DK154697B - PROCEDURE FOR TRANSFERING A WORKING PLATFORM FROM A SWIMMING POSITION TO A SURROUNDING SURFACE HAVE GIVEN POSITION AND WORKING PLATFORM TO EXERCISE THE PROCEDURE - Google Patents
PROCEDURE FOR TRANSFERING A WORKING PLATFORM FROM A SWIMMING POSITION TO A SURROUNDING SURFACE HAVE GIVEN POSITION AND WORKING PLATFORM TO EXERCISE THE PROCEDURE Download PDFInfo
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- DK154697B DK154697B DK610174AA DK610174A DK154697B DK 154697 B DK154697 B DK 154697B DK 610174A A DK610174A A DK 610174AA DK 610174 A DK610174 A DK 610174A DK 154697 B DK154697 B DK 154697B
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- 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
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- 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
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Description
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Opfindelsen vedrører en fremgangsmåde til overføring af en arbejdsplatform med lodret nedadbevæge-lige støtteben, der bærer platformen, når de står på bunden, fra en svømmende stilling til en over 5 vandoverfladen hævet stilling, under anvendelse af i forhold til arbejdsplatformen bevægelige opdriftslegemer, der under overføringen neddykkes til frembringelse af yderligere opdrift. Opfindelsen vedrører også en arbejdsplatform til udøvelse af fremgangsmåden.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a method of transferring a working platform with vertical downwardly moving support legs, which carry the platform when standing on the bottom, from a swimming position to a position raised above the water surface, using buoyant movable bodies which are movable relative to the work platform. the transfer is submerged to produce further buoyancy. The invention also relates to a working platform for practicing the method.
10 Til udnyttelse af undersøiske oliefelter og til lignende formål anvendes boreplatforme eller boreskibe, der har i forhold til platformens eller skibets skrog lodret bevægelige støtteben. På borestedet føres disse ben helt ned til havbunden, hvorefter bore- eller 15 arbejdsplatformen løftes ud af vandet på de faststående støtteben, således at platformen, der er indrettet til at flyde på vandet, indtager en stilling, der er uafhængig af bølger og strøm.10 For the exploitation of subsea oil fields and similar purposes, drilling platforms or drilling vessels having vertical movable support legs of the platform or ship are used. At the drilling site, these legs are brought all the way down to the seabed, after which the drilling or working platform is lifted out of the water on the fixed support legs, so that the platform adapted to float on the water occupies a position that is independent of waves and current.
De bevægelige støtteben bliver imidlertid ofte 20 beskadiget, når de som følge af søgangen støder mod havbunden, og dette sker endda i forholdvis roligt vand, dvs. ved bølger fra 0,9-1,5 m højde. I havområder som f.eks. Golfen ved Alaska eller Nordsøen er bølgehøjden sjældent under sikkerhedsgrænsen for overfø-25 ringen af arbejdsplatformens vægt fra stillingen, hvor den flyder på vandet, til stillingen, hvor den bæres af støttebenene, hvilket ligeledes gælder for det omvendte forløb, når arbejdsplatformen skal flyttes. Man har hidtil forsøgt at elminere disse vanskeligheder ved 30 altid ved sådanne manøvre at vente, til søen er rolig, hvilket er en forholdsvis dyr fremgangsmåde.However, the movable support legs are often damaged when they hit the seabed as a result of the sea, and this occurs even in relatively calm water, ie. at waves from 0.9-1.5 m altitude. In marine areas such as The Gulf of Alaska or the North Sea is the wave height rarely below the safety threshold for transferring the weight of the work platform from the position where it floats on the water to the position where it is carried by the support legs, which also applies to the reverse course when the work platform is to be moved. So far, attempts have been made to eliminate these difficulties by always waiting for such maneuvers until the lake is calm, which is a relatively expensive approach.
