Submerged oil and gas production platform

FIELD: oil and gas industry.

SUBSTANCE: platform contains supporting base of submerged type. Note that platform power unit-module is made in the form of automated nuclear electric station designed for power supply, and unit-modules are made with compressor and pump equipment, with automated control system, with diving and submerged-technical equipment that serve for primary preparation of well product for transportation to the main process platform and/or to offshore off-loading terminal for well product storage. Note that the whole platform assy is made in the form of circle and/or polygon, in the centre of which there is a wellhead module with wellheads equally spaced between themselves.

EFFECT: increase of reliability of submerged production platforms construction and operation with simultaneous provision of wells location inside the object.

8 cl, 3 dwg

 

The invention relates to the development of underwater mineral deposits, mostly liquid and gaseous, namely, for construction of technological systems designed for offshore deepwater oil and gas fields and working in extreme conditions and can be used in deep water, on which the possible arrival of icebergs and floating ice fields or freezing for a long time, and where there are recoverable reserves of hydrocarbons, development of which currently can be done (for example, at the Shtokman gas-condensate field), mainly by creating a very expensive cost and complexity of their creation and operation of subsea production units (hereinafter MPC).

Known Maritime technological complex for development of deepwater oil and gas fields, including a number of fixed offshore platforms, subsea bottom complexes, underwater infield and pipelines, tanks for storage of production wells and shipping installation, and at least one of the platforms made in the underwater performance and secured to the bottom of the support block, the upper envelope of which is located below the water level to the size of the largest dimension of the underwater passage is Asti iceberg (RF patent 2238365, in class. IV 17/00 from 25.07.2003,).

The disadvantage of this Maritime technological complex is the need to produce complex and expensive separation and removal in a safe and protected from ice and icebergs area of the upper movable module with temporary stop operation of the offshore platform with the corresponding economic losses.

The closest to the technical essence and the achieved result is an offshore processing facility, including underwater infield and pipelines, tanks for storage of production wells and shipping installation, however, some platforms are made in the underwater and lacosamide performed with fixation to the bottom, for example, the control unit, the upper envelope of which is located below the water level to the size of the largest dimension of the passage of the underwater part of the iceberg, and thrust blocks platforms in the underwater performance to perform block-modules serving to accommodate personnel in underwater air chambers designed to implement the periodic maintenance, repair and inspection structures and technological equipment, automated control systems and control, and the unit energy platform is designed with an automated nuclear power plant is designed for energy supply technology of underwater platforms, and the block-modules technology platforms made with separation plants, compressor and pumping equipment, with an automated control system and with diving and underwater engineering equipment designed for primary treatment of production wells for transportation to a Central processing platform and/or to an offshore loading berth with storage capacity of production wells (RF patent 2383683, CL EV 17/00 from 30.09.2008 year).

A disadvantage of such systems is the need to protect them from ice impacts, and does not exclude the probability of their collision with icebergs, which leads to a substantial increase in metal consumption and material consumption, and with increasing depths of these oil and gas fields are unlikely to be developed in a traditional way, especially when besides increasing distance from shore.

Also the disadvantage of this complex is hard its fixation on pre-calculated in accordance with the statistical data depth from the calm surface of the sea, (the reliability of which, by their nature, may not be completely accurate).

In addition, upon completion of the field development disposal of fixed platform (especially in the underwater version) represents certain difficulties and costs on the installation and can be very high (and as you know the costs of disposal of major fixed offshore facilities of the oil and gas sector in the Gulf of Mexico and the North sea only 2-5 times lower than the costs incurred in their time for their creation).

The aim of the present invention is to provide an underwater craft, allowing for a meeting with the underwater part of the iceberg smoothly and gently to bend and return to its original position after its passage while ensuring the location of wells within the facility and to improve the reliability of construction and operation of the PEP.

This objective is achieved in that in the underwater operational platform (hereinafter PET) for offshore oil and gas production, including support Foundation submersible type (deck deck type, which are installed ballast tanks designed to dive to a given depth, and also to hold the entire complex in a horizontal position)at which the sector (to be more compact and make the ovality of the entire configuration of the probes) install using the fixing functional compounds isolated (sealed) block-modules that are essential for the deployment of staff and for the implementation of periodic maintenance, repair and inspection of structures and process equipment the project, automated systems of management and control, with power unit platform is designed in the form of an automated nuclear power plant, designed for energy security, and blocks modules made with a compressor and pumping equipment, with an automated control system, with diving and underwater engineering equipment, which are designed for primary treatment of production wells for transportation to a Central processing platform and/or to an offshore loading berth with storage capacity of production wells, and the entire platform Assembly is made close to the shape of a circle/polygon in the center of which is located estuarine module with wells installed evenly between the wellheads.

