CN116729557A - Wet storage and salvaging method for mooring anchor legs - Google Patents
Wet storage and salvaging method for mooring anchor legs Download PDFInfo
- Publication number
- CN116729557A CN116729557A CN202310480781.8A CN202310480781A CN116729557A CN 116729557 A CN116729557 A CN 116729557A CN 202310480781 A CN202310480781 A CN 202310480781A CN 116729557 A CN116729557 A CN 116729557A
- Authority
- CN
- China
- Prior art keywords
- chain
- working
- wet storage
- mooring
- mooring anchor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 241000251730 Chondrichthyes Species 0.000 claims description 6
- 210000000080 chela (arthropods) Anatomy 0.000 claims description 5
- 238000009736 wetting Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000037380 skin damage Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
- B63C7/16—Apparatus engaging vessels or objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
- B63B2021/505—Methods for installation or mooring of floating offshore platforms on site
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a wet storage and salvage method for mooring anchor legs, which comprises the following steps: the operation ship lays each component of the mooring anchor leg; the working ship constructor connects a wet storage rigging between the towing winch working chain and the platform chain; slowly lowering the platform chain by using a towing winch by the operation ship; when the mooring anchor legs are all lowered to the seabed, the ROV removes the connection between the towing winch working chain and the wet storage rigging under water to finish the wet storage of the whole mooring anchor legs on the seabed; when the floating production platform arrives at the oil and gas field site, preparing to salvage mooring anchor legs; the towing winch lowers the working chain to a distance from the seabed; the ROV completes a hook underwater and connects the wet storage rigging to a towing winch work chain; and the operation ship salvages and recovers the anchor legs along the wet storage route of the mooring anchor legs until the salvaging of the mooring anchor legs is completed. The invention can safely and efficiently lower the mooring anchor legs to the seabed for wet storage and can quickly pull the anchor legs back to the water surface in the later stage.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to a wet storage and salvaging method for mooring anchor legs.
Background
With the gradual trend of ocean oil and gas resource development to deep water, the application of a floating production platform and a mooring system is gradually matured, the floating production platform has obvious advantages in economy and reliability, the mooring system is one of important facilities of the floating production platform, the mooring system is used for fixing the platform on the sea surface so as to ensure the safety of the production and operation of the platform, the offshore installation of the mooring system has the characteristics of high difficulty and high risk, the installation is usually carried out in stages, the anchoring legs of the mooring system are paved and temporarily wet to the seabed before the floating production platform reaches an oil and gas field, the floating production platform is recycled and then transferred to the platform for tieing after the floating production platform reaches the oil and gas field, the risk of overbending and abrasion exists in the anchor leg tieing of the mooring system in the construction process when the platform is wet to be salvaged, and the skin damage risk caused by dragging is caused, meanwhile, the polyester cable is light in the water and is easily influenced by underflow, and the salvage, transfer and tieing process working conditions are complex.
Disclosure of Invention
The invention aims to provide a wet storage and salvage method for mooring anchor legs, which can safely and efficiently lower the mooring anchor legs to the seabed wet storage and can quickly salvage the anchor legs back to the water surface in the later stage.
In order to achieve the purpose of the invention, the invention provides a mooring anchor leg wet storage and salvage method, which comprises the following steps:
s1, paving each component of mooring anchor legs of the operation ship until a platform chain at the tail end of each mooring anchor leg reaches the tail part of a deck of the operation ship, and locking the platform chain by using shark pincers of the operation ship;
s2, a constructor of the operation ship connects a wet storage rigging between a towing winch working chain and a platform chain;
s3, slowly lowering a platform chain by using a towing winch by the operation ship, and lowering the mooring anchor legs to the seabed according to a designed route;
s4, after the mooring anchor legs are all lowered to the seabed, the ROV removes connection between a towing winch working chain and the wet storage rigging under water, so as to finish the wet storage of the whole mooring anchor legs on the seabed;
s5, when the floating production platform reaches the oil-gas field site and has the operation condition of tie-back of the mooring anchor legs, the operation ship returns to the wet position of the mooring anchor legs again, and the salvaging of the mooring anchor legs is prepared;
s6, installing an ROV hook at the tail end of a working chain of a towing winch of the operation ship, and lowering the working chain to a position about 5m away from the sea floor by the towing winch;
s7, the ROV completes a hook underwater, and the wet storage rigging is connected to a towing winch working chain through the ROV hook;
s8, the operation ship salvages and recovers the mooring legs along the wet storage route of the mooring legs until the salvaging of the mooring legs is completed.
As a preferable technical scheme of the invention, in the step S2, a section of small-size working chain is arranged on the towing winch of the working ship, the length of the working chain is slightly larger than the water depth of the oil-gas field, and the size of the working chain is smaller than the size of the anchor chain of the mooring anchor leg.
