EP0071297A1 - Pilier pour constituer une plateforme de forage ou de production - Google Patents

Pilier pour constituer une plateforme de forage ou de production Download PDF

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Publication number
EP0071297A1
EP0071297A1 EP82200913A EP82200913A EP0071297A1 EP 0071297 A1 EP0071297 A1 EP 0071297A1 EP 82200913 A EP82200913 A EP 82200913A EP 82200913 A EP82200913 A EP 82200913A EP 0071297 A1 EP0071297 A1 EP 0071297A1
Authority
EP
European Patent Office
Prior art keywords
tower
supporting foot
water
foot
annular
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.)
Withdrawn
Application number
EP82200913A
Other languages
German (de)
English (en)
Inventor
Hendrik Veth
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.)
Ingenieursbureau H Veth BV
Original Assignee
Ingenieursbureau H Veth BV
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 Ingenieursbureau H Veth BV filed Critical Ingenieursbureau H Veth BV
Publication of EP0071297A1 publication Critical patent/EP0071297A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • E02B2017/0065—Monopile 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
    • E02B2017/0082—Spudcans, skirts or extended feet

Definitions

  • a tower which is assembled from annular steel elements, and is, at least in the lower portion, frusto-conically shaped, the lower part being connected to at least three diverging legs and to a bottom closing the inner space, which legs are to be connected to a substructure anchored to the sea bottom and surrounding the well site, which bottom should be resistant to the water pressure at the water depth in question, and is provided with water-tight passages for ducts to be connected to the well, said legs being provided, at their lower ends, with ballast means such as compartments to be internally filled with water.
  • Such a tower when provided with a superstructure or platform assembly, comprising an engine room, crew housing etc., which can be constructed as a landing place for helicopters, is adapted to be towed floating in the vertical position towards the drilling site, and to be lowered there on the substructure.
  • Such a tower can be assembled from unit elements manufactured elsewhere, and, after completing the legs and at least the lowermost element on a slipway or another suitable building site, the whole is lowered into the water, and, if required, is weighted by means of the ballast spaces in the legs, until the upper side will slighty protrude above the water, and then a next element is supplied by means of a crane or pontoon, and is welded to the portion protruding above the water. Finally the superstructure can be floated on pontoons above the completed tower and connected thereto, after which the whole assembly can be towed away by means of these pontoons. If necessary a completed portion can be towed towards deeper water between times in order to be finished. On arrival in the point of utilisation the whole assembly can be lowered by weighting the pontoons, and then the latter can be taken away.
  • the invention provides, in this respect, an improvement of the tower according to the above-mentioned prior patent application, the tower being completely assembled from annular elements, the lowermost annular element being constructed as or provided with a supporting foot which is annular as well, and which is designed to carry the weight of the tower, said supporting foot being provided with seats for taking up anchoring means.
  • Such a tower can be supported as such on a flat sea bottom, and generally no substructure is required. Manufacturing and erecting, and also maintenance, of such a tower are considerably more economic than in the case of the current towers made from steel columns or reinforced concrete.
  • the inner space of the tower is, at least for a substantial part, not closed so that this space is pervaded by water.
  • the bottom of the tower of the above-mentioned prior patent application should, in particular in deep water, withstand considerable pressures, so that manufacturing it can be expensive. Also making duct passages through said bottom which are resistant against such pressures can be expensive.
  • said ducts in a water pervaded tower are, at any rate, shielded from water currents so that suspension and support thereof is simple, and protection against corrosion is relatively simple in the stagnant water, and can favourably compare with the cost of a pressure resistant bottom.
  • the inner wall of the supporting foot and/or of the annular elements can be provided with stiffeners which, in particular, can be constructed as parts of a double wall which, in this manner, is divided into compartments so that, apart from a higher stiffness, also the possibility is provided to use these compartments as floating or as ballast compartments.
  • a supporting ring In the centre of the supporting foot and also of annular elements situated at a higher level a supporting ring can be provided which is adapted to surround the well head means and ducts respectively present there, and is connected to the circumferential part of the foot or the element in question respectively, and said rings can also be used for supporting and shielding such well head means or ducts respectively.
  • the interior of the tower can be provided with one or more transverse partitions so as to allow to maintain during transport one or-more air compartments, in particular in the upper part of the tower, said compartments contributing to the buoyancy, and said transverse partitions are not subjected to very high water pressures, and, therefore, do not need to be made very strong, said partitions being eventually removed for clearing the interior for passing drilling strings, ducts etc. If the tower is to be transported floating in a substantially horizontal position, the inner space can also be closed near the other extremity by means of additional removable partitions.
  • This tower consists of a plurality of superposed substantially frusto-conical elements 3 with an annular cross-section, adjoining edges thereof having the same diameter, and being interconnected by means of a welding connection.
  • the cone angle of the different elements decreases upwardly, this in such a manner that an optimal resistance against bending moments as a consequence of forces acting on the upper end is obtained.
  • such moments are also generated by the wind forces, wave beat and water currents acting on the tower 1.
  • the lowermost element 3 joins an annular supporting foot 5 having a bottom 6 bearing on the sea bottom 7.
