EP0228955B1 - Dispositif de support pour jambe de plate-forme pétrolière auto-élévatrice de forage en mer, et plate-forme en comportant application - Google Patents

Dispositif de support pour jambe de plate-forme pétrolière auto-élévatrice de forage en mer, et plate-forme en comportant application Download PDF

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Publication number
EP0228955B1
EP0228955B1 EP86402805A EP86402805A EP0228955B1 EP 0228955 B1 EP0228955 B1 EP 0228955B1 EP 86402805 A EP86402805 A EP 86402805A EP 86402805 A EP86402805 A EP 86402805A EP 0228955 B1 EP0228955 B1 EP 0228955B1
Authority
EP
European Patent Office
Prior art keywords
heightener
leg
platform
support device
centering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86402805A
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German (de)
English (en)
French (fr)
Other versions
EP0228955A1 (fr
Inventor
Pierre-Armand Thomas
Jean-Claude Naudin
Michel Ningler
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 EP0228955A1 publication Critical patent/EP0228955A1/fr
Application granted granted Critical
Publication of EP0228955B1 publication Critical patent/EP0228955B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • E02B17/024—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 shock absorbing means for the supporting construction
    • 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
    • E02B2017/0043—Placing the offshore structure on a pre-installed foundation 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
    • 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
    • E02B2017/0082—Spudcans, skirts or extended feet

