.6b) to the coastal base during extreme weather conditions.

With increased depths, the base of the platform contains three parts (Fig. 7a) - an underwater module 19, an intermediate module 20 and a semi-submerged module 11 with technological equipment 12, which are connected in series using quick-connect couplings 9. These quick-connect couplings allow disconnection and withdrawal to coastal base during extreme conditions of the semi-submerged module 11 of the base of the platform with technological equipment 12 separately (figb) or in conjunction with the intermediate module 20 Hovhan platform (7B).

The method is implemented as follows.

On the supporting part (Figs. 1-3), made in the form of a base plate 1, a base 2 is installed, the base plate 1 is rigidly connected to solid soil using cemented piles 3, the base 2 is attached to the supporting part using anchor power connections 4, in technological wells 5 with wellhead connectors 6 are located in the central part of the base 2, and the base 2 is made in the form of a multi-support rod system, each rod support 7 of which is made of rod spatial modules 8, spatial rod modules 8 are connected with each other, with base plates 1 and with a horizontal platform 9 using quick disconnect connections 10 in accordance with a given height, technological equipment 12 is installed directly or using a semi-immersed module 11 on a horizontal platform 9, and the supporting part is made in the form of a single base plate or corresponding base plates 1 for each rod support 7 separately.

In addition, each of the rod spatial modules 8 is made in the form of a multifaceted rod prism, the ribs of which are made of tube elements 13, in which the tension elements of the anchor joints 4 are located.

Under moderate ice conditions, the rod supports 7 at sea level provide individual metal aprons 14 (figure 2) or a common metal apron 15 (figure 3) for interaction with the ice cover.

The rod supports 7 in the plan (Fig. 4) are arranged with the central and peripheral bearing rod supports, and the technological wells 5 are located in the respective guides 16 of the central rod support 7.

In extreme conditions, the base 2 is disconnected from the base plate 1 and taken to the coastal base, the wellhead connectors 6 of the wells 5 are closed with a protective casing 17 and hydraulically connected using the corresponding pipelines 18 to the pumping or compressor station of the central platform or the coastal base.

In some embodiments (Fig. 6a), the base is made up of two parts - an underwater module 19 and a semi-submerged module 11 with processing equipment 12, which is installed on the module 19. The parts are interconnected by quick disconnect connections 10 to ensure disconnection and withdrawal of the semi-submerged module 11 (Fig. 6b) foundations with technological equipment (12) to the coastal base during extreme weather conditions.

For relatively large depths (Fig. 7a), the base of the platform is made by connecting three parts in series - an underwater module 19, an intermediate module 20 and a semi-submerged module 11 with technological equipment 12, which are connected in series using quick-disconnect connections 10, allowing disconnection and withdrawal to coastal base during extreme conditions of the semi-submerged module 11 of the base of the platform with technological equipment 12 separately (figb) or together with the intermediate module 20 of the base of platform 2 (Fig. 7c).

The implementation of this invention, taking into account the use of the small-module construction of the large-module parts of the base of the offshore platform, allows to increase the efficiency while maintaining the reliability of the construction of technological platforms in a wide range of external conditions and characteristics of surface soils, flood soils in river mouths, marshy soils in mid-latitudes or in permafrost, on sandy loose soils with a variable surface topography, as well as with a wide range of depths during construction The majority of offshore platforms both in the northern and southern latitudes.

Information sources

1. RF patent No. 2238365, cl. ЕВВ 17/00, publ. 2005.

2. USSR Author's Certificate No. 1126663, class ЕВВ 17/00, publ. 1982.

3. Application of France No. 2615217, CL EBB 17/00, 1988.

4. RF patent №2280128, CL ЕВВ 17/00, publ. 2006 - prototype.

Claims (5)

1. A method of constructing a multi-support offshore platform, in which a base (2) is mounted on a support part made in the form of a support plate (2), the support plate (1) is rigidly connected to solid soil using cemented piles (3), the base (2 ) are attached to the supporting part using anchor power connections (4), in the central part of the base (2) are technological wells (5) with wellhead connectors (6), characterized in that the base (2) is made in the form of a multi-support rod system, each rod support (7) which is made of st spatial spatial modules (8), spatial core modules (8) are connected to each other, with a base plate (1) and with a horizontal platform (9) using quick disconnect connections (10) in accordance with a given height, on a horizontal platform (9) directly or with the help of a semi-submerged module (11), technological equipment (12) is installed. 2. The method of constructing an offshore platform according to claim 1, characterized in that each of the spatial rod modules (8) is made in the form of a multifaceted rod prism, the ribs of which are made of tube elements (13), in which the tension elements of the anchor power connections are located (4 ) 3. The method of constructing an offshore platform according to claim 1, characterized in that the rod supports (7) at sea level are provided with individual metal aprons (14) or a common metal apron (15) for interaction with the ice sheet. 4. The method of constructing an offshore platform according to claim 1, characterized in that the rod supports (7) are arranged in plan with central and peripheral bearing rod supports (7), and the production wells (5) are located in the respective guides (16) of the central rod support . 5. The method according to any one of claims 1 to 4, characterized in that under extreme conditions disconnect the base (2) from the base plate (1) and take it to the shore base, wellhead connectors (6) of the wells (5) are closed with a protective casing ( 17) and are hydraulically connected via appropriate pipelines (18) to the pumping or compressor station of the central platform or coastal base.

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