  • the foot 5 will, at a plane sea bottom, penetrate somewhat into the bottom 7.
  • the weight of the tower 1 will then be uniformly distributed over the supporting foot 5.
  • the diameter of the foot 5 and, therefore, also of the lower edge of the adjoining element 3, is sufficiently large for temporarily ensuring the lateral stability of the tower 1.
  • the supporting foot 5 is, moreover, provided with sleeves or seats 8 distributed along the circumference, and being adapted for taking up ram piles 9, and the upper ends 10 of the sleeves 8 can be widened for facilitating the introduction of the piles 9.
  • the piles 9 are fixed in the foot in a suitable manner, e.g. by means of cement. These piles 9 not only serve for anchoring the supporting foot 5 against lateral displacements, but also for taking up tilting moments, the piles then being loaded by traction.
  • a ring 11 is present which is connected, by means of transverse connections 12, to the outer side of the foot.
  • This ring comprises an area 13 in which ducts and/or well head closure means are present, which are diagrammatically indicated at 14 in Fig. 2.
  • This ring 11 can serve for supporting and fixing purposes, and laterally shields the well head portion.
  • the higher wall elements can be provided with similar rings 11' and transverse connections 12', by means of which ducts can be supported.
  • the higher elements 3 reach, eventually, a diameter which substantially corresponds to that of the rings 11 and 11' so that, there, such rings will be superfluous.
  • these rings 11 and 11' can be made so that the bundle of ducts led upwardly will have a gradually reduced diameter.
  • the supporting foot 5 can, furthermore, provide an inner wall 15 defining with the outer wall an interspace which is divided, by means of transverse partitions 16, into compartments 17, the whole then being additionally stiffened, and, moreover, these compartments can be completely closed by means of terminal walls 18 so that they can serve as ballast spaces.
  • the elements 3 can be provided with an inner wall 15' and partitions 16', as well as with terminal walls 18' so as to obtain a wall stiffening, and the spaces 17 and 17', in particular in the lower wall elements, can be connected to pumps so as to be filled at will with water and to be emptied again so as to control the buoyancy.
  • Fig. 3 a cross-section of the upper part of the tower is shown, in which the wall can be singular, and only vertically directed stiffening means 19 are provided at the inner side which, if required, can be interconnected by means of annular transverse stiffeners 20.
  • the inner space 21 of the tower remains open so that this space is filled with water.
  • This tower can, for instance, with the superstructure provided thereon, be towed in the upright position towards the utilisation point.
  • the buoyancy is provided i.a. by the air-filled spaces 17 and 17' of the supporting foot and the remaining elements 3 respectively, and, if required, additional floats can be connected to the tower.
  • water can be admitted into the compartments 17, and, as the case may be, also in the compartments 17' of the lower elements, so as to allow the tower to be sunk in the upright position until the foot 5 reaches the bottom, and then the foot can be anchored by the ram piles 9.
  • a transverse partition In order to provide possibly required additional buoyancy, it may sometimes be favourable to close the upper portion of the space 21 in a water-tight manner by means of a transverse partition, so that, then, no water can penetrate into the overlying portion of the inner space.
  • This partition is to be removed before the ducts are provided.
  • Such a partition is preferably arranged as high as possible so as to be submitted to a possibly low water pressure.
  • Such a tower can be assembled in the same manner as the tower of the above-mentioned prior patent application, viz. by assembling at first the lower portion on a slipway or an other suitable construction site, launching it into the water, and thereafter providing the consecutive elements 3, the buoyancy always being controlled so that a next element can be placed on a preceding one by means of pontoons or a crane, and can be welded thereto above the water level. If necessary a completed portion can be towed towards deeper water for being finished there. Finally the superstructure 2 is supplied in parts, and is, depending on circumstances, mounted on the finished tower, which, if required, can also be done after having lowered the tower on the sea bottom in the point of utilisation.
  • a substructure consisting, for example, of concrete can be provided on the sea bottom first, which is lowered on the sea bottom by flooding ballast spaces so that this substructure will remain anchored to the sea bottom by its own weight.
  • the height of this substructure is chosen so that the tower to be lowered thereon has a height at which said undesired phenomena will no longer take place.
  • the substructure is then provided with fastening means which can be fixed in the sleeves 8 of the foot 5.
  • An additional advantage of such a substructure is that pile ramming at a large depth is no longer necessary, and anchoring of the foot 5 can take place at a smaller depth,and, of course, the strenght of the tower is to be adapted to a smaller depth.
  • the total cost of such an assembly will, nevertheless, be more favourable than when using a tower of the current type.
  • a substructure For the rest such a substructure can also be used if the sea bottom is not suitable for anchoring the foot of the tower directly thereon, and, of course, the f height of the substructure should be chosen as small as possible as will be compatible with the required weight of the substructure.
  • Fig. 4 shows a slightly modified embodiment of the lower portion of such a tower, in which the foot 5 is widened outwards, and the sleeves 8 are situated inside its circumference. In the case shown these sleeves form a part of the transverse partitions 16.
  • the various ducts can be supported within the tower in a simple manner, and are completely shielded by the tower against the influence of water currents.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)
EP82200913A 1981-07-23 1982-07-16 Pilier pour constituer une plateforme de forage ou de production Withdrawn EP0071297A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL8103480 1981-07-23
NL8103480 1981-07-23
NL8200232 1982-01-21
NL8200232A NL8200232A (nl) 1981-07-23 1982-01-21 Toren voor het vormen van een boor- en/of winningseiland.

