WO2014003939A1 - Floating offshore platform and centralized open keel plate - Google Patents
Floating offshore platform and centralized open keel plate Download PDFInfo
- Publication number
- WO2014003939A1 WO2014003939A1 PCT/US2013/042755 US2013042755W WO2014003939A1 WO 2014003939 A1 WO2014003939 A1 WO 2014003939A1 US 2013042755 W US2013042755 W US 2013042755W WO 2014003939 A1 WO2014003939 A1 WO 2014003939A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- offshore platform
- keel plate
- platform
- water
- hull
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
- B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
- B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
- B63B1/125—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising more than two hulls
- B63B2001/126—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising more than two hulls comprising more than three hulls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
- B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
- B63B2001/128—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising underwater connectors between the hulls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
- B63B2039/067—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water effecting motion dampening by means of fixed or movable resistance bodies, e.g. by bilge keels
Definitions
- the disclosure relates a method and a system for reducing the vertical motions on floating platforms for drilling and production. More particularly, the present disclosure relates to floating platforms used in the exploration and production of offshore oil and gas, and more particularly to a semisubmersible floating platform having a keel plate to function as a heave plate.
- a type of platform is known as a semi-submersible platform.
- the structure is built near shore or onshore, floated to the offshore site, and partially submerged using ballast tanks to provide stability to the structure.
- Semi-submersibles are typically configured with large buoyant pontoon structures below the water surface and slender columns passing through the water surface supporting a topsides deck at a significant height above the water surface.
- Semi-submersible platforms make large and cost effective platforms for drilling and production of offshore oil and gas.
- the structure has a relatively large floating surface, one challenge is restricting movement caused by wave and wind action to provide a desired stability for operations.
- Heave plates have been used to stabilize movement of the semi-submersible platforms.
- the heave plate can be a solid plate or a constructed assembly of a plurality of plates that form a box to form a relatively large horizontal surface area, but is relatively thin vertically.
- the heave plate is mounted to the semi-submersible platform below the water surface and below at least a portion of the wave-influenced water zones.
- the heave plate increases the hydrodynamic mass of the offshore platform, where hydrodynamic mass is a measure of the amount of a fluid moving with a body that accelerates in the fluid and depends on the shape of the body and the direction of its motion.
- the heave plate at the lower depths provides additional resistance to vertical and tilting motion that would otherwise occur near or at the water surface.
- U.S. Pat. No. 6,652,192 discloses a heave suppressed, floating offshore drilling and production platform having vertical columns, lateral trusses connecting adjacent columns, a deep-submerged horizontal plate supported from the bottom of the columns by vertical truss legs, and a topside deck supported by the columns.
- the lateral trusses connect adjacent columns near their lower end to enhance the structural integrity of the platform.
- the truss legs are stowed in shafts within each column, and the plate is carried just below the lower ends of the columns.
- the truss legs are lowered from the column shafts to lower the plate to a deep draft for reducing the effect of wave forces and to provide heave and vertical motion resistance to the platform. Water in the column shafts is then removed for buoyantly lifting the platform so that the deck is at the desired elevation above the water surface.
- US Pat. No. 7,219,615 discloses a semi-submersible vessel having a pair of vertically spaced pontoons with varied buoyancy.
- the lower pontoon is retained in a close vertical proximity to the upper pontoon when the vessel is in transit.
- the lower pontoon is ballasted at the deployment site, dropping the pontoon to a depth of about 32 meters below the first pontoon baseline. As a result, stability and motion characteristics of the vessel are significantly improved.
- a deep draft semisubmersible usually needs to have larger than a 60 m draft to have the favorable motion to support the connections to the sea floor in harsh sea states.
- the topside integration at the quayside and the transition from the fabrication yard to the installation site become problematic, because the column is too high to stabilize the platform during the transition mode.
- Many designs solve this difficulty by extending the draft that requires the significant risk of offshore installation operation.
- the disclosure provides improved performance and reduces vertical movement of a floating offshore platform by including a centralized open keel plate coupled to the hull that allows water below and above the keel plate.
- the keel plate separates the water and causes drag on the platform.
