EP0252840B1 - Oil plattform for drilling and operating at sea - Google Patents
Oil plattform for drilling and operating at sea Download PDFInfo
- Publication number
- EP0252840B1 EP0252840B1 EP87401597A EP87401597A EP0252840B1 EP 0252840 B1 EP0252840 B1 EP 0252840B1 EP 87401597 A EP87401597 A EP 87401597A EP 87401597 A EP87401597 A EP 87401597A EP 0252840 B1 EP0252840 B1 EP 0252840B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- legs
- leg
- shell
- platform
- space
- 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.)
- Expired - Lifetime
Links
- 238000005553 drilling Methods 0.000 title claims description 18
- 230000000284 resting effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
-
- 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
- E02B2017/0056—Platforms with supporting legs
- E02B2017/006—Platforms with supporting legs with lattice style supporting legs
Definitions
- the present invention relates to oil platforms and relates more particularly to self-elevating platforms for drilling and exploitation at sea.
- Self-elevating platforms generally comprise a hull mounted to move on legs which bear on the seabed, said hull in particular supporting a drilling floor and a drilling tower hereinafter called a derrick.
- platforms are known whose hull has a lateral notch making it possible to carry out drilling work and operating operations by placing the drilling and / or operating equipment at- above the notch.
- the platform of the latter type has the advantage of allowing all of the connection equipment between the underwater base of the wells above which it is placed on the one hand and the hull on the other hand to be find in the space defined by the legs of the platform and thus be relatively well protected against bad weather and floating bodies.
- an oil platform comprising a hull supported by load-bearing legs disposed at the periphery of the hull and a leg defining a space in which connection equipment is arranged between the bottom and the shell, said leg defining the space in which the connecting equipment is arranged being a supporting leg.
- a drilling floor is disposed on the hull, movable above the cross section of the leg defining the space for receiving said connecting equipment.
- the leg defining the space for receiving the equipment is a central leg.
- the platform cannot have less than four legs, which increases the cost of its manufacture.
- a platform of the aforementioned type which comprises at least four legs is supported on the seabed in at least four corresponding zones which do not necessarily all have the same consistency. There are therefore risks that, for example, one of the peripheral legs of the platform tends to sink while the other legs meet a ground allowing them to have a firm support. This results in a certain instability of the platform.
- the invention aims to create an oil platform which has good stability, which is of a relatively reduced cost price and whose connecting equipment between the bottom and the hull are protected with even greater efficiency.
- the invention also aims to create a permanent platform which can allow reassemble the well heads at the surface without tensile forces at the level of the platform.
- an oil platform comprising a hull supported by load-bearing legs bearing on the seabed and arranged at the periphery of the hull and a leg defining a space in which the connection equipment between the bottom and the hull, characterized in that the hull of the platform is of generally triangular shape and mounted displaceable on only three carrying legs, the leg defining the space for receiving said connecting equipment being one of said carrying legs, and in that a drilling floor is disposed on the movable shell above the cross section of the leg defining the space for receiving said connecting equipment.
- - Fig.1 is a schematic elevational view of a self-elevating platform according to the invention.
- - Fig.2 is a top view of the platform of Fig.1.
- the platform shown in Fig.1 is a self-elevating platform comprising a shell 1 movable mounted on legs 2,3, formed of tubular uprights 4 joined together by lattices of metal beams 5.
- the means of displacement of the shell on its legs are constituted by pinions driven by geared motors mounted on the hull, the pinions cooperating with racks carried by the legs (not shown).
- the legs 2, 3 bear on the bottom by means of respective risers 6,7 of structure similar to that of the legs and immobilized with respect to the bottom by piles 8 stuck in the ground of the seabed.
- the risers 6,7 are advantageously of the type described in patent application FR-A-2592075 in the name of the Applicant.
- the platform according to the invention is a platform whose shell 1 is of generally triangular shape.
- the shell 1 is mounted displaceable on three legs, two legs 2 of which are of triangular section and the third leg 3 of which is of larger square section than that of the legs 2.
- the leg 3 can also be of triangular section.
- On the hull 1 and above the upper end of the leg 3 of square section is mounted a drilling floor 9 movable on lateral rails 10 carried by pillars 11 fixed to the hull 1.
