• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a device for anti-sliding and self-centering of an inner tube inside an outer tube of a submarine pipe length unit for transporting fluids, comprising a ring (4) made of elastomeric material sandwiched between two metal annular plates (6, 8) whose internal diameter corresponds substantially to the diameter of the inner tube and an outer diameter substantially corresponds to the diameter of the outer tube, the device further comprising means (10, 12) for clamping the plates together to compress the ring of elastomeric material.
    公开号:FR3032511A1
    申请号:FR1551106
    申请日:2015-02-11
    公开日:2016-08-12
    发明作者:Francois Regis Pionetti
    申请人:Saipem SA；
    IPC主号:
    专利说明:

    [0001] Title of the Invention Device for anti-sliding and self-centering of an inner tube inside an outer tube of an underwater pipe unit length member for BACKGROUND OF THE INVENTION The present invention relates to the general field of submarine pipes lying at the bottom of the sea or providing the bottom-surface connection for the transfer of hydrocarbons, in particular oil and gas , from subsea production wells. It more specifically relates to coaxial underwater pipes of the "Pipe In Pipe" or PIP type, that is to say "pipe-driving" type, in which an inner tube transports the fluids and an outer tube coaxial with the previous one, also called "outer envelope", is in contact with the environment, that is to say with water. The annular space between the two tubes may be filled with an insulating material or may be emptied of any gas so as to provide thermal insulation for the fluids flowing in the internal duct. Such submarine coaxial pipes are particularly used in the context of installations at great depths where the water temperature is typically 4 ° C. Generally, these coaxial pipes are assembled on the ground in elements of unit length (one speaks of double, triple or quadruple joints, hereinafter indifferently denominated "quad-joints" for quadruple sections of tube), of the order of 10 to 100m according to the carrying capacity of the installation system. These sets of pipes are then transported at sea on a laying ship. During the installation, the quad-joints are connected to each other on board the ship and as and when they are laid at sea. Laying can be done via a J-shaped positioning tower. on the laying ship. With the J-laying, the underwater pipe is typically lowered from the laying vessel practically vertical (between + 30 ° and -10 ° relative to the vertical). Laying J is a simple catenary installation in which the almost vertical inclination of the pipe decreases as it moves downwards to marry the slope of the seabed.
    [0002] 3032511 2 This J-laying method requires moving each new quad-joint from a horizontal position (along the deck of the laying ship) to a vertical position to align with the J-laying tower. The seal is held vertically on the laying tower to allow its lower end to be welded to the upper end of the pipe. Once the quad-joint welded to the pipe, the latter descended into the sea by moving the laying ship forward an advance corresponding to the length of the quad-joint. Applied to coaxial pipes of the "PIP" type, the J-laying method 10 provides for vertically welding the quad-joint on the underwater pipe already in place. The new quad-joint is presented with an upward shift between the outer tube and the inner tube to allow welding of the inner tube to that of the underwater line waiting in the holding device of the J-tower and then sliding the outer tube of the quad-joint with respect to the inner tube downward to weld its lower end to the corresponding free end of the outer tube of the underwater pipe. The latter then descended into the sea and the operation is repeated with a new quad-joint.
    [0003] In practice, such a laying method presents a number of problems. In particular, when lifting the new quad, the inner tube must be held in position to prevent its free sliding. Heretofore, particular complex devices have been placed at the end to support this retention before being removed after welding of the inner tube to the underwater pipe. However, the use of such devices is expensive in terms of exposure time. In addition, when placing the inner tube of the quad-joint on the inner tube of the underwater pipe standing in the J laying tower, the inner tube, if it is free, has a tendency to flare up. the propeller in the outer tube of the underwater pipe, so that it is then generally necessary to adjust the upper part of the pipe to make up this clearance (the inner tube is cut as much as necessary). Finally, the step of sliding the outer tube relative to the inner tube may cause tearing of certain parts positioned around the inner tube of the quad-joint 35 (such as thermal insulation, heating cables, optical fibers , centering wedges, etc.).