- the water moving vertically with the plate also increases the dynamic mass.
- the drag results in less vertical movement of the offshore platform without the need to extend legs of the platform to gain an equivalent reduction in vertical movement.
- the added dynamic mass increases the natural period of the vertical motion away from the wave excitation period to minimize the wave driven motion.
- the vertical motion of the platform can be reduced compared to a platform without the keel plate.
- the keel plate can be coupled to the hull during fabrication at the yard.
- the keel plate generally is above or at the same level of the keel, and therefore would not reduce the clearance between the seabed and the keel of the hull at the quayside. Therefore, the keel plate can provide enough stability and buoyancy for quayside integration and for the transition from the fabrication yard to the installation site.
- the disclosure provides a floating offshore platform, comprising: a floating hull comprising: a plurality of vertically extending columns; a plurality of pontoons coupled to the vertically extending columns that are configured to be disposed at least partially below a surface of water in which the offshore platform is disposed; and further comprising a keel plate disposed in a central open area of the hull, the keel plate being configured to be disposed at least partially below a surface of water in which the offshore platform is disposed, and having a gap between at least a portion of an outer perimeter of the keel plate and an inner perimeter of the hull.
- the disclosure also provides a method of stabilizing a floating offshore platform, the offshore platform having a floating hull comprising a plurality of vertically extending columns and a plurality of pontoons coupled to the vertically extending columns that are configured to be disposed at least partially below a surface of water in which the offshore platform is disposed; and a keel plate disposed in a central open area of the hull below a surface of water and having a gap between at least a portion of an outer perimeter of the keel plate and an inner perimeter of the hull, the method comprising: allowing the offshore platform to float in water; and allowing water to flow through the gap between the outer perimeter of the keel plate and the inner perimeter of the hull to cause water separation around the outer perimeter of the keel plate upon the offshore platform moving vertically in response to a sea wave.
- Figure 1 is a schematic perspective view of an exemplary embodiment of a floating offshore platform having a keel plate.
- Figure 2 is a schematic side view of the exemplary floating offshore platform with the keel plate.
- Figure 3 is a schematic perspective cross sectional view of the floating offshore platform with the keel plate disposed in an open area between the pontoons, columns, or a combination thereof.
- Figure 4 is a schematic top cross sectional view of the floating platform with the keel plate.
- Figure 5 is a schematic side cross sectional view of the floating platform with the keel plate.
- Figure 6 is a chart of predicted effects of the keel plate on the offshore platform based on a typical design wave period, comparing a stabilized offshore platform with an unstabilized offshore platform.
- the disclosure provides improved performance and reduces vertical movement of a floating offshore platform by including a centralized open keel plate coupled to the hull that allows water below and above the keel plate.
- the keel plate separates the water and causes drag on the platform.
- the water moving vertically with the plate also increases the dynamic mass.
- the drag results in less vertical movement of the offshore platform without the need to extend legs of the platform to gain an equivalent reduction in vertical movement.
- the added dynamic mass increases the natural period of the vertical motion away from the wave excitation period to minimize the wave driven motion.
- the vertical motion of the platform can be reduced compared to a platform without the keel plate.
- the keel plate can be coupled to the hull during fabrication at the yard.
- the keel plate generally is above or at the same level of the keel, and therefore would not reduce the clearance between the seabed and the keel of the hull at the quayside. Therefore, the keel plate can provide enough stability and buoyancy for quayside integration and for the transition from the fabrication yard to the installation site.
- Figure 1 is a schematic perspective view of an exemplary embodiment of a floating offshore platform having a keel plate.
- Figure 2 is a schematic side view of the exemplary floating offshore platform with the keel plate.
- Figure 3 is a schematic perspective cross sectional view of the floating offshore platform with the keel plate disposed in an open area between the pontoons, columns, or a combination thereof.
- Figure 4 is a schematic top cross sectional view of the floating platform with the keel plate.
- Figure 5 is a schematic side cross sectional view of the floating platform with the keel plate. The figures will be described in conjunction with each other.
- An exemplary floating offshore platform 2 generally includes a topsides 4 (also referenced a deck) that supports equipment, facilities, and operations for the offshore platform.
