EP2739790B1 - Coupage d'un pieu off-shore - Google Patents

Coupage d'un pieu off-shore Download PDF

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Publication number
EP2739790B1
EP2739790B1 EP12737555.8A EP12737555A EP2739790B1 EP 2739790 B1 EP2739790 B1 EP 2739790B1 EP 12737555 A EP12737555 A EP 12737555A EP 2739790 B1 EP2739790 B1 EP 2739790B1
Authority
EP
European Patent Office
Prior art keywords
tube
cutting
water jet
drill string
aggregate
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.)
Not-in-force
Application number
EP12737555.8A
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German (de)
English (en)
Other versions
EP2739790A1 (fr
Inventor
Hermann Josef VON WIRTH
Torsten KLEINEN
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.)
Mhwirth GmbH
Original Assignee
Mhwirth GmbH
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Publication date
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Publication of EP2739790A1 publication Critical patent/EP2739790A1/fr
Application granted granted Critical
Publication of EP2739790B1 publication Critical patent/EP2739790B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
    • E02D9/04—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by cutting-off under water
    • 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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/27—Means for performing other operations combined with cutting
    • B26D7/32—Means for performing other operations combined with cutting for conveying or stacking cut product
    • 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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/12—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground specially adapted for underwater installations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0061—Production methods for working underwater
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0448—With subsequent handling [i.e., of product]
    • Y10T83/0467—By separating products from each other
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2074—Including means to divert one portion of product from another

