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EP2204497B1 - Method for installing a floatable offshore facility and offshore facility - Google Patents

Method for installing a floatable offshore facility and offshore facility Download PDF

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Publication number
EP2204497B1
EP2204497B1 EP08020928A EP08020928A EP2204497B1 EP 2204497 B1 EP2204497 B1 EP 2204497B1 EP 08020928 A EP08020928 A EP 08020928A EP 08020928 A EP08020928 A EP 08020928A EP 2204497 B1 EP2204497 B1 EP 2204497B1
Authority
EP
European Patent Office
Prior art keywords
platform
guide means
support structure
arrangement according
supports
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.)
Not-in-force
Application number
EP08020928A
Other languages
German (de)
French (fr)
Other versions
EP2204497A1 (en
Inventor
Andreas Rosponi
Alexander Krug
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tractebel Overdick GmbH
Original Assignee
Overdick GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Overdick GmbH and Co KG filed Critical Overdick GmbH and Co KG
Priority to AT08020928T priority Critical patent/ATE542958T1/en
Priority to DK08020928.1T priority patent/DK2204497T3/en
Priority to EP08020928A priority patent/EP2204497B1/en
Publication of EP2204497A1 publication Critical patent/EP2204497A1/en
Application granted granted Critical
Publication of EP2204497B1 publication Critical patent/EP2204497B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E02B2017/0039—Methods for placing the offshore structure
    • 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
    • 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
    • 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
    • E02B2017/0078—Suction piles, suction cans

Definitions

  • the invention relates to a method for installing a buoyant offshore arrangement according to claim 1 and to an offshore arrangement according to claim 2.
  • Such offshore arrangements serve, for example, to open up oil or gas deposits under the seabed. Further, they serve to bring down a pipe for conveying oil or gas from the Seabed.
  • ie drill pipe and drill pipes and the like guide tubes are provided, which are built from above the sea level to the seabed. In order to guide and also to hold such guide and protective tubes in a suitable manner, it is known to attach laterally corresponding guide means to the offshore arrangement.
  • the invention has for its object to provide an offshore arrangement and a method for installing a buoyant offshore arrangement, wherein the guide means during installation can be brought into position in a simple manner.
  • the support of lower and upper guide means for the guide and protective tubes or riser pipes is made by the supporting structure.
  • the support structure is usually a latticework on which the vertical supports are mounted.
  • the support of the upper guide means which are carried out separately from the lower guide means, taken from the platform.
  • the upper guide means are held by the platform as soon as they reach the area of the platform.
  • the upper guide means remain supported on the platform when they are is raised above the sea level.
  • the foundation of the support structure on the seabed can be done in a known manner, for. B. by means of a concrete foundation or suction cups or the like.
  • the lower guide means are firmly connected to the support structure.
  • the upper guide means are separably supported on the support structure and may extend upwardly from the support structure as the support structure is lowered towards the platform towards the seabed.
  • the platform has holding means which support the upper guide means when the support structure has been lowered from the platform by a predetermined distance.
  • the guide and protective tubes and risers on the guide means are more or less obligatory to provide guiding means in the area of the platform.
  • these guide means must not be connected to the platform from the outset, but they are initially supported more or less loosely on the support structure before the final installation of the arrangement.
  • the upper guide means are limited to the side and can not swim away. However, they are able to be raised relative to the support structure without further notice.
  • the platform can laterally receiving slots or channels have, in which sliders of the upper guide means engage until they abut against a stop.
  • the guide means can be fixed by means of suitable fastening means on the platform.
  • suitable fastening means on the platform.
  • Other constructive means are also conceivable for "catching" the upper guide means from the platform during the lowering operation and fixing the upper guide means to the platform, eg by means of a hook and flange connection.
  • the upper guide means are preferably arranged in a frame.
  • the frame may in turn be a latticework in which the guide means are mounted as guide rings or the like.
  • the supports of the frame can invest according to a further embodiment of the invention laterally against the associated side surface of the platform in order to obtain a sufficient lateral stabilization on the platform.
  • At least one rail pair for a rail vehicle is mounted on the platform and the guide means comprise at least a pair of rail sections aligned with the rails on the platform when the upper guide means are connected to the platform.
  • the rail vehicle is used, for example, for the transport of pipes, which are aligned with the aid of the rail vehicle to the guide means before the tubes are lowered.
  • FIGS. 1 to 7 an offshore arrangement 10 is shown, which is briefly described by Fig. 1 should be explained. It consists of a support structure 12, which represents a stable latticework. At the corners of the approximately rectangular support structure 12 four vertical supports 14 are mounted, which are connected at the lower end with suction cups 16. The suction cups 16 are used for anchoring the supports 14 in the seabed. They are more or less driven by vacuum into the seabed. Such suction cups are known per se.
  • a buoyant platform 18 is arranged between the vertical supports 14 . It can be fixed at any height on the supports, it can also slide for the purpose of height adjustment on the vertical supports 14. In the area of a corner of the platform 18, a column 20 for a crane 22 is arranged on this. In addition, on the top of rails 24, a vehicle 26 is arranged with a vertical frame 28a for a pipe string, which can be lowered from the platform 18 towards the seabed.
  • a frame consisting of a lattice between two adjacent columns 14 is supported on the corresponding edge of the support structure 12.
  • the frame 28 is arranged outside the outer contour of the platform 18.
  • the frame 28 has in three height-spaced planes 30, 32, 34 with guide openings for guide and protective tubes, not shown.
  • the guide openings are formed, for example, by bushings, which are arranged in the planes 30 to 34.
  • the sockets are not shown.
  • the support structure 12 holds further guide means with guide openings (not shown), wherein the guide openings are aligned with the guide openings of the frame 28.
  • Fig. 1 The offshore arrangement according to Fig. 1 is assembled in a suitable location and allowed to water. Of course, this can also be done with the help of floating docks or the like.
  • Fig. 2 shows the floating of the assembly 10, wherein the water level is indicated at 36. The buoyancy of the assembly 10 is produced by the platform 18. With the help of a suitable Glasschiffes the assembly 10 is pulled to a desired location.
  • Fig. 3 shows the beginning of the installation at the desired location. For this purpose, the support structure 12 is lowered relative to the platform 18, as indicated by arrow 38. The funds required for this purpose are not shown.
  • Fig. 4 It is shown how the support structure 12 is completely lowered on a seabed 40. It can be seen that during this lowering process the frame 28 remains hanging on the platform 18, thus lifting itself from the support structure 12, when the frame 28 in the lowering process according to Fig. 3 has a height in which holding means of the platform 18, not shown hold the frame 28 so that its upper surface is approximately aligned with the top of the platform 18.
  • Fig. 6 is shown as the suction cups 16 are driven in the seabed and fixed there. In addition, it is shown how the platform 18 is raised above the water level 36 and thereby took the frame 28.
  • Fig. 6 shows the final installation of the assembly 10, wherein the platform 18 is pushed to the upper end of the vertical supports 14 and fixed thereto. Again, the frame 28 is taken.
  • Fig. 7 On the platform 18 are rail pairs 42 on which the vehicle 26 can be moved. On top of the frame 28 are also, as shown at 44, rail portions 44, which are aligned with the rails 42.
  • the vehicle 26 can therefore, as in Fig. 7 is shown, at least partially driven on the frame 28.
  • guide tubes can now be brought down or riser pipes are installed, as at 46 in Fig. 7 shown.
  • the guide tubes 46 can be guided by the already mentioned guides in the levels 30 to 34 in the frame 28 and by lower guide means in the support structure 12.
  • the guide or protective tubes are used, for example to guide and protect drill pipes that are driven into the seabed during the drilling process.
  • FIG. 8 - 13 the interconnectable parts of platform 18 and upper guide means 28 are shown in more detail. However, only details which form a connecting structure between these parts will be described below. The remaining parts are not explained because they have nothing to do with the subject invention.
  • a hook portion 50 and on the side facing the platform 18 has a recess 52, in which the hook portion 40 can be hooked.
  • the recess 52 narrows down so that an easier insertion into the recess 52 is made possible.
  • Below and to the side of the recess guide plates 54 are provided with a conical insertion section. They serve to guide the hook portion 50 when inserted into the recess 52.
  • a projection 56 is provided with a vertical, planar counter surface 58, which cooperates with a contact surface 60 at the top of the platform 18, if, as in Fig. 9 is shown, the hook portion 50 is inserted into the recess 52.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Artificial Fish Reefs (AREA)
  • Foundations (AREA)
  • Earth Drilling (AREA)