Fra fransk patentskrift nr. 1 468 413 kendes en fremgangsmåde af den ovenfor angivne art, der søger at undgå de under placeringen af en flydende arbejds-35 platform optrædende farer ved, at platformen, der er udrustet med støtteben, der kan bevæges nedad lige til 2French Patent Specification No. 1,468,413 discloses a method of the kind set forth above which seeks to avoid the dangers arising during the placement of a floating working platform by the platform provided with support legs which can be moved downward straight to the 2
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havbunden, forankres på borestedet, og at der derefter indstilles en bestemt dybgang for arbejdsplatformen ved hensigtsmæssig trimning af ballasttanke, hvorefter de i forhold til arbejdsplatformen bevægelige støtteben 5 føres ned til bunden, hvorved arbejdsplatformens relative bevægelighed i forhold til støttebenene opretholdes. Denne kendte arbejdsplatform har yderligere, ligeledes i vandet neddykkelige opdriftslegemer, der efter neddykningen sørger for, at arbejdsplatformen 10 flyder op langs de nu faststående støtteben, idet disse yderligere opdriftslegemer giver arbejdsplatformen en sådan opdrift, at opdriftsplatformen eller boreskibet er forholdsvis letbevægeligt i lodret retning. Så snart arbejdsplatformen befinder sig i højde med en bølgekam, 15 skal den fastgøres på støttebenene. Samtidig hermed skal de indretninger, der holder opdriftslegemer i vandet i fast forbindelse med arbejdsplatformen udløses, således at opdriftslegemerne derefter ikke mere indvirker på arbejdsplatformen. Med henblik på dette er 20 opdriftslegemerne fastgjort til udliggere, der via wirer eller lignende kan bevæges og i forhold til arbejdsplatformen kan placeres i neddykket eller uddykket stilling.the seabed, is anchored at the drilling site, and then a certain draft is set for the work platform by appropriate trimming of ballast tanks, after which the support legs 5 movable relative to the work platform are lowered to the bottom, thus maintaining the relative mobility of the work platform relative to the support legs. This known working platform has further, also submerged buoyancy bodies, which after dive ensure that the working platform 10 floats up along the now fixed support legs, these additional buoyancy bodies giving the working platform such a buoyancy that the buoyancy platform or drilling vessel is relatively easily movable in the vertical direction. As soon as the work platform is at the height of a crest, it must be secured to the support legs. At the same time, the devices that hold buoyancy bodies in the water in fixed connection with the work platform must be released, so that the buoyancy bodies then no longer affect the working platform. To this end, the 20 buoyancy bodies are attached to outriggers which can be moved via wires or the like and can be placed in a submerged or extended position relative to the work platform.
Udøvelse af denne kendte fremgangsmåde kræver 25 betydelig dygtighed og stor omhyggelighed. Trods dette udgør søgangen en betydelig fare i den tid, under hvilken støtterne allerede er placeret på havbunden, men hvor arbejdsplatformen endnu ikke er bevægelig i lodret retning i forhold til støttebenene. Ligeledes er 30 støttebenene stadig udsat for fare, medens de sættes ned på havbunden.Practicing this known method requires considerable skill and great care. In spite of this, the seabed poses a considerable danger during the time during which the supports are already placed on the seabed, but where the working platform is not yet movable in a vertical direction relative to the support legs. Likewise, the 30 outriggers are still at risk while being lowered to the seabed.
Det er derfor opfindelsens opgave at tilvejebringe en forbedret fremgangsmåde af den i indledningen angivne art, i hvilken faremomenterne for arbejds-35 platformen omfattende støttebenene er væsentlig formindsket i forhold til den kendte fremgangsmåde under 3It is therefore the object of the invention to provide an improved method of the kind set forth in the preamble in which the hazards of the working platform comprising the support legs are substantially diminished in comparison with the known method under 3
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fastgørelsen af arbejdsplatformen og løftningen af denne op fra vandet, og omvendt når platformen skal føres tilbage til tilstanden, hvor den flyder på vandet. Disse forløb skal især også kunne udføres, når 5 bølgegangen ligger over sikkerhedsgrænsen på fra 0,9- 1,5 m. Denne opgave løses ifølge opfindelsen ved en fremgangsmåde af den i indledningen angivne art, der er ejendommelig ved, at opdriftslegemerne først bevæges nedad, så arbejdsplatformens samlede vægt bæres af 10 opdriftslegemerne, der holdes mellem og i afstand fra vandoverfladen og havbunden, hvorved arbejdsplatformen løftes ud af vandet, hvorefter støttebenene bringes i berøring med havbunden, og arbejdsplatformens vægt overføres fra opdriftslegemerne til støttebenene.attaching the work platform and lifting it up from the water, and vice versa when the platform needs to be returned to the state where it floats on the water. In particular, these processes can also be carried out when the wave transition exceeds the safety limit of from 0.9 to 1.5 m. This task is solved according to the invention by a method of the kind specified in the introduction, which is peculiar in that the buoyant bodies are first moved downwards so that the total weight of the work platform is carried by the 10 buoyancy bodies which are kept between and away from the water surface and the sea floor, whereby the work platform is lifted out of the water, after which the support legs are brought into contact with the sea floor and the work platform weight is transferred from the buoyancy bodies to the support legs.
15 I modsætning til den kendte teknik løftes arbejdsplatformen ved denne fremgangsmåde først ud af vandet og dermed ud af bølgegangens indflydelsesområde ved hjælp af opdriftslegemer, der neddykkes i vandet.15 Contrary to the prior art, the working platform in this method is first lifted out of the water and thus out of the wave's area of influence by buoyancy bodies immersed in the water.
