Injection-production integrated compact wellhead platform

Abstract

The utility model discloses an injection-production integrated compact wellhead platform, which belongs to the technical field of offshore oil engineering and comprises an upper module, an injection-production integrated system is arranged in the upper module so that oil gas can be exploited and injected and pressurized on the same platform, and a lower deck, a middle deck and an upper deck are arranged in the upper module. And the upper module is divided into three layers so as to provide an arrangement space for the injection-production integrated system. Through injection and production integrated compact arrangement, under the condition that the area of the platform is the same as that of an existing offshore four-leg wellhead platform, the oil and gas production and treatment functions are achieved, the natural gas pressurization and reinjection functions are also achieved, the engineering cost is greatly reduced, and efficient and rapid development of a gas field is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of offshore oil engineering, and in particular relates to a compact injection-production integrated wellhead platform. Background Art

[0002] Existing offshore platform gas field development projects, especially those that require gas injection development, usually have dedicated gas production wellhead platforms and dedicated gas injection and boosting platforms, and sometimes also have a central processing platform. There are two solutions. One is that the natural gas produced by the wellhead platform is dehydrated and then transported to the gas injection and boosting platform through a submarine pipeline or a pipeline on a trestle between two platforms. After being pressurized by a compressor on the gas injection and boosting platform, it is returned to the wellhead platform through a submarine pipeline or a pipeline on the trestle and injected back into the reservoir formation. Another solution is that the logistics of several wellhead platforms are transported to a central processing platform through submarine pipelines for processing. The treated natural gas is then transported to the compressor on the gas injection and boosting platform through submarine pipelines for pressurization and then injected back into the reservoir formation of the wellhead platform through pipelines. Such a solution requires more platforms, especially the construction of an additional boosting gas injection platform. The gas reinjection pipeline is very long, the project investment is large, and the economic benefits are poor.

[0003] Therefore, it is urgent to design a compact wellhead platform that integrates injection and production to solve the problem that the above-mentioned gas injection development projects require a special gas injection boosting platform. Utility Model Content

[0004] In order to solve the technical problem mentioned in the background technology that a gas injection development project needs to be specially equipped with a gas injection and boosting platform, a compact wellhead platform integrating injection and production is provided to solve the above problem.

[0005] To achieve the above purpose, the specific technical solution of a compact wellhead platform integrating injection and production of the utility model is as follows:

[0006] A compact wellhead platform integrating injection and production comprises an upper block, wherein an injection and production system is arranged in the upper block, so that oil and gas can be produced, processed and injected and pressurized on the same platform; a lower deck, a middle deck and an upper deck are arranged in the upper block, so that the upper block is divided into three layers, so as to provide space for arranging the injection and production system.

[0007] Furthermore, the integrated injection-production system includes a wellhead area, which sequentially passes through the lower deck, the middle deck and the upper deck to connect the integrated injection-production system with the reservoir formation.

[0008] Furthermore, an oil tree is provided in the wellhead area for the injection-production integrated system to extract oil and gas. The oil tree is connected to a production manifold area for transporting and metering the collected oil and gas. The production manifold area is connected to a heating area for heating the collected oil and gas. The heating area is connected to an oil and gas processing area for gas-liquid separation of the oil and gas. The oil and gas processing area is respectively connected to an injection compressor and an external transmission pipeline. The injection compressor is connected to the oil reservoir formation so that the injection-production integrated system can inject gas to pressurize the oil reservoir formation.

[0009] Furthermore, the height of the gas injection compressor is higher than the height of the Christmas tree.

[0010] Furthermore, the Christmas tree is located in the wellhead area of ​​the middle deck, the gas injection compressor is located on the upper deck, the gas injection compressor is arranged close to the wellhead area of ​​the upper deck, and a cooling treatment area is connected to the gas injection compressor to cool the gas input into the gas injection compressor.

[0011] Furthermore, a soundproof wall is provided on the upper deck, and the soundproof wall is located at the head of the gas injection compressor.

[0012] Furthermore, the production manifold area and the heating area are both located on the lower deck, and one side of the heating area is connected to an open and close drainage system to discharge waste generated during the collection and processing process.

[0013] Furthermore, a seawater and fire fighting system is provided on the lower deck to utilize the seawater.

[0014] Furthermore, a fireproof and explosion-proof wall is provided on the middle deck to separate the middle deck into a dangerous area and a non-dangerous area. The oil and gas processing area and the wellhead area of ​​the middle deck are both located in the dangerous area, and the oil and gas processing area is arranged close to the wellhead area of ​​the middle deck.

[0015] Furthermore, diesel fire pumps connected to seawater and firefighting systems are provided in non-hazardous areas to ensure emergency response in hazardous areas.

