CN114620196B - Jacket buoy device and three-leg jacket installation method with buoy device - Google Patents
Jacket buoy device and three-leg jacket installation method with buoy device Download PDFInfo
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- CN114620196B CN114620196B CN202210331627.XA CN202210331627A CN114620196B CN 114620196 B CN114620196 B CN 114620196B CN 202210331627 A CN202210331627 A CN 202210331627A CN 114620196 B CN114620196 B CN 114620196B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B75/00—Building or assembling floating offshore structures, e.g. semi-submersible platforms, SPAR platforms or wind turbine platforms
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Abstract
The invention relates to a jacket buoy device and a three-leg jacket installation method with the same, wherein the jacket buoy device comprises a buoy, an upper connecting piece and a lower connecting piece, a cavity is arranged in the buoy, and two ends of the buoy are provided with buoy end sealing plates for sealing the buoy; one end of the upper connecting piece is arranged at the upper part of the buoy, and the other end of the upper connecting piece is connected with one end of a conduit frame leg of the conduit frame; one end of the lower connecting piece is arranged at the lower part of the buoy, and the other end of the lower connecting piece is connected with the other end of the guide pipe frame leg of the guide pipe frame through the bolt component; the jacket buoy device can effectively control the overturning direction of the three-leg jacket after being hoisted and launched, improves the floating state and the residual buoyancy of the three-leg jacket, and avoids the collision risk between the three-leg jacket and the floating crane ship.
Description
Technical Field
The invention relates to the technical field of marine oil and gas development equipment, in particular to a jacket buoy device suitable for marine marginal oil and gas field development and a three-leg jacket installation method with the buoy device.
Background
A large number of marginal oil and gas fields are to be developed in the east sea area, the marginal oil and gas fields are small in reserve scale, a jacket is usually used in development, the three-leg jacket is simple in structure and low in cost, the three-leg jacket is mainly applied to development of gasoline fields in shallow sea areas (the water depth is less than 40 m), and the three-leg jacket is vertically constructed and vertically hoisted to be installed under water in the shallow sea areas. The water depth of the east-sea steam oil field is 80-110 m, the jacket used in the current gasoline field development is a jacket structure with four legs or more, but the cost of the jacket with four legs or more is higher.
The three-leg conduit frame is applied in the water depth range of 80-110 m, so that the engineering investment can be obviously reduced. The jacket is only constructed horizontally, shipped and towed under the limitation of the overall height of the jacket and the hoisting height of the floating crane. When the jacket is installed, a four-point horizontal hanging underwater mode is usually adopted for the small four-leg jacket, and the posture of the jacket is stable after the jacket enters the water. And the three-leg jacket turns over after being horizontally hung into water until a certain side faces upwards to reach a stable state. Because the upset direction is uncertain, in case the jacket then has the risk of colliding with the floating pontoon to the upset of floating pontoon direction to be unfavorable for righting the tool to lock and the installation of righting the tool to lock platform.
Therefore, a device is needed to control the floating state and the turning direction of the three-leg jacket at sea when the three-leg jacket is installed, so that the three-leg jacket can be applied to development of marginal oil and gas fields with water depth ranging from 80m to 110 m.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a jacket-buoy device and a method for installing a three-legged jacket with a buoy device, which can control the floating state and the turning direction of the three-legged jacket on the sea during installation, and reduce the development cost of marginal oil and gas fields with water depth ranging from 80m to 110 m.
In order to achieve the purpose, the invention adopts the following technical scheme:
a jacket buoy apparatus, comprising:
the inner part of the floating barrel is provided with a cavity, and two ends of the floating barrel are provided with floating barrel end sealing plates for sealing the floating barrel;
one end of the upper connecting piece is arranged at the upper part of the buoy, and the other end of the upper connecting piece is connected with one end of a conduit frame leg of the conduit frame;
and one end of the lower connecting piece is arranged at the lower part of the buoy, and the other end of the lower connecting piece is connected with the other end of the conduit frame leg of the conduit frame through a bolt component.
