Temporary fixing device for oil pipeline on offshore oil production platform

Abstract

The present invention discloses a temporary fixing device for oil pipes of an offshore oil production platform, comprising a lower fixing plate, wherein the lower fixing plate comprises at least two lower splicing card plates, and through holes are arranged between adjacent lower splicing card plates, and the aperture of the through holes matches the diameter of the oil pipe; buoyancy boxes are arranged at both ends of the lower fixing plate, and a drainage port is arranged at the bottom or lower part of the buoyancy box, and an air injection pipe is arranged at the upper part or top part of the buoyancy box. The device fixes the top section of the oil production pipe and the oil delivery pipe through the upper fixing plate with a matching flange, fixes the surface section of the oil production pipe and the oil delivery pipe through the lower fixing plate with a matching flange, uses the buoyancy box to provide buoyancy support for the oil pipe, and adjusts the inclination of the oil pipe through the air injection pipe and the drainage port of the front cabin and the rear cabin to ensure that the oil pipe always maintains a vertical state with the seabed. Compared with the existing method, it has the advantages of simple structure, convenient operation and low cost.

Description

Technical Field

[0001] The invention relates to an oil pipe fixing device, in particular to an oil pipe temporary fixing device for an offshore oil production platform, and belongs to the technical field of marine engineering. Background Art

[0002] When the buoyancy tower platform is performing a mirror-image replacement operation, it is necessary to simultaneously detach the platform and the oil pipe, then perform a mirror-image replacement, and then reinstall. The reinstallation includes re-fixing the platform together with the external oil pipe and the production pipe. However, during the period between detachment and re-fixation, the production pipe and the external oil pipe are unsupported. The external oil pipe is not inserted into the seabed, and its weight will collapse due to a complete lack of support. The production pipe is inserted into the seabed, and the weight of the production pipe in the water can be transferred to the production pipe under the seabed, but the production pipe without upward tension will fall to the ground and break under the action of waves, so a device is needed to temporarily fix the production pipe and the external oil pipe.

[0003] In addition, due to other reasons, the external oil pipeline and the oil production pipeline also need to be separated from the platform and temporarily fixed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to achieve temporary fixation of an oil pipeline of an offshore oil production platform after the oil pipeline is separated from the platform.

[0005] In order to solve the above technical problems, the temporary fixing device of the oil pipeline of the offshore oil production platform of the present invention includes a lower fixing plate, which includes at least two lower splicing card plates, and through holes are arranged between adjacent lower splicing card plates, and the aperture of the through holes matches the diameter of the oil pipeline; buoyancy boxes are arranged at both ends of the lower fixing plate, and a drainage port is arranged at the bottom or lower part of the buoyancy box, and an air injection pipe is arranged at the upper part or top of the buoyancy box.

[0006] A further improvement of the above technical solution, wherein the buoyancy tank comprises a front cabin and a rear cabin, wherein the front cabin and the rear cabin are not connected to each other, a drain outlet is provided at the bottom or lower portion of the front cabin, and an air injection pipe is provided at the upper portion or top portion of the front cabin; a drain outlet is provided at the bottom or lower portion of the rear cabin, and an air injection pipe is provided at the upper portion or top portion of the rear cabin.

[0007] A further improvement of the above technical solution is that a connection auxiliary plate is provided between the lower splicing card plates.

[0008] A further improvement of the above technical solution is that an upper fixing plate is further arranged above the lower fixing plate, the upper fixing plate comprises at least two upper splicing card plates, through holes are arranged between adjacent upper splicing card plates, and the diameter of the through holes matches the diameter of the oil pipe. A connection auxiliary plate is arranged between the upper splicing card plates.

[0009] A further improvement of the above technical solution is that the lower fixed plate is connected to the fixed piles through mooring cables. The fixed piles are suction piles or small tugboats, and at least three fixed piles are provided.

