EP0840690A1 - Offshore oil rig - Google Patents
Offshore oil rigInfo
- Publication number
- EP0840690A1 EP0840690A1 EP96926441A EP96926441A EP0840690A1 EP 0840690 A1 EP0840690 A1 EP 0840690A1 EP 96926441 A EP96926441 A EP 96926441A EP 96926441 A EP96926441 A EP 96926441A EP 0840690 A1 EP0840690 A1 EP 0840690A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- platform according
- platform
- legs
- submerged
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- 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
- 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
- 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 present invention relates to an offshore exploitation platform, in particular an offshore oil exploitation platform, of the type comprising an upper hull extending above sea level and connected to a base. hollow bottom totally immersed by partially immersed connecting legs forming buoyancy box and extending substantially vertically.
- Platforms of this type are known as semi-submersible platforms.
- the lower base is ballasted, for example by filling it with sea water.
- the legs are formed by cylindrical columns with solid walls delimiting over their entire height an enclosed space forming a buoyancy box for the platform.
- French patent application FR-A-2 713 588 describes a self-elevating platform comprising legs formed over the entire height of a metal trellis- lique. Integrated floats on the legs allow the platform to float. However, they are not intended to provide a reduction in the vertical movements of the platform.
- the object of the present invention is to propose an operating platform at sea which is not very sensitive to swell and whose length of the legs connecting the upper hull to the lower base is limited.
- the subject of the invention is an offshore exploitation platform, in particular an offshore petroleum exploitation platform, of the aforementioned type, characterized in that the legs have on their immersed height at least two successive sections, a first section with solid walls delimiting an enclosed space and forming a buoyancy box and a second section with perforated side wall, the interior space of this second section being open to the surrounding marine environment.
- the invention may have one or more of the following characteristics:
- the second section with perforated side wall is a metallic lattice structure
- the second section with perforated side wall is disposed between the first section with solid walls and the base
- the first section with full walls extends at least partially immediately below said shell, -
- the first and second sections are dimensioned so that the pressure force exerted on the first section with full walls compensates appreciably over a range of usual swell periods the acceleration force of the platform, the first and second sections are dimensioned so that the pressure force and the acceleration force are equal for two values of swell period included in the range of usual swell periods,
- the submerged height of the second section is between a quarter and three quarcs of the total submerged height of the leg
- the submerged height of the second section is between substantially 0.4 and substantially 0.65 times the total submerged height of the leg, the legs have a generally cylindrical outer shape,
- the base comprises at least one passage crossing it substantially vertically right through,
- ballast-forming fluid in particular sea water
- the hull is mounted movable along the legs and there are provided mechanisms for relative displacement and locking of the hull relative to the legs, - said second section with perforated side wall is disposed between two sections with solid walls according to the submerged height legs.
- FIG. 1 is a schematic elevational view of an oil platform according to the invention
- - Figure 2 is a graph showing the transfer function of a platform of the state of the art as a function of the swell period
- Figure 3 is a graph showing the evolution of the pressure and acceleration forces exerted on a platform of the prior art as a function of the swell period
- Figures 4 and 5 are graphs analogous to those of Figures 2 and 3 for a platform according to the invention.
- FIG. 1 there is shown schematically a self-elevating oil platform of the semi-submersible type. It essentially comprises an upper hull 1 extending over the sea when the platform is in operation, and connected by legs 2 to a submerged lower base 3.
- the upper shell comprises technical and residential buildings which are not shown, as well as a wellbore and well heads 4.
- passages 5 are provided through the hull 1 to allow the passage of the legs 2.
- Lifting mechanisms 6 are arranged around the passages 5 and make it possible to lower the legs 2 and the base 3 and hoist the hull 1 above the surface of the water up to an altitude which puts it out of reach of the highest waves.
- the mechanisms 6 are for example pinion and rack mechanisms, the racks extending over the entire height of the legs 2.
- These mechanisms 6 also include means for locking the legs 2 relative to the shell 1 in order to ensure a rigid leg connection on the hull.
- the legs 3 2 are for example four in number and have a generally cylindrical external shape. In the embodiment shown in Figure 1, they have a square section, but they can also have a circular or triangular section.
