EP0979923A1 - Installation d'exploitation d'un gisement en mer et procédé d'implantation d'une colonne montante - Google Patents
Installation d'exploitation d'un gisement en mer et procédé d'implantation d'une colonne montante Download PDFInfo
- Publication number
- EP0979923A1 EP0979923A1 EP99402019A EP99402019A EP0979923A1 EP 0979923 A1 EP0979923 A1 EP 0979923A1 EP 99402019 A EP99402019 A EP 99402019A EP 99402019 A EP99402019 A EP 99402019A EP 0979923 A1 EP0979923 A1 EP 0979923A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- float
- riser
- platform
- column
- traction
- 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
- 238000009434 installation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 230000000630 rising effect Effects 0.000 claims abstract description 13
- 238000005303 weighing Methods 0.000 claims description 2
- 230000001174 ascending effect Effects 0.000 claims 1
- 238000005192 partition Methods 0.000 description 4
- 238000002513 implantation Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000005921 Cynara humilis Nutrition 0.000 description 1
- 240000002228 Cynara humilis Species 0.000 description 1
- 238000012550 audit Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- E21B19/006—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 including heave compensators
-
- 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
- E21B17/01—Risers
- E21B17/012—Risers with buoyancy elements
Definitions
- the present invention relates to an installation for operating a offshore deposit, of the type comprising a semi-submersible platform, at least one riser connecting the platform to the seabed F, and means for energizing said riser.
- Semi-submersible platforms are intended for exploitation oil in deep seas or oceans. They include a shell supported by legs whose lower part is connected to a hollow base. The legs are fitted with buoyancy boxes. The base and the boxes ensure the buoyancy and the stability of the platform. The shell, attached to the legs, is held above the surface of the sea during operation of the installation.
- risers generally designated by the English term “riser” connects the platform to the seabed. These columns risers are made of metal tubes.
- the means of energizing risers have hydropneumatic actuators arranged between the head of the riser and the platform. These cylinders must have sufficient travel to compensate for displacement relative between the head of the riser and the platform. Of more, these must be strong enough to support the traction tensioning of the riser.
- the object of the invention is to propose an operating installation in which the energization of the or each riser does not not require the implementation of complex and bulky means on the hull of the platform.
- the invention relates to an operating installation a deposit at sea, of the aforementioned type, characterized in that the means for tensioning include, for the or each riser, at least one submerged float, connected at a point in the current part of the riser for its traction towards the surface, and a mechanism for traction of the riser, which mechanism is installed on the platform and applied at the top of the riser.
- FIG 1 is schematically shown a platform semi-submersible self-elevating oil tanker 10. She is willing in a region of great depth, this being for example equal to 1300 m.
- the platform essentially comprises an upper shell 12 extending above the surface M of the sea, when the platform is in the operating phase.
- the shell 12 is connected, by four legs 14 provided buoyancy boxes 15, to a submerged lower base 16.
- the upper shell contains technical residential buildings not represented as well as a derrick 18.
- the shell 12 and the base 16 are all two square in shape and have through ducts in their center 20, 22 intended for the passage of a riser 24.
- the column 24 is connected at its lower end to an operating well.
- FIG 1 only a riser 24 is shown. In practical, several risers are arranged between the platform 10 and the seabed. Vertical conduits analogous to conduits 20 and 22 are provided for each riser.
- the total weight of each riser 24 is, for example, 100 tons. Its diameter is 10 inches or about 25 cm.
- Mooring lines 26, kept under tension, are installed between the submerged base 16 and the seabed to immobilize the platform above the deposit.
- Each riser 24 is associated with setting means under pressure.
- these tensioning means comprise, for each riser, at least one submerged float 28, connected at a point in the current part of the riser for its traction towards the surface, and a mechanism 30 for traction of the column rising, which mechanism is installed on platform 10 and is applied at the head of the riser 24.
- the submerged float 28 is disposed at the depth of the base 16. It is thus mounted vertically displaceable in passage 22.
- the float 28 has the shape of a sleeve.