- the topsides 4 is coupled to a plurality of columns 6, generally at least three and often four columns.
- the columns 6 have a column height H c with a portion that is below a water level 16 to establish a draft height H D .
- the columns can be at least partially buoyant and can be adjustable in their buoyancy.
- the columns 6 can be coupled to pontoons 8 disposed between two of more of the columns or below the columns where the pontoons would join and become a pontoon base.
- the columns 6 and pontoons 8 can be referenced herein as a hull 20.
- An open area 22 having a width W is created between the columns and the pontoons that is central to the offshore platform.
- the width W would be the shortest cross sectional dimension across the shape.
- the W would be the shortest cross sectional dimension of the shape, that is, the length measured along a perpendicular line from a side to an apex across the shape.
- the width W would be the diameter.
- the width would be the shorter minor axis.
- the open area 22 is generally used to position risers to the seafloor (not shown) and other subsurface members.
- the disclosure provides a keel plate 10 in the open area 22.
- the keel plate 10 is generally a plate as the term is normally used in the field, that is, having a large square area compared to a small thickness and is generally a non-buoyant structure.
- the keel plate 10 is generally oriented horizontally and located at the keel level inside the open area 22 of the hull 20. In at least one embodiment, the keel plate 10 can be centered in the open area 22.
- the keel plate 10 generally has one or more openings 30 through which risers and other subsurface connections can be made and are disposed generally toward the middle of the keel plate.
- the keel plate is shown as a square, but can have other geometric shapes as may be appropriate for the offshore platform, including triangular, rectangular, circular, elliptical, hexagonal, octagonal, and so forth.
- the keel plate 10 can be supported by a horizontal frame 12 with lateral braces 14 extending from the keel plate to the hull 20, such as to the columns 6 or pontoons 8.
- the lateral braces 14 can be positioned around the keel plate 10, including at one or more corners of the keel plate.
- the keel plate 10 can also be supported by vertical braces 18, shown in Figure 5.
- the horizontal frame 12 is below the keel plate 10, and the vertical braces 18 are disposed above the keel plate.
- one end of the vertical braces 18 can be coupled to the horizontal frame 12 and the other end of the vertical braces to a top of a side of the pontoons 8 to maximize an angle between the horizontal frame and the vertical braces.
- the keel plate 10 and the frame 12 are coupled at or above the bottom 24 of the hull 20 of the offshore platform 2.
- the keel plate 10 can be installed during the fabrication process of the offshore platform at the fabrication yard.
- the keel plate and the frame do not decrease a bottom clearance during the wet tow or quayside integration of the topside 4.
- the keel plate 10 is sized within the open area 22 to leave a gap G between an outer perimeter 26 of the keel plate and an inner perimeter 28 of the hull 20, namely, the inner perimeter formed by the pontoons, or pontoons and columns, depending on the specific structure of the offshore platform.
- the gap G can be at least 10% of the width W of the open area 22. In at least one embodiment, the gap G can be equal around the keel plate 10. However, in some embodiments, it may be that unequal gaps could be designed to effect a different result for various sides of the hull, that is, gaps G-i , G 2 , G 3 , and G 4 illustrated in Figure 4 could be equal or unequal.
- the keel plate helps add dynamic mass from the water volume moving with the keel plate and thence to the platform during vertical movement of the platform.
- the gap G between the keel plate 10 and the hull 20 creates water separation around the edges of the keel plate, that is, the outer perimeter 26.
- the water separation dissipates the energy to generate drag during the platform movement.
- the added mass and the drag help reduce the wave-induced motion of the platform, such as in hurricanes in the Gulf of Mexico and other harsh sea states.
- the addition of the keel plate provides a better heave motion by increasing the natural period of a heave motion larger than the conventional deep draft semisubmersibles, as shown in Figure 6.
- the size of the gap G and the opening 30 help tune the phase of the wave loads on the plate 10 and on the hull 20 to reduce the total wave loads at a critical wave period when the wave energy is maximum.
- too small a gap can decrease the volume of water being separated and result in reduced effectiveness of the keel plate, but too small of a keel plate reduces the surface area available for water separation and can result in reduced effectively of the keel plate.
