EP2748404B1 - Mécanisme de verrouillage - Google Patents

Mécanisme de verrouillage Download PDF

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Publication number
EP2748404B1
EP2748404B1 EP12791258.2A EP12791258A EP2748404B1 EP 2748404 B1 EP2748404 B1 EP 2748404B1 EP 12791258 A EP12791258 A EP 12791258A EP 2748404 B1 EP2748404 B1 EP 2748404B1
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EP
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Prior art keywords
unit
heave compensation
heave
compensation
attached
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EP12791258.2A
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German (de)
English (en)
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EP2748404A2 (fr
Inventor
Gjerulf Ottersland
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Mhwirth AS
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Aker MH AS
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    • 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
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • E21B15/02—Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/09—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string

Definitions

  • the invention relates to well operations, especially in connection with production of hydrocarbons from underground formations. More specifically, the invention relates to a device for heave compensation of equipment on a moving vessel, as disclosed in the preamble of the independent claims.
  • Light well intervention is carried out with the aid of wireline operations from a ship.
  • Heavy well intervention (which includes the whole spectrum of intervention work) is usually carried out from a special moored, semi-submersible rig that is connected to the wells via a riser (pipe for gas and/or liquid).
  • the special rig fills the gap between the ordinary drilling rigs and the vessels that carry out light well intervention, using wireline operations and has, inter alia, substantially lower costs than an ordinary drilling rig.
  • Known floating intervention rigs have a drilling machine suspended from a tower via a heave compensation system for compensating for wave motions, which may comprise a combined hoisting and compensation cylinder.
  • the tower and the cylinder are mounted on deck.
  • the drilling machine is suspended from wires (so-called drill line), which run over guide pulleys at the top of the mast, via reversing pulleys at the top of the cylinder, to a fixed point at the top of the mast.
  • the drilling machine can therefore be hoisted up and down by moving the cylinder, and the cylinder also compensates - within certain tolerances - for the motions of the rig such that the drilling machine is kept as steady as possible when carrying out intervention operations.
  • a combined hoisting and compensation cylinder of this kind is capable of handling large loads, typically in the order of 250 tonnes.
  • This device is used, for example, when landing large weights on the seabed or inside the drilling riser, as well as during drilling, and can be operated in passive or active compensation mode when there is a need for greater accuracy and control of the compensation.
  • the prior art comprises WO 2007/145503 A1 , which describes a device and a method for heave compensation.
  • a mast is mounted on a floating vessel, a first compensation means that is attached via wire means on one side of the mast, and the other end of the wire means is further connected to a second heave compensation means attached to a tool unit for carrying out drilling operations.
  • the second heave compensation means and the tool unit are moved along guide rails in the mast with the aid of dollies/lever arms.
  • US 6.000.480 A discloses an arrangement comprising heave drilling, where the arrangement comprises a first frame-like structure which in relation to a floating vessel is mounted for allowing movement at least in the vertical direction in relation to said vessel, as well as devices for providing compensating power between said first frame stucture and said vessel.
  • the arrangement further comprises a second frame-like structure arranged stationary on a deck of the vessel, said first compensated frame-like structure and said second frame-like structure being assembled by means of a further system, allowing compensation of said relative movement between the vessel and said compensated structure, i.e. heave compensation both in relation to said vessel and said first frame structure.
  • WO 2007/044924 A2 discloses a rig assist compensation system, the system comprising a motion compensation unit operatively connected to a semi-submersible rig platform having a blow-out prevention (BOP) stack; a hydraulic workover jack rotatably affixed above the BOP stack, wherein the HWO jack includes a through-rotary portion, and a stationary portion; and a hydraulic motion compensator unit, positioned between the HWO jack and the BOP stack.
  • BOP blow-out prevention
  • the hydraulic motion compensator unit comprises a base frame having a plurality of base cylinders; an upper frame having a plurality of mating upper cylinders to engage the base cylinders in telescoping fashion, wherein the base frame and the upper frame are slidably connected, and are movable from an extended position and a retracted position.