    [0004] SUMMARY OF THE INVENTION The main object of the present invention is therefore to propose a device for preventing slipping and self-centering of an inner tube within an outer tube that does not have the aforementioned drawbacks. According to the invention, this object is achieved by means of an anti-sliding and self-centering device of an inner tube inside an outer tube of a unit length element 10 -marine for transporting fluids, comprising a ring of elastomeric material sandwiched between two metal annular plates whose internal diameter corresponds substantially to the diameter of the inner tube and an outer diameter substantially corresponds to the diameter of the outer tube, the device further comprising means for clamping the plates together to compress the ring of elastomeric material. By ensuring that the ring of elastomeric material is compressed by clamping the plates together, the device according to the invention makes it possible in particular to ensure the concentricity of the tubes and the vertical retention of the inner tube inside the outer tube. the unit length element driving (or quad-joint). Indeed, the device is applied at a shoulder of the inner tube with the elastomer compression plates positioned on either side of this shoulder so that the plates are stopped by the shoulder. The device is thus completely fixed with respect to the inner tube, so that the slip required for assembly of the underwater pipe is forced and controlled and can only be done on the inner surface of the outer tube. In addition, the clamping force is applied to the plates of the device to ensure a high anti-slip stress between the inner and outer tubes. The characteristics of the device according to the invention and the clamping force are calibrated according to the weight of the inner tube so as to prevent slipping of the inner tube under the effect of its own weight but to allow such controlled sliding for values 35% greater than 15% to 50% of this weight (the load factor is defined during the design of the device according to the characteristics of the loading arms of the J-laying tower, the tubes 3 0 3 2 5 1 1 4 component underwater pipe and their accessories). More specifically, the load factor of the device should be chosen to avoid inadvertent (i.e. uncontrolled) slippage of the inner tube relative to the outer tube as it is vertically positioned in the J-laying tower ( and thus guarantee the safety of the operators). The load factor must also prevent the relative displacement of the two tubes when laying in the catenary part of the underwater pipe (maintaining a constant length between the tubes). The load factor must also avoid crushing or reducing the annular underwater pipe during pipe length variations due to temperature changes. It should be noted that the sliding of the two tubes relative to each other when adding a quad-joint is a forced and perfectly controlled sliding through the loading arms of the laying tower. J. Indeed, by being able to take the weight (vertical) of a quad-joint, these loading arms are capable of applying vertical forces descending three or four times higher, in particular to force the alignment of the tubes and ensure a weld without perforated sections to be welded. The device according to the invention also makes it possible to keep the inner tube concentric inside the outer tube of the element of unit length. The clearance between the inner tube and the outer tube thus remains constant throughout the assembly operation of the unit length unit of pipe on the underwater pipe. The device according to the invention finally makes it possible to block the parts in position, and in particular heating cables, optical fibers, etc. around the inner tube of the unit length unit of conduct. In this way, the device according to the invention makes it possible to prevent any tearing of these parts during the sliding phase of the outer tube relative to the inner tube. The clamping means may comprise a plurality of screws passing through the two plates and the ring of elastomeric material and which are able to be tightened on nuts. In this case, these screws preferably each have a strength class of 12.9.
    [0005] Preferably, at least one of the two plates is made from at least two angular sectors of plates. This feature has the advantage of facilitating the assembly of the device around the shoulder of the inner tube.
    [0006] Also preferably, the ring of the device is made of ethylene-propylene-diene monomer (EPDM) having a shore hardness of between 30 and 90, a Young's modulus of less than 1 MPa and a Poisson's ratio close to 0.5. . The plates of the device can in turn be made of steel.
    [0007] The invention also relates to a submarine pipe unit length member for the transport of fluids, comprising an inner tube, an outer tube mounted around the inner tube by being coaxial therewith, and at least one device as defined previously which is interposed between the inner tube and the outer tube and disposed about an annular shoulder of the inner tube. Preferably, such a device is interposed between the inner tube and the outer tube at each longitudinal end of said unit length unit underwater pipe. Also preferably, each device is assembled around an annular shoulder of the inner tube positioned vis-a-vis the shoulder of the inner tube. In addition, each device advantageously provides locking in position of at least one heating cable and / or at least one optical fiber.
    [0008] BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the present invention will become apparent from the description given below, with reference to the accompanying drawings which illustrate an embodiment thereof devoid of any limiting character. In the figures: FIG. 1 is a perspective and exploded view of the device according to one embodiment of the invention; FIG. 2 is an assembled view of the device of FIG. 1; FIGS. 3A and 3B are partial and sectional views of the device of FIGS. 1 and 2 in the uncompressed and compressed state, respectively; and FIG. 4 is a view of a submarine pipe length unit of the "PIP" type equipped with devices according to the invention.