Preferably, the bolt component comprises a male bolt head and a female bolt head, the male bolt head is connected with the lower connecting piece, and the female bolt head is connected with the other end of the conduit frame leg of the conduit frame.
Preferably, the female plug is connected to the jacket legs of the jacket by a connecting plate.
Preferably, buoy reinforcing rings are respectively arranged at two ends of the buoy corresponding to the upper connecting piece and the lower connecting piece.
Preferably, a plurality of buoy hydrostatic crushing rings are arranged at intervals along the length direction of the buoy.
Preferably, a cabin sealing partition plate for partitioning the inner cavity is arranged inside the buoy.
Preferably, the lower end of the float bowl is provided with a water inlet valve.
A method for installing a three-leg jacket with a buoy device is realized based on the jacket buoy device and comprises the following steps:
respectively installing two buoys on vertical sections of two jacket legs of a three-leg jacket;
the three-leg jacket is lifted from the barge by a floating crane and is lowered into seawater, the jacket is freely overturned under the action of buoyancy, and a plane formed between two jacket legs for mounting the buoy is upward after overturning;
arranging a righting lockset and a righting lockset platform on the plane;
and after the base bottom of the jacket is righted by using the righting lockset by using a floating crane, the two buoys are respectively detached from the two jacket legs, so that the three-leg jacket is installed.
Preferably, said hoisting and lowering said three-legged jacket from the barge into the sea by means of a floating crane comprises: the plane formed between one of the conductor frame legs to which the buoy is attached and the conductor frame leg to which the buoy is not attached is first placed in the sea.
Preferably, said removing two pontoons from each of said two conduit frame legs comprises: cutting off the part of the conduit frame leg connected with the upper connecting piece to separate the upper end of the buoy from the three-leg conduit frame; and pulling out the male plug of the plug from the female plug of the plug to separate the lower end of the buoy from the three-leg jacket.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the jacket buoy device provided by the invention has simple and direct buoyancy, can effectively control the overturning direction of the three-leg jacket after being hoisted and launched, improves the floating state and residual buoyancy of the three-leg jacket, and avoids the collision risk between the three-leg jacket and a floating crane ship;
2. the connecting structure between the float bowl device and the conduit frame leg is simple in form, one end of the connecting structure is welded, the other end of the connecting structure is of a plug pin structure, a force transmission path is clear, the connecting structure is simple in form, high in reliability and low in construction cost;
3. the buoy device is easy to disassemble after the jacket is in place, the increase of environmental load caused by the buoy in the in-place period is avoided, the underwater cutting can be avoided only by cutting a connecting structure between the water surface and the jacket during the disassembling, and the construction difficulty and the construction cost are greatly reduced;
4. the flotation pontoon device is provided with the subdivision structure and fills the water system, can reduce its buoyancy through the water injection to flotation pontoon bottom cabin before demolising, makes the whole dead weight of flotation pontoon slightly exceed its buoyancy, can effectively avoid connection structure cutting back flotation pontoon to come up suddenly or with the construction risk that the jacket bumps, is favorable to the hoist and mount to demolish simultaneously.
5. The removed buoy can be reused in subsequent projects, and a plurality of projects share the cost together, so that the investment cost is reduced.
Drawings
FIG. 1 is a schematic view of a configuration of a jacket buoy assembly coupled to jacket legs according to an embodiment of the present invention;
FIG. 2 is a schematic view of the overall configuration of the spar arrangement and three-legged jacket of the present embodiment of the invention;
FIG. 3 is a flow chart of the three-leg jacket installation of this embodiment of the present invention;
FIG. 4 is a partial schematic view of the latch assembly of the present embodiment of the invention;
FIG. 5 is a plan view of a connecting plate structure according to the embodiment of the present invention;
fig. 6 is a sectional view showing a male plug and female plug connecting structure according to the embodiment of the present invention.