Abstract

The method involves lifting a platform (18) to a preset height above a mean sea level, and fixing the platform to vertical supports (14). A lower guiding unit and an upper guiding unit (28) for guide and support pipes are supported on a support construction (12) i.e. lattice work, during transport of an offshore arrangement (10) and lowering stroke of the construction. The upper guiding unit is supported by the platform via a holding unit, after preset lowering stroke of the construction, when the guiding units reach a height of the platform during lowering of the construction. An independent claim is also included for an offshore arrangement comprising a support construction.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Installation einer schwimmfähigen Offshore-Anordnung nach Anspruch 1 und auf eine Offshore-Anordnung nach Patentanspruch 2.The invention relates to a method for installing a buoyant offshore arrangement according to claim 1 and to an offshore arrangement according to claim 2.

Aus EP 1 068 403 ist eine Offshore-Anordnung bekannt geworden, die schwimmfähig ist. Sie weist eine Stützkonstruktion auf, an der drei oder vier vertikale Stützen seitlich angebracht sind. Am unteren Ende der Stützen sind Saugtöpfe angebracht, um die Stützen mit Hilfe von Unterdruck im Meeresboden festzusetzen. Zwischen den Stützen befindet sich eine Plattform, die an den Stützen beweglich geführt ist und zwischen einer ersten Stellung, in der sie annähernd im Bereich der Saugtöpfe liegt und einer dazu beabstandeten zweiten Stellung lösbar mit den Stützen verbunden ist. Die beschriebene Anordnung ist schwimmfähig, so dass die Anordnung, sobald sie an Land fertig gestellt ist, schwimmend zu einem gewünschten Ort bewegt bzw. gezogen werden kann. Am Aufstellort wird die Stützkonstruktion abgesenkt, bis die Saugtöpfe auf dem Meeresboden aufstehen. Danach werden die Saugtöpfe im Boden festgesetzt, wobei zu diesem Zeitpunkt die Plattform aufschwimmt. Nach dem Festsetzen der Stützen wird die Plattform gegenüber dem Meeresspiegel angehoben. Es ist auch bekannt, die Plattform selbst als Schwimmkörper auszubilden, um die Offshore-Anordnung schwimmend zu einem gewünschten Ort zu bringen.Out EP 1 068 403 has become known an offshore arrangement that is buoyant. It has a support structure on which three or four vertical supports are mounted laterally. Suction cups are attached to the lower end of the columns to fix the columns in the seabed by means of negative pressure. Between the supports there is a platform, which is movably guided on the supports and between a first position in which it is approximately in the region of the suction cups and a second position spaced therefrom, releasably connected to the supports. The arrangement described is buoyant, so that the arrangement, once completed on land, can be moved or pulled floating to a desired location. At the installation site, the support structure is lowered until the suction cups stand up on the seabed. Thereafter, the suction cups are fixed in the ground, at which time the platform floats. After setting the supports, the platform is raised from the sea level. It is also known to form the platform itself as a float to float the offshore arrangement to a desired location.

