KR20140119921A - Flexible Riser System and Method for Adjusting Length of Flexible Riser Using The Same - Google Patents

Flexible Riser System and Method for Adjusting Length of Flexible Riser Using The Same Download PDF

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Publication number
KR20140119921A
KR20140119921A KR1020130034394A KR20130034394A KR20140119921A KR 20140119921 A KR20140119921 A KR 20140119921A KR 1020130034394 A KR1020130034394 A KR 1020130034394A KR 20130034394 A KR20130034394 A KR 20130034394A KR 20140119921 A KR20140119921 A KR 20140119921A
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South Korea
Prior art keywords
riser
length
reel
take
main
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KR1020130034394A
Other languages
Korean (ko)
Inventor
강대훈
강효동
이광민
류민철
Original Assignee
대우조선해양 주식회사
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Priority to KR1020130034394A priority Critical patent/KR20140119921A/en
Publication of KR20140119921A publication Critical patent/KR20140119921A/en

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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
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • E21B19/004—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Earth Drilling (AREA)

Abstract

The present invention relates to a flexible riser system and a method for adjusting the length of a flexible riser using the same. Provided are a flexible riser system and a method for adjusting the length of a flexible riser using the same, which can properly control the length of a riser even in accord with the movements of a floating body position. Also, the invention can stably maintain the arranged state of the riser, by coupling the riser connected from the floating body to an upper end part of an oil well and an additional length adjustment unit in the middle part, and by controlling the length of the riser through the length adjustment unit, therefore easily adjusting the length and installment. Because the structure simply uses a winding reel type for the length adjustment unit, the structure can can adjust to a wide variety of arrangement shapes, overcoming the limitation of other inventions with a similar purpose.

Description

Technical Field [0001] The present invention relates to a flexible riser system,

The present invention relates to a flexible riser system and a flexible riser length adjustment method using the flexible riser system. More specifically, the riser connected from the floating hull to the upper end of the wellhead is connected to a separate length adjusting unit at the stop, and the length of the riser can be adjusted through the length adjusting unit, It is possible to adjust the length of the riser appropriately so that the arrangement state of the riser can be stably maintained and the length adjustment unit is configured as a take-up reel so that the structure is simple, The present invention also relates to a flexible riser system capable of overcoming the limitations of the configuration change of the riser by extending the length adjustment range of the riser to a wider range, and a flexible riser length adjustment method using the flexible riser system.

Floating crude oil storage facility (hereinafter referred to as "FPSO") or floating liquid storage gas storage facility (hereinafter referred to as "LNG FPSO") is a floating storage facility in the form of a ship or a barge. Of these, FPSO is currently being used to produce crude oil from oilfields, and LNG FPSO has been actively developed in recent years due to depletion of oilfields and increased demand for clean fuels.

FPSO or LNG FPSO is a floating marine refinery capable of refining, storing and transporting crude oil or natural gas while floating in the sea.

Such a floating storage facility is equipped with a riser to move oil, gas, etc. from the oil well at the bottom of the seabed to the storage facility. Typically, a riser is used to transport a crude oil product that is a mixture of oil, gas, and water from an oil well (or gas well) to a process plant on the hull, Means a tube that serves as a passageway for filling.

In this case, since the floating storage facility changes its position due to the influence of waves and algae, the riser is formed in a flexible form so as to cope with such a change in position. In particular, Since the motion is relatively large, the motion of the floating storage device can be absorbed in a wider range by using a separate buoyant body or the like so that the arrangement of the risers forms an "S "

1 is a schematic view schematically showing an installation structure of a conventional flexible riser system according to the prior art.

As shown in FIG. 1, the riser 30 is formed to have flexibility so as to connect the well head 21 of the wellhead with the floating hull 10. A conventional riser system according to the prior art is, for example, And a separate buoyant body 31 is coupled to an intermediate portion of the riser 30. By the buoyancy generated by the buoyant body 31, the riser 30 is arranged in an approximately "S " -jar curve shape, and through this arrangement it is possible to absorb the movement of the hull 10 in a relatively wider range have.

Also, although not shown, a system in which a buoyancy tank or the like is installed on the bottom of the sea bed so that the configuration of the riser 30 is continuously formed in an "S" curve shape is generally applied to the riser system.