Definitions

  • the present invention relates to self-elevating platforms for oil drilling and relates more particularly to production drilling platforms and / or for offshore production operations.
  • Self-elevating platforms for drilling at sea have been used until recently for depths of less than 100 m.
  • Lattice type legs are obtained with frame spacings which may be greater than 20m.
  • the increase in the dimensions of the legs results in a significant increase in weight, in a position of the center of gravity higher in towing, and therefore in a loss of stability, as well as greater drag forces in towing.
  • a self-elevating platform does not work permanently at the maximum depth it can reach.
  • Drilling operators prefer to work with self-elevating platforms, which in the elevated drilling position on their legs, are "fixed" platforms than with semi-submersible platforms which are mobile platforms .
  • the constructions in progress propose to move the border of use of the self-elevating platforms to a depth of 100 / 110m in difficult seas.
  • the invention aims to widen the field of action of self-elevating platforms to depths of 130 / 150m and more to carry out development drilling.
  • a support device for a leg of a self-elevating oil platform for operation at sea of the type comprising a hull mounted movable on several legs intended to bear on the seabed (known from EP-A 42 540).
  • the device is characterized in that it comprises for each leg, an individual and independent riser intended to be interposed between the leg of the platform and the seabed in order to increase the depth of installation of the platform , and to improve its stability, said extension being provided with lockable, removable and adjustable means for rigid fixing at the lower end of the leg.
  • the invention also relates to a self-elevating platform for drilling at sea comprising a hull mounted movable and lockable in position along legs intended to bear on the seabed, characterized in that each leg is provided with a separable riser of the type defined above, secured to the lower end of said leg and intended to be interposed between the leg and the bottom in the operating position of the platform.
  • the self-elevating platform shown in Fig.1 mainly comprises a shell 1 of generally triangular shape mounted movable on three vertical legs 2 intended to bear on the seabed when the platform is in the operating position.
  • the platform is also equipped with a device for moving the shell 1 relative to the legs 2 and means for locking the shell relative to the legs 2 (not shown).
  • each of the legs of the platform is provided to normally allow the establishment of this platform on sites located at depths of the order of 100 to 110m.
  • risers 3 secured in a separable manner to the lower ends of the legs 2.
  • each of the legs 2 has a triangular section and it consists of a lattice of metal beams. It ends at its lower part with a leg 4 (Fig. 4) which, in the present example is hexagonal in shape.
  • a leg 4 (Fig. 4) which, in the present example is hexagonal in shape.
  • Each of the feet 4 is made for example of mechanically welded sheet metal and fixed by welding to the uprights 5 of the corresponding leg.
  • the bearing faces 6 of each foot are advantageously made with a diamond point.
  • each leg 2 of the platform is subject to an extension 3 formed by an upper plate 7 receiving the foot 4 and a lower plate 8 intended to bear on the bottom marine, the upper and lower plates being interconnected by tubular uprights 9.
  • the tubular uprights 9 are in turn connected to each other by lattices of metal beams 10 forming with the beams, the supporting structure of the riser.
  • the upper plate 7 of the extension 3 is made of mechanically welded sheet metal and has a housing 11 of shape corresponding to the foot 4 and in which this foot is engaged with a clearance to allow a catching up of the plate after the establishment of the platform.
  • the bottom 13 of the housing 11 intended to receive the foot 4 of the leg 2 is also made in the shape of a diamond point.
  • jacks 15 of a hydraulic trim adjustment device which will be described in detail with reference to Fig.7.
  • the inner plate 8 is also made of mechanically welded sheet. It is generally circular in shape and has on its underside a shoe 17 with a diamond point intended to penetrate the ground.
  • the legs of the platform are arranged in angular parts 18 enlarged from the hull 1 delimited by end walls 19 respectively parallel to the opposite sides of the hull and by side walls 20 perpendicular to the walls 19 and each connecting with one side of the shell 1.
  • Each leg 2 is arranged in the end portion of the platform so that one of its sides is parallel to the wall d end 19 of this portion.
  • the extension 3 has a frame of section similar to that of the corresponding leg 2, but of larger dimensions.
  • the upper plate 7 of the riser has tabs 22 disposed at 120 ° to which are welded the tubular sleeves 23 intended for receiving piles 24 for anchoring the riser in the ground.
  • the sleeves 23 are also fixed by welding to lugs 25 of the lower plate 8 also arranged at 120 ° .
  • the sleeves 23 are arranged relative to the platform so that two of them are permanently located outside the bulk of the hull in order to allow the placement of the piles by means external to the platform.
  • the third sleeve is disposed below the shell approximately at the level of the bisector of the angle of the latter in which the corresponding leg is mounted and a well 26 is formed in the shell to access this sleeve.
  • the sleeves 23 also serve as a buoyancy stabilization device and are provided for this purpose with shutters 28 arranged at their upper ends.
  • the riser is further equipped with stabilization and immersion chimneys 30, arranged so symmetrical with respect to the shell 1 and fixed to the upper and lower plates 7 and 8 of the riser.
  • the jacks 14 interposed between the bottom 13 of the recess 11 of the upper plate 7 of the riser and the foot 4 of the leg 2, are interconnected by conduits 32 ensuring their communication by valves 32a. They are also each connected to a pressure accumulator 33 by means of a valve 34. Between the base 4 and the bottom 13 of the recess 11 is advantageously disposed a layer 35 of distribution material which may be of the sand trapped in an envelope making a sand box or even flexible products such as elastomers which adapt to the shape of the foot 4.
  • the risers 3 are installed under the hull 1 of the platform in the flotation position as shown in FIGS. 2 and 4. Their stability in this phase is imparted by the sleeves 23 closed and the chimneys 30 which emerge.
  • Each riser is arranged so that the recess 11 of its upper plate 7 receives the foot 4 of the corresponding leg 2.
  • the riser 4 is immobilized relative to the leg 2 by means of the latches 12. It is also immobilized relative to the hull 1 of the platform by means of the towing latches 27 ensuring the immobilization of the tubular sleeves 23 relative to the side walls 20 of the corresponding end portion 18 of the hull 20. Similar towing latches are advantageously provided for immobilizing the chimneys 30.
  • the assembly is then ready to be towed to the operating site.
  • the tubular sleeves 23 and the chimneys 30 ensure the float stabilization of the riser.
  • the towing latches 27 are actuated to release the riser 3 relative to the hull 1 and the legs 2 are moved from below by the displacement devices not shown carried by the shell 1.