Derartige Offshore-Anordnungen dienen zum Beispiel zum Erschließen von Öl- oder Gasvorkommen unter dem Meeresboden. Ferner dienen sie zum Herunterbringen einer Leitung zum Fördern von Öl oder Gas aus dem Meeresboden. Zum Schutz derartiger Maßnahmen, d.h. von Bohrgestänge und Bohrrohren und dergleichen sind Führungsrohre vorgesehen, die von oberhalb des Meeresspiegels bis zum Meeresboden errichtet werden. Um derartige Führungs- und Schutzrohre in geeigneter Weise zu führen und auch zu halten, ist bekannt, an der Offshore-Anordnung seitlich entsprechende Führungsmittel anzubringen.Such offshore arrangements serve, for example, to open up oil or gas deposits under the seabed. Further, they serve to bring down a pipe for conveying oil or gas from the Seabed. To protect such measures, ie drill pipe and drill pipes and the like guide tubes are provided, which are built from above the sea level to the seabed. In order to guide and also to hold such guide and protective tubes in a suitable manner, it is known to attach laterally corresponding guide means to the offshore arrangement.

Aus US 3,797,256 sind eine Offshore-Bohrplattform und ein Verfahren zur Errichtung einer solchen Offshore-Bohrplattform bekannt. Durch ein teleskopartiges Aufbauen der Plattform aus oberen vertikalen Stützbeinen und unteren vertikalen Stützbeinen soll diese auch für große Wassertiefen geeignet sein. Am unteren Ende der oberen vertikalen Stützbeine ist eine Führungsstruktur vorgesehen, die die unteren vertikalen Stützbeine führt. Seitlich fest mit der schwimmfähigen Plattform verbunden ist ein Ölbohrturm, durch den eine Ölbohreinrichtung von der Plattform zum Meeresboden geführt werden kann. Die Ölbohreinrichtung wird dabei ebenfalls durch die an den unteren Enden der oberen vertikalen Stützbeine vorgesehene Führungsstruktur geführt.Out US 3,797,256 are known an offshore drilling platform and a method of constructing such an offshore drilling platform. By telescoping the platform of upper vertical support legs and lower vertical support legs this should also be suitable for large water depths. At the lower end of the upper vertical support legs, a guide structure is provided which guides the lower vertical support legs. Securely connected to the buoyant platform is an oil rig, through which an oil rig can be directed from the platform to the seabed. The oil drilling device is also guided by the provided at the lower ends of the upper vertical support legs guide structure.

Der Erfindung liegt die Aufgabe zugrunde, eine Offshore-Anordnung und ein Verfahren zur Installation einer schwimmfähigen Offshore-Anordnung vorzusehen, wobei auch die Führungsmittel während der Installation auf einfache Weise in Stellung gebracht werden können.The invention has for its object to provide an offshore arrangement and a method for installing a buoyant offshore arrangement, wherein the guide means during installation can be brought into position in a simple manner.

Diese Aufgabe wird durch die Merkmale der Patentansprüche 1 und 2 gelöst.This object is solved by the features of claims 1 and 2.

Bei dem erfindungsgemäßen Verfahren wird während des Transports der Offshore-Anordnung und eines ersten Absenkhubs der Stützkonstruktion die Abstützung unterer und oberer Führungsmittel für die Führungs- und Schutzrohre bzw. Steigrohre von der Stützkonstruktion vorgenommen. Die Stützkonstruktion ist üblicherweise ein Gitterwerk, an dem auch die vertikalen Stützen angebracht sind. Während des Absenkvorgangs der Stützkonstruktion wird die Abstützung der oberen Führungsmittel, welche von den unteren Führungsmitteln getrennt ausgeführt sind, von der Plattform übernommen. Während die unteren Führungsmittel mit der Stützkonstruktion in Richtung Meeresboden abgesenkt werden, werden die oberen Führungsmittel von der Plattform gehalten, sobald diese den Bereich der Plattform erreichen. Die oberen Führungsmittel bleiben an der Plattform weiter abgestützt, wenn diese über dem Meeresspiegel angehoben wird. Die Fundamentierung der Stützkonstruktion auf dem Meeresgrund kann in bekannter Weise erfolgen, z. B. mittels eines Betonfundaments oder Saugtöpfen oder dergleichen.In the method according to the invention, during the transport of the offshore arrangement and a first lowering stroke of the supporting structure, the support of lower and upper guide means for the guide and protective tubes or riser pipes is made by the supporting structure. The support structure is usually a latticework on which the vertical supports are mounted. During the lowering of the support structure, the support of the upper guide means, which are carried out separately from the lower guide means, taken from the platform. While the lower guide means are lowered with the support structure towards the seabed, the upper guide means are held by the platform as soon as they reach the area of the platform. The upper guide means remain supported on the platform when they are is raised above the sea level. The foundation of the support structure on the seabed can be done in a known manner, for. B. by means of a concrete foundation or suction cups or the like.