Først derefter bliver arbejdsplatformens vægt overført 20 til støttebenene, der i mellemtiden er blevet bevæget nedad. Dette kan mere detaljeret ske ved, at støttebenene først under ballast bevæges ned i nærheden af havbunden og derefter gives en yderligere opdrift, og at opdriftslegemerne, efter at arbejdsplatformen eller 25 boreskibet er blevet løftet ud af vandet, forsynes med ballast til overføring af vægten til støttebenene. Opdriftslegemerne kan yderligere efter overføring af arbejdsplatformens vægt til støttebenene tages ud af vandet. Ved denne fremgangsmåde bliver den af søgangen 30 forårsagede bevægelse af arbejdsplatformen yderst be-skrænket, da de bølgebetingede svingninger af vandoverfladen kun bevirker, at et forholdsmæssigt lille vandfortrængningsvolumen bevæges op og ned i det øverste område af opdriftslegemet og dermed kun medfø-35 rer en tilsvarende lille ændring af opdriftskraften og således kun en lille bevægelse af arbejdsplatformen og 4Only then will the weight of the work platform be transferred 20 to the support legs, which in the meanwhile have been moved downwards. This can be done in more detail by first moving the support legs under the ballast near the seabed and then providing a further buoyancy, and that the buoyancy bodies, after the work platform or drilling vessel has been lifted out of the water, are provided with ballast for transferring the weight to support legs. The buoyancy bodies can be further removed from the water after transferring the weight of the work platform to the support legs. In this method, the movement of the working platform caused by the seaway 30 is extremely restricted, since the wave-related oscillations of the water surface only cause a relatively small water displacement volume to move up and down in the upper region of the buoyancy body and thus only result in a corresponding little change in buoyancy and thus only a slight movement of the work platform and 4
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støttebenene. Såfremt den samme bølgebevægelse angreb et på vandoverfladen flydende skibsskrog, ville der optræde væsentlig større opdriftsændringer og derfor tilsvarende større bevægelser af skibsskroget og de i 5 givet fald med dette forbundne støtteben.support legs. If the same wave motion attacked a ship's hull floating on the water surface, substantially larger buoyancy changes would occur and therefore correspondingly greater movements of the ship's hull and the associated support legs, if any.
Når støttebenene skal trænge dybere ind i havbunden med henblik på en yderligere sikring af arbejdsplatformen, kan opdriftslegemerne, der er taget op af vandet, forsynes med ballast for derved at 10 muliggøre en kraftigere belastning af støttebenene og dermed en indtrængning i havbunden. F.eks. kan der på denne måde placeres en nedadrettet kraft på støttebenene, der svarer til den dobbelte totalvægt af anlægget.When the outriggers need to penetrate deeper into the seabed for further securing of the work platform, the buoyancy bodies taken up by the water can be provided with ballast, thereby enabling a stronger load on the outriggers and thus penetration into the seabed. Eg. In this way, a downward force can be placed on the support legs corresponding to the double total weight of the system.
Ved flytning af arbejdsplatformen føres op-15 driftslegemerne nedad, indtil de er i en sikker afstand fra havbunden og fastgøres, og tømmes derefter for ballst, så de kan løfte platformen og støttebenene. Når støttebenene står på fast bund, kan de let løftes igen, eventuelt ved hjælp af en konventionel vandtrykvakuum-20 bryder under støtterne. Når det derimod er nødvendigt med en kraft til at hæve platformen igen som følge af, at støttebenene er trængt dybere ned, hvilken kraft overstiger den maksimale løftekraft fra opdriftslegemerne og fra vand-vakuumbrydertrykket, kan også op-25 driften på arbejdsplatformens krop udnyttes for at løsne støttebenene, der er trængt ned i havbunden, uden at støttebenene trækkes ud af hullerne i bunden. Derefter løftes arbejdsplatformens krop ud af vandet, idet den bæres af opdriftslegemerne, således at støt-30 terne kan hæves, så de er fri af bunden.When moving the work platform, the operating bodies are moved downwards until they are at a safe distance from the seabed and secured, and then emptied of ballast so that they can lift the platform and the support legs. When the support legs are firmly fixed, they can be easily lifted again, possibly by means of a conventional water pressure vacuum breaker under the supports. On the other hand, when a force is needed to raise the platform again as the support legs are lowered, which exceeds the maximum lifting force from the buoyancy bodies and from the water-vacuum breaker pressure, the operation of the work platform body can also be utilized to loosen the support legs that have penetrated into the seabed without pulling the support legs out of the holes in the bottom. Then the body of the work platform is lifted out of the water, carried by the buoyancy bodies, so that the supports can be raised so that they are free of the bottom.