More specifically, the floating hull 10 horizontally moves away from the TDP by a wave or an algae based on a point at which the riser 30 contacts the underside surface (or the well head) (Touch Down Point, TDP) To move closer. In this case, the ratio of the planar motion of the floating hull 10 to the depth of the water is very high in a shallow watery sea because the distance between the maximum distance and the maximum distance of the floating hull 10 on the basis of TDP Which means it is very large. In this case, the riser 30 must be long enough for the floating hull 10 to be farthest away from the TDP, and, conversely, fall into a design contradiction that must be short enough for near maximum reach. In order to overcome this contradictory situation, it is general to design the buoyancy body 31 or the like so as to correspond to the change in length, as described above.

However, in the region where the water depth is very low and the sea waves or the algae are high, the planar motion of the floating hull 10 is very large, and the design of the riser system is very difficult or impossible. That is, when the floating hull 10 is farthest from the TDP, the tension acting on the riser 30 is greater than the design standard. If the floating hull 10 approaches the TDP, the radius of curvature of the riser 30 is reduced There is a problem in that it is very difficult to provide a stable riser system at low water depths.

Prior art is Korean Utility Model Registration No. 20-448757.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art, and it is an object of the present invention to allow a riser connected from the floating hull to the top of the wellhead to be coupled to a separate length- So that the length of the riser can be appropriately adjusted in accordance with the movement of the floating hull and the stable state of the arrangement of the risers can be achieved.

Another object of the present invention is to provide a length adjusting unit capable of adjusting the length of the riser, which is configured as a take-up reel in which a riser can be wound, so that the structure is simple and easy to install, The present invention provides a flexible riser system capable of extending the range to a wider range, thereby overcoming the limitation of the arrangement configuration change for the riser.

The present invention relates to a flexible riser system used for marine oil field development, comprising: a length adjustment unit fixedly installed on a bottom of a seabed; And a flexible riser connected to the well end of the bottom of the seabed from the floating hull from the sea via the length adjusting unit, the riser having a length adjustable in the main arrangement section from the floating hull to the length adjusting unit, The flexible riser system is characterized in that the length is adjusted by the unit.

In this case, the length adjusting unit includes a take-up reel module in which an intermediate portion of the riser is partially wound, and the length of the riser in the main batch section is adjusted in such a manner as to adjust the amount of winding of the riser wound on the take- Can be adjusted.

The length adjusting unit may further include a main driving unit for rotationally driving the take-up reel module so that the amount of winding of the riser is adjusted.

In addition, the length adjusting unit can be operated and controlled by a separate control unit so that the winding amount of the riser can be adjusted according to the positional movement of the floating hull.

In addition, a position sensing sensor capable of sensing the position of the floating hull is provided, and the controller can control the operation of the length adjusting unit according to a value sensed by the position sensing sensor.

In addition, the length adjusting unit may be controlled by a separate controller so that the amount of winding of the riser is adjusted according to the tension applied to the riser in the main placement section.

In addition, a tension sensor capable of detecting the tension of the riser may be provided in the main placement section, and the controller may control the length control unit according to a value sensed by the tension sensor.

In addition, the length adjusting unit may be formed such that the length of the riser with respect to the sub-arrangement period from the length adjusting unit to the oil well upper end is constant in the process of adjusting the length of the riser with respect to the main batch section .

Further, a main take-up reel and a sub-take-up reel are disposed in the take-up reel module such that an intermediate portion of the riser is sequentially wound, the main take-up reel is rotatably mounted so as to be rotatable by the main drive, The length of the riser is adjusted in the main batch section by winding or unwinding the riser on the main take-up reel by rotation of the main take-up reel, and when the main take- The riser may be wound or unwound on the sub-take-up reel so that the length of the riser in the sub-section is kept constant.

Further, the take-up reel module may be provided with a take-up reel module in which the riser that is unwound from the main take-up reel when the main take-up reel is rotated in one direction is wound on the sub take-up reel, Up reel from the sub-take-up reel so that the take-up reel may be wound.

Meanwhile, the present invention provides a flexible riser length adjusting method, wherein the length of the riser is adjusted using the flexible riser system.

According to the present invention, the riser connected from the floating hull to the upper end of the oil well can be connected to the separate length adjusting unit at the intermediate portion, and the length of the riser can be adjusted through the length adjusting unit, The length of the riser can be appropriately adjusted correspondingly, and the arrangement state of the riser can be stably maintained.

In addition, by constituting the take-up reel in which the riser can be wound with respect to the length adjusting unit capable of adjusting the length of the riser, the structure is simple, the installation is simple, the length adjusting operation is convenient, So that it is possible to overcome the limitation of the arrangement shape change for the riser.