Definitions

  • the invention relates to a method and a device for separating upright, anchored with its lower end in the ground pipes of greater length and larger diameter, typically a length approximately between 30 and 200 m and a diameter of about 1800 mm, in particular anchoring pipes of an offshore Oil drilling or production platform.
  • the wall thickness is typically 50 to 100 mm.
  • the steel anchoring pipes of these platforms are only embedded in the seabed, for example, rammed and held by the friction in the seabed. If this is not sufficient, the alternative is to introduce into the recessed foot of the anchoring pipes underwater concrete or the like, which may escape partially from the lower end of the tube in the surrounding seabed and after curing forms an artificially anchored in the seabed foundation its anchoring effect is added to the effect of the weight of the concrete, which fills the lower part of the respective tube up to a certain height.
  • regulations often require that the anchoring pipes be separated a bit below the seabed.
  • a cutting head for cutting a pipe having a cutting nozzle to which a pressurized abrasive is supplied via a conduit, the cutting nozzle being rotatable about the central axis of the cutting head and the cutting head having a clamping device for clamping against the inner wall of the pipe.
  • Fig. 1b shows in an embodiment for narrow pipes an inclined cutting nozzle.
  • a disadvantage of known methods and devices is that under the extremely harsh environmental conditions (often under high pressure seawater, mixed with drilled concrete or seabed) partially undesirably reliable function or / and a lot of effort is required to support the severed pipe or to intercept.
  • the invention has set itself the task of providing a method and an apparatus which is improved in terms of these disadvantages. This object is achieved by the method set forth in claim 1 and the device reproduced in claim 4.
  • an offshore oil drilling platform is lowered by the upper end of the pipe to be separated a cutting unit into the pipe to a separation zone ,
  • the cutting unit acts progressively against the pipe over the circumference.
  • the separation process takes place by means of a water jet emerging from at least one water jet nozzle.
  • the pipe wall is cut to create two complementary conical cut surfaces by a cut with at least almost constant cutting width, which extends obliquely through the pipe wall.
  • To effect the oblique section of the water jet is the at least one Water jet nozzle at an angle ⁇ , which may for example be between 5 ° and 60 °, aligned to the plane perpendicular to the tube axis A plane E.
  • this angle ⁇ preferably remains constant.
  • water jet nozzle are in the following, unless otherwise specified in the context, also referred to several water jet nozzles.
  • the water jet cutting is reliable even under harsh environmental conditions, especially if, as preferred, the pipe wall is cut in one operation, since then only a very low feed is needed, and avoid existing rocks, without causing damage.
  • the separation zone is preferably below the seabed.
  • the angle ⁇ is preferably 30 °.
  • the weight of the tube and any connected components is not intercepted by additional devices in the separation process. It has been shown that this can be dispensed with because of the self-centering, conically complementary cut surfaces. As a result, a significant cost savings can be achieved.
  • the pipe is even after the separation process to a limited extent further resilient. Because the self-centering minimizes the risk that a lateral offset of the tubes in the separation zone occurs and thereby the bearing surfaces are reduced to such an extent that they no longer withstand the forces, also due to any corrosion damage.
  • a plurality of water jet nozzles are evenly distributed over the circumference of the cutting unit.
  • two water jet nozzles are provided, which are particularly preferably arranged diametrically.
  • raising and lowering of the cutting unit takes place while the water jet is still switched on, so that cuts are made in the direction of the pipe axis.
  • lifting and lowering are thus preferably carried out after a 360 ° rotation, with two diametric water jet nozzles preferably after a rotation of 180 °.
  • the vertical cuts always run at the point where two cuts meet. The then resulting cutting scheme is able to compensate for variations in height during the cutting process, so even if a secure separation of the tube to cause, if the height of the cutting unit varies relative to the pipe during the cutting process.
  • resulting in height variations optionally one or more jumps having cut surface is also referred to in the context of this document as a conical cut surface.
  • this material is preferred when lowering the cutting unit from above Drilled through the pipe and indeed to below the separation zone.
  • the cutting unit is preferably firmly connected to the drill string, more preferably flanged.
  • the inner wall of the tube is preferably cleaned in the region of the separation zone. So it is concrete or seabed, which can still adhere to the pipe walls after any drilling, away. This is preferably done by roller drill bits. These can, if they are in the area of the separation zone, be switchable or constantly, so be during the entire drilling or lowering operation in use.
  • abrasive particles are added to the water.
  • the separation process is a so-called “abrasive jetting” process.
  • Water jet nozzles used for this process are also referred to as “water abrasive jet cutting nozzles” or “WAS cutting nozzles” for short.
  • an air jacket of a plurality of air nozzles is generated around the water jet. This achieves better performance.
