EP0963906A1 - Procédé d'installation d'une plate-forme gravitaire auto-élévatrice pour l'exploitation d'un champ pétrolier en mer - Google Patents
Procédé d'installation d'une plate-forme gravitaire auto-élévatrice pour l'exploitation d'un champ pétrolier en mer Download PDFInfo
- Publication number
- EP0963906A1 EP0963906A1 EP99401357A EP99401357A EP0963906A1 EP 0963906 A1 EP0963906 A1 EP 0963906A1 EP 99401357 A EP99401357 A EP 99401357A EP 99401357 A EP99401357 A EP 99401357A EP 0963906 A1 EP0963906 A1 EP 0963906A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bridge
- substructure
- platform
- base
- columns
- 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
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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
- B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
- E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0052—Removal or dismantling of offshore structures from their offshore location
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/0069—Gravity structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/0073—Details of sea bottom engaging footing
- E02B2017/0086—Large footings connecting several legs or serving as a reservoir for the storage of oil or gas
Definitions
- the present invention relates to a method installation of a self-elevating gravity platform, designed in particular for the exploitation of a field tanker at sea and, more particularly, to such method of installing a platform of the type which includes a buoyant substructure consisting of a base and at least two columns projecting upwards of said base, and a buoyant bridge mounted on said columns.
- the installation process of the platform described in the aforementioned patent is to tow a set floating consisting of the substructure and a hull deck buoyable mounted on it to the installation site final, to ballast the substructure to bring down this one towards the bottom while the hull deck floats at the water surface, to stop the ballasting of the substructure when the base reaches a depth predetermined and then block the hull deck on the base columns, then unpack the substructure until the hull deck is raised to a predetermined height above the water surface, and, finally, to connect the substructure to the seabed by anchor lines.
- This installation process is particularly attractive in that it makes it possible to deploy the platform by the only deck buoyancy game and ballasting / deballasting of the substructure, which makes an implementation process particularly economical, especially since, moreover, the platform can be built entirely alongside or in dry dock.
- the object of the present invention is precisely to provide a method of installing such a platform gravity on a medium depth oil field, which retains the economic advantages mentioned above of method of installing a semi-submersible platform "self-elevating" on a very deep field described in the aforementioned patent.
- the present invention also aims to provide a platform designed for the implementation of this process, said platform comprising in particular, advantageously, storage means for products extracted from the field tanker.
- step c) the predetermined depth reached by the base is close to the sum of its air draft on the final installation site and the depth of the seabed on this site.
- the platform shown essentially comprises a substructure 1 and a bridge 2.
- the substructure 1 comprises a base 3 of rectangular plane and at least two, and in the example shown four, columns 4 i (i from 1 to 4) projecting upwards from the base 3, the bridge 2 being fixed to the upper end of these columns as shown in FIG. 1.
- the substructure 1 represented is given only by way of illustrative and nonlimiting example. This is how that its base could just as well have a shape square, triangular, circular or other.
- the base is intended to rest on the seabed 9. It takes the form of a parallelepipedic box advantageously comprising storage compartments for products extracted from the oil field and compartments ballasting / deballasting. These are used during the installation of the platform, as we will see further.
- the base forms in operation a foundation of the platform ensuring the stability of this one by the simple effect weight as it is known in art.
- Columns 4 i can be made from the same material as the base or from a different material. Their function is to support the bridge. They also delimit flotation compartments and can accommodate various so-called “utility” materials, such as pipes, pumps, various fluid reservoirs, etc.
- the columns shown by way of example have a parallelepiped shape. They could also be of frustoconical or cylindrical shape for example. They each have a vertical face which faces the bridge 2 as shown in Figure 2 where it appears that a rectangular base 5 of the bridge 2 tangent to the four columns 4 i , inside a space delimited by them . This arrangement allows lateral guidance of the bridge by these columns, during the ballasting of the substructure, as will be seen below.