In the drawings, the reference numbers:
the structure comprises a buoy, an upper connecting piece, a lower connecting piece, a buoy end sealing plate, a bolt assembly, a bolt female head 501, a bolt male head 502, a bolt male head 503, a bolt male head annular plate 503, a connecting plate 6, a buoy reinforcing ring 7, a buoy hydrostatic crushing ring 8, a cabin sealing partition plate 9, a first conduit frame leg 21, a second conduit frame leg 22, a third conduit frame leg 23, a cutting section 24, a conduit frame horizontal layer cross brace 25 and a conduit frame vertical face diagonal brace 26.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "assembled", "disposed" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
According to the jacket buoy device and the three-leg jacket installation method with the buoy device, provided by the invention, the buoy is installed on the three-leg jacket, the floating state and the overturning direction of the three-leg jacket on the sea can be controlled during installation, the installation difficulty of the three-leg jacket is reduced, and the development cost of a marginal oil-gas field with the water depth range of 80-110 m is reduced.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Examples
Referring to fig. 1, the jacket buoy device provided in the present embodiment includes a buoy 1, an upper connector 2, and a lower connector 3; the floating pontoon 1 can be a cylinder or a square barrel, is made of stainless steel, is internally provided with a cavity, and both ends of the floating pontoon 1 are provided with floating pontoon end sealing plates 4 for sealing the end part of the floating pontoon 1 to avoid seawater from entering and ensure that the floating pontoon 1 can play a role of providing residual buoyancy; the upper connecting piece 2 is specifically a first buoy connecting rod, one end of the upper connecting piece is welded on the upper part of the buoy 1, and the other end of the upper connecting piece is welded and connected with one end of a guide pipe frame leg of the guide pipe frame; the lower connecting piece 3 is specifically a second buoy connecting rod, one end of the lower connecting piece is welded on the lower part of the buoy 1, and the other end of the lower connecting piece 3 is connected with the other end of the conduit frame leg of the conduit frame through a bolt component 5.
In this implementation, the upper portion of the float 1 is connected to the top cutting section 24 of the conduit frame leg through the upper connecting piece 2 by welding, the lower portion of the float 1 is connected with the plug pin assembly 5 through the lower connecting piece 3, the plug pin assembly 5 is composed of a plug pin female head 501 and a plug pin male head 502, the plug pin female head 501 is connected with the conduit frame leg of the conduit frame through the connecting plate 6, the connecting plate 6 is a yoke plate, the structure of the yoke plate is as shown in fig. 5, and the plug pin male head 502 is connected with the lower portion of the float 1 through the lower connecting piece 3. Because the joint positions of the horizontal layer cross braces 25 and the vertical surface diagonal braces 26 of the jacket and the jacket legs are connected, the number of structural components is large, and the structural style is complex, the joint positions of the upper connecting piece 2 and the connecting plate 6 and the jacket legs are required to be avoided.
In this implementation, correspond on the both ends of flotation pontoon 1 and go up connecting piece 2 and connecting piece 3 punishment and be provided with flotation pontoon beaded finish 7 respectively, guaranteed flotation pontoon 1 and last connecting piece 2 and the node intensity of connecting position of connecting piece 3 down.
In this implementation, for making flotation pontoon 1 provide surplus buoyancy as much as possible under the same circumstances of steel volume, the barrel wall thickness of flotation pontoon 1 is thinner usually, and the footpath thickness ratio of barrel is great, and during the jacket hoist and mount was launched and is right, partial buckling and then lead to hydrostatic head to collapse and destroy under hydrostatic pressure effect barrel probably appeared. A plurality of buoy hydrostatic crushing rings 8 are arranged at intervals along the length direction of the buoy 1, so that the strength of the buoy 1 is ensured.