  • loose solids are transported out of the interior of the tube during the separation process. Surprisingly, it has been found that this accelerates the separation process and improves the quality of the conical cut surfaces. An explanation for this could be that despite the relatively small cutting width, which is effected during the separation process, the separation process negatively affecting amounts of loose solids, such as sand between the cut surfaces in the pipe interior passes.
  • the outward transport is preferably carried out by using the so-called air lifting method known per se.
  • air is injected into the drill string interior in a hollow drill string which is at least substantially filled with water at a location below the water surface, preferably in the vicinity of the location in which the transport is to take place.
  • the drill string has a suction opening below the injection point. Due to the change in density of the water column caused by the injected air, a flow is produced upwards in the interior of the drill string, which sucks and removes water and loose solids in the vicinity of the suction opening into the interior of the drill string.
  • the method according to the invention also includes the step of boring the pipe filled, for example, with concrete, then, using the same air lifting method, dissolved material, for example concrete particles, can also be conveyed out of the pipe interior during the drilling process.
  • the object is achieved by a device for separating upright, anchored with its lower end in the ground pipes of greater length and larger diameter, in particular anchoring pipes an offshore oil drilling or production platform, the device comprising a cutting unit which is lowered through the upper end of the pipe to be separated in this up to a separation zone.
  • the cutting unit comes in this preferably axially narrow separation zone on the inner circumference of the tube in the circumferential direction progressively to the effect and cuts through the tube.
  • To effect the separation process at least one water jet nozzle is provided.
  • Positioning means are provided which position the water jet nozzle relative to the pipe wall in such a way that the water jet issuing from the water jet nozzle impinges on the pipe wall at an angle ⁇ to the plane perpendicular to the pipe axis such that two complementary conical cut surfaces result when the separation has taken place.
  • the pipes lie flat against one another at these cut surfaces. They center themselves, so that the pipe can continue to absorb forces, in particular compressive forces to a limited extent. A support or a catching of the separated pipe can be dispensed with.
  • the angle ⁇ is 5 ° to 60 °, more preferably about 30 °. It has been found that in this way a sufficient self-centering, given tolerable tensile or compressive forces in the circumferential direction in the pipe wall at the cut surfaces is given and increases the cutting length only to a tolerable extent.
  • tensile or compressive forces in the circumferential direction the forces are meant that arise due to the conical shape of the cut surfaces and spread a pipe end and want to squeeze the adjacent pipe.
  • two water jet nozzles are provided.
  • a drill head is preferably arranged, by means of which in the lower region of the tube befindliches material, such as seabed or concrete or the like, with which the tube may be poured for better anchoring, on the inner cross section of the tube is drilled to a depth, so that the cutting unit can be brought to the intended separation zone for use.
  • befindliches material such as seabed or concrete or the like
  • the drill head is preferably rotatably driven.
  • the cutting unit is preferably fixedly connected to the drill head or to the drill pipe.
  • additional auger bits are provided to clean the inner wall of concrete or seabed debris or the like. These are preferably radially biased. They can be constantly engaged or switchable, so that only in the area of the separation zone is used.
  • an auxiliary hydraulic drive is provided in addition to the main hydraulic drive of the drill string, which can be brought into use during the separation process and provides only a small torque and rotates extremely slowly and is characterized by a particularly uniform speed.
  • the speed may be, for example, one revolution per two hours.
  • the positioning means preferably comprise a guide carriage with guide rollers which can be brought into contact with the tube inner wall.
  • the water jet nozzle is preferably fixed and connected at a selected angle to the guide carriage, so that the water jet is automatically aligned in the correct constant angle to the pipe wall when the carriage abuts the pipe wall, as well as the constant nozzle spacing is ensured to the cutting surface.
  • extension means comprise a pneumatic cylinder and a spring.
  • the water jet nozzle is thus preferably with the carriage and further preferably by a pneumatic cylinder extendable.
  • a retracted position of water jet nozzle with carriage which is preferably taken during the lowering and recovery of the cutting unit in the pipe and an extended position when the cutting unit comes into use.
  • a plurality of air nozzles By blowing out air during the cutting process, the water jet of the Separated ambient water and so avoided that the water jet is braked by ambient water and so the efficiency of the device is reduced.
  • two water jet nozzles may be diametrically located, in the same plane. Each nozzle needs to cut only half the circumference. As a result, the cutting time is almost halved compared to only a single water jet nozzle. In an equally conceivable larger number of water jet nozzles, which are distributed uniformly over the circumference, their number corresponding.
  • two water jet nozzles are arranged behind one another in the same plane to a pair of water jet nozzles.