- the bridge preferably has a structure metallic whose base 5 takes the form of a box, or hull, ensuring the buoyancy of the deck, hence the name deck-hull given to this type of deck. He wears classic equipment: derrick 6, crane 7, quarters 8, etc ... necessary for the execution of drilling of underwater wells, then upwelling products extracted from wells.
- the bridge 2 is movable vertically with respect to the columns 4 i of the substructure 1, like that of the self-elevating platform described in the aforementioned patent, and therefore comprises means for lateral guidance at the interfaces between the base 5 of the bridge and the columns 4 i and of the means for locking the bridge on the columns.
- locking means 10 1 , 10 2 there is shown very diagrammatically in FIG. 1 locking means 10 1 , 10 2 , the two other columns receiving identical locking means.
- FIGS. 4A to 4H describe the installation process according to the invention of the platform of Figures 1 and 2.
- FIG. 4A the substructure 1 is shown at the end of its construction in a dry dock 11, with a draft of the order of about fifteen meters for example.
- FIG. 4B illustrates the impoundment of this dry dock, the substructure 1 then being floated.
- a tugboat 12 pulls the substructure 1 out of the hold 11 to a site (FIG. 4C) where the deck 2 is placed on the base 3 of the substructure 1.
- the deck 2, floating on its hull 5, is engaged between the columns 4 i of the substructure 1, suitably ballasted to allow the hull 5 to pass over the upper face of the base 3 of this substructure .
- the base 3 is then deballasted (FIG. 4D) from so that the hull deck rests on the base and the sub-structure / deck-hull assembly can be towed to an intermediate sheltered site ( Figure 4E) of which, according to the invention, the seabed is deep higher than the bottom of the final installation site of the platform, for a reason that will appear in the after.
- the ballasting of the base 3 is resumed, ensuring the descent of the substructure 1 and the floating hull deck 2.
- the hydrostatic stability of the assembly is ensured by the buoyancy of the hull deck 2 on the surface of the water, the substructure 1 alone may not be stable in all the immersion phases.
- the columns 4 i laterally guide the hull deck 2 during this descent, as described in the aforementioned patent.
- the ballasting of the base 3 is stopped (FIG. 4F), the latter then having reached a predetermined depth substantially equal to the sum of the depth of the seabed of the final installation site of the platform (approximately 40 meters for example) and of the draft of the hull deck above the water, on this same final site (approximately 20 meters by example). This is why the depth of the bottom of the intermediate platform deployment site, at least 60 meters in the example given, must be greater than the depth of the final platform installation site.
- the locking means 10 i are then actuated to prevent any further relative movement of the substructure 1 relative to the hull deck 2 (FIG. 4F).
- the substructure is then deballasted to make raise the underside of the base 3 to a depth lower than that of the final installation site (Figure 4G) so as to allow towing of the platform to this site.
- Figure 4H we ballast again the substructure until this one come to rest on the seabed 9, so as to ensure the stability of the platform on this background. In this position, deck 2 emerges over the water with the suitable air draft, set as explained above in link with FIG. 4F.
- the platform could take the form from that shown in Figure 3 which does not differ from that Figures 1 and 2 that in that the bridge does not include hull and is therefore not independently buoyant.
- the installation of this platform takes place substantially as described in connection with Figures 4A to 4H, at this except that Figure 4C 'should be substituted for Figure 4C.
- the present invention achieves the goals set, namely to achieve a gravity platform designed to be installed in shallow water and retaining the economic benefits of self-elevating platforms for which on-site installation is achieved by the only game of the gravity and the buoyancy exerted on its constituents, without the use of lifting mechanisms expensive.
- the installation of the fully equipped bridge on the structure also saves money heavy and expensive lifting means that are required in the case of installation of the bridge and the equipment in sea after the installation of the substructure on its final site operating.