1 is a schematic view schematically showing an installation structure of a conventional flexible riser system according to the prior art,
FIG. 2 is a schematic view schematically showing an installation structure of a flexible riser system according to an embodiment of the present invention;
3 is an exemplary illustration of an operating state for a flexible riser system according to an embodiment of the present invention,
4 is a perspective view schematically showing a configuration of a length adjusting unit of a flexible riser system according to an embodiment of the present invention;
5 is an operational state diagram schematically illustrating an operation state of a length adjustment unit of a flexible riser system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 2 is a schematic view schematically showing an installation structure of a flexible riser system according to an embodiment of the present invention, and FIG. 3 is a view exemplarily showing an operation state of a flexible riser system according to an embodiment of the present invention. FIG. 4 is a perspective view schematically showing a configuration of a length adjusting unit of a flexible riser system according to an embodiment of the present invention, FIG. 5 is a perspective view of a length adjusting unit of a flexible riser system according to an embodiment of the present invention, Fig. 3 is an operating state diagram schematically showing the operating state of the battery pack.

The flexible riser system according to an embodiment of the present invention is used for marine oil field development. The flexible riser system includes a length adjustment unit 40 fixedly installed on the bottom of the sea floor, a length adjustment unit 40 from the floating floating hull 10, And a flexible riser 30 connected to the upper end of the well 20 at the bottom of the sea floor.

That is, the riser 30 is installed to connect the floating hull 10 and the well head 21 at the upper end of the oil well 20 in the form of one integral pipe having flexibility, As shown in FIG. At this time, the length adjusting unit 40 is fixed to the bottom of the seabed.

A section from the floating hull 10 to the length adjusting unit 40 is referred to as a main placing section P1 and a section from the length adjusting unit 40 to the upper end of the oil well 20 is referred to as a sub- (P2), the length of the riser (30) is adjusted by the length adjusting unit (40) in the main placement section (P1).

The length adjusting unit 40 includes a take-up reel module 100 in which an intermediate portion of the riser 30 is partially wound as shown in Fig. 4, and a riser 30 wound around the take-up reel module 100, The length of the riser 30 in the main placement section P1 is adjusted in such a manner that the winding amount of the riser 30 is adjusted. The length adjusting unit 40 further includes a main driving unit 200 for rotationally driving the take-up reel module 100 to adjust the amount of wind of the riser 30, A separate umbilical line 41 from the floating hull 10 to the length adjusting unit 40 can be provided.

According to this structure, even if the floating hull 10 horizontally moves, the riser 30 can be maintained in a stable state without exerting excessive tension or bending stress.

For example, as shown in FIG. 3 (a), the floating hull 10 is positioned such that the distance of the main placement section P1 is in the X state, and as shown in FIG. 3 (b) When the floating hull 10 is horizontally moved so that the distance of the placement section P1 increases to the X 'state, the riser according to the related art has a problem that excessive tension is generated. However, in the embodiment of the present invention The riser 30 according to the present invention can increase the length of the riser 30 in the main placement section P1 by the length adjusting unit 40 so that excessive tension is not generated in the riser 30, Can be maintained. That is, the main drive unit 200 of the length adjusting unit 40 rotates the take-up reel module 100 to reduce the amount of windup of the riser 30, that is, by unwinding the riser 30, The length of the riser 30 can be increased in the first step P1 so that the tension state of the riser 30 can be stably maintained.

The length of the riser 30 is reduced by the length adjusting unit 40 in a similar manner even if the floating hull 10 is moved horizontally so as to reduce the distance of the main placement section P1 The bending stress or the like does not occur in the riser 30, and an appropriate tension state can be stably maintained.

Since the distance between the upper end of the oil well 20 and the length adjusting unit 40 is kept constant in the subordinate section P2 by fixing the length adjusting unit 40 to the bottom of the sea bed, It is preferable that the length of the riser 30 in the sub-arrangement section P2 is always kept constant.

Next, the configuration of the length adjusting unit 40 will be described in more detail.

The length adjusting unit 40 includes a take-up reel module 100 and a main drive unit 200 for rotating the take-up reel module 100 as described above. The take-up reel module 100 may include a main take-up reel 110 and a sub-take-up reel 120 arranged such that an intermediate portion of the riser 30 is sequentially wound as shown in FIG. The reel 110 is rotatably mounted to be rotatable by the main driving unit 200, and the sub-take-up reel 120 is rotatably mounted.