  • Each nozzle must cut the full circumference and the cutting time is twice as long as two diametrical water jet nozzles.
  • the advantage here is that a higher level of security is achieved that the full cross-section is completely severed. Because one of the two water jet nozzles cuts through with at least almost certainty, even with any jumps (ie irregularities) in the feed.
  • the number of water jet nozzles means the number of water jet nozzle pairs.
  • At least one sensor is provided, which detects the passage of the water jet through the pipe wall, preferably a hydrophone. In this way, a secure complete cutting of the tube can be achieved with the shortest possible cutting time.
  • the means are preferably designed such that the outward transport of the loose solids takes place with the aid of the air lifting method.
  • a suction opening communicating with the inner volume of the drill string and preferably above the cutting unit on the drill string, an air injection opening communicating with the inner wall thereof are provided on the drill string on which the cutting unit is arranged.
  • To the air injection port can be connected to the drill string fixed air line, which is connected to a arranged outside the pipe compressor.
  • FIG. 1 For example, an example of an oil drilling or production platform 100, already separated into its main components, is shown, which includes an actual platform 20 which, when assembled, is supported on a support structure generally designated 21.
  • the entire equipment normally arranged on the platform 20, such as boring device, accommodation, etc., has already been dismantled and is no longer reproduced in the drawing.
  • the cranes 19 For mounting and dismounting of the oil well or conveyor plate molds 100 and / or the support structures 21 are crane ships 46 used, the cranes 19 have the lifting height above the sea level can be 100 m and more.
  • the actual platform 20 depends on the release of the support structure 21 already on the cranes 19. From the support structure 21 is in Fig. 1 only above the sea level 23 ( Fig.
  • the support structure 21 is formed as a tower or bock-like framework with support legs 2 and truss-like cross braces and anchored by means of their reaching down into the water (indicated by dash-dotted lines) anchoring pipes 2a under the water surface in the seabed.
  • the tubes 1 are also filled with concrete in their lower area.
  • the water is usually between 30 and 200 m deep and it can be embedded by a comparable distance in the seabed, each anchoring tube 2a, z. B. be rammed.
  • the anchoring pipes 2a are therefore very long. They consist of large pipes 1 of 1800 mm in particular diameter and considerable wall thickness of 80 mm in particular.
  • Fig. 2 illustrates the disassembly situation of a support structure 21, the constructive something of Fig. 1 differs.
  • the upper parts 26 of the support legs 2 are cut off at the freely accessible Abtrennstelle 22 and still belong to the actual platform 20, according to Fig. 1 lifted from the cranes.
  • the support structure 21 protrudes above the sea level 23 and extends down a distance corresponding to the water depth to the seabed 8.
  • the anchoring pipes 2a extend deep into the seabed and can be anchored at its lower ends by pressed underwater concrete or the like fundamentally in the seabed 8 be.
  • the anchoring pipes 2a are separated at a distance 24 of a few meters below the seabed 8 separation points or separation zones 4 of their reaching deep into the seabed 8 lower ends.
  • the separation zones 4 are difficult to reach from the outside.
  • Fig. 3 shows general information regarding the so-called air lifting principle.
  • an air lifting pipe or drill string 29 at the lower end of a drill head 36 is arranged.
  • This can be, for example, a Rock drill head or rock drill bit trade.
  • a compressed air line 27 is guided at the upper end via an air lift-flushing head 31.
  • the compressed air is guided down the drill string to the compressed air inlet valve 30.
  • This overburden or excavation 34 passes through an outlet hose 33 in a mine pit 35.
  • a power rotary head or a rotary drive 32 is provided at the upper end of the drill string.
  • Around the drill string around a standpipe 28 is arranged.
  • the tube 1 is severed from the inside.
  • Fig. 4 shows the drill string 37, which is designed as Lucashebbohr tube or strand 29. At its lower end a rock drill bit or rock drill bit 36 is arranged. Between the drill head 36 and the drill string 37, a cutting unit adapter or cutting unit adapter 47 is arranged. This is in each case connected by means of a flange with the drill head and with the drill string.
  • the cutter assembly adapter 47 may be attachable to a conventional drill pipe 37 and a conventional drill bit.
  • the cutting unit adapter or the cutting unit adapter 47 comprises the cutting unit 3.
  • Fig. 5 shows a larger area of the drill string 37.
  • a stabilizer 38 can be seen, which is supported in the tube 1 and in which the drill pipe 37 is rotatably mounted. It can be provided several drill collars.
  • Fig. 6 shows the cutting unit 3 in action.
  • the cutting unit 3 comprises two water jet nozzles 5, 5 '.
  • the water jet nozzles are progressing in a plane E substantially perpendicular to the tube axis A in the circumferential direction of the tube 1 displaced.
  • the two water jet nozzles are diametrically opposed. It is also possible that they are arranged directly next to each other to ensure a safe cut and to increase the redundancy (not shown in the figures).
  • Fig. 8 can be seen, 5 more air nozzles 14 are arranged around each water jet nozzle.
  • the water jet nozzles 5, 5 ' are respectively positioned by positioning means 9a, which comprise a guide carriage 11, 11' with guide rollers 12, 12 '.