Bei der erfindungsgemäßen Offshore-Anordnung sind die unteren Führungsmittel mit der Stützkonstruktion fest verbunden. Die oberen Führungsmittel stützen sich trennbar an der Stützkonstruktion ab und können sich gegenüber der Stützkonstruktion nach oben entfernen, wenn die Stützkonstruktion gegenüber der Plattform in Richtung Meeresboden abgesenkt wird. Die Plattform weist Haltemittel auf, welche die oberen Führungsmittel abstützen, wenn die Stützkonstruktion gegenüber der Plattform um eine vorgegebene Strecke abgesenkt worden ist.In the offshore arrangement according to the invention, the lower guide means are firmly connected to the support structure. The upper guide means are separably supported on the support structure and may extend upwardly from the support structure as the support structure is lowered towards the platform towards the seabed. The platform has holding means which support the upper guide means when the support structure has been lowered from the platform by a predetermined distance.

Für das Einbringen der Führungs- und Schutzrohre sowie Steigrohre über die Führungsmittel sind mehr oder weniger obligatorisch, Führungsmittel auch im Bereich der Plattform vorzusehen. Bei der Erfindung müssen jedoch diese Führungsmittel nicht von vornherein mit der Plattform verbunden werden, vielmehr sind diese vor der endgültigen Installation der Anordnung zunächst mehr oder weniger lose auf der Stützkonstruktion abgestützt. Es versteht sich, dass die oberen Führungsmittel zur Seite hin begrenzt sind und nicht fort schwimmen können. Sie sind jedoch in der Lage, gegenüber der Stützkonstruktion ohne weiteres angehoben zu werden. Beim Absenken der Stützkonstruktion erfolgt eine Mitnahme an der Plattform. Auf diese Weise sind die oberen Führungsmittel mehr oder weniger automatisch mit der Plattform verbunden, wenn die Offshore-Anordnung installiert wird. Nach einer Ausgestaltung der Erfindung kann die Plattform seitlich Aufnahmeschlitze oder -kanäle aufweisen, in welche Gleitstücke der oberen Führungsmittel eingreifen, bis sie gegen einen Anschlag anstoßen. In dieser Position können die Führungsmittel mit Hilfe von geeigneten Befestigungsmitteln an der Plattform festgelegt werden. Es sind auch andere konstruktive Mittel denkbar, während des Absenkvorgangs die oberen Führungsmittel von der Plattform "aufzufangen" und die oberen Führungsmittel an der Plattform zu fixieren, z.B. durch eine Haken- und Flanschverbindung.For the introduction of the guide and protective tubes and risers on the guide means are more or less obligatory to provide guiding means in the area of the platform. In the invention, however, these guide means must not be connected to the platform from the outset, but they are initially supported more or less loosely on the support structure before the final installation of the arrangement. It is understood that the upper guide means are limited to the side and can not swim away. However, they are able to be raised relative to the support structure without further notice. When lowering the support structure is carried on the platform. In this way, the upper guide means are more or less automatically connected to the platform when the offshore assembly is installed. According to one embodiment of the invention, the platform can laterally receiving slots or channels have, in which sliders of the upper guide means engage until they abut against a stop. In this position, the guide means can be fixed by means of suitable fastening means on the platform. Other constructive means are also conceivable for "catching" the upper guide means from the platform during the lowering operation and fixing the upper guide means to the platform, eg by means of a hook and flange connection.

Nach einer Ausgestaltung der Erfindung sind die oberen Führungsmittel vorzugsweise in einem Gestell angeordnet. Das Gestell kann wiederum ein Gitterwerk sein, in dem die Führungsmittel als Führungsringe oder dergleichen angebracht sind.According to one embodiment of the invention, the upper guide means are preferably arranged in a frame. The frame may in turn be a latticework in which the guide means are mounted as guide rings or the like.

Die Stützen des Gestells können sich nach einer weiteren Ausgestaltung der Erfindung seitlich gegen die zugeordnete Seitenfläche der Plattform anlegen, um eine ausreichende seitliche Stabilisierung an der Plattform zu erhalten.The supports of the frame can invest according to a further embodiment of the invention laterally against the associated side surface of the platform in order to obtain a sufficient lateral stabilization on the platform.

Nach einer weiteren Ausgestaltung der Erfindung ist auf der Plattform mindestens ein Schienenpaar für ein Schienenfahrzeug angebracht und die Führungsmittel weisen mindestens ein Paar Schienenabschnitte auf, die mit den Schienen auf der Plattform ausgerichtet sind, wenn die oberen Führungsmittel mit der Plattform verbunden sind. Das Schienenfahrzeug dient z.B. zum Transport von Rohren, die mit Hilfe des Schienenfahrzeugs zu den Führungsmitteln ausgerichtet werden, bevor die Rohre abgesenkt werden.According to a further embodiment of the invention, at least one rail pair for a rail vehicle is mounted on the platform and the guide means comprise at least a pair of rail sections aligned with the rails on the platform when the upper guide means are connected to the platform. The rail vehicle is used, for example, for the transport of pipes, which are aligned with the aid of the rail vehicle to the guide means before the tubes are lowered.

Die Erfindung soll nachfolgend anhand von Zeichnungen näher beschrieben werden.