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Earth Drilling (AREA)
Abstract
Description
- les figures 1 et 2 sont des vues en élévation et en plan respectivement, d'un premier mode de réalisation d'une plate-forme conçue pour la mise en oeuvre du procédé suivant l'invention, la vue en plan ne faisant pas apparaítre les équipements portés par le pont de la plate-forme, pour la clarté du dessin,
- la figure 3 est une vue en élévation d'une variante de la plate-forme des figures 1 et 2, et
- les figures 4A à 4H illustrent le procédé d'installation suivant l'invention, des plates-formes des figures 1 à 3.
Claims (7)
- Procédé d'installation d'une plate-forme gravitaire auto-élévatrice, pour l'exploitation d'un champ pétrolier en mer, ladite plate-forme comportant une sous-structure flottable (1) constituée d'une embase (3) et d'au moins deux colonnes (4i) débordant vers le haut de ladite embase, et un pont flottable (2) monté sur lesdites colonnes (4i) caractérisé en ce que :a) on remorque un ensemble flottant constitué par la sous-structure (1) et le pont flottable (2) reposant sur l'embase (3) de ladite sous-structure (1), jusqu'à un site abrité intermédiaire de profondeur supérieure à celle du site d'installation final de la plate-forme,b) on ballaste la sous-structure (1) pour faire descendre celle-ci vers le fond alors que le pont (2) flotte à la surface de l'eau,c) on arrête le ballastage de la sous-structure (1) quand l'embase (3) atteint une profondeur prédéterminée et on bloque alors le pont (2) sur les colonnes (4i) de l'embase (3),d) on déballaste ladite sous-structure (1) jusqu'à ce que le pont soit remonté à une hauteur prédéterminée au-dessus de la surface de l'eau,e) on remorque l'ensemble jusqu'au site d'installation final, etf) on ballaste de nouveau la sous-structure (1) jusqu'à ce qu'elle repose sur le fond marin.
- Procédé conforme à la revendication 1, caractérisé en ce que la flottabilité du pont (2) est assurée par une coque étanche (5) intégrée au pont.
- Procédé conforme à la revendications 1, caractérisé en ce que la flottabilité du pont (2) est assurée par une barge (13) sur laquelle il est monté temporairement, celle-ci étant dégagée de la plate-forme après le blocage du pont sur les colonnes (4i).
- Plate-forme pour la mise en oeuvre du procédé conforme à l'une quelconque des revendications 1 à 3, caractérisée en ce qu'elle comprend a) une sous-structure (1) flottable constituée d'une embase (3) et d'au moins deux colonnes (4i) débordant vers le haut de ladite embase (3), b) un pont (2) monté sur lesdites colonnes (4i), c) des moyens de ballastage et de déballastage d'au moins ladite embase (3) de ladite sous-structure (1), d) des moyens de guidage latéral dudit pont (2) sur lesdites colonnes (4i) lors du déploiement de la plate-forme dans une configuration prédéterminée par ballastage de la sous-structure (1) alors que le pont (2) est en flottaison et e) des moyens de verrouillage dudit pont sur ladite colonne (4i), dans ladite configuration prédéterminée.
- Plate-forme conforme à la revendication 4, caractérisée en ce que ledit pont (2) est du type pont-coque à flottabilité positive.
- Plate-forme conforme à la revendication 4, caractérisée en ce que ledit pont (2) est conçu pour être monté sur une barge (13) lors du remorquage et du déploiement de la plate-forme, des moyens étant prévus pour dégager la barge de la plate-forme après le verrouillage du pont sur les colonnes (4i).
