RU2363810C1 - Procedure for equipping sea deposit with unified technique - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention refers to construction of platforms for extraction of minerals. The procedure consists in constructing the central and peripheral sea platforms; each platform is constructed with a base plate rigidly tied with solid soil by means of cement piles; a semi-submerged module with process equipment is mounted on the base plate directly or through a foundation with a sunken upper deck; the sea platforms are connected with pipelines and with a coast compressor station. The semi-submerged nodules with process equipment are replaceable, specialised and self-propelled, for example, in form of a catamaran. The specialised semi-submerged modules are replaced accordingly to the process, while the base is made with supports from unified sections connected between them rigidly.

EFFECT: invention increases reliability of equipping deposits of minerals.

6 cl, 6 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, according to which cemented piles are used in the construction of offshore platforms, the length of which is chosen taking into account the overlap of unstable rocks / 1 /.

The specified technical solution has limited application, since the base is quite rigid, while the cemented piles are inclined to the horizon.

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 / 2 /.

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.

A technical solution is also known, according to which a method for arranging an offshore oil and gas field is implemented, in which a central and peripheral offshore platform is built, each platform is made with a base plate, which is rigidly connected to the solid ground with cemented piles, a semi-submerged module is installed on the base plate with technological equipment directly or through the base with a deepened upper deck, offshore platforms are connected by pipelines to each other and to the coastal compressor weed or pump station (10) / 3 - prototype /.

In the indicated technical solution, the use of unified technical means for equipping the technological complex is very limited, in particular when constructing a wide range of offshore platforms in depth, taking into account the topography and natural and climatic conditions, and there is no flexible, economically feasible operation of technological equipment.

The aim of the invention is to increase the reliability and economic efficiency of field development, regardless of climatic conditions.

This goal is achieved by the fact that a method of equipping an offshore field with unified technical means is implemented, in which a central and peripheral offshore platform is built, each platform is made with a base plate, which is rigidly connected to hard ground with cemented piles, and a semi-submerged module with technological equipment is mounted directly on the base plate or through the base with a deepened upper deck, offshore platforms are connected by pipelines to each other and from the coastal compressor or pump station, moreover, semi-submerged modules with technological equipment are interchangeable specialized and self-propelled, for example in the form of a catamaran, specialized semi-submerged modules with technological equipment are replaced in accordance with the technological process, and the base is made with supports from unified sections rigidly interconnected .

At the same time, semi-submerged modules with technological equipment are implemented in the form of a drilling module, a production module - production and control, a module from a compressor or pump station and a major overhaul module.

Moreover, at installation depths of the offshore platform up to 40 m, direct installation of self-propelled semi-submerged modules is carried out on the base plate.

In addition, at installation depths of the offshore platform from 40 to 100 m, each base support is made of separate, rigidly interconnected sections, which are additionally connected to the cemented piles by tension elements, and the corresponding tension devices of the latter are installed on the upper deck.

At installation depths of the offshore platform over 100 m, the base is made with at least one intermediate pontoon device, and the number of unified intermediate pontoon devices and the distance between them are determined by calculation based on the corresponding installation depth.

In the presence of icebergs, the upper deck is equipped with retractable bearings with corresponding drives, which are rigidly connected to the intermediate deck, a removable self-propelled semi-immersed technological module is installed on the last.

The invention is illustrated by the drawings shown in figures 1-6.

Figure 1 shows a General view of the arrangement of the field. Figure 2 is a diagram of the implementation of the offshore platform at depths of up to 40 m, as an option for installing a specialized technological module directly on the base plate. Figure 3 shows an embodiment of an offshore platform at depths of over 40 m. Figure 4 shows a diagram of an offshore platform at depths of over 100 m with one intermediate pontoon. Figure 5 shows a diagram of the implementation of the offshore platform at depths of more than 200 m with two or more intermediate pontoons. Figure 6 shows an embodiment of an offshore platform with a retractable intermediate deck.

Technical means for implementing the method (Fig. 1) include a central 1 and peripheral 2 offshore platforms. The number of peripheral platforms 2 can be any, but the construction of each of them is based on a technological approach, taking into account the use of unified modules.

Each platform contains a base plate 3, which is rigidly connected to the solid ground with cemented piles 4. On the base plate 3, a replaceable self-propelled semi-submerged module 5 is installed with technological equipment 6 directly (Fig.2) or through the base 7 (Fig.3), the level of the top decks 8 of the base 7 are selected from the condition of unhindered passage of the ice field and / or iceberg (Fig.2-5). Offshore platforms 1 and 2 are connected by pipelines 9 to each other and to an onshore compressor or pump station 10.

Semi-immersed process modules 5 are replaceable self-propelled and are installed together with specialized technological equipment 6 on the upper deck 8 of the base 7. The replaceable semisubmersible module 5 is self-propelled, for example, in the form of a catamaran. In this case, the change of specialized technological modules 5 is carried out in accordance with the technological process - drilling, operation (production), and overhaul.

Therefore, the method involves the use of unified interchangeable specialized technological modules 5, which perform the following types: drilling module, production module - production and control, a module from a compressor or pump station and a major overhaul module.

The design of the offshore platform primarily depends on the depth of its installation, in connection with which their implementation in the following options is provided.

So, at a depth of installation of the base up to 40 m (figure 2), the installation of self-propelled semi-immersed modules 5 on the base plate 3 is carried out directly.