[0010] The temporary fixing device for oil pipelines of offshore oil production platforms of the present invention fixes the top sections of oil production pipelines and oil delivery pipelines through the upper fixing plate and the matching flange, fixes the surface sections of oil production pipelines and oil delivery pipelines through the lower fixing plate and the matching flange, uses the buoyancy tank to provide buoyancy support for the oil pipelines, and adjusts the inclination of the oil pipelines through the gas injection pipes and the drainage ports of the front and rear cabins to ensure that the oil pipelines always remain vertical to the seabed. Compared with the existing methods, it has the advantages of simple structure, convenient operation and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the main structural diagram of the temporary fixing device for oil pipes on an offshore oil production platform when it is in use.

[0012] Figure 2 This is a side view of the structure of the temporary fixing device for oil pipes on an offshore oil production platform when in use.

[0013] Figure 3 This is a top view of the structure of the upper fixing plate in the temporary fixing device for the oil pipeline on the offshore oil platform.

[0014] Figure 4 This is a top view of the lower fixing plate in the temporary fixing device for the oil pipeline on the offshore oil platform. DETAILED DESCRIPTION

[0015] See also Figures 1 to 4 The oil pipeline of the offshore oil production platform generally includes multiple oil production pipes 71 and one or more external oil delivery pipes 72. The lower end of the oil production pipe 71 is inserted into the seabed 9, and the lower end of the external oil delivery pipe 72 is above the seabed 9. In order to facilitate the subsequent temporary fixation of the oil pipeline, the oil production pipe 71 can be arranged in a single layer or multiple layers, and the axis of each layer of the oil production pipe 71 is on the same plane, and the axis of the external oil delivery pipe 72 is on the same plane as the axis of one layer of the production pipe 71.

[0016] The temporary fixing device of the oil pipeline of the offshore oil production platform includes a lower fixing plate 1, which is arranged above the water surface 8 of the oil pipeline through a flange 6. The lower fixing plate 1 includes a plurality of lower splicing card plates 11, and through holes and lower connection auxiliary plates 12 are arranged between adjacent lower splicing card plates 11, and the lower connection auxiliary plates 12 are arranged between the through holes. The aperture of the through hole matches the diameter of the oil pipeline. Both ends of the lower side of the lower fixing plate 1 are provided with buoyancy boxes 3, and the buoyancy boxes 3 float on the water surface 8. The buoyancy box 3 includes a front cabin 31 and a rear cabin 32, and the front cabin 31 and the rear cabin 32 are separated by a partition to ensure that there is no conduction between the two. The bottoms of the front cabin 31 and the rear cabin 32 are provided with drain ports, and the drain ports are connected to drain pipes 5. The upper sides of the front cabin 31 and the rear cabin 32 are provided with gas injection pipes 4.

[0017] An upper fixing plate 2 is also arranged above the lower fixing plate 1. The structure of the upper fixing plate 2 is similar to that of the lower fixing plate 1, but the upper fixing plate 2 is smaller than the lower fixing plate 1 to avoid being top-heavy. The upper fixing plate 2 is fixed to the top of the oil pipe by a flange 6. The upper fixing plate 2 includes a plurality of upper splicing card plates 21. Through holes and upper connecting auxiliary plates 22 are arranged between adjacent upper splicing card plates 21. The upper connecting auxiliary plates 22 are arranged between the through holes. The aperture of the through hole matches the diameter of the oil pipe. The number of upper splicing card plates 21 is the same as that of lower splicing card plates 11.

[0018] The lower fixed plate 1 is connected to the fixed piles through three or four mooring cables. The fixed piles are suction piles or small tugboats, and three or four fixed piles are provided.

[0019] The method of using the temporary fixing device for oil pipes on offshore oil production platforms is as follows.

[0020] When dismantling an offshore oil production platform, first dismantle the riser brackets of each layer, but do not dismantle the lowest deck, then install the flange 6 on the oil pipe slightly above the water surface, and install the lower splicing pallet 11 on the lower side of the flange 6. The number of lower splicing pallets 11 depends on the number of layers of the oil pipe. If there is a single row or single layer of oil pipe, two lower splicing pallets 11 are needed, if there are double rows or double layers of oil pipe, three lower splicing pallets 11 are needed, if there are three rows or three layers of oil pipe, four lower splicing pallets 11 are needed, and so on.