  • a device for heave compensation of a tool unit which is suspended via one or more wire means in a mast mounted on a platform, each wire means at a first end being attached to the mast via an attachment and running via a first heave compensation unit, and each wire means at its other end being attached to a second heave compensation unit that is connected to the tool unit, characterised in that the second heave compensation unit comprises a movable compensation means which at its first end is attached to the wire means and which at its second end is attached to the tool unit, and that the second heave compensation unit comprises a releasable locking means with which the motions of the compensation means can selectively be prevented and allowed.
  • the compensation means is attached to the wire means via a connecting unit and is attached to the tool unit via a link element, the connecting unit and the link element being movable in relation to one another, and where the locking means is movable for selectively and releasably limiting the motions of the connecting unit and the link element in relation to one another.
  • the locking means comprises a locking bolt with a central, narrowed portion and broad shoulder portions at each end of the bolt.
  • the link element comprises a through hole having a first portion and a second portion, the first portion having a larger opening than the second portion.
  • the first portion has a dimension that allows passage of the shoulder portions whilst the second portion has a dimension that does not allow passage of the shoulder portions, but does allow passage of the central portion.
  • the first portion has a circular cross-section and the second portion is elongate.
  • the wire means runs between the second heave compensation unit and the first heave compensation unit via guide pulleys that are mounted at an upper part of the mast, and run via the first heave compensation unit between the guide pulleys and the attachment in the mast.
  • the first heave compensation unit is connected at a first end to the platform and at a second end is movably attached to said wire means via reversing pulleys and a cylinder.
  • the device comprises locking means with which the movements of the compensation units can selectively be prevented, and the compensation units transfer loads between the tool unit and the wire unit as substantially rigid bodies.
  • the first heave compensation unit functions as an active heave compensator whilst the second heave compensation unit functions as a passive heave compensator.
  • the second heave compensation unit is an integral part of the tool unit.
  • the first and second heave compensation units are preferably hydraulically operated.
  • the second heave compensation unit can quickly and simply be installed on any drilling machine, without structural modifications of the drilling machine.
  • Figure 1 shows a mast 1 located on a deck 2, for example, on an intervention rig or drilling rig (not shown).
  • An active heave compensation cylinder 7 and accumulator 8 and a combined hoisting and heave compensation cylinder 4 are mounted on the deck 2.
  • the heave compensation cylinder 4 is equipped at its upper end with reversing pulleys 5 for hoisting wires 6. It is usual to have four or six parallel running hoisting wires.
  • the combined hoisting and heave compensation cylinder 4 has a length of stroke d, where the cylinder rod 12 is in a fully extended position.
  • the fully retracted and extended positions, respectively, of the reversing pulleys are indicated by the reference numerals 5 and 5'.
  • the mast is constructed of a lattice structure in a known way, and will therefore not be described in more detail here.
  • the heave compensation units are driven by fluid reservoirs, regulating valves and systems, gas tanks and hydraulic power units. These components are well known to the skilled person and are therefore not referred to in more detail here.
  • the mast is equipped with guide rails 9 for a drilling machine 11 in a known way.
  • the wires 6 are connected to the upper part of the mast via an anchorage 10.
  • the wires 6 run from the anchorage 10 via the reversing pulleys 5 on the cylinder rod 12 of the combined hoisting and heave compensation cylinder 4, onward via guide pulleys 3 at the top of the mast and then down to a compensator 20, which is connected to the drilling machine 11.
  • Figure 2 shows the combined drilling machine 11 and compensator 20 in a lower position against the deck 2, whilst these units in Figure 3 are raised slightly from the deck.
  • the compensator 20 comprises two cylinders 22a,b that are directly connected between the drilling machine 11 and the connecting link 24 of the hoisting wires.
  • the hoisting wires (not shown in Figures 4a-c ) are connected to the connecting link 24 via suitable attachments 25.
  • Figure 4a further shows a dolly 21 attached to the drilling machine 11 for engagement with the tower guide rail as described above.
  • the cylinders 22a,b are equipped with a lock 23 with which the cylinders can be locked in the retracted position when the system is not in use.
  • the load from the drilling machine 11 is transferred to the lifting wires via the cylinders 22a,b and the connecting link 24.
  • Figures 4 a,b show the cylinders 22a,b in a retracted position
  • Figure 4c shows the cylinders 22a,b in a fully extended position
  • Figure 4d shows the cylinders 22a,b in a mid position.
  • the reference numeral 26 indicates the respective cylinder rods of the cylinders.
  • Fluid reservoirs and control units for the heave compensation cylinders 22a,b are in accordance with the prior art and are therefore not discussed in more detail here.
  • the compensator 20' comprises one cylinder 27 which is connected between the drilling machine 11 (via a link 29) and a connecting link 28 for the hoisting wires (only attachments 25 for the wires are shown in Figures 5b-d ).