- the particular size and configurations can be modeled and/or experimentally determined by those with ordinary skill in the art, given the teachings and guidance provided herein.
- Figure 6 is a chart of predicted effects of the keel plate on an exemplary floating offshore platform based on a typical design wave period, comparing a stabilized offshore platform with an unstabilized offshore platform.
- the X-axis is the time in seconds of a wave period and the natural period of the offshore platform 2 without the keel plate 10 and with the keel plate.
- the Y-axis represents the response amplitude operator (RAO), a known term of art in vessel design for responding to the movement of the vessel in proportion to a wave height.
- REO response amplitude operator
- the curve 32 represents the wave energy spectrum having a peak period of T P of 15 seconds.
- the curve 34 represents the responsive natural period of an unstabilized floating offshore platform without a keel plate 10, where the natural period is 21.5 seconds at a 1.40 FxAO.
- the curve 34 represents the responsive natural period of a stabilized floating offshore platform with a keel plate 10, where the natural period is 25.0 seconds at a 1 .42 RAO.
- the keel plate modeling predicts an increase of the natural period of the offshore platform (and therefore decrease in response to a sea wave) with the keel plate by about 16% more than the offshore platform without the keel plate.
- the keel plate lengthens the offshore platform period and the resonance of such period, so that the offshore platform is more stabilized and its movement is dampened at the design period.
- the offshore platform movement does not move in direct correlation to the wave passing by the offshore platform.
- Figure 6 also indicates that a hump of the RAO around a 15-17 seconds wave period can be kept similar to the unstabiliized platform without the keel plate by tuning the sizes of the gap G and the center opening 30.
- the device or system may be used in a number of directions and orientations.
- the term “coupled,” “coupling,” “coupler,” and like terms are used broadly herein and may include any method or device for securing, binding, bonding, fastening, attaching, joining, inserting therein, forming thereon or therein, communicating, or otherwise associating, for example, mechanically, magnetically, electrically, chemically, operably, directly or indirectly with intermediate elements, one or more pieces of members together and may further include without limitation integrally forming one functional member with another in a unitary fashion.
- the coupling may occur in any direction, including rotationally.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Bridges Or Land Bridges (AREA)
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Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201380034496.8A CN104411577B (en) | 2012-06-27 | 2013-05-24 | Floating offshore platform and middle opening keel plate |
MX2014015097A MX354813B (en) | 2012-06-27 | 2013-05-24 | Floating offshore platform and centralized open keel plate. |
EP13730392.1A EP2867112B1 (en) | 2012-06-27 | 2013-05-24 | Floating offshore platform and centralized open keel plate |
MYPI2014003439A MY173837A (en) | 2012-06-27 | 2013-05-24 | Floating offshore platform and centralized open keel plate |
CA2877104A CA2877104C (en) | 2012-06-27 | 2013-05-24 | Floating offshore platform and centralized open keel plate |
BR112014031667-8A BR112014031667B1 (en) | 2012-06-27 | 2013-05-24 | FLOATING OFFSHORE PLATFORM, AND METHOD OF STABILIZING A FLOATING OFFSHORE PLATFORM |
AU2013281122A AU2013281122B2 (en) | 2012-06-27 | 2013-05-24 | Floating offshore platform and centralized open keel plate |
RU2015102344/11A RU2603172C2 (en) | 2012-06-27 | 2013-05-24 | Floating offshore platform and centralised open keel plate |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/534,457 US8967068B2 (en) | 2012-06-27 | 2012-06-27 | Floating offshore platform and centralized open keel plate |