Fig. 1
zeigt perspektivisch schematisch eine Anordnung nach der Erfindung.
Fig. 2
zeigt die Anordnung nach Fig. 1 während des Transports auf dem Wasser.
Fig. 3
zeigt die Absenkung der Stützkonstruktion der Anordnung nach Fig. 1 in Richtung Meeresgrund.
Fig. 4
zeigt die Verankerung der Offshore-Anordnung am Meeresgrund.
Fig. 5
zeigt die Anordnung nach Fig. 4 mit über dem Meeresspiegel ange- hobener Plattform.
Fig. 6
zeigt die endgültige Position der Plattform bei der erfindungsgemäßen Anordnung.
Fig. 7
zeigt die Anordnung eines Führungs- und Schutzrohres in erfindungs- gemäßen Führungsmitteln in der erfindungsgemäßen Anordnung.
Fig. 8
zeigt perspektivisch den Verbindungsbereich zwischen oberen Füh- rungsmitteln und Plattform vor der Montage.
Fig. 9 zeigt
die Verbindung von oberen Führungsmitteln mit einer Plattform.
Fig. 10 - 13
zeigen abweichende Ausführungsformen einer Verbindung zwischen oberen Führungsmitteln und Plattform in auseinander- liegender und zusammengebauter Position.
The invention will be described below with reference to drawings.
Fig. 1
shows a perspective view schematically an arrangement according to the invention.
Fig. 2
shows the arrangement after Fig. 1 during transport on the water.
Fig. 3
shows the lowering of the support structure of the arrangement Fig. 1 towards the seabed.
Fig. 4
shows the anchoring of the offshore arrangement on the seabed.
Fig. 5
shows the arrangement after Fig. 4 with platform raised above sea level.
Fig. 6
shows the final position of the platform in the inventive arrangement.
Fig. 7
shows the arrangement of a guide and protective tube in inventive guide means in the inventive arrangement.
Fig. 8
shows in perspective the connection area between upper guide means and platform before assembly.
Fig. 9 shows
the connection of upper guide means with a platform.
Fig. 10 - 13
show different embodiments of a connection between upper guide means and platform in disassembled and assembled position.

In den Figuren 1 bis 7 ist eine Offshore-Anordnung 10 dargestellt, welche kurz anhand von Fig. 1 erläutert werden soll. Sie besteht aus einer Stützkonstruktion 12, die ein stabiles Gitterwerk darstellt. An den Ecken der annähernd rechteckigen Stützkonstruktion 12 sind vier vertikale Stützen 14 angebracht, die am unteren Ende mit Saugtöpfen 16 verbunden sind. Die Saugtöpfe 16 dienen zum Verankern der Stützen 14 im Meeresboden. Sie werden über Vakuum in den Meeresboden mehr oder weniger weit eingetrieben. Derartige Saugtöpfe sind an sich bekannt.In the FIGS. 1 to 7 an offshore arrangement 10 is shown, which is briefly described by Fig. 1 should be explained. It consists of a support structure 12, which represents a stable latticework. At the corners of the approximately rectangular support structure 12 four vertical supports 14 are mounted, which are connected at the lower end with suction cups 16. The suction cups 16 are used for anchoring the supports 14 in the seabed. They are more or less driven by vacuum into the seabed. Such suction cups are known per se.

Zwischen den vertikalen Stützen 14 ist eine schwimmfähige Plattform 18 angeordnet. Sie kann in beliebiger Höhe an den Stützen festgelegt werden, sie kann auch zwecks Höhenverstellung an den vertikalen Stützen 14 gleiten. Im Bereich einer Ecke der Plattform 18 ist auf dieser eine Säule 20 für einen Kran 22 angeordnet. Außerdem ist auf der Oberseite auf Schienen 24 ein Fahrzeug 26 angeordnet mit einem vertikalen Gerüst 28a für ein Rohrgestänge, das von der Plattform 18 aus in Richtung Meeresboden abgesenkt werden kann.Between the vertical supports 14 a buoyant platform 18 is arranged. It can be fixed at any height on the supports, it can also slide for the purpose of height adjustment on the vertical supports 14. In the area of a corner of the platform 18, a column 20 for a crane 22 is arranged on this. In addition, on the top of rails 24, a vehicle 26 is arranged with a vertical frame 28a for a pipe string, which can be lowered from the platform 18 towards the seabed.

Wie ferner in Fig. 1 zu erkennen, ist ein aus einem Gitterwerk bestehendes Gestell zwischen zwei benachbarten Stützen 14 auf der entsprechenden Kante der Stützkonstruktion 12 abgestützt. Das Gestell 28 ist außerhalb der Außenkontur der Plattform 18 angeordnet. Das Gestell 28 weist in drei in der Höhe beabstandeten Ebenen 30, 32, 34 mit Führungsöffnungen für nicht gezeigte Führungs- und Schutzrohre auf. Die Führungsöffnungen werden zum Beispiel von Buchsen gebildet, die in den Ebenen 30 bis 34 angeordnet sind. Die Buchsen sind nicht gezeigt.As further in Fig. 1 To recognize, a frame consisting of a lattice between two adjacent columns 14 is supported on the corresponding edge of the support structure 12. The frame 28 is arranged outside the outer contour of the platform 18. The frame 28 has in three height-spaced planes 30, 32, 34 with guide openings for guide and protective tubes, not shown. The guide openings are formed, for example, by bushings, which are arranged in the planes 30 to 34. The sockets are not shown.

Unterhalb des Gestells 30 hält die Stützkonstruktion 12 weitere Führungsmittel mit Führungsöffnungen (nicht gezeigt), wobei die Führungsöffnungen zu den Führungsöffnungen des Gestells 28 ausgerichtet sind.Below the frame 30, the support structure 12 holds further guide means with guide openings (not shown), wherein the guide openings are aligned with the guide openings of the frame 28.