  • Figure 5a further shows a dolly 21 attached to the drilling machine 11, for engagement with the tower guide rail as described above.
  • the cylinder 27 is equipped with lock 23 with which the cylinders can be locked in collapsed position when the compensator 20' is not in use.
  • the load from the drilling machine 11 is transferred to the hoisting wires via the cylinder 27 and the connecting link 28.
  • FIGS. 5a,b show the cylinder 27 in a retracted position
  • Figure 5c shows the cylinder 27 in a fully extended position
  • Figure 5d shows the cylinder 27 in a mid position.
  • the reference numeral 26 indicates the cylinder rod of the cylinder. Fluid reservoirs and control units for the heave compensation cylinder 27 are in accordance with the prior art and are therefore not discussed in more detail here.
  • the compensator 20" comprises one compensator cylinder 31 (also referred to as a motion damper) that is mounted to a connecting piece 32 for the hoisting wires.
  • Figures 6a and 6b further show a dolly 21 attached to the drilling machine 11, for engagement with the tower guide rail as described above.
  • a lock 30 (which, for example, is hydraulically operated via an actuator 86) that is capable of connecting together the connecting piece 32 and the below-lying link element 33 from which the drilling machine 11 is suspended.
  • the lock 30 bears all load when it is in the locked position and the compensator 20" is not in use, such that the load from the drilling machine 11 is transferred to the hoisting wires via the link element 33, the hydraulically operated lock 30 and the connecting piece 32.
  • Figures 6a,b show such a locked position, in which the cylinder 31 is in a retracted position and is inactive.
  • Fluid reservoirs and control units for the compensation cylinder 31 are in accordance with the prior art and are therefore not discussed in more detail here.
  • FIGS 7a to 10c are further illustrations of the compensator cylinder 31, the connecting piece 32, the link element 33 and the connection between these components in different configurations.
  • the connecting piece 32 to which the compensator cylinder 31 and the wires 6 are fastened, comprise two plate elements 32a,b arranged spaced apart and fastened together by means of upper bolts 81 and lower bolts 83.
  • the lock 30 comprises a housing 30' with a locking bolt 87, a locking bolt cylinder 88 and a position sensor 89 for the locking bolt.
  • the locking bolt 87 has a central narrowed portion 87b, and broad portions (flanges) 87a at each end.
  • the link element 33 also has a plate form, and is disposed between the plate elements 32a,b of the connecting piece in such a way as to be movable.
  • the cylinder rod 26 of the compensator cylinder 31 (whose housing is fastened to the connecting piece) is secured to the link element 33 via a fastening bolt 84.
  • the link element 33 is provided with a through "keyhole" 82, which is adapted for receiving the locking bolt 87.
  • the keyhole 82 is elongate and has a lower portion 82a that has a larger opening than the above-lying, slightly narrower portion 82b of the keyhole.
  • the broad end portions 87a of the locking bolt 87 have a cross-sectional dimension that allows passage through the lower, broad portion 82a of the keyhole and into the respective support holes 37 in the side plates 32a,b, but does not allow passage through the above-lying portion 82b.
  • the central, narrowed portion 87b of the locking bolt has a cross-sectional dimension that allows movement of the locking bolt up and down in the keyhole, also in the slightly narrower portion 82b.
  • Figures 7a-e show an unlocked state.
  • the locking bolt 87 has been fully withdrawn from the keyhole 82 in the link element 33, thereby allowing the link element 33 to move between the two side plates 32a,b in the connecting piece 32.
  • the link element 33 which is connected to the compensator cylinder 31 via the cylinder rod 26, can move between a lower position (as shown) and an upper position, limited by, respectively, the upper shoulders 85 and lower shoulders 90 and the lower (stop) bolts 83.
  • the figures show that when the link element 33 is in the full lower position, it will rest on the two lower bolts 83 via the shoulders 85, which will prevent the drilling machine from falling if the compensator cylinder 31 should fail.
  • the cylinder stroke is reduced to about half stroke (compared with that shown in Figures 7a-d ), the system will be in the position for motion damping.
  • Figures 8a-e show a locked stated wherein the motion damper 31 is not in use.
  • the system is locked, such that all load passes through the locking bolt without affecting the motion damper.
  • the load is suspended from the drilling machine (not shown) and is transferred to the link element 33.
  • the link element 33 is suspended from the locking bolt 87 that is seated in holes in the side plates 32a,b of the connecting piece 32. From the locking bolt 87, the load passes through these two side plates up to the upper bolts 81, which connect the hoisting wires to the connecting piece 32. This is a normal configuration of the suspension system for drilling and lifting/lowering the drill string.
  • Figures 9a-c show a state in which the lower link element 33 has been lifted up to a maximum height in the keyhole 82, such that the locking bolt shoulders 87a and the broad portion 82a of the keyhole are aligned with one another. This is the only position in which it is possible to pull the locking bolt 87 out of the keyhole 82.