Referring to fig. 2, in the present embodiment, the jacket buoy apparatus is installed on a three-leg jacket, the three-leg jacket is suitable for development of marginal oil and gas fields with a water depth ranging from 80m to 110m, the three-leg jacket is provided with three jacket legs, namely a first jacket leg 21, a second jacket leg 22 and a third jacket leg 23, the upper portions of the three jacket legs adopt straight legs, and the lower portions of the three jacket legs adopt inclined legs, so that the structural size in a wave main action area is reduced, and further the wave force borne by the three-leg jacket is reduced. The straight leg ends of the three guide pipe frames are the tops, the floating cylinder devices are installed at the straight leg ends of the tops of the three guide pipe frames, the floating cylinder devices are respectively installed at the vertical sections of the straight legs of the first guide pipe frame leg 21 and the second guide pipe frame leg 22, and the floating cylinders 1 are parallel to the vertical sections of the straight legs.
Referring to fig. 3, the method for installing the three-leg jacket with the buoy device by using the jacket buoy device provided by the embodiment can comprise the following steps:
step S1: installing two buoys 1 on the vertical sections of two conduit frame legs of a three-leg conduit frame respectively;
step S2: the three-leg jacket is lifted from the barge by the floating crane and is lowered into seawater, the jacket is freely overturned under the action of buoyancy, and the plane where the two jacket legs of the buoy 1 are arranged is upward after overturning;
and step S3: arranging a righting lockset and a righting lockset platform on a plane;
and step S4: after a base of the three-leg jacket is righted by using the floating crane ship through the righting lockset, the two buoys 1 are respectively detached from the two jacket legs, and the three-leg jacket is installed.
In this embodiment, specifically, referring to fig. 2, the overall height of the three-leg jacket and the lifting capacity of the offshore floating crane resources are limited, the three-leg jacket is constructed horizontally, a support structure is arranged on a plane formed by the first jacket leg 21 and the third jacket leg 22, and horizontal construction, sliding shipment and towing of the three-leg jacket are performed depending on the plane. The first 21, second 22 and third 23 conduit frame legs form a triangular frame, the first 21 and third 23 conduit frame legs lie in a plane parallel to the deck surface of the transport barge, and the second 22 conduit frame leg is located above the centre line between the first 21 and third 23 conduit frame legs, i.e. at the top of the triangular frame. When the three-leg jacket is installed on the sea, two hoisting points are arranged on a second jacket leg 22 at the top of the triangular frame, the jacket is hoisted from a barge by a floating crane and is lowered into the sea, and the planes of a first jacket leg 21 and a third jacket leg 23 enter the water firstly in the lowering process. The three-leg jacket is in a loose state after entering water, the three-leg jacket is in free-state overturning under the action of buoyancy, and due to the fact that the buoy 1 is arranged on the first jacket leg 21 and the buoyancy force applied to the first jacket leg is larger than that of the third jacket leg 23, the three-leg jacket is finally overturned to the upward plane where the two buoys 1 are arranged under the action of extra buoyancy force provided by the buoy 1, namely the upward plane where the first jacket leg 21 and the second jacket leg 22 are arranged, specifically, the plane floats on the sea surface, and the centering lock platform can be arranged on the plane. Under the effect of the buoy 1, the overturning direction of the three-leg jacket after launching is actively controlled, and the three-leg jacket can be prevented from overturning towards the floating crane ship, so that the risk of collision between the three-leg jacket and the floating crane ship is avoided. Because the remaining buoyancy of three-leg jacket can not satisfy the standard requirement usually, the top structure of three-leg jacket is less than bottom structure size, and the buoyancy that the top can provide is less relatively, if do not set up flotation pontoon 1 then launch and can sink below the surface of water when reaching the steady state little head end, its buoyancy is unfavorable for hanging to detain and rights the tool to lock. Through setting up flotation pontoon 1, can make the remaining buoyancy of three-leg jacket satisfy the standard requirement, three-leg jacket top can slightly perk out of the water surface under 1 buoyancy of flotation pontoon effect, is favorable to righting the tool to lock and hangs the knot.