- the legs 2 are all identical and have, according to their submerged height, two successive sections.
- a first upper section 10 is formed by a tube with a solid wall closed at its lower end by a bottom 12. This first section thus delimits an enclosed space isolated from the surrounding marine environment and forms a buoyancy box for the platform.
- the upper part of this first section extends above sea level on either side of the hull 1.
- the lower part thereof extends immediately below the hull 1 and is partially submerged.
- the first section is extended by a second section 14 with perforated side wall, the interior of this second section being open to the surrounding marine environment.
- This second section is thus interposed between the first section 10 and the base 3 and is formed for example by a metallic lattice structure.
- This structure comprises four metal uprights 16 interconnected by a trellis 18 of metal tubes.
- the second section is welded at its upper end to the lower end of the section 10 and at its lower end to the base 3.
- the submerged height Zt of the first section 10 with a solid wall represents substantially a third of the total submerged height Zm of the legs 2.
- the second lattice section is completely submerged and extends in the embodiment shown over substantially two-thirds of the total submerged height of the legs 2.
- the submerged height of the second section with perforated side wall is between a quarter and three quarters of the total submerged height of the legs 2.
- the calculations show that the submerged height of the second section is generally between substantially 0.4 and substantially 0.65 times the total submerged height of the legs.
- the base 3 is hollow and is generally square, rectangular or triangular. It is filled with seawater and thus forms a ballast for the entire platform. It can also include tanks incorporated inside it in which hydrocarbons are stored. Furthermore, a central passage 20 passes right through the base 3. This passage reduces the resistant surface offered to the water during the vertical movements of the platform. It can also allow the circulation of drilling tools.
- the platform floats thanks to the submerged part of the first sections 10 with a solid wall. These sections are subjected to a pressure force denoted F p exerted on their bottom 12. The pressure force F p depends on the submerged height Zt of the first section 10.
- a ⁇ j is the area of the flotation surface, i.e. the area of the bottoms 12, ⁇ is the wave number of the swell and f (t) is the rise in the level of the free sea surface as a function of time.
- F acceleration force due principa ⁇ LEMENT the water movements and in particular their effect on the base 3.
- the added mass is a fictitious mass taking into account the action of the sea water surrounding the base on the platform during the movements of the latter.
- the two forces F a and F p applied to the platform are in phase opposition. Under these conditions, it is understandable that it is possible to size the first and second sections so that the submerged height Zt of the section 10 is such that the pressure force F p exerted on this first section substantially compensates over a range of periods. usual swell the acceleration force F a of the platform. In addition, the dimensioning can be such that these two forces are equal for two values of swell period included in the range of usual swell periods.
- the flotation surface that is to say the area of intersection of the legs with the surface of the water, as well as the base.
- the submerged height Zt of the first solid wall section is determined by solving the equation reflecting the equality of the forces F a and F p applied on the platform.
- a computer simulation of the behavior of the platform it is then verified that the two values of swell period, for which the forces F a and F p are equal, are included in a usual swell period range.
- the smallest value of swell period for the- which the two forces are equal is greater than 4 seconds.
- FIG. 2 is shown the transfer function of a platform of the prior art, that is to say with legs formed of a single solid wall section extending from the base 3 to hull 1, depending on the swell period T expressed in seconds.
- the transfer function in heaving is the ratio between the amplitude of the heaving movement of the platform and the amplitude of a swell of one meter, the heaving being a quantity representative of the upward and downward vertical movements platform under the effect of the swell.
- FIG. 3 shows the evolution of the pressure force F p and the evolution of the acceleration force F a as a function of the swell period T expressed in seconds for a platform of the state of technology.
- the amplitudes of the forces F a and F p for a period considered to be less than 28 seconds are very large.
- differences between the values of the forces F a and F p are large.
- the platform is subjected mainly to the acceleration force F a , from which results the significant heaving translated on the curve of FIG. 2.
- the values of F a and F p are substantially equal, which corresponds to a substantially zero heaving in this figure.
- the transfer function is represented in FIG. 4 while the forces F a and F p are represented in FIG. 5.