- the drilling floor 9 is also movable on a track 12, perpendicular to the rails 11 which allows the center of the drilling floor to occupy any of the positions indicated by the points 13 above the cross section of the leg 3 of square section.
- Drill floor 9 is associated with a movable derrick 14 with said floor.
- connection materials are arranged between the seabed and the hull.
- conduits 16 which connect the drilling floor 9 to the seabed and which extend into the space provided inside the strut 3 up to the extension 7 then into the space provided to the inside of it.
- the drilling floor 9 and the derrick 14 can occupy a position clearing the cross section of the leg 3 to allow movement of the shell 1 on the legs 2,3.
- connection materials between the bottom and the shell of the platform are protected on all sides by the walls formed by the uprights 4 and the lattices of metal beams 5, against any impact from floating bodies.
- the cross section of the leg 4 of larger section advantageously corresponds to the dimensions of the underwater base or "template" of a well or a set of wells, the points 15 representing the positions which the center of the floor can occupy. drilling of leg 4, plumb with corresponding valves not shown of the underwater base.
- the extension 7 which supports the leg 4 containing the connecting conduits 16 in fact constitutes the underwater base or template.
- Such an arrangement also has the advantage to allow to ensure in complete safety the operations of "completion" which are the operations of equipment of the underground part of the well after the drilling operations.
- conduits 16 for connection between the bottom and the surface are protected by the walls of the leg 4 makes it possible to eliminate the mechanical tensioning or "tensioning" of the conduits, an operation which is generally essential in the platforms of conventional operations.
- the oil platform comprises a square section leg through which pass connecting equipment between the bottom and the hull.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Description
La présente invention est relative aux plates-formes pétrolières et se rapporte plus particulièrement aux plates-formes auto-élévatrices de forage et d'exploitation en mer.The present invention relates to oil platforms and relates more particularly to self-elevating platforms for drilling and exploitation at sea.
Les plates-formes auto-élévatrices comportent en général une coque montée déplaçable sur des jambes qui prennent appui sur le fond marin, ladite coque supportant notamment un plancher de forage et une tour de forage appelée ci-après derrick.Self-elevating platforms generally comprise a hull mounted to move on legs which bear on the seabed, said hull in particular supporting a drilling floor and a drilling tower hereinafter called a derrick.
Parmi les plates-formes auto-élévatrices, on connait les plates-formes dont la coque présente une échancrure latérale permettant d'effectuer les travaux de forage et les opérations d'exploitation en plaçant le matériel de forage et/ou d'exploitation au-dessus de l'échancrure.Among the self-elevating platforms, platforms are known whose hull has a lateral notch making it possible to carry out drilling work and operating operations by placing the drilling and / or operating equipment at- above the notch.
On connaît également des plates-formes dites " Cantilever" dont les équipements de forage et d'exploitation sont disposés en porte-à-faux de façon à permettre de travailler "par dessus bord".Also known as "Cantilever" platforms, the drilling and operating equipment of which are cantilevered so as to allow work "overboard".
On a décrit dans la demande de brevet FR-A-2 594 459 publiée le 21 août 1987 par la Demanderesse, une plate-forme auto-élévatrice dont la coque est pourvue d'une ouverture centrale et dont la table de rotation est déplaçable au-dessus de ladite ouverture selon deux directions de coordonnées perpendiculaires.There has been described in patent application FR-A-2,594,459 published on August 21, 1987 by the Applicant, a self-elevating platform whose hull is provided with a central opening and whose rotation table is movable at above said opening in two directions of perpendicular coordinates.
La plate-forme de ce dernier type présente l'avantage de permettre à l'ensemble des équipements de liaison entre le socle sous-marin des puits au-dessus duquel elle est placée d'une part et la coque d'autre part de se trouver dans l'espace défini par les jambes de la plate-forme et d'être ainsi relativement bien protégés vis à vis des intempéries et des corps flottants.The platform of the latter type has the advantage of allowing all of the connection equipment between the underwater base of the wells above which it is placed on the one hand and the hull on the other hand to be find in the space defined by the legs of the platform and thus be relatively well protected against bad weather and floating bodies.