    [0009] DETAILED DESCRIPTION OF THE INVENTION The invention applies to the installation of a "Pipe in Pipe" (or "PIP") submarine coaxial pipe, that is to say a pipe which comprises a internal tube for transporting hydrocarbons from production wells and an outer tube coaxial with the former, also called "outer envelope", which is in direct contact with the surrounding water. This type of underwater coaxial pipe is typically used in offshore hydrocarbon production at great depth. In the context of such installations, the underwater coaxial pipes 15 may be assembled on the ground in several elements of unit length (also referred to as "joints", in particular "double joints" for two unitary elements assembled together, "triple joints "for three unitary elements joined together," quadruple joints "for four unitary elements assembled together, or more generically" quad-joints "for quadruple tube sections), of the order of 10 to 100 m according to the holding capacity of the laying system. During installation, these elements of unit length of underwater pipe are connected to each other on board the ship and as and when they are laid at sea.
    [0010] The operation of connecting a unit length element to the underwater pipe already lowered into the sea requires in particular to vertically position the element of unit length pipe, to maintain it in this position during the welding of the lower end of its inner tube to the upper end of the inner tube of the underwater pipe, and then slide the outer tube to weld it to the upper end of the outer tube of the underwater pipe. The object of the invention is an anti-slip and self-centering device which makes it possible, during this connection operation, to hold the inner tube of the unit length element 303 2 5 1 1 vertical and fixed. 7 driving inside the outer tube, while ensuring its centering inside the outer conduit. An example of such a device 2 is shown in perspective and exploded in Figures 1 and 2.
    [0011] The device 2 comprises in particular a ring 4 made of elastomer material which is sandwiched between two annular metal plates 6, 8 (preferably of steel) whose inner diameter d substantially corresponds to the external diameter of the inner tube of the length member. unitary unit on which the device is intended to be assembled, and whose outer diameter D substantially corresponds to the inner diameter of the outer tube of said unit length unit pipe. The device 2 further comprises means for clamping the plates 6, 8 between them to compress the ring 4 made of elastomeric material, the ring having a tendency to "swell" radially both inwards and outwards. plates under the compressive force. The clamping means can be made by means of a plurality of screws 10 passing through both the two plates 6, 8 and the ring 4 of elastomeric material and by nuts 12 clamping. In the example illustrated in Figure 1, the screws 10 are ten in number and are regularly spaced about an axis X-X of revolution of the device. FIG. 3A shows the device of FIGS. 1 and 2 in the assembled and "at rest" position, that is to say without compression of the ring 4 made of elastomer material, while FIG. 3B represents the same device after application of a tightening force of the nuts 12 on the screws 10 causing a compression of the ring 4, and thus a deformation of the latter visible by a "expansion" radially inwardly and outwardly.
    [0012] When the device is interposed between an inner tube and an outer tube of a submarine pipe length unit, this compression of the ring of the device thus ensures a locking in position of the inner tube to the inside of the outer tube. The elastomeric material used to make the ring of the device, as well as the characteristics of the screws / nuts and their clamping force, are selected and calibrated according to the blocking needs of the inner tube of the device. unit length unit of underwater pipe inside the outer tube. In particular, for the particular application envisaged (ie connection vertically of a unit length unit of pipe 5 on an underwater pipe), these choices and calibrations are defined so as to be able to support the weight of the inner tube but not beyond. In particular, the characteristics of the device must not prevent the sliding of the outer tube relative to the inner tube once the latter connected to the inner tube of the underwater pipe.
    [0013] Thus, the characteristics of the device according to the invention may be chosen and calibrated to enable it to absorb a compressive load of between 1 MPa and 5 MPa (with a permissible compressive load of 3.5 MPa). The device can support up to 4.7 tonnes at the inner tube and up to 5.8 tonnes at the outer tube of the unit length unit, these values being indicative only and depend on diameters and dimensions of the contact surfaces). For this purpose, it is possible, for example, to choose as an elastomer material for producing the ring of the ethylene-propylene-diene monomer (EPDM) device having a Shore hardness of between 30 and 90, a Young's modulus less than 1 MPa and a Poisson's ratio of the order of 0.5. Thus, with such a Poisson's ratio, the vertical pressure on the plates exerted by the tightening of the screws is almost equal to the contact pressure on the side walls of the tubes.
    [0014] With such characteristics, the screws 10 used for clamping the plates 6, 8 may each have a strength class of 12.9 so that their clamping allows a approximation of the plates between them of about 0.5 mm . FIG. 4 shows two devices 2 according to the invention assembled at each longitudinal end of a submarine pipe unit length member 14. As previously described, the pipe length element 14 comprises an inner tube 16 disposed within an outer tube 18 by being coaxial thereto.