- the height of the float is for example 13 m and its diameter outside is for example 4.5 meters.
- a passage 32 is defined along the axis of the float. The riser 24 is engaged through of it.
- the diameter of the passage 32 is for example 1.7 m. It is advantageously greater than three times the current diameter of the column rising 24.
- the float 28 consists of a toroidal box 34 delimited by metal walls.
- the interior of the box is filled with synthetic foam 36 low density.
- Box 34 is separated into three compartments separated by radial partitions 38 extending over the entire height of the float. These partitions arise along the wall delimiting the passage 32 and project radially out of the box 34.
- Means 40 for guiding the float in the vertical direction are provided between the float 28 and the base 16 of the platform.
- These guide means 40 for example include sliding pads 42 carried by the end of the radial partitions 38 projecting out of the box. These sliding pads are free to slide in slides guide 44 arranged longitudinally along passage 22.
- the guide rails 44 are for example delimited by angles in U extending along the entire thickness of the base 16 is approximately 10 m.
- the pads 42 are continuous and extend over a length equal to that of the guide rails 44. As a variant, these are constituted separate elements distributed over the height of the radial partitions 38.
- the positions slides and pads are reversed.
- the skates, which are then carried by the base, are integral with an attached guide jacket and fixed in the through conduit 22.
- the guide sleeve is removed and replaced with a sleeve bearing new skates.
- means 46 for axial connection of the float 28 and the riser 24 are provided in passage 32. These means of link are formed by a ball joint arrangement, allowing free travel angle of the riser 24 relative to the float 28.
- This ball joint arrangement advantageously comprises an annular seat concave 48 integral with float 28 and a flange with a convex surface 50 carried by the riser 24.
- the annular seat 48 is advantageously arranged in half bottom of passage 32. It defines a frustoconical concave surface 52 facing up. This is intended to form a bowl surface intended to support the flange 50.
- the seat 48 is crossed by a conduit 54 suitable for the passage of the riser 24.
- the conduit 54 for example has a diameter of 1 m.
- the flange 50 facing the bearing surface 52 a convex surface 56, formed for example by a spherical crown.
- the largest diameter of the flange 50 is less than the diameter from passage 32.
- the riser 24 In its zone of connection to the collar 50, the riser 24 has an extra thickness, in order to reinforce its structure.
- the thickness of the riser is gradually decreasing along two sections denoted 57, 58 oriented up and down respectively.
- sections for example, each have a length of 3 m. They constitute sections of variable inertia ensuring a regular distribution constraints over their entire length.
- the latches 60 each comprise for example a hydraulic actuator controllable from hull 12 or from an intervention vehicle remote controlled underwater. They allow the establishment of a pin 64 at the upper end of the slides 44.
- the pins 64 can be moved between a retracted position in which they allow free sliding of the pads 42 in the slides 44 and an active stop position as shown in the Figures 2 and 3, in which they prohibit the upward movement of skates 42.
- the float is sized to apply to the riser a tensile force between 1 and 3 times the weight of the column.
- the force of traction exerted by the float is for example between 1000 kN and 2000 kN.
- this tensile force is substantially equal at 1500 kN.
- the force applied by the head tension 30 is substantially equal to 500 kN.
- the float 28 is dimensioned to apply on the riser a tensile force greater than the force of traction applied by the head traction mechanism 30.
- the pulling force of the float is between 1 and 10 times the traction force applied by the traction mechanism of head.
- the float applies to the riser a traction force substantially equal to 3 times the applied traction force by the head traction mechanism 30.
- the float is sized so that the capacity of the head traction mechanism is a maximum of 500 kN.
- the head pull mechanism 30, shown in Figure 4 comprises two hydropneumatic cylinders 70 mounted in parallel.
- a cable 76 for tensioning the column riser 24 is engaged around the pulleys. Cable 76 is passed over a return pulley 78 and directed towards the head of the riser at which it is fixed.
- the jacks 70 are supplied with a hydraulic fluid by an assembly of hydraulic pressure regulations noted 80.