  • Each water jet nozzle 5, 5 ' is thus arranged on a carriage 11, 11', each having four guide rollers 12, 12 '.
  • the water jet nozzles 5, 5 ' are each firmly mounted on the guide carriage 11, 11' in such a way that the water jet 15 does not strike the tube wall 6 parallel to the plane E, which runs perpendicular to the tube axis A.
  • Fig. 8 shows that the water jet nozzle 5 and the water jet emerging from it instead assumes an angle ⁇ of 30 ° to this plane E. The same applies to the other water jet nozzle 5 '.
  • the cutting width B is small and almost constant.
  • Fig. 9 shows the sectional diagram 7a of the water jets. After both water jet nozzles 5, 5 'have passed through the complete inner circumference of the tube 1 together, so after a 180 ° rotation of the cutting unit 3, the cutting unit 3 is raised and lowered slightly. From this results in the direction of the tube axis extending sections 7e (in Fig. 9 recognizable only on one side) which compensates a height variation of the cutting unit 3 during the cutting process, which can last for several hours. Lifting and lowering the cutting unit with the water jet switched on takes place to a degree, so that the tube 1 is severed sure of the expected height variations.
  • the water jet nozzles 5, 5 'and the positioning means 9a are extended by means of extending means 9 from a retracted position to an extended position.
  • the extension means 9 comprise a substantially straight pivot arm 40, and a pneumatic cylinder 10.
  • the pivot arm 40 has at one end rotatably mounted on the carriage 11 or 11 'on. At its opposite end it is rotatably mounted on the other cutting unit 3. In a central region of the pivot lever, which is arranged closer to the cutting unit side bearing than at its other end, the free end of the piston rod of the pneumatic cylinder 10 engages the pivot arm 40 via a rotatable connection.
  • the pneumatic cylinder 10 itself is also rotatably or pivotally attached to the cutting unit 3.
  • fenders 39 are provided. These are rigid and protect the water jet nozzles and the extension means and positioning means in the retracted position of the water jet nozzles 5, 5 '.
  • Fig. 11 illustrates the device of the invention and the inventive method in a highly schematic.
  • the elements are sometimes not drawn in their "correct” position. It shows the drill pipe 37, at the lower end of the drill head 36 is arranged. To the right of this is shown an additional roller drill bit 18 which is biased by a pneumatic cylinder 18a. Left of the drill head 36, the elements of the cutting unit 3 are shown. It can be seen the extension means 9, which include the pneumatic cylinder 10 and the pivot lever 40. The carriage 11 is not shown. There is a water jet nozzle 5 visible and a jet of water 15. Different than in Fig. 11 shown, the water jet 15 only an extremely small expansion.
  • the water jet nozzle 5 is connected by means of a water line 13 with a mixing valve 44, are mixed over the abrasive particles 43.
  • the high-pressure water pump 41 is shown, with the further water line 42.
  • a compressor 45 can be seen on the other side of the drill string 37.
  • the compressed air line leads shown on the right side of the drill string via the Lufthebe réellekopf 31 to the compressed air inlet valve 30, via which the compressed air for the air lifting method is blown into the drill pipe 37.
  • the air pressure line extends to the cutting unit 3. There it divides again in a line to the pneumatic cylinder and another line to the air nozzles 14th
  • Fig. 12 shows an example of a support leg 2 with anchoring pipes 2a to be separated.
  • the separation zone 4 is 6m below the seabed 8 and the water depth is 140m.
  • the anchoring pipes 2a are filled with concrete and loaded.
  • the anchoring tubes 2a and the support legs are inclined at an angle of about 9.5 °.
  • the seabed consists of compact sand with layers of different composition (sand and organic sediments).
  • the method according to the invention can be carried out under harsh conditions such as strong wind, high waves and low temperatures.
  • limiting Factor is the dynamic support safety of the support leg 2 with severed anchoring pipes 2a in harsh weather conditions.
  • the cutting unit adapter 47 in this embodiment itself comprises the additional roller bits 18, 18 ', 18 ".In addition, further roller bits 18b are provided on the drill head 36.
  • the functions of the two compressed air lines are independently controllable.
  • Fig. 14 is - schematically - a device according to the invention shown during the separation process.
  • Previously was with the help of their arranged at the lower end of Lufthebbohrstrangs 29 drill head 36 within the tube concrete 16 drilled to below the seabed 8 and then the Heilhebbohrstrang 29 in the in Fig. 14 shown position has been raised.
  • the cutting unit 3 in a position in which the separation zone 4 is still below the seabed 8, but between the drill head and the surface O of the concrete 16 remains a free space.
  • the air lifting is operated during this separation process by - as in Fig. 15 is shown - is injected through the compressed air line 27 and the compressed air inlet valve 30 air in the Lucashebbohrstrang 29.
  • the air flow is symbolized by the arrows in the compressed air line 27.
  • sea sediment located within the anchoring pipe 2a is transported away. This is - as in Fig. 14 can be seen - by a provided above the sea level 23 inlet 51 water, in Fig. 14 symbolized by the large points, initiated, in a volume flow, so that the water level 23 'within the support tube 2a is regularly above the sea level 23.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Paleontology (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Forests & Forestry (AREA)
  • Earth Drilling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (14)

