EP0244542A1 - Verfahren und Vorrichtung zum Heben, insbesondere für eine Ölproduktionsplattform - Google Patents

Verfahren und Vorrichtung zum Heben, insbesondere für eine Ölproduktionsplattform Download PDF

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Publication number
EP0244542A1
EP0244542A1 EP86401781A EP86401781A EP0244542A1 EP 0244542 A1 EP0244542 A1 EP 0244542A1 EP 86401781 A EP86401781 A EP 86401781A EP 86401781 A EP86401781 A EP 86401781A EP 0244542 A1 EP0244542 A1 EP 0244542A1
Authority
EP
European Patent Office
Prior art keywords
leg
platform
lifting
lifting device
support
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Withdrawn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
EP86401781A
Other languages
English (en)
French (fr)
Inventor
Jean-Pierre Cousty
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.)
Technip Geoproduction SA
Original Assignee
Technip Geoproduction SA
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 Technip Geoproduction SA filed Critical Technip Geoproduction SA
Publication of EP0244542A1 publication Critical patent/EP0244542A1/de
Withdrawn legal-status Critical Current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
    • 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
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
    • E02B17/0809—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering the equipment being hydraulically actuated
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0052—Removal or dismantling of offshore structures from their offshore location

Definitions

  • the present invention relates to oil rigs and relates more particularly to the lifting of offshore oil rigs.
  • the sinking of the site results in a subsidence of the seabed on which the pylons of the oil platforms rest so that their height above sea level decreases dangerously and risks within a few years from making these plates - dangerous forms for operating personnel, especially in heavy weather.
  • the invention aims to create a method and a device for ensuring the lifting of an oil platform of a sufficient height to allow the platform to be used despite the depression of the sea floor on which it is, until the exhaustion of the deposit it exploits.
  • the platform shown diagrammatically in FIG. 1 comprises a platform proper or deck 1, supported by tubular legs 2 joined together by lattice 3 of metal beams and bearing on the seabed.
  • a lifting device 4 consisting of a set of hydraulic cylinders.
  • the lifting devices 4 are intended, after cutting each of the legs in an intermediate region between the fixing zones of each of the lifting devices on the leg 2 with which they are associated, to cooperate to ensure the movement of the bridge 1 towards the top of an appropriate distance.
  • FIG.2 there is shown the platform of Fig.1 after lifting. It can be seen that the lifting devices 4 are in the extended position.
  • tubular extensions 5 are interposed ensuring the reconstruction of the continuity of each of the legs.
  • the rods 10 of the jacks 6 are supported by a head 11 welded below the lower part of the deck 1.
  • Fig.3 the cylinders 7 of the lifting device 4 are shown in the retracted position. Between the first support 8 which assembles the upper ends of the cylinders 7 and the head 11 for supporting the rods 10 of the jacks, there is shown in phantom a region 12 in which the leg 2 must be cut. Before cutting, the cylinders 6 of the device 4 are loaded, which then plays the role of reinforcement device by taking up the forces exerted by the mass of the bridge on the corresponding leg.
  • jacks 6 of the lifting device 4 are shown in the extended position, the rods 10 of the jacks being extended and having provided by means of the head 11 of support of their free ends, a displacement towards the top of the upper portion 2b of the leg 2, the lower portion 2a thereof which bears on the seabed itself serving as a support by means of the supports 8 and 9 for assembling the cylinders 7 jacks 6 during the application of the lifting force to the deck 1 by said jacks.
  • the stroke of the cylinder rods 10 corresponds to the lifting height of the platform.
  • This lifting height is materialized by an interval 13 resulting from the relative displacement of the parts 2a and 2b of the leg 2 after cutting of the latter in the zone 12.