  • the locking bolt is moved (pulled) horizontally by means of a cylinder 88 equipped with a stroke sensor 89 such that there is control of whether the bolt is in lockable engagement with the keyhole or not. This lifting of the link element 33 is done with the aid of the compensator cylinder 31.
  • Figures 9a-c also show that the lower dimension (diameter) of the keyhole is so great that the locking bolt can be moved horizontally through the keyhole.
  • the locking bolt In the upper, narrower part of the keyhole, it is not possible to move the locking bolt in a horizontal direction owing to the shoulders having increased diameter at the ends. However, the locking bolt is free to be moved vertically in the keyhole, throughout the length of the keyhole.
  • the sectional view in Figure 9c shows the locking bolt half out of engagement. It can be seen that the locking bolt has a shoulder 87a with a larger diameter at both ends than the diameter of the central portion 87b. The diameter of the shoulders fits in the supporting holes 37 of the connecting piece 32 and the lower part 82a of the keyhole in the link element.
  • Figures 10a-c shows a state in which the locking bolt 87 is locked, but the damping cylinder 31 (not shown in Figures 10a-c ) is actuated with a small stroke such that the locking bolt is roughly in the middle of the keyhole 82. This is a position for weight reduction on screwing together the drilling machine and the drill string, a so-called “thread-saver” function.
  • the task of the compensator 21" is to hold tool that has been lowered into the well in an accurate position without subjecting equipment installed in the well to weights greater than typically +/- 500 kg whilst the main heave compensation is in progress with the aid of the combined hoisting and heave compensation cylinder 4, with associated accumulator tanks and other necessary, known equipment (not shown).
  • the compensator 21" with compensation cylinder 31 takes the "peaks" of the damping from the main compensator 4.
  • the compensator 21" may thus have at least the following two functions:
  • the compensator 21" is described here as being made up of a lower link element 33 that is movably arranged between the two side plates 32a,b of the connecting piece 32, the invention should not be limited to such designs, as a variant may be an inverted configuration where the lower link element has two side plates and the connecting piece comprises one element that is movably arranged therebetween.
  • the invention should also not be limited to plate-shaped elements.
  • the combined hoisting and heave compensation cylinder 4 and associated components are used when landing large loads on the seabed or inside the drilling riser, and during drilling. In such situations, the compensator 20; 20'; 20" is not necessarily in use, i.e., the cylinders are locked via their respective locking mechanisms 23; 30.
  • Stage 1 can be operated in passive compensation mode or in active compensation mode.
  • Stage 1 will be operated in active compensation mode. Stage 1 will therefore be able to achieve heave compensation down to a certain minimum level.
  • the compensator 20; 20'; 20" (in the following also referred to as Stage 2) is used together with Stage 1 in order to further increase sensitivity and accuracy, and to ensure that the power of the drilling machine does not exceed a defined minimum value.
  • Stage 2 then functions as a passive heave compensator.
  • the compensator in Stage 2 which may have a relatively short stroke length, is constructed such that the cylinder piston is held stationary until loaded with a predefined weight. When such a predefined weight has been reached, the compensator in Stage 2 will compensate by either retracting or extending the cylinder rod 26.
  • Examples of situations in which the need for a Stage 2 is present include landing of lighter equipment within the casing and subsea safety valves.
  • a two-stage heave compensator of this kind can thus - very accurately - compensate for the motions of the rig.
  • Stage 1 and Stage 2 in combination can compensate for a relatively small weight change and obtain major positioning accuracy at a limited speed.
  • a combined hoisting and compensation cylinder can typically handle loads of the order of 250 tonnes.
  • a relatively small weight change may be of the order of ⁇ 500 kg, and the positioning accuracy can be of the order of ⁇ 10 cm.
  • Stage 1 can handle large loads and most of the heave.
  • the compensator 20; 20'; 20" (Stage 2) is however substantially smaller than Stage 1 and thus generates less packing friction.
  • the compensator in Stage 2 is located on top of the drilling machine 11 such that it does not take with it other friction than that in the compensator 20; 20'; 20", and possibly some from the well.
  • the compensator 20; 20'; 20" is thus able to reduce the load amplitude from Stage 1 to a load oscillation that is within the requirement for weight change compensation.
  • the device according to the invention functions in this way as a two-stage heave compensator, where the combined hoisting and heave compensation cylinder 4 (Stage 1) handles the large loads, whilst the compensator 20; 20'; 20" (Stage 2, which has better sensitivity and greater accuracy) is able to compensate for loads that are smaller than Stage 1 is adapted to compensate for.
  • the load for which the compensator 20; 20'; 20" is designed to compensate may be of the order of 8-10% of the load capacity of the hoisting system.
  • the device for heave compensation can be used for purposes other than well intervention.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)