- the variation hydraulic pressure in the jacks 70 allows the control of their travel.
- the engagement of the cable 76 between the pulleys 72 and 74 ensures a reduction in the travel of the cylinders, so that for ensure at the head of the riser 24 a clearance axial of 15.2 m, the stroke of the cylinders is only 3.8 m.
- the head traction mechanisms 30 are integrated into the thickness of the shell 12 as shown in Figure 1. Thus, they do not clutter not the upper hull deck 12.
- the head traction means 30 are offset on the side walls of the hull, the cables 76 then circulating from the rail up to the column head through the shell 12.
- the diameter of the conduit 32 through which the column passes rising 24 being much greater than the diameter thereof, and the connection between the float and the riser being provided by a ball joint, the column rising is free to move angularly relative to the float, this which reduces the stresses applied on the riser 24.
- FIGS. 5A to 5E a first embodiment is illustrated. place of a riser 24.
- the riser 24 is first submerged with its lower end kept away from the bottom F.
- the float 28 is held in abutment against the pins 64, preventing thus the rise of the float.
- the flange 50 is substantially to the depth of the seat 48.
- the bottom of the float 28 is flush substantially bottom of the base 16.
- the platform 10 is ballasted, for example by partially filling the base 16.
- the platform 10 sinks to a depth l as shown in Figure 5B.
- the depth l is for example equal to 1.5m.
- the derrick 18 the column rising 24 is recalled upwards when lowering from the platform, so that the lower end of the riser stays away from the seabed F by an interval J and is for example one meter from the background.
- the flange 50 is disposed above the seat 48 and is spaced therefrom by an interval K substantially equal to 1.5 m.
- the next phase of the process first involves linking the mechanism head pull 30 to the riser 24, then gradually unpack the platform, until the flange 50 comes to bear on the seat 48, as shown in Figure 5D.
- the platform 10 is thus raised by the interval K '.
- the derrick 18 is gradually released to allow relative movement between the riser and the platform.
- the float 28 exerts a restoring force towards the surface of the lower part of the riser.
- the head traction means 30 are actuated so as to ensure the traction of the upper section of the riser 24 included between the derrick 18 and the float 28.
- FIGS. 6A to 6D Another method of placing a riser in a installation according to the invention is illustrated in FIGS. 6A to 6D.
- the hull 12 of the platform is equipped with 90 winches for hanging an annular ballast 92 above the float 28.
- the annular ballast 92 is formed by two half-rings assembled around the riser 24. The length of the winch is sufficient to deposit ballast 92 on the upper annular surface of the float 28.
- the weight of the ballast 92 is adapted to ensure the insertion of the float 28 towards the bottom.
- the riser 24 is submerged with its lower end held at a distance of the bottom F.
- the float 28 is in abutment against the pins 64.
- ballast 92 is then conveyed as far as the float. So the float 28 is caused to sink as shown in Figure 6B ,.
- the riser After sufficient insertion of the float 28, the riser is lowered and its lower end is connected to an operating well of oil as shown in Figure 6C. Because of the depression of float 28, the collar 50 of the riser is away from the seat 48. Under these conditions, the riser 24 is relaxed, allowing its connection to the operating well.
- the ballast 92 is raised, as shown in FIG. 6D.
- the float 28 tends to rise to the surface, so that it exerts on the riser 24 a force of upward traction applied on the flange 50.