On connaît en outre d'après GB-A-2 139 570, une plate-forme pétroliere comprenant une coque supportée par des jambes porteuses disposées à la périphérie de la coque et une jambe définissant un espace dans lequel sont disposés des équipements de liaison entre le fond et la coque, ladite jambe définissant l'espace dans lequel sont disposés les équipements de liaison étant une jambe porteuse. Un plancher de forage est disposé sur la coque, déplaçable au-dessus de la section transversale de la jambe définissant l'espace de réception desdits équipements de liaison.We also know from GB-A-2 139 570, an oil platform comprising a hull supported by load-bearing legs disposed at the periphery of the hull and a leg defining a space in which connection equipment is arranged between the bottom and the shell, said leg defining the space in which the connecting equipment is arranged being a supporting leg. A drilling floor is disposed on the hull, movable above the cross section of the leg defining the space for receiving said connecting equipment.
Dans cette plate-forme, la jambe définissant l'espace de réception des équipements est une jambe centrale.In this platform, the leg defining the space for receiving the equipment is a central leg.
Avec un tel agencement, la plate-forme ne peut comporter moins de quatre jambes, ce qui augmente le coût de sa fabrication. En outre, une plate-forme du type précité qui comporte au moins quatre jambes prend appui sur le fond marin en au moins quatre zones correspondantes qui n'ont pas toutes nécessairement la même consistance. Il y a donc des risques pour que par exemple l'une des jambes périphériques de la plate-forme ait tendance à s'enfoncer alors que les autres jambes rencontrent un sol leur permettant d'avoir un appui franc. Il en résulte une certaine instabilité de la plate-forme.With such an arrangement, the platform cannot have less than four legs, which increases the cost of its manufacture. In addition, a platform of the aforementioned type which comprises at least four legs is supported on the seabed in at least four corresponding zones which do not necessarily all have the same consistency. There are therefore risks that, for example, one of the peripheral legs of the platform tends to sink while the other legs meet a ground allowing them to have a firm support. This results in a certain instability of the platform.
L'invention vise à créer une plate-forme pétrolière qui présente une bonne stabilité, qui soit d'un prix de revient relativement réduit et dont les équipements de liaison entre le fond et la coque soient protégés avec une efficacité encore accrue.The invention aims to create an oil platform which has good stability, which is of a relatively reduced cost price and whose connecting equipment between the bottom and the hull are protected with even greater efficiency.
L'invention vise également à créer une plate-forme permanente qui puisse permettre de remonter les têtes de puits en surface sans efforts de traction au niveau de la plate-forme.The invention also aims to create a permanent platform which can allow reassemble the well heads at the surface without tensile forces at the level of the platform.
Elle a donc pour objet une plate-forme pétrolière comprenant une coque supportée par des jambes porteuses prenant appui sur le fond marin et disposées à la périphérie de la coque et une jambe définissant un espace dans lequel sont disposés les équipements de liaison entre le fond et la coque, caractérisée en ce que la coque de la plate-forme est de forme générale triangulaire et montée déplaçable sur seulement trois jambes porteuses, la jambe définissant l'espace de réception desdits équipements de liaison étant l'une desdites jambes porteuses, et en ce qu'un plancher de forage est disposé sur la coque déplaçable au-dessus de la section transversale de la jambe définissant l'espace de réception desdits équipements de liaison.It therefore relates to an oil platform comprising a hull supported by load-bearing legs bearing on the seabed and arranged at the periphery of the hull and a leg defining a space in which the connection equipment between the bottom and the hull, characterized in that the hull of the platform is of generally triangular shape and mounted displaceable on only three carrying legs, the leg defining the space for receiving said connecting equipment being one of said carrying legs, and in that a drilling floor is disposed on the movable shell above the cross section of the leg defining the space for receiving said connecting equipment.
L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawings, in which:
- la Fig.1 est une vue schématique en élévation d'une plate-forme auto-élévatrice suivant l'invention; et- Fig.1 is a schematic elevational view of a self-elevating platform according to the invention; and
- la Fig.2 est une vue de dessus de la plate-forme de la Fig.1.- Fig.2 is a top view of the platform of Fig.1.