- the curve is canceled for two different periods T (15.5 seconds and 23.5 seconds) and not only a value as in the case of known platforms. These two cancellation values result from the two points of intersection of the curves representative of the forces of acceleration F a and pressure F p .
- the curves shown here were obtained with a platform whose submerged height Zt of the first section 10 with solid walls is equal to 50 m and whose total submerged length Zm of the legs is equal to 140 m.
- the volume of the base is equal to 33,000 m 3
- the area of the flotation surface (sum of the areas of the bottoms 12) is equal to 841 m 2 .
- the added mass of the platform is equal to 194,750 tonnes.
- the lattice sections 14 are arranged between two sections with solid walls according to the immersed height of the legs. Furthermore, any other arrangement of successive sections, some of which have solid walls and others with perforated side walls, is also possible for producing the legs of the platform.
- the good stability of the platform allows the installation of well heads on the hull.
Landscapes
- Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Earth Drilling (AREA)
- Revetment (AREA)
- Lubricants (AREA)
- Cleaning Or Clearing Of The Surface Of Open Water (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9509112 | 1995-07-26 | ||
FR9509112A FR2737179B1 (en) | 1995-07-26 | 1995-07-26 | OIL SEA EXPLOITATION PLATFORM |
PCT/FR1996/001151 WO1997005011A1 (en) | 1995-07-26 | 1996-07-22 | Offshore oil rig |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0840690A1 true EP0840690A1 (en) | 1998-05-13 |
EP0840690B1 EP0840690B1 (en) | 1999-09-22 |
Family
ID=9481422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96926441A Expired - Lifetime EP0840690B1 (en) | 1995-07-26 | 1996-07-22 | Offshore oil rig |
Country Status (10)
Country | Link |
---|---|
US (1) | US6024040A (en) |
EP (1) | EP0840690B1 (en) |
JP (1) | JP3905557B2 (en) |
KR (1) | KR100442502B1 (en) |
BR (1) | BR9610018A (en) |
ES (1) | ES2140883T3 (en) |
FR (1) | FR2737179B1 (en) |
NO (1) | NO314717B1 (en) |
OA (1) | OA10656A (en) |
WO (1) | WO1997005011A1 (en) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1010884C2 (en) * | 1998-12-23 | 2000-06-26 | Hans Van Der Poel | Work ship. |
US6652192B1 (en) | 2000-10-10 | 2003-11-25 | Cso Aker Maritime, Inc. | Heave suppressed offshore drilling and production platform and method of installation |
US6524032B2 (en) | 2000-10-10 | 2003-02-25 | Cso Aker Maritime, Inc. | High capacity nonconcentric structural connectors and method of use |
US6666624B2 (en) | 2001-08-07 | 2003-12-23 | Union Oil Company Of California | Floating, modular deepwater platform and method of deployment |
US6701861B2 (en) | 2002-05-03 | 2004-03-09 | Friede & Goldman, Ltd. | Semi-submersible floating production facility |
US6761124B1 (en) * | 2002-09-28 | 2004-07-13 | Nagan Srinivasan | Column-stabilized floating structures with truss pontoons |
US6718901B1 (en) | 2002-11-12 | 2004-04-13 | Technip France | Offshore deployment of extendable draft platforms |
US6942427B1 (en) | 2003-05-03 | 2005-09-13 | Nagan Srinivasan | Column-stabilized floating structure with telescopic keel tank for offshore applications and method of installation |
US7037044B2 (en) * | 2003-10-15 | 2006-05-02 | Technip France | Deck-to-column connection for extendable draft platform |
US7467912B2 (en) * | 2004-09-30 | 2008-12-23 | Technip France | Extendable draft platform with buoyancy column strakes |