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Geophysics And Detection Of Objects (AREA)
- Foundations (AREA)
Abstract
Description
- le ou chaque flotteur est dimensionné pour appliquer sur la colonne montante, une force de traction supérieure à la force de traction appliquée par le mécanisme de traction de tête ;
- le flotteur est dimensionné pour appliquer sur la colonne montante une force de traction comprise entre 1 et 3 fois le poids de la colonne montante ;
- la plate-forme comporte une embase immergée et une coque émergée reliée par des jambes, le ou chaque flotteur étant disposé à la profondeur de ladite embase, laquelle embase comporte des moyens de guidage vertical du ou de chaque flotteur ;
- l'embase comporte, pour chaque flotteur, un passage vertical au travers duquel le flotteur est mobile axialement ;
- elle comporte des moyens de mise en butée du flotteur contre la plate-forme, suivant le sens ascendant ;
- le ou chaque flotteur présente un conduit traversant dans lequel s'étend la colonne montante associée ;
- les moyens assurant la liaison entre le ou chaque flotteur et la colonne montante associée comportent une rotule;
- la rotule comporte un siège annulaire concave solidarisé audit flotteur dans le conduit axial et une collerette à surface convexe portée par la colonne montante, la collerette étant appliquée contre le siège concave pour l'application de la traction sur la colonne montante ;
- le conduit traversant a un diamètre supérieur à trois fois le diamètre de la colonne montante ; et
- le mécanisme de traction de tête comporte au moins un vérin hydropneumatique comportant à chaque extrémité un ensemble de poulies mouflées sur lesquelles est engagé au moins un brin de traction appliqué à ladite colonne montante.
- la figure 1 est une vue en élévation d'une installation d'exploitation pétrolière selon l'invention;
- les figures 2 et 3 sont des vues en coupe respectivement longitudinales et transversales d'un flotteur de traction de la colonne montante de l'installation de la figure 1;
- la figure 4 est une vue en perspective de moyens de traction de tête d'une colonne montante;
- les figures 5A, 5B, 5C, 5D et 5E sont des vues schématiques montrant l'installation pétrolière de la figure 1 à des stades successifs d'implantation d'une colonne montante; et
- les figures 6A, 6B, 6C, 6D sont des vues analogues aux figures 5A à 5E, illustrant un second procédé de mise en place d'une colonne montante.
Claims (12)
- Installation d'exploitation d'un gisement en mer, du type comportant une plate-forme semi-submersible (10), au moins une colonne montante (24) reliant la plate-forme (10) au fond marin F, et des moyens (28,30) de mise sous tension de ladite colonne montante (24), caractérisée en ce que les moyens de mise sous tension comportent, pour la ou chaque colonne montante (24), au moins un flotteur (28) immergé, relié en un point de la partie courante de la colonne montante (24) pour sa traction vers la surface, et un mécanisme (30) de traction de la colonne montante (24), lequel mécanisme (30) est installé sur la plate-forme (10) et appliqué en tête de la colonne montante (24), et en ce qu'elle comporte des moyens (60) de mise en butée du flotteur (28) contre la plate-forme (10), suivant le sens ascendant.
- Installation selon la revendication 1, caractérisée en ce que le ou chaque flotteur (28) est dimensionné pour appliquer sur la colonne montante (24), une force de traction supérieure à la force de traction appliquée par le mécanisme (30) de traction de tête.
- Installation selon la revendication 1 ou 2, caractérisée en ce que le flotteur (28) est dimensionné pour appliquer sur la colonne montante (24) une force de traction comprise entre 1 et 3 fois le poids de la colonne montante (24).
- Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que la plate-forme (10) comporte une embase immergée (16) et une coque émergée (12) reliée par des jambes (14), le ou chaque flotteur (28) étant disposé à la profondeur de ladite embase (16), laquelle embase comporte des moyens (40) de guidage vertical du ou de chaque flotteur (28).
- Installation selon la revendication 4, caractérisée en ce que l'embase (16) comporte, pour chaque flotteur (28), un passage vertical (22) au travers duquel le flotteur (28) est mobile axialement.
- Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que le ou chaque flotteur (28) présente un conduit traversant (32) dans lequel s'étend la colonne montante associée (24).
- Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que les moyens assurant la liaison entre le ou chaque flotteur (28) et la colonne montante (24) associée comporte une rotule (46).
- Installation selon les revendications 6 et 7 prises ensemble, caractérisée en ce que la rotule comporte un siège annulaire concave (48) solidarisé audit flotteur (28) dans le conduit axial (32) et une collerette (50) à surface convexe (56) portée par la colonne montante (24), la collerette (50) étant appliquée contre le siège concave (48) pour l'application de la traction sur la colonne montante (24).