  • the stabilization chimneys 30 are also open at their two ends to allow the penetration of water.
  • the pad 17 of the riser On arrival of the riser in contact with the ground in the position shown in FIG. 3, the pad 17 of the riser enters the latter and the legs 25 of the lower plate 8 by bearing on the ground increase the stability seat on the bottom.
  • the pads 17 are larger than those of the feet 4 of the legs 2 of the platform and therefore take up the greater forces due to the increase in depth.
  • the placement of the piles 24 is ensured from the surface from the on-board crane provided on the hull 1 which handles the piles and underwater hammers.
  • the piles are then joined to the sleeves 23 by injection of cement brought to the bottom by the flexible pipe (umbilical) 36, the sleeves 23 being equipped with annular seals at each of their ends (not shown).
  • the mattress 35 of distribution material ensures at this time the distribution of the load of each leg 2 in the recess 11 of the upper plate 8 of the riser.
  • the attitude distribution device shown in Fig. 7 works in turn as a flexible ball joint or, on the contrary, as a rigid recess.
  • the jacks behave like a rigid system in rotation and elastic vertically due to the presence of the accumulators 33.
  • the riser 3. placed on the bottom has a slight inclination relative to the vertical, then the partial opening of the latches 12 for holding the riser relative to the corresponding leg 2.
  • the leg 2 is then free to oscillate slightly relative to the riser due to the clearances made between the recess 11 of the upper plate 7 of the riser and the leg 4 of the leg.
  • valves 32a ensures a re-establishment of the pressures between the jacks 15 and therefore a recovery of the base of the foot 4 which returns to the horizontal position.
  • valves 34 and the valves 32a are closed.
  • the device behaves again as a recess and a rigid support.
  • the pressure accumulator 33 can advantageously consist of an oleopneumatic accumulator battery, while the valves 34 and 32b can be remote-controlled valves using the umbilical 36.
  • the trim device which has just been described can be actuated at the same time as the latches 12 which limit or prevent any movement between the riser 3 and the leg 2 depending on whether the jacks 15 are placed in communication with one another or not .
  • the device can remain in operating mode with surface foundation directly and only by pressing on the pads 17.
  • the structure of the risers can be simplified and not include sleeves for better but only stabilization and immersion chimneys.
  • attitude adjustment devices can also be omitted.
  • the legs of the jack-up platform are fitted with risers, the general construction of which is the same as that described with reference to Figs. 1 to 5 with the exception of the fact that these risers each comprise four tubular sleeves 37 arranged at 90 ° relative to each other at the periphery of the riser so that three of them are located outside the size of the platform.
  • These sleeves also serve as flotation stabilization chimneys, so that it is not necessary to provide special chimneys for this purpose as is the case with the extensions with three sleeves shown in Figs. 1 to 5.
  • the performance increase is ensured by the riser junction installed on the site by the self-elevating platform itself and rigidly nailed or not at the bottom of the sea.
  • the self-elevating platform can be released from its support constituted by the risers on which the legs of the platform are immobilized to become again a conventional self-elevating platform retaining maneuverability. For this purpose, it suffices to release the latches 12 for fixing the legs 2 to their extensions 3.
  • Another important advantage of the invention lies in the fact that a self-elevating platform which has thus been removed by detaching its legs from the risers on which they were initially installed can be brought back to the site and reinstalled on the risers to carry out maintenance work on wells.
  • the arrangement of the invention also makes it possible to produce small oil fields economically at depths of up to 130 to 150 m and more, and to carry out development drilling without fields. installation of a fixed platform and thus avoiding the immobilization of drilling equipment for several years without use but requiring maintenance.
  • FIGS. 8 to 17 Another embodiment of the self-elevating platform according to the invention is shown in FIGS. 8 to 17, the installation of which on a drilling or exploitation site is carried out by the prior installation of the risers on the seabed and by subsequent positioning and securing on said risers of the legs of the platform brought in by flotation.
  • a self-elevating platform comprising a hull 101 floating on the surface of the water and provided with legs 102 capable of being displaced relative to the hull using displacement devices not shown and which can be immobilized relative to the hull using locking means also not shown.
  • the platform is brought above the location of the risers 103 fixed to the seabed, by means of winches 104 provided on the hull 101 which act on respective cables 105, the ends of which are fixed beforehand to the corresponding risers 103.
  • Each leg 102 is provided at its lower end with a foot 106 fitted with a centering stud 107 intended to be engaged in a corresponding orifice 108 formed in an upper plate 109 of the extension 103.
  • Fig.9 there is shown on a larger scale, a riser 103 placed on the seabed F and above it, the lower end of a leg 102 ready to be placed on the tray upper 109 of the extension.
  • the extension 102 has a cross section of generally triangular shape. It consists of the upper plate 109 and three soles or laying floors 110 each connected to the upper plate 109 by three tubular uprights or sleeves 111 in which are engaged piles 112 for anchoring the riser in the seabed. The reinforcement of the assembly thus formed is ensured by a wire mesh 113.
  • the centering orifice 108 formed in the plate 109 has a diameter greater than the centering stud 107 of the foot 106 of the leg 102 so as to make up for any inaccuracies in fitting the risers.
  • the centering orifice 108 has a conical inlet 114 intended to cooperate with a conical end 115 of the centering stud 107 of the leg 102 when it engages in the orifice 108.
  • a housing 116 which opens into the centering orifice 108 and which has a section larger than the latter.
  • rocking latches 119 in the form of stirrups intended to engage with lateral projections 120 of the foot 106 of the platform leg 102 and thus lock the leg on the riser 103 against all vertical displacements.
  • the leg 102 is disposed on the riser 103 in a position offset from its axis of symmetry due to the relative imprecision of positioning the riser 103 on the seabed .
  • This is possible thanks to the possibility of positioning adaptation which the difference in diameter ensures between the centering hole 108 of the upper plate 109 of the riser and the centering stud 107 of the leg 102 shown in FIG. 9.
  • the foot 106 can occupy on the surface of the upper plate 109 of the extension 103, an area 121 shown in phantom with a larger surface area than the size of the foot 106.
  • the foot 106 is placed against an edge of this area 121 and it is placed with clearances J relative to the other two edges of this area.
  • the dimensions of the locking stirrups 119 are also provided so that each of them can come into engagement with the corresponding lateral projection 120 of the platform leg 106 regardless of the position which the foot occupies in the positioning zone. 121 of the extension 103 delimited by a contour in phantom.