In addition, this goal is achieved by the fact that the platform is made of a closed (preferably oval) shape and consists of several block modules, interconnected and with two circular corridors (internal and external), intended for communication between the unit modules, and also for lifting/lowering personnel using, for example, mobile sealed capsules.

In addition, this goal is achieved also by the fact that all block-modules are sealed (with an Autonomous system of dive - order bol is e free movement in the vertical directions) and isolated from each other (but communicating with both circular corridors: internal and external) and installed with the possibility, if necessary, retrieve on the surface for repair or replacement.

In addition, this goal is achieved also by the fact that all modules are made with their own ballast system designed for diving and surfacing.

In addition, this goal is achieved by the fact that the platform is equipped with a vertical retractable pipe for supply/exhaust air ambient air and is equipped in its upper part module buoyancy, made for example in the form of a hollow torus surrounding the sliding pipe.

In addition, this goal is achieved by the fact that the vertical retractable pipe is provided with a longitudinal partition wall to provide ventilation (this pipe is also possible the installation of an Elevator to move personnel).

In addition, the objective is also achieved by the fact that the platform is equipped with a lifting mechanism designed for lowering and lifting at a safe depth.

In addition, this goal is achieved by the fact that all wells protected individual riser columns, the ends of which are mounted the hinge device tube type, designed to ensure the rejection of all wellheads and return to its original position after passage of the iceberg.

The proposed solution is illustrated by drawings, where:

1 shows a General view of p is vodnoy operational platform;

figure 2 is a top view of figure 1;

figure 3 - the process of drilling wells with the location of the mouths directly in a submerged object.

1 - underwater operational platform (PEP);

2 - supporting basis;

3 - the ground;

4 - tension connection (supports);

5 - seabed;

6 - estuarine module;

7 - the wellhead;

8 - unit-module;

9 - circular inner hallway;

10 - circular exterior corridor;

11 - output airlock;

12 - cell sealed capsule;

13 - underwater support structure;

14 - module buoyancy underwater support structure;

15 - individual riser column;

16 - hinge device;

17 is a vertical extension pipe;

18 - module buoyancy vertical sliding tube.

Submarine operational platform (PEP) 1 (see Figure 1) for offshore oil and gas consists of a base 2 submersible type, placed on the frame 3 and the tension of "ties" (supports) 4. Support 4 is realized by mounting the support base 2 and a platform 3 to the seabed 5 by any known method (for example, by a system of anchors that are installed on the bottom in advance). The support base 2 (see Figure 2) is a circle and/or polygon in the center of which is located estuarine module 6 wellheads 7. Wellheads 7 rasstavleniya equal distances. Around the wellhead module 6 on the perimeter of the sector are block-8 modules, interconnected for message two circular corridors (internal and external) 9 and 10. Circular inner hallway 9 adjoins osteoma module 6. Circular exterior corridor 10 passes through a large radius from the center of the wellhead module all around the block units 8. In both corridors 9, 10 are placed on the sides weekends lock chamber 11, equipped with a mobile sealed capsules 12 to move personnel and equipment from the probe. Both circular corridors 9, 10 laid all the necessary technological pipelines, communication lines, control, etc. the Number of block modules 8 on probe 1 is determined from the conditions for placing the energy, technology, modules, module, air-conditioning systems and air purification, pumps, compressors, auxiliary, accommodation modules and others. Block-modules 8 are sealed and isolated from each other, and serve to accommodate personnel and equipment. Each module 8 has a certain autonomy of management and has its own ballast system designed for vertical movement until the ascent to the surface. Support platform 3 includes an underwater support structure 13, with its own redundant module is buoyancy 14 is in the form of a torus, partitioned tanks to retain the entire complex in a horizontal position, since all the unit modules may differ significantly due to their weight. Tension links (support) 4 can be made vertical and/or inclined in the form of multi-tiered chains and/or cables and/or telescopic elements, such as tubular. All wells 7 protected individual riser columns 15, the ends of which are mounted the hinge device type tube 16. Submarine operational platform (PEP) can be optionally equipped with a vertical sliding tube 17, is provided in the upper part of the buoyancy module 18. The buoyancy module 18 is made in the form, for example, a hollow torus surrounding the sliding pipe.

The probe first tow of the supporting platform 3. Thanks to their own excess buoyancy module 14 this platform 3 mounted on the estimated depth and fixed idler bearings 4 on the seabed 5. Then depending on conditions using a crane vessel or offline lowered and set at the reference area 3 reference base 2. Slice module buoyancy underwater support structure 14 contributes to balance (ballasting) in the process of replacing and/or absence of one or more block modules 8.