Claims (10)

  1. Dispositif de compensation de tangage d'une unité d'outil (11) qui est suspendue via un ou plusieurs moyens de fil métallique (6) à un mât (1) monté sur une plateforme (2), chaque moyen de fil métallique, au niveau d'une première extrémité, étant fixé au mât via une fixation (10) et s'étendant, via une première unité de compensation de tangage (4, 5, 12), et chaque moyen de fil métallique (6), au niveau de sa seconde extrémité, étant fixé à une seconde unité de compensation de tangage (20 ; 20' ; 20") qui est raccordée à l'unité d'outil,
    caractérisé en ce que
    la seconde unité de compensation de tangage (20' ; 20") comprend un moyen de compensation mobile (31) qui, au niveau de sa première extrémité, est fixé au moyen de fil métallique (6) et qui, au niveau de sa seconde extrémité, est fixé à l'unité d'outil (11), et en ce que la seconde unité de compensation de tangage comprend un moyen de verrouillage (30) amovible avec lequel les mouvements du moyen de compensation (31) peuvent être sélectivement empêchés et autorisés.
  2. Dispositif selon la revendication 1, dans lequel le moyen de compensation (31) est fixé à un moyen de fil métallique (6) via une unité de raccordement (32) et est fixé à l'unité d'outil (11) via un élément de liaison (33), et dans lequel l'unité de raccordement (32) et l'élément de liaison (33) sont mobiles l'un par rapport à l'autre, et dans lequel le moyen de verrouillage (30) est mobile pour limiter, de manière sélective et séparable, les mouvements de l'unité de raccordement (32) et de l'élément de liaison (33) l'un par rapport à l'autre.
  3. Dispositif selon la revendication 2, dans lequel le moyen de verrouillage (30) comprend un boulon de verrouillage (87) avec une partie centrale étroite (87b) et de larges parties d'épaulement (87a) au niveau de chaque extrémité du boulon.
  4. Dispositif selon la revendication 2 ou la revendication 3, dans lequel l'élément de liaison (33) comprend un trou débouchant (82) avec une première partie (82a) et une seconde partie (82b), la première partie ayant une plus grande ouverture que la seconde partie.
  5. Dispositif selon la revendication 4, dans lequel la première partie (82a) a une dimension qui permet le passage des parties d'épaulement (87a) alors que la seconde partie (82b) a une dimension qui ne permet pas le passage des parties d'épaulement mais permet le passage de la partie centrale (87b).
  6. Dispositif selon la revendication 4 ou la revendication 5, dans lequel la première partie (82a) a une section transversale circulaire et la seconde partie (82b) est allongée.
  7. Dispositif selon la revendication 1, dans lequel ledit moyen de fil métallique, entre la seconde unité de compensation de tangage et la première unité de compensation de tangage, s'étend via des poulies de guidage (3) qui sont montées au niveau d'une partie supérieure du mât, et s'étendent via la première unité de compensation de tangage entre les poulies de guidage et la fixation dans le mât.
  8. Dispositif selon la revendication 1 ou la revendication 2, dans lequel la première unité de compensation de tangage est raccordée, au niveau d'une première extrémité, à la plateforme et au niveau d'une seconde extrémité, est fixée de manière mobile audit moyen de fil métallique via des poulies d'inversion (5) et d'un cylindre (4, 12).
  9. Dispositif selon l'une quelconque des revendications précédentes, comprenant un moyen de verrouillage (23) avec lequel les mouvements des unités de compensation (22a, b ; 27) peuvent être sélectivement empêchés, et les unités de compensation transfèrent les charges entre l'unité d'outil et le moyen de fil métallique sous forme de corps sensiblement rigides.
  10. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la première unité de compensation de tangage (4, 5, 12) fonctionne comme un compensateur de tangage actif alors que la seconde unité de compensation de tangage (20 ; 20' ; 20") fonctionne comme un compensateur de tangage passif.
EP12791258.2A 2011-10-11 2012-10-11 Mécanisme de verrouillage Active EP2748404B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20111377A NO20111377A1 (no) 2011-10-11 2011-10-11 Anordning for hivkompensering
PCT/IB2012/055494 WO2013054274A2 (fr) 2011-10-11 2012-10-11 Mécanisme de verrouillage

