CN216269827U - Offshore single point mooring replacement maintenance equipment - Google Patents
Offshore single point mooring replacement maintenance equipment Download PDFInfo
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- CN216269827U CN216269827U CN202122373421.7U CN202122373421U CN216269827U CN 216269827 U CN216269827 U CN 216269827U CN 202122373421 U CN202122373421 U CN 202122373421U CN 216269827 U CN216269827 U CN 216269827U
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Abstract
The utility model discloses offshore single-point mooring replacement and maintenance equipment which comprises a ship with a dynamic positioning system, a fixed pulley and a counterweight module, wherein a winch and a ship crane are arranged on the ship with the dynamic positioning system, the fixed pulley is arranged on an anchor pile, the counterweight module is hung on the middle upper part of an underwater anchor chain by adopting a hanging strip, and a steel wire rope of the winch is connected with the middle upper part of the underwater anchor chain by winding the fixed pulley. The anchor pile does not need to be lifted out, so that the construction process is greatly simplified; the required construction resources are simpler, and supporting facilities such as large ships and the like are not needed; the underwater operation system has the advantages of no need of anchoring, accurate positioning, strong emergency response capability and low underwater operation risk of divers; the construction cost is low, and is reduced by about 80 percent compared with the existing construction method; compared with the existing construction equipment, the construction equipment does not need to stop production and has no influence on production operation. In conclusion, the utility model can safely and efficiently eliminate the hidden danger of the single point mooring structure and keep the safe production of the offshore facility.
Description
Technical Field
The utility model relates to maintenance equipment of a single point mooring system, in particular to replacement maintenance equipment of offshore single point mooring.
Background
The single point mooring system is matched with the floating production oil storage device and the oil storage wheel to carry out outward transportation operation, the outward transportation mode is suitable for the exploitation and production of the marginal oil fields with small storage capacity and scattered distribution, and has the advantages of less investment, quick effect, reusability and the like, the ship does not need to be greatly modified during outward transportation, and the installation is quick. But also has the defects of less storage, frequent export, larger influence of weather and ocean current during export, high mooring risk coefficient, small tonnage of moored ships, oil tanker collision with a platform during export, continuous severe weather, oil field production pressure, production halt, larger anchor chain abrasion and the like.
According to the detection results of a mooring system of a certain platform in recent years, the positions of a pin shaft of a snap ring of an underwater anchor chain, an anchor chain, a connecting snap ring and the like are seriously abraded due to ocean currents, mooring stress and the like, so that the problem can cause the loss of a buoy or the failure of mooring due to the positioning failure of the anchor chain, the threat to the production and the export operation of an oil field can be caused in serious cases, and even serious environmental pollution, the collision of an oil tanker platform and other serious risks can be caused, and the method belongs to serious risk potential hazards.
The current hidden danger treatment method mainly comprises the steps of replacing an underwater connecting anchor chain and a snap ring or replacing an integral single-point mooring facility.
The conventional maintenance needs to use large-scale floating cranes and ship facilities, and has long construction period, high risk and high cost.
The following disadvantages mainly exist:
1) the method needs a whole set of large equipment such as a large floating crane, a tugboat, an anchor throwing boat, a pile driver and the like.
2) The working period is long, the normal production operation of the offshore facility is seriously influenced, and the platform is required to be stopped for production and matched when being maintained and replaced;
3) the operation risk is high, the change of the sea weather is constant, the anchor walking and emergency anchor taking-off and evacuation time in severe weather is long, part of the area is close to the platform, and the collision risk of the platform is large;
4) the construction resource requirement is high, large-scale equipment such as a floating crane ship is needed, and the overall construction cost is high.
Disclosure of Invention
The utility model provides a replacement and maintenance device for offshore single-point mooring, which solves the technical problems in the prior art, does not need to use large floating cranes and ship facilities, and has short construction period, low risk and low cost.
The technical scheme adopted by the utility model for solving the technical problems in the prior art is as follows: the utility model provides a maintenance equipment is changed in marine single-point mooring, includes boats and ships, fixed pulley and the counter weight module that has dynamic positioning system be equipped with winch and boat crane on the boats and ships that have dynamic positioning system, the fixed pulley is installed on the anchor pile, the counter weight module adopts the suspender to hang the well upper portion at the anchor chain under water, the wire rope of winch twines through the fixed pulley is connected with the well upper portion of anchor chain under water.
The utility model has the advantages and positive effects that:
1) simple and efficient: anchor piles do not need to be lifted out, and the construction process is greatly simplified.
2) Construction resources: the utility model needs simpler construction resources and does not need supporting facilities such as large ships and the like.
3) Safety: the utility model has the advantages of no need of anchoring, accurate positioning, strong emergency response capability and low underwater operation risk of divers.
4) Construction cost: the construction cost is low, and is reduced by about 80 percent compared with the existing construction method.
5) The production influence is: compared with the existing construction equipment, the construction equipment does not need to stop production and has no influence on production operation.
In conclusion, the method has the advantages of low cost, low construction resource requirement and high construction efficiency; the construction safety is high; the method has no influence on the production condition of the existing oil field, can safely and efficiently eliminate the hidden danger of the single point mooring structure, and keeps the safe production of offshore facilities.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a vessel having a dynamic positioning system; 2. hoisting by a ship; 3. a wire rope; 4. a fixed pulley; 5. anchoring piles; 6. A float bowl; 7. an underwater anchor chain; 8. a sling; 9. a counterweight module.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1, the offshore single-point mooring replacement maintenance equipment comprises a ship 1 with a dynamic positioning system, a fixed pulley 4 and a counterweight module 9, wherein the ship 1 with the dynamic positioning system is provided with a winch and a ship crane 2, the fixed pulley 4 is installed on an anchor pile 5, the counterweight module 9 is hung on the middle upper part of an underwater anchor chain 7 by adopting a hanging strip 8, and a steel wire rope 3 of the winch is connected with the middle upper part of the underwater anchor chain 7 by winding the fixed pulley 4.