  • the riser is provided on two of its sides with docking blade ducks 122 constituted by vertical elastic tubular members.
  • FIGS. 11 and 12 The means for centering a platform leg relative to the riser intended to support it, are shown in more detail in FIGS. 11 and 12.
  • Fig.11 shows the upper plate 109 provided with its centering hole 108 with conical inlet 114 and in which is formed the housing 116 opening into the centering hole 108.
  • the centering washer 117 whose central hole 118 is occupied by the centering stud 107 of the corresponding platform leg.
  • the centering pin 107 is placed against an edge of the centering orifice 108 of the plate 109 and the centering washer 117, called the floating washer, is offset with respect to the axis of the centering orifice 108 and immobilized horizontally by clamping devices 124 mounted in the plate 109.
  • clamping devices consist of cylinders which will be described in detail with reference to Fig. 13.
  • the floating washer 117 can occupy in its recess 116 an area 125 shown in phantom corresponding to all of the positions that the centering pad 107 of the leg 102 can occupy in the centering orifice 108 of the upper plate 109 of the extension.
  • One of the cylinders 124 for clamping the floating washer 117 against the plate 109 is shown in Fig.13. It comprises a jack body 126 movable relative to a fixed rod 127 bearing on a support 128 secured to the upper plate 109 by means of a fixing member such as a screw 129.
  • the jack body 126 is supported on an elastic annular pad 130 surrounding the fixed rod 127 between the head 131 of which and the jack body 126 is formed a chamber 132 supplied with hydraulic fluid by means of a pipe 133.
  • the force developed by the pressurization of the chamber 132 compresses the elastic annular pad 130 so that the jack body 126 is retracted inside its housing 134 formed in the upper plate 109.
  • the floating washer 117 which the absence of pressure applied to the chamber 132 is kept tight against the interior wall of the housing 116 of the upper plate 109 is then released and can slide inside the housing 116.
  • pads are advantageously constituted by a stack of elastomer washers and rigid washers, for example metallic washers bonded to each other.
  • the seal between the mobile cylinder body 126 and the fixed rod 127 of the cylinder can advantageously be obtained using elastomer sleeves 127a adhered to the cylinder body 126 and on the rod 127, these sleeves being deformable into shear.
  • a centering device of the type which has just been described with reference to FIGS. 11 to 13 is provided on only two risers of a platform with three legs each provided with a riser.
  • the centering orifice 108a has an inside diameter equal to the outside diameter of the centering stud 107 of the corresponding leg, so that this third riser defines a platform positioning reference.
  • each platform leg on its riser The vertical locking means of each platform leg on its riser are shown in more detail in Figs. 14 to 17.
  • each extension 103 is provided with three latches 119 in the form of stirrups mounted tilting on its upper plate 109 and which are in the separated position before the positioning of the foot 106 of the corresponding leg 102 on the plate 109.
  • the lock 119 is shown in solid lines in its blocking position of the foot 106 of the corresponding leg 102 and in phantom in its position apart.
  • the latch 119 completely releases the laying surface 121 from the plate 109 (FIG. 10).
  • Each latch 109 has a cross member 135 (Fig. 15) whose width is sufficient to cover the corresponding projection or sole 120 of the foot 106 placed randomly on the laying surface 121.
  • the underside 136 of each cross member 135 as the part upper 137 of the sole 120 are flat surfaces which come into contact with one another when the tilting latches 119 are in the closed position.
  • Each of the locks is articulated around an axis 138 and comprises two arms 139 and two locking plates 140 each provided with a light 141.
  • a sliding latch 142 maneuvered by a jack 143 is mounted in the upper plate 109 of the riser right of the lights 141 when the stirrup 119 is in the closed or locked position.
  • FIG. 16 shows a latch 142 in the released position out of the slot 141 of the corresponding locking arm 140 of the stirrup 119.
  • the jack 143 is in the rest position.
  • Fig.17 it can be seen that the latch 142 has been engaged in the slot 141 of the corresponding locking arm 140 under the action of the jack 143 which is held in this active position.
  • the locking is further improved by the introduction of the end of the latch 142 into a slot 144 formed in a vertical wall 145 of the upper plate 109.
  • the arrangement of self-elevating platform which has just been described makes it possible to ensure the relatively easy positioning of the legs of the platform on risers previously mounted on the operating site.
  • the platform is brought to the site and the legs 103 are lowered one after the other so that each of them comes to bear on one of the risers.
  • One begins for this purpose by lowering the leg intended to be placed on the riser provided with a centering hole 108a of diameter equal to that of the centering stud 107 of its foot 106.
  • This first leg 102 is positioned using the winches 104 arranged on the platform. A first positioning of the leg 102 relative to its riser is facilitated by the coming into contact of the leg 102 with the dolphins 22 provided on two sides of the riser 103.
  • the first leg 102 When the first leg 102 is placed on its riser 103, it determines a reference axis around which the whole of the platform can be rotated until the other legs 102 of the latter are opposite corresponding extensions 103. These legs are then lowered so that their centering studs 107 penetrate into the centering holes 108 of larger diameter formed in the upper plates 109 of the other two risers and penetrate into the central holes 118 of the corresponding floating washers 117 by moving them laterally. towards the position where they will be immobilized.
  • the floating washers 117 are immobilized horizontally by actuating the jacks 124 which, as seen in FIG. 12, are arranged in a ring so as to exert a uniform clamping force on the washer 117.
  • Locks 119 are then actuated in the shape of a stirrup, the cross members 135 of which are applied to the lateral projections or soles 120 of each of the feet 106.
  • the latches 119 are thus immobilized by the introduction of the latches 142 in their respective slots 141.
  • platform is then immobilized horizontally by the floating washers 117 tightened by their jacks 124 and vertically by the latches 119, and can withstand the horizontal forces as well as the vertical forces and the moments which it undergoes.
  • one of the extensions has a centering orifice 108a of the same section as the centering stud 107 of the corresponding platform leg.
  • all of the extensions include a centering washer 117 and means for immobilizing the latter.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
EP86402805A 1985-12-19 1986-12-15 Dispositif de support pour jambe de plate-forme pétrolière auto-élévatrice de forage en mer, et plate-forme en comportant application Expired - Lifetime EP0228955B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8518884 1985-12-19
FR8518884A FR2592075B1 (fr) 1985-12-19 1985-12-19 Dispositif de support pour jambe de plate-forme petroliere auto-elevatrice de forage en mer, et plate-forme en comportant application