Die Offshore-Anordnung gemäß Fig. 1 wird an einem geeigneten Ort zusammengebaut und zu Wasser gelassen. Dies kann natürlich auch mit Hilfe von Schwimmdocks oder dergleichen geschehen. Fig. 2 zeigt das Aufschwimmen der Anordnung 10, wobei der Wasserspiegel bei 36 angedeutet ist. Die Schwimmfähigkeit der Anordnung 10 wird durch die Plattform 18 hergestellt. Mit Hilfe eines geeigneten Zugschiffes wird die Anordnung 10 zu einem gewünschten Ort gezogen. Fig. 3 zeigt den Beginn der Installation am gewünschten Ort. Zu diesem Zwecke wird die Stützkonstruktion 12 gegenüber der Plattform 18 abgesenkt, wie durch Pfeil 38 angedeutet. Die hierfür erforderlichen Mittel sind nicht dargestellt.The offshore arrangement according to Fig. 1 is assembled in a suitable location and allowed to water. Of course, this can also be done with the help of floating docks or the like. Fig. 2 shows the floating of the assembly 10, wherein the water level is indicated at 36. The buoyancy of the assembly 10 is produced by the platform 18. With the help of a suitable Zugschiffes the assembly 10 is pulled to a desired location. Fig. 3 shows the beginning of the installation at the desired location. For this purpose, the support structure 12 is lowered relative to the platform 18, as indicated by arrow 38. The funds required for this purpose are not shown.

In Fig. 4 ist dargestellt, wie die Stützkonstruktion 12 vollständig auf einem Meeresboden 40 abgesenkt ist. Man erkennt, dass bei diesem Absenkvorgang das Gestell 28 an der Plattform 18 hängen bleibt, sich mithin von der Stützkonstruktion 12 abhebt, wenn das Gestell 28 beim Absenkvorgang gemäß Fig. 3 eine Höhe hat, in der nicht weiter dargestellte Haltemittel der Plattform 18 das Gestell 28 halten, so dass seine Oberseite annähernd mit der Oberseite der Plattform 18 fluchtet.In Fig. 4 It is shown how the support structure 12 is completely lowered on a seabed 40. It can be seen that during this lowering process the frame 28 remains hanging on the platform 18, thus lifting itself from the support structure 12, when the frame 28 in the lowering process according to Fig. 3 has a height in which holding means of the platform 18, not shown hold the frame 28 so that its upper surface is approximately aligned with the top of the platform 18.

In Fig. 6 ist dargestellt, wie die Saugtöpfe 16 im Meeresboden eingetrieben und dort festgelegt sind. Außerdem ist gezeigt, wie die Plattform 18 oberhalb des Wasserspiegels 36 angehoben ist und dabei das Gestell 28 mitgenommen hat.In Fig. 6 is shown as the suction cups 16 are driven in the seabed and fixed there. In addition, it is shown how the platform 18 is raised above the water level 36 and thereby took the frame 28.

Fig. 6 zeigt die endgültige Installation der Anordnung 10, wobei die Plattform 18 bis zum oberen Ende der vertikalen Stützen 14 geschoben und an diesen festgelegt ist. Auch hierbei wird das Gestell 28 mitgenommen. Fig. 6 shows the final installation of the assembly 10, wherein the platform 18 is pushed to the upper end of the vertical supports 14 and fixed thereto. Again, the frame 28 is taken.

Auf der Plattform 18 befinden sich Schienenpaare 42, auf denen das Fahrzeug 26 bewegt werden kann. Auf der Oberseite des Gestells 28 befinden sich ebenfalls, wie bei 44 dargestellt, Schienenabschnitte 44, die mit den Schienen 42 ausgerichtet sind. Das Fahrzeug 26 kann daher, wie dies in Fig. 7 dargestellt ist, zumindest teilweise auf das Gestell 28 gefahren werden. Mit Hilfe des Gerüstes 28a am Fahrzeug 26 können nun Führungsrohre heruntergebracht bzw. Steigrohre installiert werden, wie bei 46 in Fig. 7 dargestellt. Die Führungsrohre 46 können durch die bereits erwähnten Führungen in den Ebenen 30 bis 34 im Gestell 28 und durch untere Führungsmittel in der Stützkonstruktion 12 geführt werden. Die Führungs- oder Schutzrohre dienen z.B. dazu, Bohrrohre zu führen und zu schützen, die während des Bohrprozesses in den Meeresboden eingetrieben werden.On the platform 18 are rail pairs 42 on which the vehicle 26 can be moved. On top of the frame 28 are also, as shown at 44, rail portions 44, which are aligned with the rails 42. The vehicle 26 can therefore, as in Fig. 7 is shown, at least partially driven on the frame 28. With the help of the frame 28a on the vehicle 26 guide tubes can now be brought down or riser pipes are installed, as at 46 in Fig. 7 shown. The guide tubes 46 can be guided by the already mentioned guides in the levels 30 to 34 in the frame 28 and by lower guide means in the support structure 12. The guide or protective tubes are used, for example to guide and protect drill pipes that are driven into the seabed during the drilling process.