Drilling produces:

through presents (declared) in this application, the probe 1 by using, for example, semi-submersible drilling rig/or (when mastered the technology of underwater drilling) through one or more block modules 8, which will be equipped with all necessary drilling equipment.

Thus oceniania (wellhead equipment, seal the mouth of the wells and the like) is located in wellhead module 6.

After drilling all wells:

- semi-submersible drilling rig is detached from the probe, leaving the appointment of the next field/one/several block modules 8, which(mi) was equipped with the necessary drilling equipment, disconnect, and leads to the dock, but instead comes another unit with the necessary operational equipment or balanced by the module buoyancy underwater support structure 14. After that, the stated object, the probe begins to function independently. With the passage of the iceberg hinge device 16 installed on individual riser columns 15, provide the deviation of all wellheads and return to its original position. Vertical sliding tube 17 is designed to supply and/or exhaust atmospheric air, as well as lift for the movement of personnel. It is assumed that the probe will contain all systems: air conditioning and air cleaning, lighting, heating, sanitary whom the devices are similar to the corresponding systems nuclear submarine (ALL), for example, the project 941 ("Shark").

So, after drilling (figure 3) all wells semi-submersible drilling rig detached from an underwater platform, goes on assignment for the next field, and our object (AEDs) begins to function independently (figure 1), i.e., comes the long period of operation (i.e. field development). Again, it must be noted that all block-modules will join the circular compartment who, with the help of which will be provided the ability to move personnel in the required spaces.

The main purpose of the claimed technical solution is to create a underwater craft, which would be placed well inside the object, unlike traditional at great depths to install wells on the seabed, which are practically inaccessible to divers, resulting in subsea wellheads expensive equip-controlled equipment, not always distinguished by reliability and maintainability (especially in underwater conditions). In the proposed object wellhead equipment of all wellheads, as well as any equipment installed in the unit modules, at any time available for preventive maintenance and repairs.

Implementation of the proposed technical solution will allow to increase reliability is stroitelstva and operation of subsea production platforms while ensuring the location of wells within the facility and to ensure the meeting with the underwater part of the iceberg smoothly and gently to bend and return to its original position after its passage.

1. Submarine operational platform for offshore oil and gas, consisting of a substructure submersible type, placed on the frame, and a tension support; the support base is a circle and/or polygon in the center of which is located estuarine module with wellheads; around the wellhead module on the perimeter of the sector are block-modules, interconnected to two messages, internal and external, circular corridors; the corridors are fitted on the sides of a weekend gateway camera equipped mobile sealed capsules for the movement of personnel and equipment; block-modules are sealed and isolated from each other and serve to accommodate personnel and for the periodic maintenance, repair and inspection of structures and technological equipment, automated control systems and control, while the power unit platform is designed in the form of an automated nuclear power plant, designed for energy security, and blocks modules made with compression and pumping equipment, with an automated control system, with diving and underwater engineering equipment, which designation is s for pre-production wells for transportation to a Central processing platform and/or to an offshore loading dock with capacity to store products wells; each unit has self control and is equipped with its own ballast system designed for vertical movement until the ascent to the surface; the support platform includes an underwater support structure, with its own excess buoyancy module, made in the form of a torus.

2. Underwater maintenance platform according to claim 1, characterized in that the mouth of wells spaced at equal distances, with all wells protected individual riser columns, the ends of which are mounted swivel tubular device type.

3. Underwater maintenance platform according to claim 1, characterized in that the circular inner hallway adjacent to osteoma module, and a circular exterior corridor passes through a large radius from the center of the wellhead module all around the block modules.

4. Underwater maintenance platform according to claim 1, characterized in that both the circular corridors laid all the necessary technological pipelines, communication lines, control.

5. Underwater maintenance platform according to claim 1, characterized in that the tension bearing can be made vertical and/or inclined in the form of a multi-link chains and/or cables and/or telescopic elements.

6. Underwater maintenance platform according to claim 1, characterized in that h is additionally can be equipped with vertical sliding tube, provided in the upper part of the module buoyancy, the buoyancy module is executed in the form of a hollow torus surrounding the sliding pipe.

7. Underwater maintenance platform according to claim 1, characterized in that it is equipped with a lifting mechanism designed if necessary for lowering and lifting at a safe depth.

8. Underwater maintenance platform according to claim 1, characterized in that all wells protected individual riser columns, the ends of which are mounted the hinge device tube type, designed to ensure the rejection of all wellheads and return to its original position after passage of the iceberg.



 

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