US13/534,457 | 2012-06-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014003939A1 true WO2014003939A1 (en) | 2014-01-03 |
Family
ID=48670061
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2013/042755 WO2014003939A1 (en) | 2012-06-27 | 2013-05-24 | Floating offshore platform and centralized open keel plate |
Country Status (10)
Country | Link |
---|---|
US (1) | US8967068B2 (en) |
EP (1) | EP2867112B1 (en) |
CN (1) | CN104411577B (en) |
AU (1) | AU2013281122B2 (en) |
BR (1) | BR112014031667B1 (en) |
CA (1) | CA2877104C (en) |
MX (1) | MX354813B (en) |
MY (1) | MY173837A (en) |
RU (1) | RU2603172C2 (en) |
WO (1) | WO2014003939A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9302747B2 (en) * | 2013-04-10 | 2016-04-05 | Technip France | Floating offshore platform with pontoon-coupled extension plates for reduced heave motion |
US10097131B2 (en) * | 2014-08-26 | 2018-10-09 | Arizona Board Of Regents On Behalf Of The University Of Arizona | Smart floating platforms |
KR101601025B1 (en) * | 2014-12-01 | 2016-03-21 | 한국해양과학기술원 | Motion attenuating platform for offshore structures and marine semi-submersible structures equipped with it |
WO2016087709A1 (en) * | 2014-12-05 | 2016-06-09 | Beddit Oy | Sleep measurement computer system |
CN110087987B (en) * | 2016-11-09 | 2021-09-17 | 霍顿巴西技术海外有限公司 | Floating offshore structure with circular pontoons |
FR3067047B1 (en) * | 2017-06-06 | 2019-07-26 | Ideol | METHOD FOR LAUNCHING |
ES1284230Y (en) | 2021-11-03 | 2022-03-14 | Loureiro Benimeli Fermin Jaime | Multifunction piece, attachable to mobile phones, equipped with glasses, writing tool and folding support |
CN115771593B (en) * | 2022-11-30 | 2024-02-09 | 深海技术科学太湖实验室 | Bottom-supported platform for guaranteeing offshore unmanned island reef and installation method thereof |
CN116519261B (en) * | 2023-04-25 | 2023-10-20 | 大连理工大学 | Floating type offshore platform free decay test device, method and application |
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2012
- 2012-06-27 US US13/534,457 patent/US8967068B2/en active Active
-
2013
- 2013-05-24 EP EP13730392.1A patent/EP2867112B1/en active Active
- 2013-05-24 CA CA2877104A patent/CA2877104C/en active Active
- 2013-05-24 BR BR112014031667-8A patent/BR112014031667B1/en active IP Right Grant
- 2013-05-24 AU AU2013281122A patent/AU2013281122B2/en active Active
- 2013-05-24 MY MYPI2014003439A patent/MY173837A/en unknown
- 2013-05-24 MX MX2014015097A patent/MX354813B/en active IP Right Grant
- 2013-05-24 CN CN201380034496.8A patent/CN104411577B/en not_active Expired - Fee Related
- 2013-05-24 RU RU2015102344/11A patent/RU2603172C2/en active
- 2013-05-24 WO PCT/US2013/042755 patent/WO2014003939A1/en active Application Filing
Patent Citations (3)
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US20080115714A1 (en) * | 2006-11-21 | 2008-05-22 | Arcandra Tahar | Modular integrated semisubmersible |
US20090205554A1 (en) * | 2008-02-19 | 2009-08-20 | Nagan Srinivasan | Dry tree semi-submersible platform for harsh environment and ultra deepwater applications |
US20120034034A1 (en) * | 2010-08-03 | 2012-02-09 | Technip France | Truss heave plate system for offshore platform |
Also Published As
Publication number | Publication date |
---|---|
MX354813B (en) | 2018-03-22 |
US20140000502A1 (en) | 2014-01-02 |
BR112014031667A2 (en) | 2017-08-01 |
CA2877104C (en) | 2017-03-07 |
RU2015102344A (en) | 2016-08-20 |
EP2867112A1 (en) | 2015-05-06 |
CA2877104A1 (en) | 2014-01-03 |
MX2014015097A (en) | 2015-03-05 |
US8967068B2 (en) | 2015-03-03 |
BR112014031667B1 (en) | 2022-08-23 |
EP2867112B1 (en) | 2017-03-29 |
CN104411577B (en) | 2017-05-31 |
MY173837A (en) | 2020-02-24 |
AU2013281122A1 (en) | 2015-01-22 |
RU2603172C2 (en) | 2016-11-20 |
CN104411577A (en) | 2015-03-11 |
AU2013281122B2 (en) | 2017-01-12 |
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