  • Fig.5 a first phase of the operation during which after the installation of the lifting device 4 and pressurization of the jacks 6 thereof, we cut in the leg 2 a section of tube in region 12 and we removed it so that the lower leg portions upper 2a and upper 2b are now separated by an interval.
  • the portions 2a and 2b are held in place by the lifting device which thus constitutes, during the initial phase of the operations, a device for strengthening the leg 2.
  • a connecting part 14 is inserted in two parts provided with end flanges 15, 16 joined together by assembly bolts 17.
  • Each of the parts 15, 16 of the part 14 is welded to the end of the corresponding portion 2a, 2b of the leg 2. With this operation, the integrity of the leg 2 is restored while making it separable and therefore ready to undergo the lifting operation of the platform.
  • the two parts 15, 16 of the part 14 are provided with complementary centering cones (not shown) intended on the one hand to center the flanges relative to the other and on the other hand, to support the lateral forces .
  • Fig.7 is a view corresponding to those of Figs.6 and 5 and on which we see that the lifting operation is completed.
  • the rods 10 of the jacks 6 are extended and have caused the leg portion 2b to move upward relative to the por tion 2a and a tubular riser 5 has been inserted in the gap between the ends of the portions 2a and 2b to reconstitute the integrity of the leg 2.
  • the riser 20 has at its ends flanges 21, 22 which are secured to the respective collarettes 15, 16 of the part 14 in two parts which had been inserted in place of the section of tube removed by cutting, during the phase of the operations shown in Fig. 6.
  • the flanges 21, 22 are also provided with centering cones (not shown) complementary to the cones of the flanges 15 and 16 of the part 14 with which they are intended to cooperate.
  • the flanges 15 and 21 on the one hand and 16 and 22 on the other hand, are joined by assembly bolts similar to the bolts 17.
  • This implementation begins with the installation of the head 11 for supporting the ends of the rods 10 of the jacks 6 against the lower part of the bridge 1 surrounding the corresponding leg 2.
  • the bridge 1 has a lower floor 25 provided in the region surrounding the leg 2 with hooking means 26 for cables 27 each wound on a winch 28.
  • Each winch 28 is arranged in a half beam or jaw 29 intended to form after mounting the head 11.
  • Each of the jaws is made in the form of a box of mechanically welded sheet metal and comprises on its side intended to come into contact with the leg 2, a semi-cylindrical recess.
  • the two mas choirs 29 intended to constitute the head 11, respectively hooked to their suspension cable 27.
  • Each of the jaws is provided with a hook 30 intended to cooperate with a cleat 31 provided on the leg 2.
  • the winches 28 located are actuated in each of the jaws 29, the jaws are caused to move upwards until they are in positions facing one another, so that the edges of their semi-cylindrical recesses are in mutual contact and that their hook 30 is engaged with the cleat 31. It is then possible to carry out the edge-to-edge welding operations of the jaws 29 in diametrically opposite regions 31.
  • the head 11 consisting of its two jaws welded together is still suspended on the cables 27.
  • the hooks 30 are then cut and the winches 28 are actuated again to cause the movement of the head 11 along of the leg 2 until it is pressed against the floor 25 of the deck 1 as shown in Fig.10.
  • the head 11 is fixed by welding to the leg 2 on the one hand and to the bridge 25 on the other hand.
  • the cables 27 can then be released from the hooking elements 26 of the floor 25.
  • the winches 28 are then used for the establishment of the intermediate support 8 which is also formed by two half-beams or jaws 32 in the form of a box of mechanically welded sheet metal with a structure similar to that of the jaws of the head 11 and which includes, like these, hooks 33 cooperating with a cleat 34 provided on the leg 2 and disposed at a suitable distance below the cleat 31, intended for the positioning of the head 11.
  • This serves as a suspension element for the jaws 32 which are placed and welded together edge to edge and also to leg 2 in the position shown in Fig. 12. When the welding operations are finished, the hooks 33 are cut.