  1. Procédé de séparation de tubes verticaux (1), de longueur et de diamètre relativement grands, dont l'extrémité inférieure est ancrée dans le sol, notamment des tubes d'ancrage (2a) d'une plate-forme (100) de production pétrolière ou de forage pétrolier au large, procédé dans lequel une unité de coupe (3), qui agit au niveau de la périphérie progressivement contre le tube (1), est abaissée dans le tube (1), par l'extrémité supérieure du tube (1) à séparer, jusqu'à une zone de séparation (4), et l'opération de séparation est effectuée au moyen d'un jet d'eau (15) sortant d'au moins une buse à jet d'eau (5, 5'), la paroi de tube (6) étant sectionnée par une découpe (7) d'une largeur (B) au moins à peu près constante, qui s'étend obliquement à travers la paroi de tube (6), afin de réaliser deux surfaces de coupe coniques complémentaires (7c, 7d), le jet d'eau (15) de l'au moins une buse à jet d'eau étant orientée en formant un angle (α), par rapport au plan (E) perpendiculaire à l'axe de tube (A), pour effectuer la découpe oblique (7), le poids du tube (1) et éventuellement de composants associés dans l'opération de séparation n'étant pas soutenu par des dispositifs supplémentaires.
  2. Procédé selon la revendication 1, caractérisé en ce que des particules abrasives sont mélangées à l'eau du jet d'eau.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, après une rotation de 360° divisée par le nombre de buses à jet d'eau (5, 5'), un soulèvement et un abaissement de l'unité de coupe (3) sont effectués lorsque le jet d'eau est mis en marche de façon à obtenir des découpes (7b) s'étendant en direction de l'axe de tube (A).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que des matières solides détachées sont évacuées de l'intérieur du tube pendant l'opération de séparation.
  5. Procédé selon la revendication 4, caractérisé en ce que le transport d'évacuation est effectué à l'aide du procédé pneumatique de levage.
  6. Dispositif de séparation de tubes verticaux (1), de longueur et de diamètre relativement grands, dont l'extrémité inférieure est ancrée dans le sol, notamment des tubes d'ancrage (2a) d'une plate-forme (100) de production pétrolière ou de forage pétrolier au large, ledit dispositif comprenant une unité de coupe (3) qui peut être abaissée dans le tube (1), à séparer à travers l'extrémité supérieure de celui-ci, jusqu'à une zone de séparation (4) et qui agit dans cette zone de séparation (4) progressivement dans la direction périphérique au niveau de la périphérie intérieure du tube (1) et sectionne le tube (1), au moins une buse à jet d'eau (5, 5') étant prévue pour effectuer l'opération de séparation, des moyens de positionnement (9a) étant prévus qui positionner la buse à jet d'eau (5, 5') de telle sorte que le jet d'eau (15), qui sort de la buse à jet d'eau (5, 5'), est incident à la paroi de tube (6) en formant un angle (α) par rapport au plan (E) perpendiculaire à l'axe de tube (A) de sorte que, lorsque la séparation est effectuée, on obtient deux surfaces de coupe coniques complémentaires (7c, 7d), l'unité de coupe (3) étant reliée à des tiges de forage (37).
  7. Dispositif selon la revendication 6, caractérisé en ce que l'angle (α) est compris entre 5° et 60°, de préférence il est d'environ 30°, et avantageusement il est prévu deux buses à jet d'eau (5, 5').
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce qu'au-dessous de l'unité de coupe (3) est disposée une tête de forage (36) qui permet de creuser la matière se trouvant dans le tube, tel que le fond de la mer ou du béton (16) ou similaire, au moyen de laquelle le tube peut être e coulé pour un meilleur ancrage, par la section intérieure du tube (1) jusqu'à une profondeur de sorte que l'unité de coupe (3) peut être utilisée dans la zone de séparation (4) prévue.
  9. Dispositif selon l'une des revendications 6 à 8, caractérisé en ce que des trépans (18, 18', 18") sont prévus qui éliment le béton et les résidus de fond marin la paroi intérieure du tube.
  10. Dispositif selon l'une des revendications 6 à 9, caractérisé en ce qu'en plus de l'entraînement hydraulique principal de la tige de forage, un moteur hydraulique auxiliaire est prévu qui peut être utilisé au cours de l'opération de séparation, qui tourne très lentement et qui est caractérisé par une vitesse de rotation particulièrement uniforme.
  11. Dispositif selon l'une des revendications 6 à 10, caractérisé en ce que les moyens de positionnement (9a) comprennent un chariot de guidage (11, 11') équipé de galets de guidage (12, 12') qui peuvent être amenés en contact avec la paroi intérieure du tube.
  12. Dispositif selon l'une des revendications 6 à 11, caractérisé en ce qu'une pluralité de buses à air (14) sont disposées autour de la buse à jet d'eau (5, 5').
  13. Dispositif selon l'une des revendications 6 à 12, caractérisé en ce que des moyens sont prévus qui permettent d'évacuer, pendant l'opération de séparation, des matières solides détachées depuis l'intérieur de la pipe.
  14. Dispositif selon la revendication 13, caractérisé en ce qu'un orifice d'aspiration, communiquant avec le volume intérieur de la tige de forage, est prévu au niveau de la tige de forage au-dessous de l'unité de coupe et un orifice d'aspiration, communiquant avec le volume intérieur de la tige de forage, est prévu au niveau de la tige de forage de préférence au-dessus de l'unité de coupe.
EP12737555.8A 2011-08-04 2012-07-19 Coupage d'un pieu off-shore Not-in-force EP2739790B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110052399 DE102011052399B4 (de) 2011-08-04 2011-08-04 Verfahren und Vorrichtung zum Abtrennen von Rohren
PCT/EP2012/064197 WO2013017420A1 (fr) 2011-08-04 2012-07-19 Procédé et dispositif de sectionnement de tubes