The method for replacing and maintaining the offshore single-point mooring by adopting the equipment comprises the following steps:
1) the middle upper part of the underwater anchor chain 7 is connected with a hanging strip 8, the anchor pile 5 is provided with a fixed pulley 4, and the lower end of the hanging strip 8 is connected with a counterweight module 9, so that the buoy 6 achieves neutral buoyancy.
2) And a steel wire rope 3 on the winch is put into water, is turned around the fixed pulley 4 and then is connected with the middle upper part of the underwater anchor chain 7. The winch is mounted on a vessel 1 with a dynamic positioning system, and a steel wire rope 3 on the winch plays a role in towing a mooring structure containing an underwater anchor chain 7.
3) And (3) tightening the steel wire rope to enable the buoy 6 to move downwards, and after the lower end of the underwater anchor chain 7 is loosened, the diver is matched to release the snap ring for connecting the underwater anchor chain 7 and the anchor pile 5, so that the underwater anchor chain 7 is separated from the anchor pile 5.
4) And (3) loosening the steel wire rope 3 to enable the underwater anchor chain 7 and the buoy 6 to float up to the water surface under the control of the steel wire rope 3.
5) And (3) dismantling the counterweight module 9, and completing the replacement of the buoy 6 and/or the underwater anchor chain 7 under the cooperation of the ship crane 2 to obtain a new mooring structure. The buoy 6 is turned and fixed by using the ship crane and the steel wire rope for assistance, and the anchor chain is replaced or the mooring structure is integrally replaced.
When the buoy 6 and the underwater anchor chain 7 need to be replaced, the buoy and the underwater anchor chain can be lifted on a ship deck with a dynamic positioning system, and the replacement is completed on the deck. When the buoy 6 is not replaced, only the underwater anchor chain 7 is replaced, and the operation can be carried out on the water surface without hoisting the deck.
6) Before the new mooring structure is lowered, the counterweight module 9 is connected to the middle upper part of the underwater anchor chain of the new mooring structure on the water surface.
7) And (3) tightening the steel wire rope 3, moving the new mooring structure and the counterweight module 9 to the anchor pile 5 under the traction of the steel wire rope 3, and connecting the underwater anchor chain of the new mooring structure with the anchor pile 5 by using a clamping ring when a diver launches water.
8) And (4) releasing the counterweight module 9 and the steel wire rope 3, floating the buoy of the new mooring structure to the designed position, and finishing the replacement of the underwater mooring structure.
The comparison table of the equipment and the conventional maintenance equipment in the aspects of equipment allocation, personnel allocation, construction period cost and risk is adopted for replacing the underwater anchor chain:
the method effectively improves the potential hazard treatment capability of the single-point mooring facility, and saves the cost by 80 percent compared with the existing construction method with the cost of more than 1000 ten thousand yuan.
The counterweight scheme of the counterweight module and the path of the traction type steel wire rope need to be analyzed, calculated and determined according to the original file of the single-point mooring device and by combining the actual engineering situation and considering factors such as buoyancy, seabed, flow velocity, counterweight, anchor chain length and the like.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (1)
1. The marine single-point mooring replacement and maintenance equipment is characterized by comprising a ship with a dynamic positioning system, a fixed pulley and a counterweight module, wherein a winch and a ship crane are arranged on the ship with the dynamic positioning system, the fixed pulley is arranged on an anchor pile, the counterweight module is hung on the middle upper part of an underwater anchor chain by adopting a hanging strip, and a steel wire rope of the winch winds through the fixed pulley and is connected with the middle upper part of the underwater anchor chain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122373421.7U CN216269827U (en) | 2021-09-28 | 2021-09-28 | Offshore single point mooring replacement maintenance equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122373421.7U CN216269827U (en) | 2021-09-28 | 2021-09-28 | Offshore single point mooring replacement maintenance equipment |
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| CN216269827U true CN216269827U (en) | 2022-04-12 |
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| CN202122373421.7U Active CN216269827U (en) | 2021-09-28 | 2021-09-28 | Offshore single point mooring replacement maintenance equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113772044A (en) * | 2021-09-28 | 2021-12-10 | 中海石油技术检测有限公司 | Offshore single-point mooring replacement and maintenance method |
| CN114872829A (en) * | 2022-04-21 | 2022-08-09 | 中交第四航务工程勘察设计院有限公司 | Anchoring construction method and system for operation ship and steel pile driving ship |
-
2021
- 2021-09-28 CN CN202122373421.7U patent/CN216269827U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113772044A (en) * | 2021-09-28 | 2021-12-10 | 中海石油技术检测有限公司 | Offshore single-point mooring replacement and maintenance method |
| CN113772044B (en) * | 2021-09-28 | 2023-10-31 | 中海石油技术检测有限公司 | Offshore single point mooring replacement maintenance method |
| CN114872829A (en) * | 2022-04-21 | 2022-08-09 | 中交第四航务工程勘察设计院有限公司 | Anchoring construction method and system for operation ship and steel pile driving ship |
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