Foretrukne yderligere udførelsesformer af fremgangsmåden ifølge opfindelsen er angivet i krav 2 og 3, og en til udøvelse af fremgangsmåden tjenende arbejds-platform er angivet i krav 4 og 5.Preferred additional embodiments of the method of the invention are set forth in claims 2 and 3, and a working platform serving the method is set forth in claims 4 and 5.
35 Opfindelsen vil nu blive forklaret nærmere ved hjælp af et eksempel på en udførelsesform og med henvisning til tegningen, på hvilken 5The invention will now be explained in more detail with the aid of an example of an embodiment and with reference to the drawing, in which
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fig. 1 er et sidebillede af en arbejdsplatform til udøvelse af fremgangsmåden ifølge opfindelsen, fig. 2 et planbillede af arbejdsplatformen i fig. 1, 5 fig. 3-7 successive faser under opstilling af arbejdsplatformen i fig. 1, og fig. 8 et perspektivbillede af arbejdsplatformen i fig. 1, inklusive styreledninger og styreindretninger.FIG. 1 is a side view of a working platform for practicing the method of the invention; FIG. 2 is a plan view of the working platform of FIG. 1, 5 FIG. 3-7 successive phases in setting up the work platform of FIG. 1, and FIG. 8 is a perspective view of the working platform of FIG. 1, including control cables and control devices.
10 Som vist i fig. 1 bærer en arbejdsplatform 50 på et dæk 51 et boreudstyr, således at dækket 51 derved danner en boreplatform 59, som vist i fig. 4.10 As shown in FIG. 1, a working platform 50 on a tire 51 carries a drilling equipment, so that the tire 51 thereby forms a drilling platform 59, as shown in FIG. 4th
Her er kun vist et boretårn 52 i stuvet stilling. Den samlede vægt af arbejdsplatformen 50 omfatter vægten 15 af platformsdækket 59, af de bevægelige støtteben 56, af de halvt neddykkelige opdriftslegemer 57 og af det øvrige udstyr på eller i platformens skrog eller krop.Only a drill tower 52 in the stowed position is shown here. The total weight of the working platform 50 includes the weight 15 of the platform tire 59, of the movable support legs 56, of the semi-submersible buoyancy bodies 57, and of the other equipment on or in the hull or body of the platform.
Gennem kroppen eller skroget 53, der kan flyde, og gennem dækket 51 går som vist i fig. 1 og 2 20 bøsningslignende styr 55, af hvilke en første gruppe optager støttebenene 56, og en anden gruppe optager de halvt neddykkelige opdriftslegemer 57. Styrene 55 er elementer i form af rør, der er fremstillet af stål eller andre materialer, og som er svejst til skroget 25 53 eller fastgjort på anden måde. Opdriftslegemerne 57 med indstillelig, styrbar opdrift er hule, vandtætte byggeelementer, der kan opnå tilstrækkelig opdrift til at kunne løfte arbejdsplatformen 50 ud af vandet eller som modsat kan forsynes med ballast, således at 30 de synker ned i vandet. Opdriftselementerne 57 har form af en cylinder med lukket ende, hvorved den ende 66, der først dykker ned i vandet, er forøget, så den har form af en stor cylinder 57, der er koncentrisk med en mindre, øvre cylinder 68, og som er fast 35 forbundet med denne som vist i fig. 3.Through the body or hull 53 which can flow, and through the tire 51, as shown in FIG. 1 and 2 20 bush-like guides 55, of which a first group receives the support legs 56 and a second group accommodates the semi-submersible buoyancy bodies 57. The guides 55 are elements in the form of tubes made of steel or other materials and which are welded to the hull 25 53 or otherwise attached. The buoyancy bodies 57 with adjustable, controllable buoyancy are hollow, watertight building elements that can achieve sufficient buoyancy to be able to lift the work platform 50 out of the water or, as opposed to ballast, so as to sink into the water. The buoyancy elements 57 are in the form of a closed end cylinder, whereby the end 66 which first dives into the water is increased to form a large cylinder 57 concentric with a smaller upper cylinder 68 which is solid 35 connected thereto as shown in FIG. Third
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e Når opdriftslegemerne 57 og støttebenene 56 er i den indtrukne stilling som vist i fig. 1, kan arbejdsplatformen 50 slæbes i søen fra ét sted til et andet, eller den sejle ved egen kraft. Når et borested 5 nås, nedsænkes de bevægelige støtteben så langt som muligt, efter at de, hvis nødvendigt, er blevet forsynet med ballast, uden at man løber en fare for, at de vil kunne berøre havbunden som følge af skrogets bevægelse (fig. 3), og de fastgøres i denne stilling 10 for at få en optimal stabilitet af skroget, medens arbejdsplatformen ved hjælp af opdriftslegemerne 57 løftes op over vandoverfladen og fastholdes der.e When the buoyancy bodies 57 and the support legs 56 are in the retracted position as shown in FIG. 1, the working platform 50 can be towed in the lake from one place to another, or it can sail by its own power. When a drilling site 5 is reached, the movable support legs are lowered as far as possible after they have been provided with ballast, if necessary, without running the risk of being able to touch the seabed as a result of the hull movement (fig. 3) and are secured in this position 10 for optimum stability of the hull while the work platform is lifted up by the buoyancy bodies 57 above the water surface and retained there.