The main take-up reel 110 and the sub-take-up reel 120 are mounted in a separate outer case 300. A separate suction file (not shown) is coupled to the lower end of the outer case 300, The outer case 300 can be fixedly installed on the bottom of the seabed. A main driving unit 200 for rotating the main take-up reel 110 is disposed in the outer case 300 and the umbilical line 41 is connected to the floating hull 10 To the outer case 300. In addition, a separate control unit 400 for controlling the operation of the main driving unit 200 may be mounted in the outer case 300.

When the main take-up reel 110 rotates according to this structure, the riser 30 is wound on the main take-up reel 110 or unwound according to the rotational direction of the main take-up reel 110. When the riser 30 of the main batch section P1 is wound on the main take-up reel 110, the length of the riser 30 is reduced in the main batch section P1 and the length of the riser 30 Is unwound from the main take-up reel 110, the length of the riser 30 in the main lay section P1 is increased.

When the main take-up reel 110 rotates in this manner, the riser 30 disposed in the sub-arrangement section P2 is also wound or unwound by the main take-up reel 110, and the length thereof is changed. When the length of the riser 30 is changed in the constantly maintained sub-arrangement section P2, excessive tension or bending stress may be generated in the riser 30. Therefore, even if the main take-up reel 110 rotates, It is preferable that the length of the riser 30 is kept constant in the region P2. To this end, a sub-take-up reel 120 is provided and the riser 30 is wound or unwound on the sub-take-up reel 120 when the main take-up reel 110 is rotated, Is maintained constant.

That is, at one end of the main take-up reel 110, the riser 30 is wound or unwound according to the rotation of the main take-up reel 110 to adjust the length of the riser 30 in the main placement section P1, At the same time, at the other end of the main take-up reel 110, the riser 30 is wound around the main take-up reel 110 and the sub-take-up reel 120 so that the length of the riser 30 in the sub- Is maintained constant.

At this time, a separate winding guide means 500 is provided to move the riser 30 between the main take-up reel 110 and the sub-take-up reel 120 and to wind them alternately. The winding guide means 500 is configured to wind the riser that is unwound from the main take-up reel 110 to the sub-take-up reel 120 when the main take-up reel 110 is rotated in one direction, And is configured to unwind the riser 30 from the sub-take-up reel 120 so that the riser 30 is wound on the main take-up reel 110.

A guide ring 510 formed to penetrate the riser 30 as shown in FIGS. 4 and 5 and a guide ring 510 for guiding the guide ring 510 to rotate along the outer periphery of the sub- A rotating shaft 520 of a bent shape connected to the ring 510 and a driving motor 530 for rotating the rotating shaft 520 in both directions. At this time, the driving motor 530 may be configured to move linearly in the direction of the rotating shaft 520 through another feeding means (not shown). The winding guide means 500 guides the riser 30 to the outer circumferential surface of the sub-take-up reel 120 while guiding the riser 30 through the guide ring 510, As shown in Fig.

Referring to FIG. 5, the operation of the length regulating unit 40 having such a structure will be described in more detail with reference to FIG. 5. For example, as shown in FIG. 5A, The riser 30 is retracted from the main take-up reel 110 to the main placement section P1 so that the main placement section P1 is wound around the main placement section P1, The length of the riser 30 increases. At the same time, on the other side of the main take-up reel 110, the riser 30 must be wound on the main take-up reel 110. This causes the riser 30 wound on the sub- Is released. That is, the riser 30 can be wound on the main take-up reel 110 without interfering with operation in the winding process by winding the riser 30 from the sub-take-up reel 120 by the coiling guide means 500. With this operating structure, the length of the riser 30 in the sub-arrangement section P2 can always be kept constant.

5 (b), when the main take-up reel 110 is rotated in the clockwise direction through the main drive unit 200, on one side of the main take-up reel 110, Up reel 110 from the main platen P1 to thereby reduce the length of the riser 30 in the main platen section P1. The riser 30 is retracted from the main take-up reel 110 and the reel 30 is retracted from the other side of the main take-up reel 110 by the take-up guide means 500, . Similarly, the length of the riser 30 in the sub-arrangement section P2 can be kept constant without changing by this operating structure.