  • the lower support 9 which will only have to support vertical forces due to its own weight is made of sheet steel. It is much lighter than the head 11 and the intermediate support 8, so that it can be put in place on the leg 2 by lifting means commonly provided on a ship.
  • the head 11 is placed around a vertical portion of the leg 2 while the intermediate support 8 or first support and the lower support 9 or second support are attached to an inclined part of this leg.
  • the intermediate support 8 is shown more clearly in FIG. 16.
  • This support consists, as indicated above, of two jaws 32 whose facing sides welded together comprise semi-cylindrical recesses 35 together defining a passage for the leg 2, the axis of which is parallel to the axis of the inclined part of the leg on which the support 8 is mounted.
  • Each of the jaws 32 which constitute the support 8 comprises a fork 36 intended for receiving the cylinder 7 from a corresponding jack 6.
  • the support 8 advantageously contains a main hydraulic control device, cylinders supply pumps 6 as well as corresponding hydraulic connection pipes (not shown). On the sides of the support 8 are arranged hydraulic fluid reservoirs 37 shown in phantom in Fig. 15.
  • Such an arrangement makes it possible to make up for any inaccuracies in mounting the jacks with a view to ensuring a thrust thereof in a very vertical direction.
  • the lower support 9 which is of a lighter structure than the intermediate support 8, has a semi-circular lateral recess 43 in which the leg 2 is engaged on a portion of its periphery.
  • the support 9 also comprises forks 44 intended to receive the lower ends of the cylinders 7 of the jacks 6.
  • the lifting devices each comprise two jacks. It will be understood, however, that for a platform of greater structure and weight, it it is also possible to provide lifting devices comprising a larger number of jacks. In such a case, the support head of the rods of the jacks and the intermediate and lower supports will be designed in a similar manner to the corresponding elements of this embodiment but so as to receive the desired number of jacks.
  • Figs. 13 and 14 the handling phase of a jack 6 is shown with a view to its positioning in the supports 8 and 9 and under the head 11.
  • a rail 45 a part of which projects in cantilever with respect to the bridge and in which is movably mounted a carriage 46 driven by an electric motor 47 and provided with means for suspending the cylinder 6 via a cable 48.
  • Fig.13 shows the cylinder 6 suspended before its installation
  • Fig.14 shows the cylinder brought by the carriage 46 in the desired position below the head 11, the upper end of the cylinder 7 of the cylinder 6 being engaged in the corresponding fork 36 of the intermediate support 8.
  • This same handling device is used for the installation of the risers 5 once the lifting operations are completed (Fig. 19 and 20).
  • the lifting operations are carried out under the control of a central computer which at all times receives information relating to the position of all the jacks associated with the legs of the platform and which develops the hydraulic circuit for controlling the pumps. supply of the actuators to the control signals intended to cause the acceleration or the slowing of the rise of the rods of the corresponding cylinders according to the attitude reference data of the platform to be observed.
  • each of the jacks is given for example by sensor systems of the electromagnetic type incorporated in the jacks.
  • the cylinders used in the lifting devices are very long stroke cylinders up to six meters.
  • the ends of the cylinder rods bear on a head 11 fixed below the lower part of the bridge. It is also possible to envisage bringing the ends of the rods of the jacks directly against the lower wall of the bridge by providing therein sufficient reinforcing elements to withstand the lifting efforts of the jacks.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Fluid-Damping Devices (AREA)
  • Pallets (AREA)
EP86401781A 1986-05-02 1986-08-08 Verfahren und Vorrichtung zum Heben, insbesondere für eine Ölproduktionsplattform Withdrawn EP0244542A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8606402A FR2588895B1 (fr) 1986-05-02 1986-05-02 Procede et dispositif de relevage, notamment d'une plate-forme d'exploitation petroliere
FR8606402 1986-05-02