Opdriftslegemerne 57 neddykkes styret ved, at de forsynes med ballast, eller ved at de trykkes ned 15 eller ved en kombination af begge metoder og fastgøres derefter som vist i fig. 3. En løfte- og fastgørelsesmekanisme 58, der tillader en styrbar bevægelse gennem det andet sæt styr 55, er opbygget konventionelt og arbejder enten mekanisk, hydraulisk eller pneumatisk 20 eller med en kombination af disse teknikker. Fig. 8 viser skematisk arrangementet af en styrepult 60, en energikilde 64 og ledninger 61. I denne nedsænkede stilling, der er vist i fig. 4, gives opdriftslegemerne 57 opdrift ved, at de blæses ud eller på anden, 25 tilsvarende måde. Opdriften bevirker som vist i fig. 4, at skroget 53 løfter sig ud af vandet. I den nye stilling bliver skroget 53 til en platform 59, der kun bæres af opdriftslegemerne 57, såfremt de delvis nedsænkede støtteben 56 ikke også forsynes med 30 opdrift. I denne løftede stilling er platformen 59 udsat for mindre opad- og nedadgående bevægelse, rulning og duvning, end hvis den flød på vandoverfladen. Som følge af dette bliver overgangen fra understøtning som følge af opdriften fra opdriftslegemerne 35 57 til tilstanden, hvor platformen bæres af støttebe nene 56, der står på bunden, eller en overgang fraThe buoyancy bodies 57 are submerged guided by providing ballast or by depressing 15 or by a combination of both methods and then being secured as shown in FIG. 3. A lifting and fastening mechanism 58 which permits controllable movement through the second set of guides 55 is conventionally constructed and operates either mechanically, hydraulically or pneumatically or by a combination of these techniques. FIG. 8 schematically shows the arrangement of a control desk 60, an energy source 64 and wires 61. In this submerged position shown in FIG. 4, buoyancy bodies 57 are buoyed by being blown out or otherwise, 25 in a similar manner. The buoyancy effect as shown in FIG. 4, that the hull 53 lifts out of the water. In the new position, the hull 53 becomes a platform 59 carried only by the buoyancy bodies 57 if the partially submerged support legs 56 are not also provided with 30 buoyancy. In this raised position, the platform 59 is subject to less upward and downward movement, rolling and pushing than if it was flowing on the water surface. As a result, the transition from support due to buoyancy from buoyancy bodies 35 57 to the state where the platform is supported by the support legs 56, which are on the bottom, or a transition from
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7 støttebenene til understøtning ved hjælp af opdriften, sikker, og uden at der sker en beskadigelse af støttebenene 56, selv ved kraftig sø. Den højde, til hvilken skroget 53 løftes over vandoverfladen, be-5 stemmes af de sandsynlige bølgehøjder, der forudsiges for den skønnede varighed af arbejdet på borestedet, idet en bølgepåvirkning på skroget 53 vil kunne forårsage store skader. I roligt farvand kan denne afstand være blot 3 m eller mindre. I urolige farvande, 10 som f.eks. Nordsøen, kan afstanden være 9 m eller mere over vandoverfladen.. I alle tilfælde vil en forsigtig operatør løfte skroget 53 i sikkerhed op over de højeste bølger, der vil kunne forventes på borestedet under den skønnede varighed for borearbejdet.7 the support legs for support by the buoyancy, safe and without damage to the support legs 56, even in heavy seas. The height to which the hull 53 is raised above the water surface is determined by the probable wave heights predicted for the estimated duration of work at the drilling site, as a wave effect on the hull 53 could cause major damage. In calm waters this distance can be just 3 m or less. In troubled waters, such as In the North Sea, the distance may be 9 m or more above the water surface. In all cases, a cautious operator will lift the hull 53 safely above the highest waves expected at the drilling site for the estimated duration of the drilling work.