At a depth of installation of the base in the range from 40 to 100 m (Fig. 3), each support of the base 6 is made of separate, rigidly interconnected unified sections 11, which are additionally connected with cemented piles 4 by tension elements 12, tension devices 13 of the latter are installed on a horizontal platform 5.

At depths of installation of the base over 100 m (Fig. 4), the base 7 is performed with at least one intermediate pontoon device 14. The number of unified intermediate pontoon devices and the distance between them (Fig. 5) are determined by calculation based on the corresponding installation depth .

When installing the offshore platform in the iceberg passage zones (Fig. 6), the base 7 is made with retractable supporting elements 15, which are rigidly connected to the intermediate deck 16, and on the latter a semi-submerged module 5 with technological equipment 6 is located.

The arrangement of an offshore field is implemented as follows.

A method of equipping an offshore field with unified technical means is being implemented, in which a central 1 and peripheral 2 offshore platforms are constructed (Fig. 1), each platform is made with a base plate 3, which is rigidly connected to hard ground with cemented piles 4, and a semi-submerged module is mounted on the base plate 3 5 with technological equipment 6 directly or through the base 7 with a buried upper deck 8, offshore platforms are connected by pipelines 9 to each other and to the onshore compressor station 10.

Semi-submerged modules 5 with technological equipment 6 are interchangeable specialized and self-propelled, for example in the form of a catamaran, the change of specialized semi-submerged modules 5 is carried out in accordance with the technological process, and the base 7 is made with supports from unified sections 11, rigidly interconnected.

At the same time, semi-submerged modules 5 with technological equipment 6 are implemented as a drilling module, a production module - production and control, a module from a compressor or pump station and a major overhaul module.

Moreover, at installation depths of the offshore platform from 40 to 100 m (Fig. 3), each support of the base 7 is made of separate, rigidly interconnected unified sections 11, which are additionally connected to the cemented piles 4 by tension elements 12, and the corresponding tension devices 13 of the latter are installed on the upper deck 8.

In addition, at installation depths of the offshore platform of up to 40 m (FIG. 2), direct installation of self-propelled semi-submerged modules 5 is carried out on the base plate 3.

At installation depths of the offshore platform over 100 m, the base 7 is made with at least one intermediate pontoon device 14 (FIG. 4), the number of unified intermediate pontoon devices (FIG. 5) and the distance between them are determined by calculation based on the corresponding depth their installation.

When installing the offshore platform in areas where icebergs are possible (Fig. 6), the upper deck 8 is equipped with retractable bearings 15 with corresponding drives, which are rigidly connected to the intermediate deck 16, and the removable self-propelled semi-immersed technological module 5 is installed on the last one.

In any of the listed options for the implementation of offshore platforms, under extreme conditions, a semi-submerged module is assigned to a safe place or to a coastal base.

The proposed method is universal, since it takes into account any climatic conditions:

- non-freezing seas - hurricanes, seismic, and, as a result, tsunamis - the removal of a semi-submerged technological module when making a reliable forecast;

- freezing seas - the diversion of the technological semi-submerged module in adverse ice conditions, in the presence of icebergs.

In addition, the use of semi-submersible specialized technological modules, which are located on the upper deck only for the period of the corresponding type of work and which are unified modules, increases their economic efficiency both in manufacturing and in operation.

At the same time, the presence of unified technological modules, unified sections of base supports, unified intermediate pontoon devices opens the way to the effective use of the method in industrial production.

Literature

1. RF patent No. 2198261, 06/28/2001.

2. RF patent No. 2238365, July 25, 2003.

3. Patent No. 2296836, 10/12/2005 - prototype.

Notation list

1. Central platform.

2. The peripheral platform.

3. Base plate.

4. Cemented piles.

5. Semi-submerged module.

6. Technological equipment.

7. The basis.

8. The upper deck.

9. Pipelines.

10. Compressor (pumping) station.

11. Unified support sections.

12. Tension elements.

13. Tensioning devices.

14. Intermediate pontoons.

15. Retractable support elements.

16. Intermediate deck.

Claims (4)

1. A method for equipping an offshore field with unified technical means, in which a central and peripheral offshore platform is built, each platform is made with a base plate, which is rigidly connected to hard ground with cemented piles, a semi-submerged module is installed directly or through the base with a buried upper deck with technological equipment, offshore platforms are connected by pipelines to each other and to the coastal compressor station, characterized in that the base is made with supports from unified sections, rigidly interconnected, and each semi-submerged module with technological equipment is removable and self-propelled in the form of a catamaran, on which either drilling, production, or compressor, or pumping equipment or equipment for overhaul, moreover, the change of semi-submerged modules is carried out in accordance with the technological process - drilling, operation, main nt. 2. The method according to claim 1, characterized in that at the installation depths of the offshore platform from 40 to 100 m, each base support is made of separate, rigidly interconnected sections that are additionally connected to the cemented piles by tension elements, and the corresponding tension devices of the latter set on the upper platform. 3. The method according to claim 2, characterized in that at the depths of installation of the offshore platform over 100 m, the base is made with at least one intermediate pontoon device, the number of unified intermediate pontoon devices and the distance between them are determined by calculation, based on appropriate depth of their installation. 4. The method according to claim 2, or 3, characterized in that the upper deck of the base is equipped with extendable supports with corresponding drives, which are rigidly connected to the intermediate deck, a semi-immersed module is installed on the latter.

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