La plate-forme représentée à la Fig.1 est une plate-forme auto-élévatrice comprenant une coque 1 montée déplaçable sur des jambes 2,3, formées de montants tubulaires 4 réunis entre eux par des treillis de poutrelles métalliques 5. Les moyens de déplacement de la coque sur ses jambes sont constitués par des pignons entraînés par des moto-réducteurs montés sur la coque, les pignons coopérant avec des crémaillères portées par les jambes (non représenté).The platform shown in Fig.1 is a self-elevating platform comprising a shell 1 movable mounted on
Le verrouillage de la coque en position par rapport aux jambes est avantageusement assuré par des dispositifs du type décrit au brevet français FR-A-2560246.The locking of the shell in position relative to the legs is advantageously ensured by devices of the type described in French patent FR-A-2560246.
Les jambes 2, 3 prennent appui sur le fond par l'intermédiaire de rehausses respectives 6,7 de structure analogue à celle des jambes et immobilisées par rapport au fond par des pieux 8 fichés dans le sol du fond marin.The
Les rehausses 6,7 sont avantageusement du type décrit à la demande de brevet FR-A-2592075 au nom de la Demanderesse.The
Comme le montre la Fig.2, la plate-forme suivant l'invention est une plate-forme dont la coque 1 est de forme générale triangulaire. La coque 1 est montée déplaçable sur trois jambes dont deux jambes 2 sont de section triangulaire et dont la troisième jambe 3 est de section carrée plus importante que celle des jambes 2. La jambe 3 peut également être de section triangulaire. Sur la coque 1 et au-dessus de l'extrémité supérieure de la jambe 3 de section carrée est monté un plancher de forage 9 déplaçable sur des rails latéraux 10 portés par des piliers 11 fixés à la coque 1.As shown in Fig.2, the platform according to the invention is a platform whose shell 1 is of generally triangular shape. The shell 1 is mounted displaceable on three legs, two
Le plancher de forage 9 est également déplaçable sur une voie 12, perpendiculaire aux rails 11 ce qui permet au centre du plancher de forage d'occuper l'une quelconque des positions indiquées par les points 13 au-dessus de la section transversale de la jambe 3 de section carrée.The
Au plancher de forage 9 est associé un derrick 14 déplaçable avec ledit plancher.
Dans la jambe 3 de section carrée, sont disposés les matériels de liaison entre le fond marin et la coque.In the
Ces équipements sont représentés par des conduits 16 qui relient le plancher de forage 9 au fond marin et qui s'étendent dans l'espace ménagé à l'intérieur de la jambe 3 jusqu'à la rehausse 7 puis dans l'espace ménagé à l'intérieur de celle-ci.These pieces of equipment are represented by
Comme représenté en trait interrompu à la Fig.1, le plancher de forage 9 et le derrick 14 peuvent occuper une position dégageant la section transversale de la jambe 3 afin de permettre les déplacements de la coque 1 sur les jambes 2,3.As shown in broken lines in Fig.1, the
Grâce à un tel agencement, les matériels de liaison entre le fond et la coque de la plate-forme sont protégés de toute part par les parois formées par les montants 4 et les treillis de poutrelles métalliques 5, contre tous chocs de corps flottants.Thanks to such an arrangement, the connection materials between the bottom and the shell of the platform are protected on all sides by the walls formed by the
Par ailleurs, étant donné que le plancher de forage se trouve à l'aplomb de la jambe 4, toute opération en porte-à-faux à partir de la plate-forme est évitée.Furthermore, since the drilling floor is located directly above the
La section transversale de la jambe 4 de plus forte section correspond avantageusement aux dimensions du socle sous-marin ou "template" d'un puits ou d'un ensemble de puits, les points 15 représentant les positions que peut occuper le centre du plancher de forage de la jambe 4, à l'aplomb de vannes correspondantes non représentées du socle sous-marin.The cross section of the
Selon un mode de réalisation avantageux, la rehausse 7 qui soutient la jambe 4 contenant les conduits de liaison 16 constitue en fait le socle sous-marin ou template.According to an advantageous embodiment, the
Un tel agencement présente en outre l'avantage de permettre d'assurer en toute sécurité les opérations de "completion" qui sont les opérations d'équipement de la partie souterraine du puits après les opérations de forage.Such an arrangement also has the advantage to allow to ensure in complete safety the operations of "completion" which are the operations of equipment of the underground part of the well after the drilling operations.