- Installation selon la revendication 6, caractérisée en ce que le conduit traversant (32) a un diamètre supérieur à trois fois le diamètre de la colonne montante (24).
- Installation selon l'une quelconque des revendications précédente, caractérisée en ce que le mécanisme de traction de tête (30) comporte au moins un vérin hydropneumatique (70) comportant à chaque extrémité un ensemble de poulies mouflées (72, 74) sur lesquelles est engagé au moins un brin (76) de traction appliqué à ladite colonne montante (24).
- Procédé d'implantation d'une colonne montante (24) d'une installation selon la revendication 1, caractérisé en ce qu'il comporte les étapes successives consistant à:a - assurer la mise en butée verticale du flotteur (28) contre la plate-forme (10);b - immerger la colonne montante (24) avec son extrémité inférieure maintenue à distance du fond marin F;c- ballaster la plate-forme (10);d- descendre la colonne montante (24) et relier celle-ci au fond marin F;e - dégager la butée entre le flotteur (28) et la plate-forme (10); etf- déballaster la plate-forme (10).
- Procédé d'implantation d'une colonne montante (24) d'une installation selon la revendication 1, caractérisé en ce qu'il comporte les étapes consistant à:a - assurer la mise en butée du flotteur (28) contre la plate-forme (10);b - immerger la colonne montante (24) avec son extrémité inférieure maintenue à distance du fond marin F;c - enfoncer vers le bas le flotteur (28) par mise en place d'un lest (92) sur le flotteur (28);d - descendre la colonne montante (24) et relier celle-ci au fond marin (F),e - dégager la butée entre le flotteur (28) et la plate-forme (10); etf - retirer le lest (92) pesant sur le flotteur (28).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9810301A FR2782341B1 (fr) | 1998-08-11 | 1998-08-11 | Installation d'exploitation d'un gisement en mer et procede d'implantation d'une colonne montante |
FR9810301 | 1998-08-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0979923A1 true EP0979923A1 (fr) | 2000-02-16 |
EP0979923B1 EP0979923B1 (fr) | 2005-01-12 |
Family
ID=9529598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99402019A Expired - Lifetime EP0979923B1 (fr) | 1998-08-11 | 1999-08-09 | Installation d'exploitation d'un gisement en mer et procédé d'implantation d'une colonne montante |
Country Status (9)
Country | Link |
---|---|
US (2) | US6347912B1 (fr) |
EP (1) | EP0979923B1 (fr) |
AU (1) | AU754800C (fr) |
BR (1) | BR9904472A (fr) |
CA (1) | CA2280399C (fr) |
EA (1) | EA001520B1 (fr) |
FR (1) | FR2782341B1 (fr) |
ID (1) | ID25956A (fr) |
NO (1) | NO315529B1 (fr) |
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NL1016610C2 (nl) * | 2000-11-15 | 2002-05-16 | Lankhorst Recycling Bv | Beschermelement voor een stijgbuissegment. |
US6679331B2 (en) * | 2001-04-11 | 2004-01-20 | Cso Aker Maritime, Inc. | Compliant buoyancy can guide |
WO2002084068A1 (fr) | 2001-04-11 | 2002-10-24 | Cso Aker Maritime, Inc. | Element de guidage pour cylindre de flottabilite adaptable |
US20030141069A1 (en) * | 2002-01-31 | 2003-07-31 | Davies Richard Lloyd | Riser buoyancy system |
US7096957B2 (en) * | 2002-01-31 | 2006-08-29 | Technip Offshore, Inc. | Internal beam buoyancy system for offshore platforms |
US6896062B2 (en) | 2002-01-31 | 2005-05-24 | Technip Offshore, Inc. | Riser buoyancy system |
US6805201B2 (en) * | 2002-01-31 | 2004-10-19 | Edo Corporation, Fiber Science Division | Internal beam buoyancy system for offshore platforms |