[0021] The lower splicing card plates 11 have corresponding notches on the splicing sides, and the notches of the two lower splicing card plates 11 are spliced ​​into a through hole. The number of through holes is consistent with the number of oil pipes. After the lower splicing card plates 11 are spliced, they are first riveted to the flange 6, and then riveted and reinforced through multiple lower connection auxiliary plates 12 perpendicular to the axis of the oil pipe through a nut structure.

[0022] Then, pontoons 3 are installed on both sides of the lower splicing card plate 11. Since it faces the buoyancy tower platform, the space between the two pontoons is required to be sufficient to avoid hitting the buoyancy tower body. Each pontoon is divided into two compartments, so that the lower splicing card plate 11 is supported by the buoyancy of four compartments. The drain port of each compartment of the pontoon 3 is opened, seawater enters the compartment, and compressed air is injected into each compartment through the soft air injection pipe 4, thereby obtaining buoyancy to support the weight of the vertical section of the oil pipeline 72 and provide tension for the oil production pipe 71.

[0023] Then, three sets of simple mooring devices are arranged on the lower splicing card plate 11, and the entire oil production pipe 71 can be fixed to the external oil pipeline 72 through seabed suction piles. The mooring devices can also be connected to three small tugboats to fix the position of the entire system and save costs.

[0024] Finally, remove the bottom deck and install the upper splicing card plate 21 on the lower side of the top flange 6 of the oil pipe to fix the relative position of the oil pipeline 72 and the oil production pipe 71. The number of upper splicing card plates 21 is the same as the number of lower splicing card plates 11. There are corresponding notches on the splicing sides between the upper splicing card plates 21, and the notches of the two upper splicing card plates 21 are spliced ​​into a through hole. The number of through holes is the same as the number of oil pipes. After the upper splicing card plate 21 is spliced, it is first riveted to the flange 6, and then riveted and reinforced through a nut structure through multiple upper connection auxiliary plates 22 perpendicular to the axis of the oil pipe.

[0025] At this time, the production pipe 71 and the oil pipeline 72 have been completely separated from the platform and temporarily fixed. The vertical production pipe 71 and the oil pipeline 72 are provided with buoyancy by four cabins, and their positions are fixed by three sets of simple mooring devices.

Claims

1. Temporary fixing device for oil pipelines on offshore oil production platforms, Features: It comprises a lower fixing plate, the lower fixing plate comprises at least two lower splicing card plates, through holes are arranged between adjacent lower splicing card plates, and the aperture of the through holes matches the diameter of the oil pipe; both ends of the lower fixing plate are provided with buoyancy boxes, the bottom or lower part of the buoyancy box is provided with a drainage port, and the upper part or top part of the buoyancy box is provided with an air injection pipe; The buoyancy box comprises a front chamber and a rear chamber, the front chamber and the rear chamber are not connected, a drainage port is provided at the bottom or lower part of the front chamber, and an air injection pipe is provided at the upper part or top of the front chamber; a drainage port is provided at the bottom or lower part of the rear chamber, and an air injection pipe is provided at the upper part or top of the rear chamber; A connection auxiliary plate is provided between the lower splicing card plates; An upper fixing plate is also arranged above the lower fixing plate, and the upper fixing plate comprises at least two upper splicing card plates. Through holes are provided between adjacent upper splicing card plates, and the diameter of the through holes matches the diameter of the oil pipe; The lower fixed plate is connected to the fixed pile via a mooring cable.

2. The temporary fixing device for oil pipes on offshore oil production platforms according to claim 1, Features: A connection auxiliary plate is arranged between the upper splicing card plates.

3. The temporary fixing device for oil pipes on offshore oil production platforms according to claim 1, Features: The fixed piles are suction piles or small tugboats, and at least three fixed piles are provided.

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