WO1995018907A1 - Procede et dispositif d'intallation d'une colonne montante sur une bouee sous-marine - Google Patents

Procede et dispositif d'intallation d'une colonne montante sur une bouee sous-marine Download PDF

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Publication number
WO1995018907A1
WO1995018907A1 PCT/NO1994/000006 NO9400006W WO9518907A1 WO 1995018907 A1 WO1995018907 A1 WO 1995018907A1 NO 9400006 W NO9400006 W NO 9400006W WO 9518907 A1 WO9518907 A1 WO 9518907A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
buoy
support
accordance
procedure
Prior art date
Application number
PCT/NO1994/000006
Other languages
English (en)
Inventor
Sigmund Askestad
Original Assignee
Norsk Hydro A.S
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
Priority to NO922679A priority Critical patent/NO177544C/no
Priority claimed from NO922679A external-priority patent/NO177544C/no
Application filed by Norsk Hydro A.S filed Critical Norsk Hydro A.S
Priority to PCT/NO1994/000006 priority patent/WO1995018907A1/fr
Publication of WO1995018907A1 publication Critical patent/WO1995018907A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • E21B17/015—Non-vertical risers, e.g. articulated or catenary-type

Definitions

  • the present invention concerns a procedure and device for installing a riser pipe (herinafter riser) on a submarine buoy or supporting construction in connection with the production of oil and gas at sea, where the riser emerges from a well head, a production line or similar and passes in a loop via the buoy to a production platform, ship or similar on the surface of the sea.
  • riser riser pipe
  • the riser is placed in a loop over a buoy or similar as stated above to prevent it being exposed to damaging tensile loads when the platform or ship is displaced or moves in any other way on the surface of the sea as a result of waves, currents and wind.
  • the riser is mounted on the buoy on the surface, after which the riser and the buoy, and possibly an anchor, are lowered down to the sea floor.
  • This method is unsuitable with large and rigid risers on account of problems with handling the risers and on account of the heavy weight of the pipes, buoy and anchor.
  • the buoy and anchor are installed in advance. Then the riser (one or more) is lowered and fastened to the buoy. With this solution the individual riser must meet the fastening point on the buoy with great precision in both lateral and longitudinal directions since a device fastened onto the riser must be locked into a corresponding cavity or track in the buoy. This, in its turn, requires precise positioning equipment and is demanding in terms of both time and technology. Moreover, the risers with the solution mentioned here are exposed to damage during installation since the outer wall of the pipes, which is made of plastic material, can easily be destroyed by contact with the steel construction of the buoy.
  • the buoy is exposed to high toppling moments from the risers during dynamic loads and movements of the platform or ship, which leads to the buoy heeling over and load on the risers.
  • the procedure in accordance with the present invention is based on a solution in which a buoy or supporting construction is pre- installed on the sea floor and which is characterised in that each individual riser is provided with a support or casing before it is lowered down to and fastened to a pre-installed centring and fastening device on the buoy, as defined in claim 1.
  • a device for carrying out the procedure in accordance with the present invention is characterised by a curved support or casing which protects the riser and which is designed to be fastened to a corresponding centring and fastening device on the buoy, as stated in claim 4.
  • Fig. 1 shows an oil/gas installation at sea with a riser placed in a loop over a buoy.
  • Fig. 2 shows in large scale a buoy with a riser which is provided with a support or casing in accordance with the present invention.
  • Fig. 3 shows an alternative design of support and a centr ⁇ ing/fastening device in accordance with the present invention.
  • Fig. 1 shows an oil/gas installation at sea in which a riser 1 emerges from a well head 2 on the sea floor and passes in a loop over a buoy 3 to an anchored production platform 4 on the surface of the sea.
  • Fig. 2 shows in large scale a buoy 3 anchored to an anchor 5 on the sea floor by means of stays 6. Two risers 1 are already mounted on the buoy in the situation depicted, while a third riser is being lowered and installed on the buoy.
  • each of the risers 1 is provided with a support 7 before it is lowered and installed in a centring and fastening device on the buoy.
  • the riser is provided with a U-shaped support 7 which is curved with a radius of curvature which is adapted to the shape of the buoy and which produces the lowest possible bending loads on the riser.
  • the support and the other parts of the buoy and the buoy construction are of a material and such a design and strength that they can withstand the forces to which they are exposed during installa ⁇ tion and operation.
  • the support 7 is provided with an inclined male centring part 8 which is designed to be inserted in a complementary female centring part 9 on the buoy. This ensures that the riser is kept in a fixed position and cannot be moved sideways on the buoy.
  • the centring parts 8, 9 are also designed with male and female parts, seen in the longitudinal direction in section B-B in Fig. 2, to centre the riser in the correct position and prevent it from being moved lengthways in relation to the buoy.
  • steering lines 11 are used which pass from a surface vessel to the buoy and where the supports 7, 8 are provided with guide rings 12 which are designed to be passed along these lines during the lowering operation.
  • Fig. 3 shows an alternative design of support 13 in which the curved part of the riser comprises a rigid steel pipe 14 and in which the flexible parts 16 of the riser are connected with the rigid steel pipe 14 by means of pipe couplings 15.
  • the pyramid-shaped centring parts 17 on the upper part of the buoy 19/support 13 and the V-shaped centring parts 10, 21 on the lower part of the buoy/support ensure that the riser and support are centred in the correct position and prevented from moving sideways and lengthways in relation to the buoy.
  • Fig. 2 the use of steering lines was mentioned and shown to steer the risers towards the buoy during the lowering of the pipes.
  • the most practical method may be to use an electronic steering system with transmitters installed on the buoy and a receiver installed on the vessel on the surface of the sea which are designed, via the vessel's steering system, to position the vessel so that the riser can be lowered into the correct centring "track” on the buoy.
  • the buoy should preferab ⁇ ly be provided with high guide plates 18 to ensure that the risers are conducted into the stated centring "track” on the buoy.
  • the support is provided with bell-like transition pieces 19 where the riser passes over the buoy.
  • the purpose of these bell parts is to prevent the riser being exposed to high bending loads in the transition parts on the buoy when it is moved horizontally, vertically or sideways.
  • a solution is shown where a flexible riser is placed in a curved, U-shaped support, and in the latter example, Fig. 3, a rigid pipe piece is used which is inserted into the flexible riser by means of couplings and which is fastened to a curved support which has other centring devices.
  • the support can have the shape of a pipe-shaped casing and can be centred and kept in place in a U-shaped track in the buoy or have other "track" shapes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention se rapporte à un procédé et un dispositif qui permet d'installer une colonne montante sur une bouée sous-marine ou une structure-support en connexion avec la production de pétrole et de gaz, en mer. Ce procédé et ce dispositif utilisant au-moins une colonne montante qui émerge d'une tête de forage, une ligne de production ou similaire placée sur la surface du fond marin et qui passe dans une boucle au-dessus d'une bouée pour atteindre une plate-forme, un bateau ou similaire à la surface de la mer. On équipe la colonne montante ou les tuyaux (1) d'un support ou d'une gaine (7, 8), ainsi que les tuyaux individuels, avant de les abaisser et de les fixer à un dispositif de centrage et de fixation pré-installé (13) sur la bouée (3, 19).
PCT/NO1994/000006 1992-07-08 1994-01-07 Procede et dispositif d'intallation d'une colonne montante sur une bouee sous-marine WO1995018907A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NO922679A NO177544C (no) 1992-07-08 1992-07-08 Fremgangsmåte og anordning ved montering av et stigerör til en undersjöisk böye
PCT/NO1994/000006 WO1995018907A1 (fr) 1992-07-08 1994-01-07 Procede et dispositif d'intallation d'une colonne montante sur une bouee sous-marine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO922679A NO177544C (no) 1992-07-08 1992-07-08 Fremgangsmåte og anordning ved montering av et stigerör til en undersjöisk böye
PCT/NO1994/000006 WO1995018907A1 (fr) 1992-07-08 1994-01-07 Procede et dispositif d'intallation d'une colonne montante sur une bouee sous-marine