[0016] The compact wellhead platform for injection and production integrated with the present invention has the following advantages: through the compact arrangement of injection and production integrated with the present invention, with the same area as the previous offshore four-legged wellhead platform, it can have both the function of oil and gas extraction and processing and the function of natural gas pressurization and reinjection, which greatly reduces the engineering cost and realizes the efficient and rapid development of gas fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the upper deck structure layout of the utility model;

[0018] Figure 2 This is a schematic diagram of the middle deck structure layout of the utility model;

[0019] Figure 3This is a schematic diagram of the lower deck structure layout of the utility model;

[0020] Explanation of the markings in the figure: 1. Upper deck; 2. Middle deck; 3. Lower deck; 4. Wellhead area; 5. Production manifold area; 6. Heating area; 7. Oil and gas processing area; 801. First air injection compressor; 802. Second air injection compressor; 9. Cooling treatment area; 10. Open and close exhaust system; 11. Seawater and fire fighting system; 12. Diesel fire fighting pump; 13. First workshop; 14. Helicopter deck; 15. Tower crane; 16. Second workshop; 17. Air compressor instrument air system. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0023] Please refer to the attached Figure 1 To Attachment Figure 3 The utility model is described as a compact wellhead platform integrating injection and production.

[0024] The existing offshore four-legged wellhead platforms generally only have the functions of oil and gas extraction or oil and gas extraction and processing. On this basis, a four-legged gas injection and boosting platform must be built to place the gas injection compressor to boost the natural gas transported from the gas production platform and then transport it back to the gas injection well formation of the gas production platform.

[0025] Therefore, the utility model provides a compact wellhead platform integrating injection and production, such as Figures 1 to 3 As shown, it includes an upper module, in which an injection-production integrated system is arranged, so that oil and gas can be produced, processed and injected and pressurized on the same platform. A lower deck 3, a middle deck 2 and an upper deck 1 are arranged in the upper module, so as to divide the upper module into three layers, so as to provide a layout space for the injection-production integrated system. A four-legged conductor frame is connected to the bottom of the upper module to support the upper module on the sea surface, forming a small offshore four-legged wellhead platform.

[0026] The injection-production integrated system comprises a wellhead area 4, which sequentially penetrates the lower deck 3, the middle deck 2 and the upper deck 1, so as to connect the injection-production integrated system with the reservoir formation.

[0027] A Christmas tree is provided in the wellhead area 4 for the injection-production integrated system to produce oil and gas. The Christmas tree is connected to a production manifold area 5 for transporting and metering the collected oil and gas. The production manifold area 5 is connected to a heating area 6 for heating the collected oil and gas. The heating area 6 is connected to an oil and gas processing area 7 for gas-liquid separation of the oil and gas. The oil and gas processing area 7 is respectively connected to an injection compressor and an external transmission pipeline. The injection compressor is connected to the oil reservoir formation so that the injection-production integrated system can inject gas and pressurize the oil reservoir formation.

[0028] As a preferred example, Figure 1 As shown, two gas injection compressors are provided, and the first gas injection compressor 801 and the second gas injection compressor 802 are respectively located on both sides of the wellhead area 4 of the upper deck 1, so as to make the platform structure compact and reduce the layout of pipelines.

[0029] Optionally, the production manifold area 5 includes interconnected production manifolds and metering manifolds, the heating area 6 includes an electric heater skid, the oil and gas processing area 7 includes interconnected TEG regeneration systems, production separators, multiphase flow meters, chemical injection skids, TEG dehydration towers, coolers, methanol injection system equipment, etc., and the gas separated in the oil and gas processing area 7 is connected to the gas injection compressor through the TEG dehydration tower.

[0030] The height of the gas injection compressor is higher than the height of the Christmas tree, so as to reduce the pressure required by the gas injection compressor when injecting gas into the reservoir formation, making it easier for the gas injection compressor to inject gas into the reservoir formation.

[0031] Preferably, the Christmas tree is located in the wellhead area 4 of the middle deck 2, the gas injection compressor is located on the upper deck 1, and the gas injection compressor is arranged close to the wellhead area 4 of the upper deck 1. The gas injection compressor is connected to a cooling treatment area 9 to cool the gas input into the gas injection compressor. Optionally, the cooling treatment area 9 includes a heat exchanger, a nitrogen bottle skid, and a cooling water expansion tank, etc., which are interconnected.

[0032] A soundproof wall is provided on the upper deck 1, and is located at the head of the gas injection compressor to reduce noise in other areas.

[0033] Preferably, a tower crane 15 is provided on the upper deck 1 to lift the workers from the ship to the platform, and a reserved operation area is also provided within the lifting range of the tower crane 15 to facilitate drilling operations and the transportation of temporary equipment.

[0034] The production manifold area 5 and the heating area 6 are both located on the lower deck 3. One side of the heating area 6 is connected to an open and close drainage system 10 to discharge wastes in the collection and processing process. The open and close drainage system 10 is located on the lower deck 3, which is convenient for waste water, oil and other wastes to be collected from the upper deck 1 and the middle deck 2 at the open and close drainage system 10 under the action of gravity, so as to facilitate maintenance by staff.

[0035] The lower deck 3 is provided with a seawater and fire fighting system 11 to utilize seawater and reduce the laying of pipelines, thus saving costs.