US7854570B2 (en) * | 2008-05-08 | 2010-12-21 | Seahorse Equipment Corporation | Pontoonless tension leg platform |
FR2934635B1 (en) | 2008-07-29 | 2010-08-13 | Technip France | FLEXIBLE UPLINK CONDUIT FOR HYDROCARBON TRANSPORT FOR LARGE DEPTH |
CN101857072B (en) * | 2010-06-09 | 2012-09-26 | 中国海洋石油总公司 | Unconditional stability equipped deep-draft floating production platform and offshore installation method thereof |
US9032896B2 (en) | 2010-06-09 | 2015-05-19 | China National Offshore Oil Corporation | Grouting and welding combined connection joint applied to a deepwater floating type platform and an offshore installation method thereof |
US8757081B2 (en) | 2010-11-09 | 2014-06-24 | Technip France | Semi-submersible floating structure for vortex-induced motion performance |
US8707882B2 (en) | 2011-07-01 | 2014-04-29 | Seahorse Equipment Corp | Offshore platform with outset columns |
US8757082B2 (en) | 2011-07-01 | 2014-06-24 | Seahorse Equipment Corp | Offshore platform with outset columns |
KR101358302B1 (en) * | 2012-03-22 | 2014-02-05 | 삼성중공업 주식회사 | Semisubmersible floating structure |
KR101313809B1 (en) * | 2012-05-04 | 2013-09-30 | 삼성중공업 주식회사 | Jack-up platform |
KR101313204B1 (en) * | 2012-05-08 | 2013-09-30 | 삼성중공업 주식회사 | Jack-up platform |
CN108262864B (en) * | 2017-12-22 | 2020-09-01 | 中铁大桥局集团第四工程有限公司 | Underwater drilling positioning device and positioning method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO823489L (en) * | 1982-10-20 | 1984-04-24 | Kvaerner Eng | LIQUID OFFSHORE PLATFORM. |
US4864958A (en) * | 1987-09-25 | 1989-09-12 | Belinsky Sidney I | Swap type floating platforms |
US4784529A (en) * | 1987-10-06 | 1988-11-15 | Conoco Inc. | Mooring apparatus and method of installation for deep water tension leg platform |
NO882421L (en) * | 1988-06-02 | 1989-12-04 | Per Herbert Kristensen | FLOW CONSTRUCTION. |
FR2713588B1 (en) * | 1993-12-09 | 1996-03-01 | Technip Geoproduction | Self-elevating platform for deep oil exploitation. |
US5588369A (en) * | 1994-05-12 | 1996-12-31 | Zedd Technologies Inc. | Passive stabilization platform |
-
1995
- 1995-07-26 FR FR9509112A patent/FR2737179B1/en not_active Expired - Fee Related
-
1996
- 1996-07-22 ES ES96926441T patent/ES2140883T3/en not_active Expired - Lifetime
- 1996-07-22 BR BR9610018A patent/BR9610018A/en not_active IP Right Cessation
- 1996-07-22 WO PCT/FR1996/001151 patent/WO1997005011A1/en active IP Right Grant
- 1996-07-22 KR KR10-1998-0700611A patent/KR100442502B1/en not_active IP Right Cessation
- 1996-07-22 EP EP96926441A patent/EP0840690B1/en not_active Expired - Lifetime
- 1996-07-22 US US09/000,470 patent/US6024040A/en not_active Expired - Lifetime
- 1996-07-22 JP JP50727697A patent/JP3905557B2/en not_active Expired - Fee Related
-
1998
- 1998-01-23 OA OA9800010A patent/OA10656A/en unknown
- 1998-01-26 NO NO19980339A patent/NO314717B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9705011A1 * |
Also Published As
Publication number | Publication date |
---|---|
NO980339D0 (en) | 1998-01-26 |
FR2737179B1 (en) | 1997-10-17 |
NO980339L (en) | 1998-03-26 |
EP0840690B1 (en) | 1999-09-22 |
JP3905557B2 (en) | 2007-04-18 |
BR9610018A (en) | 1999-07-06 |
WO1997005011A1 (en) | 1997-02-13 |
OA10656A (en) | 2002-09-19 |
JPH11509803A (en) | 1999-08-31 |
NO314717B1 (en) | 2003-05-12 |
KR19990035950A (en) | 1999-05-25 |
US6024040A (en) | 2000-02-15 |
ES2140883T3 (en) | 2000-03-01 |
KR100442502B1 (en) | 2004-10-08 |
FR2737179A1 (en) | 1997-01-31 |
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