Publications (1)

Publication Number Publication Date
WO1995018907A1 true WO1995018907A1 (fr) 1995-07-13

Family

ID=26648366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1994/000006 WO1995018907A1 (fr) 1992-07-08 1994-01-07 Procede et dispositif d'intallation d'une colonne montante sur une bouee sous-marine

Country Status (1)

Country Link
WO (1) WO1995018907A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000031372A1 (fr) * 1998-11-23 2000-06-02 Foster Wheeler Energy Limited Support flottant ancre pour systeme de tubes ascenseur relie a un vaisseau de production flottant
FR2889557A1 (fr) * 2005-08-04 2007-02-09 Technip France Sa Installation sous marine equipee d'une conduite flexible a courbure controlee
CN103958819A (zh) * 2011-11-30 2014-07-30 塞佩姆股份公司 包括至少两个水平高度的多重柔性海底到海面连接装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400110A (en) * 1981-11-05 1983-08-23 Standard Oil Company (Indiana) Flexible riser underwater buoy
GB2191230A (en) * 1986-06-05 1987-12-09 Bechtel Ltd Flexible riser system
NO922679L (no) * 1992-07-08 1994-01-10 Norsk Hydro As Fremgangsmaate og anordning ved montering av et stigeroer til en undersjoeisk boeye

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400110A (en) * 1981-11-05 1983-08-23 Standard Oil Company (Indiana) Flexible riser underwater buoy
GB2191230A (en) * 1986-06-05 1987-12-09 Bechtel Ltd Flexible riser system
NO922679L (no) * 1992-07-08 1994-01-10 Norsk Hydro As Fremgangsmaate og anordning ved montering av et stigeroer til en undersjoeisk boeye

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000031372A1 (fr) * 1998-11-23 2000-06-02 Foster Wheeler Energy Limited Support flottant ancre pour systeme de tubes ascenseur relie a un vaisseau de production flottant
US6595725B1 (en) 1998-11-23 2003-07-22 Foster Wheeler Energy Limited Tethered buoyant support for risers to a floating production vessel
FR2889557A1 (fr) * 2005-08-04 2007-02-09 Technip France Sa Installation sous marine equipee d'une conduite flexible a courbure controlee
WO2007017574A1 (fr) * 2005-08-04 2007-02-15 Technip France Installation sous-marine équipée d'une conduite flexible à courbure contrôlée
US7789588B2 (en) 2005-08-04 2010-09-07 Technip France Subsea system provided with a controllable curvature flexible pipe
NO337882B1 (no) * 2005-08-04 2016-07-04 Technip France Sa Undervannssystem for overføring av hydrokarboner mellom et sjøbunnsystem og et overflatesystem samt fremgangsmåte for å implementere samme
CN103958819A (zh) * 2011-11-30 2014-07-30 塞佩姆股份公司 包括至少两个水平高度的多重柔性海底到海面连接装置

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