US7367750B2 (en) * | 2002-10-16 | 2008-05-06 | Single Buoy Moorings Inc. | Riser installation vessel and method of using the same |
EP1597141A2 (fr) * | 2003-02-28 | 2005-11-23 | Modec International, L.L.C. | Systeme porteur de colonnes de monte et procede associe |
US6886637B2 (en) * | 2003-06-19 | 2005-05-03 | Mentor Subsea Technology Services, Inc. | Cylinder-stem assembly to floating platform, gap controlling interface guide |
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US8708053B2 (en) * | 2005-03-14 | 2014-04-29 | Single Buoy Moorings, Inc. | Riser installation from offshore floating production unit |
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US8757081B2 (en) | 2010-11-09 | 2014-06-24 | Technip France | Semi-submersible floating structure for vortex-induced motion performance |
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CN104937363B (zh) | 2012-10-16 | 2017-10-20 | 阿贝尔基金会 | 包括歧管的热交换器 |
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CN112746618A (zh) * | 2020-12-29 | 2021-05-04 | 上海建工七建集团有限公司 | 一种适用于天然地基斜向跟踪注浆的施工方法 |
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1998
- 1998-08-11 FR FR9810301A patent/FR2782341B1/fr not_active Expired - Fee Related
-
1999
- 1999-08-09 EP EP99402019A patent/EP0979923B1/fr not_active Expired - Lifetime
- 1999-08-09 ID IDP990775D patent/ID25956A/id unknown
- 1999-08-10 AU AU43477/99A patent/AU754800C/en not_active Ceased
- 1999-08-10 CA CA002280399A patent/CA2280399C/fr not_active Expired - Fee Related
- 1999-08-10 US US09/370,895 patent/US6347912B1/en not_active Expired - Lifetime
- 1999-08-10 BR BR9904472-2A patent/BR9904472A/pt not_active IP Right Cessation
- 1999-08-10 NO NO19993852A patent/NO315529B1/no not_active IP Right Cessation
- 1999-08-10 EA EA199900640A patent/EA001520B1/ru not_active IP Right Cessation
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2001
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US3496898A (en) * | 1968-05-15 | 1970-02-24 | North American Rockwell | Marine riser structure |
US4099560A (en) * | 1974-10-02 | 1978-07-11 | Chevron Research Company | Open bottom float tension riser |
US4473323A (en) * | 1983-04-14 | 1984-09-25 | Exxon Production Research Co. | Buoyant arm for maintaining tension on a drilling riser |
US4617998A (en) * | 1985-04-08 | 1986-10-21 | Shell Oil Company | Drilling riser braking apparatus and method |
US4657439A (en) * | 1985-12-18 | 1987-04-14 | Shell Offshore Inc. | Buoyant member riser tensioner method and apparatus |
FR2729432A1 (fr) * | 1995-01-17 | 1996-07-19 | Elf Aquitaine | Ensemble tensionneur de tube prolongateur |
GB2317631A (en) * | 1996-09-30 | 1998-04-01 | Inst Francais Du Petrole | Production riser incorporating tensioning means and stiffening means |
Also Published As
Publication number | Publication date |
---|---|
BR9904472A (pt) | 2000-08-29 |
NO993852L (no) | 2000-02-14 |
AU754800B2 (en) | 2002-11-28 |
AU754800C (en) | 2003-06-12 |
US6406223B1 (en) | 2002-06-18 |
EA199900640A3 (ru) | 2000-04-24 |
NO993852D0 (no) | 1999-08-10 |
CA2280399A1 (fr) | 2000-02-11 |
EA199900640A2 (ru) | 2000-02-28 |
EA001520B1 (ru) | 2001-04-23 |
US20020048492A1 (en) | 2002-04-25 |
US6347912B1 (en) | 2002-02-19 |
CA2280399C (fr) | 2007-10-02 |
AU4347799A (en) | 2000-03-02 |
FR2782341B1 (fr) | 2000-11-03 |
FR2782341A1 (fr) | 2000-02-18 |
EP0979923B1 (fr) | 2005-01-12 |
ID25956A (id) | 2000-11-16 |
NO315529B1 (no) | 2003-09-15 |
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