- Plate-forme conforme à l'une quelconque des revendications 4 à 6, caractérisée en ce que ladite embase comprend des compartiments de stockage de produits extraits du champ pétrolier.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9807176A FR2779408B1 (fr) | 1998-06-08 | 1998-06-08 | Procede d'installation d'une plate-forme gravitaire auto-elevatrice pour l'exploitation d'un champ petrolier en mer |
FR9807176 | 1998-06-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0963906A1 true EP0963906A1 (fr) | 1999-12-15 |
EP0963906B1 EP0963906B1 (fr) | 2002-04-03 |
Family
ID=9527129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19990401357 Expired - Lifetime EP0963906B1 (fr) | 1998-06-08 | 1999-06-04 | Procédé d'installation d'une plate-forme gravitaire auto-élévatrice pour l'exploitation d'un champ pétrolier en mer |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0963906B1 (fr) |
FR (1) | FR2779408B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103619701A (zh) * | 2011-04-26 | 2014-03-05 | Ihc荷兰Ie有限公司 | 包括月池和提升装置的船以及将物品下降入海的方法 |
RU2512783C1 (ru) * | 2012-10-09 | 2014-04-10 | Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" | Морская гравитационная платформа |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106836164B (zh) * | 2016-12-15 | 2019-11-08 | 大连船舶重工集团有限公司 | 一种旋转式多方位移动悬臂梁 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1470893A (en) * | 1973-10-12 | 1977-04-21 | Doris Dev Richesse Sous Marine | Platforms for maritime installations |
GB1523585A (en) * | 1975-10-28 | 1978-09-06 | Brewerton R W | Offshore platforms |
US4126011A (en) * | 1976-05-20 | 1978-11-21 | Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C.G. Doris" | Method of fabrication of offshore structures and offshore structures made according to the method |
FR2400086A1 (fr) * | 1977-08-08 | 1979-03-09 | Sea Tank Co | Procede et dispositif de mise en place d'un pont de travail sur les colonnes d'une structure-poids offshore |
WO1997006340A1 (fr) * | 1995-08-10 | 1997-02-20 | Deep Oil Technology, Inc. | Plate-forme de forage en mer et procede d'exploitation petroliere |
FR2772336A1 (fr) | 1997-12-12 | 1999-06-18 | Doris Engineering | Plate-forme semi-submersible d'exploitation d'un champ petrolier en mer et procede d'installation d'une telle plate-forme |
-
1998
- 1998-06-08 FR FR9807176A patent/FR2779408B1/fr not_active Expired - Fee Related
-
1999
- 1999-06-04 EP EP19990401357 patent/EP0963906B1/fr not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1470893A (en) * | 1973-10-12 | 1977-04-21 | Doris Dev Richesse Sous Marine | Platforms for maritime installations |
GB1523585A (en) * | 1975-10-28 | 1978-09-06 | Brewerton R W | Offshore platforms |
US4126011A (en) * | 1976-05-20 | 1978-11-21 | Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C.G. Doris" | Method of fabrication of offshore structures and offshore structures made according to the method |
FR2400086A1 (fr) * | 1977-08-08 | 1979-03-09 | Sea Tank Co | Procede et dispositif de mise en place d'un pont de travail sur les colonnes d'une structure-poids offshore |
WO1997006340A1 (fr) * | 1995-08-10 | 1997-02-20 | Deep Oil Technology, Inc. | Plate-forme de forage en mer et procede d'exploitation petroliere |
FR2772336A1 (fr) | 1997-12-12 | 1999-06-18 | Doris Engineering | Plate-forme semi-submersible d'exploitation d'un champ petrolier en mer et procede d'installation d'une telle plate-forme |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103619701A (zh) * | 2011-04-26 | 2014-03-05 | Ihc荷兰Ie有限公司 | 包括月池和提升装置的船以及将物品下降入海的方法 |
CN103619701B (zh) * | 2011-04-26 | 2017-08-01 | Ihc荷兰Ie有限公司 | 包括月池和提升装置的船以及将物品下降入海的方法 |
RU2512783C1 (ru) * | 2012-10-09 | 2014-04-10 | Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" | Морская гравитационная платформа |
Also Published As
Publication number | Publication date |
---|---|
FR2779408B1 (fr) | 2000-07-21 |
FR2779408A1 (fr) | 1999-12-10 |
EP0963906B1 (fr) | 2002-04-03 |
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