Publications (2)

Publication Number Publication Date
EP0228955A1 EP0228955A1 (fr) 1987-07-15
EP0228955B1 true EP0228955B1 (fr) 1990-04-18

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EP86402805A Expired - Lifetime EP0228955B1 (fr) 1985-12-19 1986-12-15 Dispositif de support pour jambe de plate-forme pétrolière auto-élévatrice de forage en mer, et plate-forme en comportant application

Country Status (9)

Country Link
US (1) US4762442A (no)
EP (1) EP0228955B1 (no)
JP (1) JPS62215710A (no)
BR (1) BR8606289A (no)
CA (1) CA1264229A (no)
DK (1) DK165760C (no)
FI (1) FI87477C (no)
FR (1) FR2592075B1 (no)
NO (1) NO174355C (no)

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US4583881A (en) * 1984-05-29 1986-04-22 Bethlehem Steel Corporation Mobile, offshore, jack-up, marine platform adjustable for sloping sea floor

Also Published As

Publication number Publication date
FI87477B (fi) 1992-09-30
NO174355B (no) 1994-01-10
CA1264229A (en) 1990-01-09
EP0228955A1 (fr) 1987-07-15
FR2592075A1 (fr) 1987-06-26
FI865160A0 (fi) 1986-12-17
FR2592075B1 (fr) 1988-06-24
FI87477C (fi) 1993-01-11
FI865160A (fi) 1987-06-20
JPH051846B2 (no) 1993-01-11
DK165760C (da) 1993-06-14
NO865113D0 (no) 1986-12-17
DK612086D0 (da) 1986-12-18
NO174355C (no) 1994-04-20
BR8606289A (pt) 1987-10-06
DK165760B (da) 1993-01-11
DK612086A (da) 1987-06-20
US4762442A (en) 1988-08-09
NO865113L (no) 1987-06-22
JPS62215710A (ja) 1987-09-22

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