In den Fig. 8 - 13 sind die miteinander verbindbaren Teile von Plattform 18 und oberen Führungsmitteln 28 näher dargestellt. Es werden nachstehend jedoch nur diejenigen Einzelheiten näher beschrieben, welche eine Verbindungskonstruktion zwischen diesen Teilen bilden. Die übrigen Teile werden nicht erläutert, da sie mit dem Gegenstand der Erfindung nichts zu tun haben.In the Fig. 8 - 13 the interconnectable parts of platform 18 and upper guide means 28 are shown in more detail. However, only details which form a connecting structure between these parts will be described below. The remaining parts are not explained because they have nothing to do with the subject invention.

Man erkennt in den Fig. 8 - 13 einen Hakenabschnitt 50 und an der zugekehrten Seite der Plattform 18 eine Ausnehmung 52, in welche der Hakenabschnitt 40 eingehängt werden kann. Die Ausnehmung 52 verengt sich nach unten, so dass ein leichteres Einführen in die Ausnehmung 52 ermöglicht ist. Unterhalb und seitlich der Ausnehmung sind Führungsbleche 54 vorgesehen mit einem konischen Einführabschnitt. Sie dienen zur Führung des Hakenabschnitts 50 beim Einsetzen in die Ausnehmung 52. Oberhalb des Hakenabschnitts 50 ist ein Vorsprung 56 vorgesehen mit einer vertikalen, planen Gegenfläche 58, die mit einer Anlagefläche 60 an der Oberseite der Plattform 18 zusammenwirkt, wenn, wie dies in Fig. 9 gezeigt wird, der Hakenabschnitt 50 in die Ausnehmung 52 eingeführt wird. Dies geschieht bei der bereits beschriebenen vertikalen Relativbewegung von Plattform 18 und oberen Führungsmitteln 28. Unterhalb der Führungsbleche 54 sind weitere Führungsbleche 62 an einem gemeinsamen länglichen Blech 64 geformt. Ein Gegenblech 66 ist unterhalb des Hakenabschnitts 50 vorgesehen. Die Bleche 64, 66 kommen ebenfalls zur Anlage bei der montierten Position nach Fig. 9. Innerhalb und oberhalb der Führungsbleche 62 ist eine weitere Anlagefläche 68 vorgesehen, die Schraublöcher aufweist für eine Schraubbefestigung der beiden Teile in montierter Position gemäß Fig. 9.One recognizes in the Fig. 8 - 13 a hook portion 50 and on the side facing the platform 18 has a recess 52, in which the hook portion 40 can be hooked. The recess 52 narrows down so that an easier insertion into the recess 52 is made possible. Below and to the side of the recess guide plates 54 are provided with a conical insertion section. They serve to guide the hook portion 50 when inserted into the recess 52. Above the hook portion 50, a projection 56 is provided with a vertical, planar counter surface 58, which cooperates with a contact surface 60 at the top of the platform 18, if, as in Fig. 9 is shown, the hook portion 50 is inserted into the recess 52. This is done in the already described vertical relative movement of platform 18 and upper guide means 28. Below the guide plates 54 further guide plates 62 are formed on a common elongate plate 64. A counter-plate 66 is provided below the hook portion 50. The plates 64, 66 also come to rest in the mounted position Fig. 9 , Within and above the guide plates 62 is another contact surface 68 provided, the screw holes for a screw fastening of the two parts in the mounted position according to Fig. 9 ,

Bei der Ausführungsform nach den Fig. 10 und 11 sind die nach den Fig. 8 und 9 gleichen Teile mit gleichen Bezugszeichen versehen. Der einzige Unterschied zwischen den Fig. 8 und 9 einerseits und den Fig. 10 und 11 andererseits ist, dass keine durchgehenden Bleche zwischen den oberen und unteren Führungsblechen 54, 62 angeordnet sind bzw. unterhalb des Hakenabschnitts 50, vielmehr sind unterhalb und oberhalb der Führungsbleche 54, 62 kürzere Anlagenflächen an entsprechenden Blechkonstruktionen angebracht, die mit Gegenflächen 70, 72 am oberen Führungsteil 28 angebracht sind. Bei der Ausführungsform nach den Fig. 12 und 13 sind wiederum gleiche Teile mit denen nach den Fig. 8 und 9 mit gleichen Bezugszeichen versehen. An der Plattform 18 ist lediglich unterhalb der Aufnehmung 52 eine Anlagefläche 72 mit Schraublöchern vorhanden neben der Anlagefläche 60 oberhalb der Plattform 18 an dem Aufsatzstück 80.In the embodiment of the 10 and 11 are the after the 8 and 9 same parts provided with the same reference numerals. The only difference between the 8 and 9 on the one hand and the 10 and 11 On the other hand, that no continuous plates between the upper and lower guide plates 54, 62 are arranged or below the hook portion 50, but below and above the guide plates 54, 62 shorter contact surfaces are mounted on corresponding sheet metal structures with counter surfaces 70, 72 at the top Guide member 28 are attached. In the embodiment of the FIGS. 12 and 13 are in turn equal parts with those after the 8 and 9 provided with the same reference numerals. On the platform 18, a contact surface 72 with screw holes is present only below the recess 52 next to the abutment surface 60 above the platform 18 on the attachment piece 80th

Claims (11)