In this embodiment, the buoy 1 has a large geometric dimension and is located in a main area under the action of waves, and if the buoy is not removed, the environmental load borne by the jacket during the in-place period can be significantly increased, and serious adverse effects are caused on the strength of the jacket and the bearing capacity of a pile foundation. After the three-legged jacket is completely centered in place, the two buoys 1 need to be detached from the two jacket legs, and with reference to fig. 1, the jacket leg top cutting sections 24 are cut according to the designed elevation of the top of the three-legged jacket. Because the upper connecting piece 2 is welded with the guide pipe frame leg top cutting section 24, the guide pipe frame leg top cutting section 24 needs to be cut and removed, the upper connecting piece 2 does not need to be cut when the buoy 5 is removed, the guide pipe frame leg top cutting section 24 and the buoy device are integrally removed after cutting, and the cutting construction period and the related cost can be reduced. The cutting position of the cutting section 24 at the top of the conduit frame leg is above the water surface, conventional carbon-oxygen flame cutting can be adopted, the cutting difficulty is low when the buoy 1 is detached, the speed is high, and the personnel and equipment cost is low. After the three-leg jacket is righted in place, the lower part of the buoy 1 can be immersed in seawater, the underwater section of the buoy 1 is connected with the three-leg jacket through the bolt component 5, after the cutting of the cutting section 24 at the top of the jacket leg, the buoy device is lifted upwards only by using the floating crane, so that the male plug 502 and the female plug 501 can be separated freely, the male plug 502 is integrally detached along with the buoy 1, divers do not need to perform any underwater cutting, the detaching difficulty of the buoy 1 is reduced, and the cost of personnel and equipment is reduced.
In this embodiment, after the three-leg jacket is completely centered in place, since part of the barrel of the buoy 1 is immersed in seawater, the buoyancy force borne by the buoy 1 may exceed its own weight, after the cutting section 24 is cut, the buoy 1 may suddenly float up under the action of the buoyancy force, and the male plug 502 connected to the lower section of the buoy may automatically separate from the female plug 501, which may bring a safety risk to the cutting personnel; the buoy 1 is not controlled after completely disconnecting from the jacket, and the posture of the buoy is difficult to maintain in a vertical state, so that the buoy may collide with the three-leg jacket to cause construction risks. In order to avoid personnel safety risk and construction risk in the process of cutting and dismantling the buoy 1, the inner part of the buoy 1 is provided with a buoy inner cabin sealing partition plate 9 for dividing the inner space of the buoy 1, the lower end of the buoy 1 is provided with a water inlet valve, and the buoy 1 barrel is provided with a water filling pipeline which can share the same water filling control system with a three-leg jacket water filling pipeline. Before the buoy 1 is dismantled, a water inlet valve arranged on the buoy 1 is opened through a water filling control system, water filling is stopped when water filled in a cylinder body of the buoy 1 slightly exceeds the self weight of the cylinder body, and then the cutting section 24 is cut. After the cutting is accomplished, because flotation pontoon 1 dead weight only slightly exceeds the buoyancy that flotation pontoon 1 received, both are close balanced state, and the floating crane only need provide a small amount of vertical load this moment and can make the public head 502 of bolt break away from the female head 501 of bolt, and then hoists the flotation pontoon device and demolish. The detached buoy device can be recycled on a subsequent similar three-leg jacket, so that the repeated utilization is realized, and the single use cost of the buoy device is reduced.
Referring to fig. 4, in this embodiment, the female plug 501 is formed by a section of circular tube, the upper section of the circular tube is connected to the conduit frame leg through one connecting plate 6, and the lower section of the circular tube is connected to the conduit frame leg through another connecting plate 6. The connecting rib plates are arranged between the upper connecting plate 6 and the lower connecting plate 6 and between the bolt female heads 501, so that the effect of strengthening connection and ensuring the connection strength is achieved. The male plug 501 is inserted inside the female plug 501.
In this embodiment, the first conduit frame leg 21 or the second conduit frame leg 22 and the female plug 501 are surrounded by the connecting plate 6, and they are connected to form an integral structure. The web 6 serves to transfer the load on the female plug 501 to the conduit frame legs.