As an optimal technical scheme of the invention, the wet storage rigging adopts a high-modulus polyethylene limiting rope, one end of the wet storage rigging is connected to a chain ring at the tail end of the platform chain, the other end of the wet storage rigging is connected with the working chain, and a plurality of floating balls are arranged on the wet storage rigging near the working chain side.
As a preferable technical scheme of the invention, the floating ball provides static buoyancy under water which is larger than the weight setting of the wet storage rigging in water.
As a preferred solution of the invention, in step S6, an auxiliary lifting cable of a crane is installed at a link at a position of about 6m from the end of the working chain of the hauling winch of the working vessel, the working vessel crane is lowered, the ROV connects the crane to the auxiliary lifting cable on the working chain under water, the crane is forced and the heave compensation function is activated, and the hauling winch slowly lowers the ROV hook on the working chain above the wet storage cable.
In step S8, when the platform chain at the end of the mooring anchor leg is recovered to the deck of the working ship, the platform chain is locked by the shark jaw, so that the salvaging of the mooring anchor leg is completed, and the subsequent transfer and tie-back operation of the mooring anchor leg can be performed.
Compared with the prior art, the invention provides a wet storage and salvage method for mooring anchor legs, which has the following beneficial effects:
the invention provides a deepwater floating platform mooring anchor leg wet storage and salvage method, which can safely and efficiently lower the mooring anchor leg to the seabed wet storage and can quickly salvage the anchor leg back to the water surface in the later period.
Drawings
FIG. 1 is a schematic view of a wet storage structure of a mooring leg of the present invention on the seabed;
FIG. 2 is a schematic illustration of the deck of the work vessel of the present invention prior to wet existence of mooring legs;
FIG. 3 is a schematic illustration of the work vessel towing winch work chain of the present invention connected to a mooring anchor leg platform chain;
FIG. 4 is a schematic illustration of a mooring leg wet storage rigging of the present invention;
FIG. 5 is a schematic illustration of a work vessel tow winch work chain fishing rigging of the present invention;
FIG. 6 is a schematic illustration of a work vessel hoist link work chain auxiliary lifting rigging of the present invention;
FIG. 7 is a schematic illustration of a work vessel of the present invention salvaging recovered mooring legs;
fig. 8 is a schematic illustration of the present invention mooring legs being fished to a work vessel and secured.
The mooring rope is characterized in that the mooring rope is 1 in mooring rope legs, 2 in wet storage rigging, 3 in ROV hooks, 4 in auxiliary lifting rigging and 5 in floating balls.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-8, an embodiment of the present invention provides a method for wetting and salvaging mooring legs, comprising the steps of:
s1, paving each component of a mooring anchor leg 1 by a working ship until a platform chain at the tail end of the mooring anchor leg 1 reaches the tail part of a deck of the working ship, and locking the platform chain by using shark pincers of the working ship;
s2, a constructor of the working ship connects a wet storage rigging 2 between a towing winch working chain and a platform chain;
s3, slowly lowering a platform chain by using a towing winch by the operation ship, and lowering the mooring anchor legs 1 to the seabed according to a designed route;
s4, after the whole mooring anchor leg 1 is lowered to the seabed, the ROV removes the connection between the towing winch working chain and the wet storage rigging 2 under water, so as to finish the wet storage of the whole mooring anchor leg on the seabed;
s5, when the floating production platform reaches the oil-gas field site and has the operation condition of tie-back of the mooring anchor legs, the operation ship returns to the wet position of the mooring anchor legs 1 again, and the salvaging of the mooring anchor legs 1 is prepared;
s6, installing an ROV hook 3 at the tail end of a working chain of a towing winch of the operation ship, and lowering the working chain to a position about 5m away from the sea bottom by the towing winch;
s7, the ROV completes a hook underwater, and the wet storage rigging 2 is connected to a towing winch working chain through the ROV hook 3;
s8, the operation ship salvages and recovers the anchor legs along the wet storage route of the mooring anchor legs 1 until the salvaging of the mooring anchor legs 1 is completed.
In one embodiment of the invention, in step S2, a small-sized working chain is mounted on the tug winch of the working vessel, the length of the working chain being slightly larger than the water depth of the field, the size of the working chain being smaller than the size of the anchor chain of the mooring leg 1.
In one embodiment of the invention, the wet storage rigging 2 adopts a high-modulus polyethylene limiting rope, one end of the wet storage rigging 2 is connected to a chain ring at the tail end of the platform chain, the other end of the wet storage rigging 2 is connected with the working chain, and a plurality of floating balls 5 are arranged on the side, close to the working chain, of the wet storage rigging 2.