Publications (2)

Publication Number Publication Date
EP2739790A1 EP2739790A1 (fr) 2014-06-11
EP2739790B1 true EP2739790B1 (fr) 2016-10-05

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EP12737555.8A Not-in-force EP2739790B1 (fr) 2011-08-04 2012-07-19 Coupage d'un pieu off-shore

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US (1) US9453384B2 (fr)
EP (1) EP2739790B1 (fr)
KR (1) KR101740776B1 (fr)
DE (1) DE102011052399B4 (fr)
WO (1) WO2013017420A1 (fr)

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NO339945B1 (no) * 2014-07-10 2017-02-20 Vetco Gray Scandinavia As Frigjøring av klemkopling ved hjelp av vannskjæring av drivskrue
KR101652352B1 (ko) * 2014-09-24 2016-09-01 삼성중공업 주식회사 굴삭 펌프 장치
EP3259100B1 (fr) 2015-02-18 2020-10-14 ANT Applied New Technologies AG Équipement de découpe à l'eau abrasive
WO2017161267A2 (fr) 2016-03-18 2017-09-21 Torqbuddy Llc Boîte de soupape à clavettes
CN106985083A (zh) * 2017-05-09 2017-07-28 安徽理工大学 一种具有靶物击穿判断功能的切割装置
US10697263B2 (en) 2017-11-15 2020-06-30 Terydon, Inc. Centering device for a utility tool in a tube or pipe
US10774606B2 (en) 2017-11-15 2020-09-15 Terydon, Inc. Down well pipe cutting device
US11002095B2 (en) 2017-11-15 2021-05-11 Terydon, Inc. Down well pipe cutter having a plurality of cutting heads
US10781652B2 (en) 2017-11-15 2020-09-22 Terydon, Inc. Method for cutting a tube or pipe
US11571756B2 (en) * 2018-03-06 2023-02-07 Leon Trudeau Internal pile cutter
DE102018121385A1 (de) * 2018-09-03 2020-03-05 Innogy Se Rückbau von Hohlpfählen mittels helixförmigen Schnitts
MY197451A (en) * 2019-11-06 2023-06-19 Petroliam Nasional Berhad Petronas A system and method for cutting of offshore structures
CN112962602B (zh) * 2021-02-02 2022-10-28 中国海洋石油集团有限公司 一种桩腿清理设备等距旋转辅助装置
CN113718773B (zh) * 2021-08-24 2022-09-23 南京吉欧地下空间科技有限公司 一种高压水射流辅助拔桩设备及施工方法
KR102388686B1 (ko) * 2021-11-24 2022-04-21 주식회사케이베츠 워터젯을 이용한 비접촉식 파일 절단장치
KR102396663B1 (ko) * 2021-11-24 2022-05-13 주식회사케이베츠 워터젯을 이용한 비접촉식 파일 절단방법
WO2023194721A1 (fr) * 2022-04-04 2023-10-12 Wellcut Solutions Limited Tête de coupe rotative et système de coupe ainsi que procédé de coupe d'un objet longitudinal creux depuis l'intérieur

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DE3778542D1 (de) 1987-07-28 1992-05-27 Menck Gmbh Vorrichtung zum abtrennen rohrfoermiger gruendungspfaehle unter wasser.
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Also Published As

Publication number Publication date
EP2739790A1 (fr) 2014-06-11
US9453384B2 (en) 2016-09-27
DE102011052399B4 (de) 2014-11-13
DE102011052399A1 (de) 2013-02-07
KR20140054101A (ko) 2014-05-08
WO2013017420A1 (fr) 2013-02-07
US20140157963A1 (en) 2014-06-12
KR101740776B1 (ko) 2017-05-26

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