Referring to fig. 6, in this embodiment, an inner diameter of a circular tube of the female plug 501 is slightly larger than an outer diameter of the male plug 502, and a gap block is disposed on an inner wall of the circular tube of the female plug, so that an annular gap can be reduced after the male plug 502 is inserted. The lower section of the male plug 502 is provided with a reducing guide to guide the male plug 502 to be smoothly inserted into the female plug 501. A circular pin male ring plate 503 is arranged on the pin male 501, and rib plates are distributed between the pin male ring plate 503 and the circular pipe of the pin male 502. After the male plug 502 is in place in the female plug 501, the male plug ring plate 503 is erected at the upper end of the circular tube of the female plug 501, and the male plug ring plate 503 limits the insertion depth of the male plug 502 in the female plug 501 and transmits the vertical load transmitted by the male plug 502.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for installing a three-leg jacket with a jacket buoy device is realized based on the jacket buoy device, and is characterized in that the jacket buoy device comprises the following components:
the inner part of the floating barrel is provided with a cavity, and two ends of the floating barrel are provided with floating barrel end sealing plates for sealing the floating barrel;
one end of the upper connecting piece is arranged at the upper part of the buoy, and the other end of the upper connecting piece is connected with one end of a conduit frame leg of the conduit frame;
one end of the lower connecting piece is arranged at the lower part of the buoy, and the other end of the lower connecting piece is connected with the other end of the conduit frame leg of the conduit frame through a bolt component;
the installation method comprises the following steps:
respectively installing two buoys on vertical sections of two jacket legs of a three-leg jacket;
the three-leg jacket is lifted from the barge by a floating crane and is lowered into seawater, the jacket is freely overturned under the action of buoyancy, and a plane formed between two jacket legs for mounting the buoy is upward after overturning;
arranging a righting lockset and a righting lockset platform on the plane;
and after the bottom of the jacket is righted by using the righting lockset by using a floating crane ship, the two buoys are respectively detached from the two jacket legs to complete the installation of the three-leg jacket.
2. The method of installing a three-legged jacket with a float assembly of claim 1, wherein said latch assembly of said jacket float assembly includes a male plug and a female plug, said male plug being connected to said lower connector and said female plug being connected to the other end of said jacket legs.
3. The method of installing a three-legged jacket with a spar arrangement of claim 2, wherein the female plug of the jacket spar arrangement is connected to the jacket legs of the jacket by a connecting plate.
4. The method of installing a three-legged jacket with buoy device as claimed in claim 1, wherein the jacket buoy device is provided with buoy reinforcement rings at both ends of the buoy corresponding to the upper and lower connectors, respectively.
5. The method of installing a three-legged jacket with spar attachment of claim 1, wherein the jacket spar attachment is provided with a plurality of spar hydrostatic crush rings spaced along the length of the spar.
6. The method of installing a three-legged jacket with pontoon apparatus of claim 1, wherein the pontoon of the jacket pontoon apparatus is internally provided with a bulkhead for compartmentalizing an internal cavity.
7. The method of installing a three-legged jacket with float device of claim 1, wherein the lower end of the float of the jacket float device is provided with a water inlet valve.
8. The method of installing a three-legged jacket with buoy device as claimed in claim 1, wherein said hoisting and lowering the three-legged jacket from the barge into the sea by means of a floating crane comprises: the plane formed between one of the conduit frame legs to which the pontoon is mounted and the conduit frame leg to which the pontoon is not mounted is first placed in the sea water.
9. The method of installing a three-legged jacket with buoy device as claimed in claim 1, wherein said removing two buoys from two of said jacket legs, respectively, comprises: cutting off the part of the jacket leg connected with the upper connecting piece to separate the upper end of the buoy from the three-leg jacket; and pulling out the male plug of the plug from the female plug of the plug to separate the lower end of the buoy from the three-leg jacket.
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| CN202210331627.XA CN114620196B (en) | 2022-03-31 | 2022-03-31 | Jacket buoy device and three-leg jacket installation method with buoy device |
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| CN202210331627.XA CN114620196B (en) | 2022-03-31 | 2022-03-31 | Jacket buoy device and three-leg jacket installation method with buoy device |
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