The length adjuster 40 may be controlled by a separate controller 400 as described above. For example, the length adjuster 40 may be controlled by a separate control unit 400, for example, The main drive unit 200 may be controlled so that the winding amount of the main drive unit 200 is controlled. At this time, the floating hull 10 may be provided with a position detection sensor 410 for detecting the position of the floating hull 10, and the control unit 400 may detect the position of the floating hull 10 detected by the position detection sensor 410 May be configured to control the operation of the main driver 200 according to the value. The position sensing sensor 410 may be applied in various forms such as a GPS sensor.

The length adjusting unit 40 may be controlled by the controller 400 to adjust the amount of the winding of the riser 30 according to the tension applied to the riser 30 in the main arrangement section P1. A tension sensor 420 capable of detecting tension on the riser 30 is mounted on the riser 30 in the main placement section P1 and the controller 400 controls the tension of the riser 30, The operation of the main driving unit 200 may be controlled according to the control signal. The tension sensor 420 may be applied in various forms such as a strain gage.

A torque sensor 430 may be mounted on the main take-up reel 110 and the control unit 400 may be configured to control the operation of the main drive unit 200 according to a value sensed by the torque sensor 430 It can be controlled in various ways through various sensors.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Floating hull 20: Oil well
21: well head 30: riser
40: length adjusting unit 41: umbilical line
100: take-up reel module 110: main take-up reel
120: sub-take-up reel 200: main drive unit
300: outer case 400:
410: position sensor 420: tension sensor
430: torque sensor 500: winding guide means
510: guide ring 520: rotating shaft
530: drive motor P1: main arrangement section
P2: Sub-layout section

Claims (11)

In a flexible riser system used for offshore field development,
A length adjusting unit fixedly installed on the bottom of the seabed; And
A flexible riser connected to the top of the bottom of the seabed from the floating floating hull via the length control unit;
Wherein the riser is length-adjustable by the length adjusting unit in a main positioning section from the floating hull to the length adjusting unit. The method according to claim 1,
The length adjustment unit
Wherein a length of the riser is adjusted in a manner that adjusts the amount of winding of the riser wound on the take-up reel module, the take-up reel module including a take- Riser system. 3. The method of claim 2,
The length adjustment unit
Further comprising a main drive unit for rotating the take-up reel module so that the amount of wind of the riser is adjusted. The method of claim 3,
Wherein the length regulating unit is controlled by a separate control unit so that the amount of winding of the riser is adjusted in accordance with the positional movement of the floating hull. 5. The method of claim 4,
And a control unit for controlling the operation of the length adjusting unit according to a value detected by the position detecting sensor. The flexible riser system according to claim 1, wherein the position detecting sensor detects the position of the floating hull. The method of claim 3,
Wherein the length regulating unit is controlled by a separate control unit so that the amount of winding of the riser is adjusted according to the tension acting on the riser in the main placement interval. The method according to claim 6,
Wherein the control unit controls operation of the length adjusting unit according to a value sensed by the tension detecting sensor, wherein the control unit controls operation of the length adjusting unit, system. The method of claim 3,
The length adjustment unit
Wherein the length of the riser with respect to the sub-arrangement period from the length adjusting unit to the top of the well is maintained to be constant in the process of adjusting the length of the riser with respect to the main batch section. 9. The method of claim 8,
Wherein the main take-up reel is rotatably mounted to be rotatable by the main drive unit, and the sub-take-up reel is rotatably mounted on the main take- Fixedly mounted,
The length of the riser is adjusted in the main placement section by winding or unwinding the riser on the main take-up reel by rotation of the main take-up reel, and when the reel is rotated on the main take- Or unrolled, so that the length of the riser is kept constant in the sub-section. 10. The method of claim 9,
The take-up reel module
Up reel from the main take-up reel when the main take-up reel is unidirectionally rotated on the sub-take-up reel, and when the main take-up reel rotates in the other direction, the riser is wound on the main take- And a winding guide means for unwinding the riser from the winding guide means. A method of adjusting the length of a flexible riser using the flexible riser system of any one of claims 1 to 10.
KR1020130034394A 2013-03-29 2013-03-29 Flexible Riser System and Method for Adjusting Length of Flexible Riser Using The Same KR20140119921A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101696156B1 (en) * 2016-07-27 2017-01-12 김정현 Flexible riser system
KR102065548B1 (en) * 2018-11-15 2020-01-13 주식회사 포어시스 Mooring device for floating structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101696156B1 (en) * 2016-07-27 2017-01-12 김정현 Flexible riser system
KR102065548B1 (en) * 2018-11-15 2020-01-13 주식회사 포어시스 Mooring device for floating structure

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