[0036] A fireproof and explosion-proof wall is provided on the middle deck 2 to separate the middle deck 2 into a dangerous area and a non-dangerous area. The oil and gas processing area 7 and the wellhead area 4 of the middle deck 2 are both located in the dangerous area. The oil and gas processing area 7 is arranged close to the wellhead area 4 of the middle deck 2 to facilitate zoning by the fireproof and explosion-proof wall.

[0037] The non-hazardous area is provided with a diesel fire pump 12 connected to the seawater and the fire fighting system 11 to ensure emergency handling in the hazardous area.

[0038] Preferably, a helicopter deck 14 for helicopters to dock is provided on the upper deck 1, and a first workshop 13 for placing a main transformer is provided next to the tower crane 15.

[0039] Preferably, a second workshop 16 located in a non-hazardous area is provided on the middle deck 2 to facilitate emergency operation and control of the system by staff. The second workshop 16 can be provided with two floors to facilitate the layout of equipment. An air compressor instrument air system 17 located in a non-hazardous area is provided next to the second workshop 16 to control the opening and closing of the valves of the injection-production integrated system.

[0040] In a specific embodiment, the upper module is a four-leg module with an axial spacing of 18 meters * 20 meters. A four-leg jacket is connected to the lower part of the upper module. The height between the middle deck 2 and the upper deck 1 is 8 meters, and the height between the lower deck 3 and the middle deck 2 is 5.5 meters. The upper deck 1 is about 48 meters long and 30 meters wide. A wellhead area 4 is arranged in the middle of the axis; the middle deck 2 is about 47 meters long and 30 meters wide; the lower deck 3 is about 33 meters long and 30 meters wide. Facilities and equipment are arranged and connected on the above-mentioned lower deck 3, middle deck 2 and upper deck 1. The compact wellhead platform with integrated injection and production can achieve a gas production processing capacity of 1.46 million cubic meters / day, a liquid production processing capacity of 1.1 thousand cubic meters / day, a gas injection volume of 960,000 cubic meters / day, and a gas injection pressure of 50MPaG.

[0041] The utility model realizes both oil and gas extraction and processing functions and natural gas pressurized reinjection function with the same area as the previous offshore four-legged wellhead platform through a compact injection-production integrated layout, which greatly reduces the engineering cost and realizes efficient and rapid development of gas fields.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A compact wellhead platform integrating injection and production, characterized in that: It includes an upper block, in which an injection-production integrated system is provided, so that oil and gas can be produced and processed and injected and pressurized on the same platform, and a lower deck, a middle deck and an upper deck are provided in the upper block, so that the upper block is divided into three layers, so as to provide space for arranging the injection-production integrated system; The integrated injection and production system includes the wellhead area; The wellhead area is equipped with a Christmas tree for the injection-production integrated system to produce oil and gas. The Christmas tree is connected to a production manifold area for transporting and measuring the collected oil and gas. The production manifold area is connected to a heating area for heating the collected oil and gas. The heating area is connected to an oil and gas processing area for gas-liquid separation of the oil and gas. The oil and gas processing area is respectively connected to a gas injection compressor and an external transmission pipeline; The height of the gas injection compressor is higher than the height of the Christmas tree; The production manifold area and heating area are both located on the lower deck to separate the middle deck into dangerous areas and non-dangerous areas; There are fire and explosion-proof walls on the middle deck; Diesel fire pumps connected to seawater and firefighting systems are installed in non-hazardous areas to ensure emergency response in hazardous areas.

2. The compact wellhead platform for injection and production according to claim 1, characterized in that: The wellhead area sequentially passes through the lower deck, the middle deck and the upper deck to connect the injection-production integrated system with the reservoir formation.

3. The compact wellhead platform for injection and production according to claim 2, characterized in that: The gas injection compressor is connected to the oil reservoir formation so that the injection-production integrated system can inject gas to pressurize the oil reservoir formation.

4. The compact wellhead platform for injection and production according to claim 1, characterized in that: The Christmas tree is located in the wellhead area of ​​the middle deck, and the gas injection compressor is located on the upper deck. The gas injection compressor is arranged close to the wellhead area of ​​the upper deck, and a cooling treatment area is connected to the gas injection compressor to cool the gas input into the gas injection compressor.

5. The compact wellhead platform for injection and production according to claim 4, characterized in that: There is a soundproof wall on the upper deck, which is located at the nose of the gas injection compressor.

6. The compact wellhead platform for injection and production according to claim 4, characterized in that: One side of the heating zone is connected to an open and close discharge system to discharge waste during the collection and treatment process.

7. The compact wellhead platform for injection and production according to claim 6, characterized in that: The lower deck is equipped with seawater and fire-fighting systems to utilize seawater.

8. The compact wellhead platform for injection and production according to claim 7, characterized in that: The oil and gas processing area and the wellhead area of ​​the middle deck are both located in the danger zone, and the oil and gas processing area is set close to the wellhead area of ​​the middle deck.

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