15 Derefter frigøres støttebenene 56 fra deres delvis nedsænkede stilling, de sænkes helt ned eller sættes på bunden i en stilling som vist i fig. 5, og fastgøres. Samtidig sker der en forsøgsvis aflastning af opdriftslegemerne 57 for at fastslå, om et af 20 støttebenene står på en blød eller let sammentrykkelig bund, hvad der ville kræve en yderligere nedsænkning af det pågældende ben; når dette ikke er tilfældet, bliver opdriftslegemerne 57 trukket helt op, fastgjort og forsynet med ballst i nødvendig grad for at drive 25 benene 56 ned og/eller at. afprøve disse under last.Thereafter, the support legs 56 are released from their partially submerged position, they are lowered completely or placed on the bottom in a position as shown in FIG. 5, and attached. At the same time, there is an experimental relief of buoyancy bodies 57 to determine if one of the 20 support legs is on a soft or easily compressible bottom, which would require a further immersion of the leg in question; when this is not the case, the buoyancy bodies 57 are pulled up fully, secured and provided with ballast to the extent necessary to drive the legs 56 down and / or that. test these under load.
Løfte- og fastgørelsesindretningen 54, der bevirker den styrede bevægelse af benene 56 gennem det første sæt styr 55, er vist i fig. 8, i hvilken styrepulten 56, energikilden 64 og ledningerne 65 er vist.The lifting and fastening device 54 which causes the controlled movement of the legs 56 through the first set of guides 55 is shown in FIG. 8, in which the control panel 56, the energy source 64 and the wires 65 are shown.
30 Når støttebenene 56 er i den stilling, i hvilken de bærer platformen, bliver arbejdspladzformen 50 hævet langs benene 56 til en sikker højde over de højst forventede bølgehøjder; efter at Ibenenes belastniger er blevet gjort lige store, bliver :benene 35 fastlåst ved hjælp af konventionelle mekanisk, hydraulisk eller pneumatisk betjente indretninger 54 8When the support legs 56 are in the position in which they carry the platform, the workplate shape 50 is raised along the legs 56 to a safe height above the highest expected wave heights; after the leg loads have been made equal, the legs 35 are locked by conventional mechanical, hydraulic or pneumatically operated devices 54 8
DK 154697 BDK 154697 B
(fig. 8), til hvilke også styrepulten 63, energikilden 64 og ledningerne 65 hører. Ved løftningen afprøves også, om støttebenene 56 er i stand til at bære den maksimale belastning, der optræder under borearbejdet.(Fig. 8), to which also the control desk 63, the energy source 64 and the wires 65 belong. When lifting, it is also tested whether the support legs 56 are capable of carrying the maximum load encountered during the drilling operation.
5 De indtrukne opdriftslegemer 57 tømmes derefter for ballast. Når opdriftslegemerne 57 er trukket ind (fig. 6), overfører de ingen sidebelastninger til benene 56 som følge af indflydelse fra bølger med mindre bølgehøjde end den forventede maksimale højde.5 The retracted buoyancy 57 is then emptied of ballast. When the buoyancy bodies 57 are retracted (Fig. 6), they transmit no lateral loads to the legs 56 due to the influence of waves with less wave height than the expected maximum height.
10 Boretårnet 52 bringes derefter i arbejds stillingen som vist i fig. 7.The drill tower 52 is then brought into the working position as shown in FIG. 7th
Skroget 53 kan ved en koordineret betjening af løfte- og fastgørelsesindretningen 58 og opdriftslegemerne 57 bevæges op og ned langs benene 56. IThe hull 53 can be moved up and down along the legs 56 by a coordinated operation of the lifting and fastening device 58 and the buoyancy bodies 57.
15 nødstilfælde, når et eller flere ben 56 ikke mere kan bære den tilsigtede belastning, bliver hosliggende eller egnede opdriftslegemer 57 sænket ned eller trykket ned ved hjælp af løfteindretningen, og deres opdrift benyttes til at formindske den kraft eller 20 belastning, som benet 56 ellers skulle have båret.In emergencies, when one or more legs 56 can no longer bear the intended load, adjacent or suitable buoyancy bodies 57 are lowered or depressed by the lifting device and their buoyancy is used to reduce the force or load that leg 56 otherwise should have worn.
Efter at de nødvendige reparationer er blevet udført, såfremt disse kan udføres på borestedet, trækkes opdriftslegemerne 57 ind, og borearbejdet kan fortsættes .After the necessary repairs have been carried out, if these can be carried out at the drilling site, the buoyancy bodies 57 are retracted and the drilling work can be continued.