Publications (1)

Publication Number Publication Date
EP0244542A1 true EP0244542A1 (de) 1987-11-11

Family

ID=9334875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401781A Withdrawn EP0244542A1 (de) 1986-05-02 1986-08-08 Verfahren und Vorrichtung zum Heben, insbesondere für eine Ölproduktionsplattform

Country Status (4)

Country Link
US (1) US4678372A (de)
EP (1) EP0244542A1 (de)
FR (1) FR2588895B1 (de)
NO (1) NO160592C (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2622225B1 (fr) * 1987-10-21 1990-03-23 Technip Geoproduction Procede de coupe d'un pilier vertical sous charge et dispositif pour sa mise en oeuvre
FR2770237B1 (fr) * 1997-10-24 1999-12-10 Etpm Procede pour rehausser une plate-forme marine
US6115988A (en) * 1997-11-12 2000-09-12 Laminated Wood Systems, Inc. Methods of raising utility pole transmission hardware
US6151860A (en) * 1997-11-12 2000-11-28 Laminated Wood Systems Methods of raising utility pole transmission cables
US7780375B1 (en) 2006-08-30 2010-08-24 Jon Khachaturian Method and apparatus for elevating a marine platform
AU2010356066B2 (en) * 2010-06-21 2017-01-05 Versabar, Inc. Method and apparatus for elevating a marine platform
US8444347B2 (en) * 2010-08-03 2013-05-21 Technip France Truss heave plate system for offshore platform
AU2013252436A1 (en) * 2012-04-25 2014-11-20 Ampjack Industries Ltd. Utility tower lifting apparatus and method
NO337131B1 (no) * 2012-12-28 2016-01-25 1Diamond Llc Et sagesystem, en støttestruktur for en sag og en bytteenhet for sagvaier
NO338419B1 (no) 2014-11-26 2016-08-15 1Diamond As Sagesystem og fremgangsmåte for berging
MX2020005384A (es) * 2017-11-26 2020-12-07 Ampjack Ind Ltd Aparato y metodo de nivelacion de torre de servicios.
NO345448B1 (en) 2018-01-30 2021-02-01 1Diamond As Inclined cut GBS leg
EP3775391B1 (de) * 2018-04-04 2023-07-26 Saipem S.p.A. System und verfahren zum entfernen des decks einer offshore-plattform
US10995512B1 (en) * 2020-02-05 2021-05-04 Osmose Utilities Services, Inc. Temporary support structure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771747A (en) * 1950-07-19 1956-11-27 Bethlehem Steel Corp Offshore drilling barge
US2822670A (en) * 1953-09-02 1958-02-11 Delong Corp Perforated caisson jack assembly
US2995900A (en) * 1954-10-25 1961-08-15 William A Hunsucker Portable marine structure
US3699688A (en) * 1970-11-25 1972-10-24 Bethlehem Steel Corp Apparatus and method for removing and/or adding column sections to a column of a marine structure
GB2064628A (en) * 1978-04-03 1981-06-17 Brown & Root Method of and apparatus for erecting an offshore structure

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2946557A (en) * 1958-05-08 1960-07-26 De Long Corp Jacking mechanism
US3401917A (en) * 1966-07-01 1968-09-17 Offshore Co Hydraulic cylinder apparatus
US4002038A (en) * 1975-10-06 1977-01-11 Raymond International Inc. Method and apparatus for rapid erection of offshore towers
US4040265A (en) * 1976-02-06 1977-08-09 Marine Engineering Systems, Inc. Mobile offshore platform
NO151209C (no) * 1976-05-20 1985-02-27 Doris Dev Richesse Sous Marine Fralandsbyggverk og fremgangsmaate til dets fremstilling
DE3112702A1 (de) * 1981-03-31 1982-10-07 Deutsche Babcock Anlagen Ag, 4200 Oberhausen Hubeinrichtung fuer eine offshore-konstruktion

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771747A (en) * 1950-07-19 1956-11-27 Bethlehem Steel Corp Offshore drilling barge
US2822670A (en) * 1953-09-02 1958-02-11 Delong Corp Perforated caisson jack assembly
US2995900A (en) * 1954-10-25 1961-08-15 William A Hunsucker Portable marine structure
US3699688A (en) * 1970-11-25 1972-10-24 Bethlehem Steel Corp Apparatus and method for removing and/or adding column sections to a column of a marine structure
GB2064628A (en) * 1978-04-03 1981-06-17 Brown & Root Method of and apparatus for erecting an offshore structure

Also Published As

Publication number Publication date
NO160592B (no) 1989-01-23
FR2588895B1 (fr) 1987-12-11
US4678372A (en) 1987-07-07
NO160592C (no) 1989-05-03
FR2588895A1 (fr) 1987-04-24
NO863203D0 (no) 1986-08-08
NO863203L (no) 1987-11-03

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Inventor name: COUSTY, JEAN-PIERRE