In one embodiment of the invention, the floating ball 5 provides a static buoyancy under water that is greater than the weight setting of the wet storage rigging 2 in water.
In one embodiment of the invention, in step S6, a crane auxiliary lift cable 4 is installed at the link at about 6m position at the end of the working chain of the working vessel hauling winch, the working vessel crane is lowered, the ROV is connected to said auxiliary lift cable 4 on the working chain under water, the crane is forced and the heave compensation function is activated, the hauling winch slowly lowers said ROV hook 3 on the working chain above said wet storage cable 2.
In one embodiment of the present invention, in step S8, when the platform chain at the end of the mooring anchor leg 1 is recovered to the deck of the working ship, the platform chain is locked by using shark pincers, so as to complete the salvaging of the mooring anchor leg, and the subsequent transferring and tie-back operation of the mooring anchor leg can be performed.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.
Claims (6)
1. The wet storage and salvaging method for the mooring anchor leg is characterized by comprising the following steps of:
s1, paving each component of a mooring anchor leg (1) by a working ship until a platform chain at the tail end of the mooring anchor leg (1) reaches the tail part of a deck of the working ship, and locking the platform chain by using shark pincers of the working ship;
s2, a constructor of the working ship connects a wet storage rigging (2) between a towing winch working chain and a platform chain;
s3, slowly lowering a platform chain by using a towing winch by the operation ship, and lowering the mooring anchor legs (1) to the seabed according to a designed route;
s4, after the mooring anchor legs (1) are completely lowered to the seabed, the ROV removes the connection between the towing winch working chain and the wet storage rigging (2) under water, so as to finish the wet storage of the whole mooring anchor legs on the seabed;
s5, when the floating production platform reaches the oil-gas field site and has the operation condition of tie-back of the mooring anchor legs, the operation ship returns to the wet position of the mooring anchor legs (1) again, and the salvaging of the mooring anchor legs (1) is prepared;
s6, installing an ROV hook (3) at the tail end of a working chain of a towing winch of the working ship, and lowering the working chain to a position about 5m away from the sea floor by the towing winch;
s7, the ROV completes a hook underwater, and the wet storage rigging (2) is connected to a towing winch working chain through the ROV hook (3);
s8, the operation ship salvages and recovers the anchor legs along the wet storage route of the mooring anchor legs (1) until the salvaging of the mooring anchor legs (1) is completed.
2. The method for wetting and salvaging mooring legs according to claim 1, wherein the method comprises the steps of:
in step S2, a working chain with a small size is installed on the towing winch of the working ship, the length of the working chain is slightly larger than the water depth of the oil-gas field, and the size of the working chain is smaller than the size of the anchor chain of the mooring anchor leg (1).
3. A method of wet storage and salvaging of mooring legs according to claim 2, wherein:
the wet storage rigging (2) adopts a high-modulus polyethylene limiting rope, one end of the wet storage rigging (2) is connected to a chain ring at the tail end of the platform chain, the other end of the wet storage rigging (2) is connected with the working chain, and a plurality of floating balls (5) are arranged on the side, close to the working chain, of the wet storage rigging (2).
4. A method of wet storage and salvaging of mooring legs according to claim 3, characterized by:
the static buoyancy provided by the floating ball (5) under water is larger than the weight setting of the wet storage rigging (2) under water.
5. The method for wetting and salvaging mooring legs according to claim 1, wherein the method comprises the steps of:
in step S6, a crane auxiliary lifting rigging (4) is mounted at a chain ring at a position of about 6m at the end of a working chain of a hauling winch of a working vessel, a working vessel crane is lowered, an ROV connects the crane to the auxiliary lifting rigging (4) on the working chain under water, the crane is forced and a heave compensation function is started, and the hauling winch slowly lowers the ROV hook (3) on the working chain to above the wet storage rigging (2).
6. The method for wetting and salvaging mooring legs according to claim 1, wherein the method comprises the steps of:
in step S8, when the platform chain at the end of the mooring anchor leg (1) is recovered to the deck of the working ship, the platform chain is locked by the shark pincers, so that the salvaging of the mooring anchor leg is completed, and the subsequent transferring and tieback operation of the mooring anchor leg can be performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310480781.8A CN116729557A (en) | 2023-04-28 | 2023-04-28 | Wet storage and salvaging method for mooring anchor legs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310480781.8A CN116729557A (en) | 2023-04-28 | 2023-04-28 | Wet storage and salvaging method for mooring anchor legs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116729557A true CN116729557A (en) | 2023-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310480781.8A Pending CN116729557A (en) | 2023-04-28 | 2023-04-28 | Wet storage and salvaging method for mooring anchor legs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116729557A (en) |
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2023
- 2023-04-28 CN CN202310480781.8A patent/CN116729557A/en active Pending
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