25 Når arbejdsplatformen 50 skal flyttes, sænkes opdriftslegemerne 57 ned til en sikker afstand over havbunden, fastgøres og tømmes for ballast i den udstrækning det er nødvendigt, for at kunne løfte skroget 53 og benene 56 som vist i fig. 5. Når 30 benene 56 overfører deres last til en hård bund, er der kun få vanskeligheder forbundet med løftning af disse ben 56. Såfremt støttebenene 56 under opstillingen er trængt dybere ned i bunden, og/eller havbunden yder en modstand mod løftning af benene, der er 35 større end opdriftslegemerne 57's opdrift, og den konventionelle fremgangsmåde til løftning, såsom ikke-25 When the working platform 50 is to be moved, the buoyancy bodies 57 are lowered to a safe distance above the seabed, secured and emptied of ballast to the extent necessary to lift the hull 53 and the legs 56 as shown in FIG. 5. When the 30 legs 56 transfer their load to a hard bottom, there are only a few difficulties in lifting these legs 56. If the supporting legs 56 during the erection have penetrated deeper into the bottom and / or the sea floor provides resistance to lifting the legs 35 greater than the buoyancy of buoyancy bodies 57 and the conventional method of lifting, such as
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US427175A US3872679A (en) | 1973-12-21 | 1973-12-21 | Apparatus and method for reducing the forces on extendible legs of a floating vessel |
| US42717573 | 1973-12-21 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK610174A DK610174A (en) | 1975-09-01 |
| DK154697B true DK154697B (en) | 1988-12-12 |
| DK154697C DK154697C (en) | 1989-05-08 |
Family
ID=23693785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK610174A DK154697C (en) | 1973-12-21 | 1974-11-22 | PROCEDURE FOR TRANSFERING A WORKING PLATFORM FROM A SWIMMING POSITION TO A SURROUNDING SURFACE HAVE GIVEN POSITION AND WORKING PLATFORM TO EXERCISE THE PROCEDURE |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3872679A (en) |
| JP (1) | JPS5738478B2 (en) |
| CA (1) | CA1007470A (en) |
| DE (1) | DE2452560C2 (en) |
| DK (1) | DK154697C (en) |
| FR (1) | FR2255426B1 (en) |
| GB (1) | GB1463605A (en) |
| IS (1) | IS957B6 (en) |
| NL (1) | NL174970C (en) |
| NO (2) | NO139040C (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR7804645A (en) * | 1978-07-19 | 1980-01-22 | Petroleo Brasileiro Sa | SELF-LIFTING PLATFORM FOR MARITIME DRILLING |
| FR2441019A1 (en) * | 1978-11-09 | 1980-06-06 | Lapaix Andre | Barge system forming landing stage - utilises vertical pillars lowered by electric motors to water bed |
| US4472083A (en) * | 1982-12-20 | 1984-09-18 | Younes David T | Oil well rig with water tower |
| US4666341A (en) * | 1983-07-22 | 1987-05-19 | Santa Fe International Corporation | Mobile sea barge and plateform |
| US5855455A (en) * | 1997-07-09 | 1999-01-05 | Ensco International, Inc. | Submersible and semi-submersible dry lift carrier and method of operation for carrying a drilling rig and platform |
| US6305881B1 (en) * | 1998-05-22 | 2001-10-23 | Herman J. Schellstede & Associates, Inc. | Barge stabilization method |
| US6523491B1 (en) * | 1999-11-12 | 2003-02-25 | Textron Inc. | Lift boat |
| KR100823005B1 (en) * | 2001-12-05 | 2008-04-16 | 주식회사 포스코 | Wharf construction method |
| NL1020512C2 (en) * | 2002-05-01 | 2003-11-06 | Marine Structure Consul | Method and vessel for manipulating an offshore construction. |
| AU2003210573A1 (en) * | 2003-01-17 | 2004-08-23 | Textron Inc. | Lift boat |
| KR100560847B1 (en) * | 2005-06-27 | 2006-03-13 | 유진건설주식회사 | Method for constructing a light beacon by excavating tube-type flute |
| US20070039537A1 (en) * | 2005-08-22 | 2007-02-22 | Lockheed Martin Corporation | Method and Apparatus for Ballast-Assisted Reconfiguration of a Variable-Draft Vessel |
| US7453166B2 (en) * | 2006-06-06 | 2008-11-18 | Oceana Energy Company | System for generating electricity from fluid currents |
| US20110101697A1 (en) * | 2008-07-01 | 2011-05-05 | Oceana Energy Company | Systems and methods for supporting underwater energy conversion devices |