  1. A method for installing a floating offshore arrangement having at least three vertical supports (14) on a support structure (12), and which also has a floating platform (18) that is releasably attachable between first position close to the bottom end of the supports (14) and a second position on the supports (14) at a distance from the support structure (12) close to the bottom end of the support (14), and also has guide means for guide pipes and protective pipes as well as rise pipes, comprising the following steps:
    - after assembly, the offshore arrangement is moved to a desired location while floating,
    - then the support structure (12) with the support (14) is lowered in relation to the platform (19) to the ocean floor;
    - then the platform (18) is lifted to a predetermined height above sea level and fixed to these supports (14),
    characterized by the additional steps:
    - while transporting the offshore arrangement and during a first lowering stroke of the support structure (12), bottom and top guide means of the guide means for the guide and protective pipes are supported on the support structure (12); and
    - after a predetermined second lowering stroke of the support structure (12), the support of the top guide means (28) by retention means is taken over by the platform (18) when, while lowering the support structure (12), the guide means reach the height of the platform (18).
  2. An offshore arrangement having a support structure (12) to which at least three vertical supports (14) are attached at a distance; a floating platform (18) that can move along these supports (14) between first position in the bottom area of the support structure (12) and a second position at a distance from the support structure (12); and guide means for guide and protective pipes as well as rise pipes, characterized in that the guide means have top and bottom guide means, wherein the bottom guide means are firmly connected to the support structure (12); the support structure has bracing means for separably bracing the top guide means (28); and the platform (18) has lateral retention means against which the top-guide means (28) are braced when the support structure (12) is lower by predetermined length with reference to the platform (18).
  3. The arrangement according to claim 2, characterized in that the top guide means (28) are arranged in a frame.
  4. The arrangement according to claim 2 or 3, characterized in that the platform (18) has lateral receiving slots or channels for receiving sliding sections of the top guide means.
  5. The arrangement according to claim 2 or 3, characterized in that the top guide means (28) interact via a hook connection having a flange connection underneath with the platform (18) to fix the top guide means to the platform.
  6. The arrangement according to one of claims 3 to 5, characterized in that supports of the frame lie laterally against, or are fixed to, the assigned side surfaces of the platform (18).
  7. The arrangement according to one of claims 2 to 6, characterized in that at least one pair of rails (42) for a rail vehicle (26) is arranged on the platform (18), and the top guide means has at least one pair of rail sections (44) that can be aligned with the rails (42) on the platform (18) when the top guide means (28) are connected to the platform (18).
  8. The arrangement according to one of claims 2 to 7, characterized in that the vertical supports (14) are connected to the bottom end with suction boxes (16).
  9. The arrangement according to one of claims 5-8, characterized in that a side slot for a hook (50) arranged on the top guide means (28) is provided by the platform (18), and at least below the slot, a contact surface (72) having screw holes for an opposing surface (70) is provided below the hook (50).
  10. Arrangement according to claim 9, characterized in that a contact surface (72) is assigned a lateral guide that forms a conical inlet for the section forming the opposing surface.
  11. Arrangement according to claim 10, characterized in that two contact surfaces (72, 68) are arranged at different heights on the platform (18) with which two opposing surfaces (70, 72) interact, and each contact surface (72, 68) is assigned a lateral guide (54, 62).
EP08020928A 2008-12-03 2008-12-03 Method for installing a floatable offshore facility and offshore facility Not-in-force EP2204497B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT08020928T ATE542958T1 (en) 2008-12-03 2008-12-03 METHOD FOR INSTALLING A FLOATING OFFSHORE ARRANGEMENT AND OFFSHORE ARRANGEMENT
DK08020928.1T DK2204497T3 (en) 2008-12-03 2008-12-03 Procedure for installing a floating offshore arrangement
EP08020928A EP2204497B1 (en) 2008-12-03 2008-12-03 Method for installing a floatable offshore facility and offshore facility

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08020928A EP2204497B1 (en) 2008-12-03 2008-12-03 Method for installing a floatable offshore facility and offshore facility

Publications (2)

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EP2204497A1 EP2204497A1 (en) 2010-07-07
EP2204497B1 true EP2204497B1 (en) 2012-01-25

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AT (1) ATE542958T1 (en)
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US10196114B2 (en) 2015-05-13 2019-02-05 Crondall Energy Consultants Ltd. Floating production unit and method of installing a floating production unit

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US8444347B2 (en) * 2010-08-03 2013-05-21 Technip France Truss heave plate system for offshore platform
DE102010035024A1 (en) 2010-08-20 2012-02-23 Impac Offshore Engineering Gmbh Offshore arrangement and method for installing an offshore arrangement
DE102011013853A1 (en) 2011-03-14 2012-09-20 Impac Offshore Engineering Gmbh Self-explanatory off-shore arrangement for transformation system of off-shore wind power plant, has floating body whose lower side comprises holding device for holding air volume, and ventilation path ventilating holding device
EP2650445A3 (en) 2012-04-14 2017-03-15 Matthias Löbermann Base element for fixed installations which can be lowered to the seabed
EP3121338B1 (en) 2015-07-20 2018-03-21 Overdick GmbH & co. KG Off-shore platform with movable connecting elements
MY186362A (en) 2017-02-27 2021-07-16 Technip France Sa Self-installing conductor guide support frame system and method
CN113802535A (en) * 2021-08-27 2021-12-17 中经建研设计有限公司 Multifunctional offshore exploration platform

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US3797256A (en) 1972-09-08 1974-03-19 Sharp Inc G Jack-up type offshore platform apparatus
US4854778A (en) * 1987-09-04 1989-08-08 Cameron Iron Works Usa, Inc. Caisson tower platform and method of setting same

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US10196114B2 (en) 2015-05-13 2019-02-05 Crondall Energy Consultants Ltd. Floating production unit and method of installing a floating production unit

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ATE542958T1 (en) 2012-02-15
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