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EP2748404A2 EP2748404A2 (fr) 2014-07-02
EP2748404B1 true EP2748404B1 (fr) 2015-06-24

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US (1) US20140238685A1 (fr)
EP (1) EP2748404B1 (fr)
KR (1) KR20140088143A (fr)
CN (1) CN103874823B (fr)
AU (1) AU2012322312A1 (fr)
BR (1) BR112014008505A2 (fr)
CA (1) CA2849272A1 (fr)
NO (1) NO20111377A1 (fr)
WO (1) WO2013054274A2 (fr)

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KR20170035184A (ko) 2015-09-22 2017-03-30 유니트러스트개발(주) 연결블록을 구비한 블록 조립 완구
CN106939771B (zh) * 2017-02-24 2019-01-11 中建钢构有限公司 一种升沉补偿系统用锁止装置
NO345743B1 (en) 2017-05-19 2021-07-12 AME Pty Ltd Compensated elevator link
KR200485228Y1 (ko) 2017-07-31 2018-01-18 유니트러스트개발(주) 연결블록을 구비한 블록 조립 완구

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US8162062B1 (en) * 2008-08-28 2012-04-24 Stingray Offshore Solutions, LLC Offshore well intervention lift frame and method
US8997888B2 (en) * 2009-09-18 2015-04-07 Itrec B.V. Hoisting device

Also Published As

Publication number Publication date
CN103874823B (zh) 2016-01-20
US20140238685A1 (en) 2014-08-28
WO2013054274A2 (fr) 2013-04-18
CN103874823A (zh) 2014-06-18
NO20111377A1 (no) 2013-04-12
AU2012322312A1 (en) 2014-03-27
EP2748404A2 (fr) 2014-07-02
CA2849272A1 (fr) 2013-04-18
WO2013054274A3 (fr) 2014-02-13
KR20140088143A (ko) 2014-07-09
BR112014008505A2 (pt) 2017-04-25

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