| US20100155682A1 (en) * | 2008-12-06 | 2010-06-24 | Burns Mark L | Fast jack liftboat jacking system |
| JP2013509535A (en) | 2009-10-29 | 2013-03-14 | オーシャナ エナジー カンパニー | Energy conversion system and method |
| NL2004402C2 (en) * | 2010-03-16 | 2011-09-20 | Mammoet Europ B V | Semisubmersible and method of its operation. |
| WO2012066039A1 (en) * | 2010-11-18 | 2012-05-24 | Shell Internationale Research Maatschappij B.V. | Water intake riser assembly for an off-shore structure, and method of producing a liquefied hydrocarbon stream and method of producing a vaporous hydrocarbon stream |
| KR101271741B1 (en) * | 2011-06-16 | 2013-06-04 | 삼성중공업 주식회사 | Ship for offshore installation and method for installing the same |
| US20130315677A1 (en) * | 2012-05-01 | 2013-11-28 | Herman Joseph Schellstede | Lift/Boarding Vessel |
| SG2012086682A (en) * | 2012-11-23 | 2014-06-27 | Keppel Offshore & Marine Technology Ct Pte Ltd | Structure-assisted jackup system |
| US9457875B2 (en) | 2015-02-09 | 2016-10-04 | Graduate School At Shenzhen, Tsinghua University | Floating type self-lifting drilling platform |
| CN104627332B (en) * | 2015-02-09 | 2017-03-15 | 清华大学深圳研究生院 | A kind of floating self-elevating drilling platform |
| CN106351226B (en) * | 2016-10-19 | 2018-07-17 | 中交第一航务工程局有限公司 | The anti-puncture precompressed support method of leveling ship |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2771747A (en) * | 1950-07-19 | 1956-11-27 | Bethlehem Steel Corp | Offshore drilling barge |
| FR1468413A (en) * | 1965-02-17 | 1967-02-03 | Verschure & Co S Scheepswerf E | Method for carrying out work on the bed of very rough water from a pontoon which can be fixed in place and pontoon for the implementation of this process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2841961A (en) * | 1953-04-13 | 1958-07-08 | Delong Corp | Off-shore drilling barge |
| US3605669A (en) * | 1969-12-01 | 1971-09-20 | Kerr Mc Gee Chem Corp | Floating self-elevating platform |
-
1973
- 1973-12-21 US US427175A patent/US3872679A/en not_active Expired - Lifetime
-
1974
- 1974-10-29 CA CA212,566A patent/CA1007470A/en not_active Expired
- 1974-11-06 DE DE2452560A patent/DE2452560C2/en not_active Expired
- 1974-11-07 IS IS2242A patent/IS957B6/en unknown
- 1974-11-15 GB GB4961874A patent/GB1463605A/en not_active Expired
- 1974-11-22 DK DK610174A patent/DK154697C/en active
- 1974-11-28 JP JP13697274A patent/JPS5738478B2/ja not_active Expired
- 1974-12-13 FR FR7441277A patent/FR2255426B1/fr not_active Expired
- 1974-12-19 NL NLAANVRAGE7416596,A patent/NL174970C/en not_active IP Right Cessation
- 1974-12-20 NO NO744625A patent/NO139040C/en unknown
-
1980
- 1980-09-24 NO NO802824A patent/NO149321C/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2771747A (en) * | 1950-07-19 | 1956-11-27 | Bethlehem Steel Corp | Offshore drilling barge |
| FR1468413A (en) * | 1965-02-17 | 1967-02-03 | Verschure & Co S Scheepswerf E | Method for carrying out work on the bed of very rough water from a pontoon which can be fixed in place and pontoon for the implementation of this process |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7416596A (en) | 1975-06-24 |
| NO744625L (en) | 1975-07-21 |
| US3872679A (en) | 1975-03-25 |
| DE2452560C2 (en) | 1982-09-23 |
| DE2452560A1 (en) | 1975-07-03 |
| FR2255426B1 (en) | 1982-05-07 |
| FR2255426A1 (en) | 1975-07-18 |
| JPS5738478B2 (en) | 1982-08-16 |
| NO139040B (en) | 1978-09-18 |
| IS2242A7 (en) | 1975-06-22 |
| NL174970B (en) | 1984-04-02 |
| IS957B6 (en) | 1977-01-31 |
| NO149321B (en) | 1983-12-19 |
| DK154697C (en) | 1989-05-08 |
| GB1463605A (en) | 1977-02-02 |
| NO149321C (en) | 1984-03-28 |
| JPS5095990A (en) | 1975-07-30 |
| NL174970C (en) | 1984-09-03 |
| NO139040C (en) | 1978-12-27 |
| DK610174A (en) | 1975-09-01 |
| NO802824L (en) | 1975-06-24 |
| CA1007470A (en) | 1977-03-29 |
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