Publications (1)

Publication Number Publication Date
EP0071297A1 true EP0071297A1 (fr) 1983-02-09

Family

ID=26645716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200913A Withdrawn EP0071297A1 (fr) 1981-07-23 1982-07-16 Pilier pour constituer une plateforme de forage ou de production

Country Status (3)

Country Link
EP (1) EP0071297A1 (fr)
NL (1) NL8200232A (fr)
NO (1) NO822460L (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096650A1 (fr) * 1982-06-02 1983-12-21 Man Gutehoffnungshütte Gmbh Colonne de support pour une plate-forme off-shore et son procédé de construction
FR2674899A1 (fr) * 1991-04-05 1992-10-09 Starkier Henri Installation pour effectuer des forages et des pompages sous-marins.
FR2675169A1 (fr) * 1991-04-12 1992-10-16 Doris Engineering Support de structure en mer et son procede d'installation.
WO2007093842A1 (fr) * 2005-04-18 2007-08-23 Compass Energy Pte Ltd Plate-forme marine reposant sur le fond a flottaison reduite
WO2010013990A1 (fr) * 2008-07-28 2010-02-04 A Mas T Sociedad Civil Procédé permettant de construire des plateformes marines flottantes à partir de dalles de béton et dalles utilisées à cet effet

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738113A (en) * 1971-10-14 1973-06-12 Chicago Bridge & Iron Co Offshore oil storage structure with submergence shell
FR2215823A5 (fr) * 1973-01-26 1974-08-23 Campenon Bernard Europe
US4151888A (en) * 1977-04-28 1979-05-01 Hollandsche Beton Groep N.V. Submergible pile driver with extension tube to accommodate tensioned cable string loops
GB2021182A (en) * 1978-05-18 1979-11-28 Veth H Ingbureau Installing Offshore Drilling Platforms
CA1081483A (fr) * 1978-06-21 1980-07-15 Dome Petroleum Limited Plate-forme pour le forage off-shore
FR2464336A2 (fr) * 1979-08-31 1981-03-06 Sea Tank Co Structure poids d'exploitation offshore, plus particulerement destinee a une installation sur un sol de mauvaise qualite

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738113A (en) * 1971-10-14 1973-06-12 Chicago Bridge & Iron Co Offshore oil storage structure with submergence shell
FR2215823A5 (fr) * 1973-01-26 1974-08-23 Campenon Bernard Europe
US4151888A (en) * 1977-04-28 1979-05-01 Hollandsche Beton Groep N.V. Submergible pile driver with extension tube to accommodate tensioned cable string loops
GB2021182A (en) * 1978-05-18 1979-11-28 Veth H Ingbureau Installing Offshore Drilling Platforms
CA1081483A (fr) * 1978-06-21 1980-07-15 Dome Petroleum Limited Plate-forme pour le forage off-shore
FR2464336A2 (fr) * 1979-08-31 1981-03-06 Sea Tank Co Structure poids d'exploitation offshore, plus particulerement destinee a une installation sur un sol de mauvaise qualite

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096650A1 (fr) * 1982-06-02 1983-12-21 Man Gutehoffnungshütte Gmbh Colonne de support pour une plate-forme off-shore et son procédé de construction
FR2674899A1 (fr) * 1991-04-05 1992-10-09 Starkier Henri Installation pour effectuer des forages et des pompages sous-marins.
FR2675169A1 (fr) * 1991-04-12 1992-10-16 Doris Engineering Support de structure en mer et son procede d'installation.
WO2007093842A1 (fr) * 2005-04-18 2007-08-23 Compass Energy Pte Ltd Plate-forme marine reposant sur le fond a flottaison reduite
WO2010013990A1 (fr) * 2008-07-28 2010-02-04 A Mas T Sociedad Civil Procédé permettant de construire des plateformes marines flottantes à partir de dalles de béton et dalles utilisées à cet effet

Also Published As

Publication number Publication date
NO822460L (no) 1983-01-24
NL8200232A (nl) 1983-02-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19820726

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19841123

RIN1 Information on inventor provided before grant (corrected)

Inventor name: VETH, HENDRIK