Le fait que les conduits 16 de liaison entre le fond et la surface sont protégés par les parois de la jambe 4 permet de supprimer la mise sous tension mécanique ou "tensionnement" des conduits, opération qui est généralement indispensable dans les plates-formes d'exploitation classiques.The fact that the
Dans le mode de réalisation décrit en référence aux dessins la plate-forme pétrolière comporte une jambe de section carrée dans laquelle passent des équipements de liaison entre le fond et la coque.In the embodiment described with reference to the drawings, the oil platform comprises a square section leg through which pass connecting equipment between the bottom and the hull.
Il est également possible de réaliser une plate-forme dont plusieurs jambes assurent le guidage et la protection de tels équipements.It is also possible to make a platform with several legs for guiding and protecting such equipment.
Claims (5)
- Oil platform comprising a shell (1) supported by support legs (3) resting on the sea bed and disposed on the periphery of the shell (1) and a leg (3) defining a space in which is disposed the equipment (16) for connection between the sea bed and the shell (1), characterised in that the shell of the platform is of general triangular shape and mounted to move solely on three support legs (2, 3), the leg (3) defining the space receiving said connection equipment being one of said support legs (2, 3), and in that a drilling deck (9) is disposed on the shell (1), which is able to move above the cross-section of the leg (3) defining the space for receiving said connection equipment.
- Platform according to Claim 1, characterised in that at least one other support leg defines a space for receiving connection equipment.
- Oil platform according to one of Claims 1 and 2, characterised in that the leg or legs (3) defining a space in which is housed the equipment (16) for connection between the sea bed and the shell (1) has/have a cross-section greater than that of the other legs (2) of the platform.
- Oil platform according to Claim 3, characterised in that the leg or legs (3) of greater cross-section has/have a square cross-section.
- Oil platform according to one of Claims 3 and 4, whereof the legs (2, 3) are supported by raising members (6, 7) immobilised with respect to the sea bed, characterised in that the raising member or members (7) supporting the leg or legs (3) of greater cross-section constitute as many underwater bases of at least one well to be exploited.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8610098 | 1986-07-10 | ||
| FR8610098A FR2601396B1 (en) | 1986-07-10 | 1986-07-10 | IMPROVED OIL PLATFORM FOR DRILLING AND EXPLOITATION AT SEA. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0252840A1 EP0252840A1 (en) | 1988-01-13 |
| EP0252840B1 true EP0252840B1 (en) | 1991-04-03 |
Family
ID=9337322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87401597A Expired - Lifetime EP0252840B1 (en) | 1986-07-10 | 1987-07-07 | Oil plattform for drilling and operating at sea |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0252840B1 (en) |
| FR (1) | FR2601396B1 (en) |
| NO (1) | NO872844L (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1470530A (en) * | 1965-03-02 | 1967-02-24 | Bethlehem Steel Corp | Device for positioning a derrick |
| US3881549A (en) * | 1973-04-27 | 1975-05-06 | Interseas Associates | Production and flare caisson system |
| US4249619A (en) * | 1979-06-04 | 1981-02-10 | Texaco Development Corporation | Deviated drilling apparatus |
| IT1131620B (en) * | 1980-06-20 | 1986-06-25 | Guido Santi Giunio | PLATFORM FOR CULTIVATION OF HYDROCARBONS AT A MINIMUM CONSTRUCTION AND ASSEMBLY TIME |
| GB2139570B (en) * | 1983-04-28 | 1986-08-28 | George Collingwood Copson | Jack-up rig |
-
1986
- 1986-07-10 FR FR8610098A patent/FR2601396B1/en not_active Expired - Lifetime
-
1987
- 1987-07-07 EP EP87401597A patent/EP0252840B1/en not_active Expired - Lifetime
- 1987-07-08 NO NO872844A patent/NO872844L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0252840A1 (en) | 1988-01-13 |
| NO872844D0 (en) | 1987-07-08 |
| NO872844L (en) | 1988-01-11 |
| FR2601396A1 (en) | 1988-01-15 |
| FR2601396B1 (en) | 1990-01-05 |
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