    [0015] At each of its longitudinal ends, the inner tube 18 is provided with an annular shoulder 20 at which is more specifically a device 2 according to the invention. This shoulder 20 is thin (not to prevent the controlled sliding of the outer tube) and can be obtained by adding a small length of inner tube integrating the shoulder at both ends (it projects radially towards outside). Preferably, the outer tube 18 also comprises, at its inner surface, an annular shoulder 20 'positioned vis-à-vis the shoulder 20 of the inner tube so as to enhance the safety of the device (this shoulder 20' protrudes radially inwards). In the still horizontal position of the element of unit length of conduit, the ring 4 of elastomeric material of the device is thus slid around the inner tube from one of its longitudinal ends to come to cover the shoulder 20 corresponding.
    [0016] The two annular plates 6, 8 are then positioned on either side of the ring 4, the plate situated on the side opposite the end of the inner tube (here the plate 6) being preferably made from at least two angular sectors of plates 6a, 6b (see Figure 1) so as to facilitate its assembly around the inner tube.
    [0017] The screws 10 and nuts 12 are then mounted on the device (without exerting at this stage of tightening the nuts) with the screw heads advantageously turned towards the corresponding longitudinal end of the inner tube. The outer tube 18 of the unit length member of the pipe is then slid longitudinally around the inner tube to its desired position. The screws 10 are then tightened in their nuts 12 so as to compress the ring 4 of elastomeric material. As indicated above, this clamping force is calibrated according to the weight of the inner tube to allow the two devices 30 to support the weight of the inner tube (with a margin of safety of 15 to 20% more). The annular space delimited between the two devices 2 may be filled with an insulating material, in particular with a resin. For this purpose, the devices according to the invention may advantageously serve as a stop wall or mold during the injection of the resin to maintain the latter in a fixed volume and can be evacuated.
    [0018] The pipe unit length element thus assembled can then be mounted vertically by means known per se to allow its assembly on the underwater pipe lowered into the sea.
    [0019] It will be noted that, advantageously, the device according to the invention can be used in such a way as to lock in position around the inner tube of the unit length unit of various parts, such as heating cables, optical fibers, etc. For this purpose, these heating cables, optical fibers or others which extend longitudinally along the inner tube are interposed between the inner tube and the ring of elastomeric material of the device so that the compression of the latter ensures their locking in position.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Device for anti-sliding and self-centering of an inner tube (16) inside an outer tube (18) of a unit (14) of underwater pipe length for transportation of fluids, comprising a ring (4) of elastomeric material sandwiched between two metal annular plates (6, 8) whose internal diameter (d) corresponds substantially to the diameter of the inner tube and an outer diameter (D) substantially corresponds to the diameter the outer tube, the device further comprising means (10, 12) for clamping the plates together to compress the ring of elastomeric material.
    [0002]
    2. Device according to claim 1, wherein the clamping means comprise a plurality of screws (10) passing through the two plates (6, 8) and the ring (4) of elastomeric material and which can be clamped on nuts (12).
    [0003]
    3. Device according to claim 2, wherein the screws (10) each have a strength class of 12.9.
    [0004]
    4. Device according to any one of claims 1 to 3, wherein at least one of the two plates (6) is made from at least two plate angular sectors (6a, 6b).
    [0005]
    5. Device according to any one of claims 1 to 4, wherein the ring (4) is made of ethylene-propylene-diene monomer having a shore hardness of between 30 and 90, a Young's modulus of less than 1 MPa and a Poisson's ratio of the order of 0.5.
    [0006]
    6. Device according to any one of claims 1 to 5, wherein the plates (6, 8) are made of steel.
    [0007]
    An underwater pipe unit length member (14) for conveying fluids, comprising an inner tube (16), an outer tube (18) mounted around the inner tube coaxially thereto, and at least one device (2) according to any one of claims 1 to 6 3032511 12 interposed between the inner tube and the outer tube and arranged around an annular shoulder (20) of the inner tube.
    [0008]
    8. Underwater pipe unit length member according to claim 7, comprising a device interposed between the inner tube and the outer tube at each longitudinal end of said unit length unit member.
    [0009]
    9. Underwater pipe unit length member according to one of claims 7 and 8, wherein the device is assembled around an annular shoulder (20 ') of the outer tube positioned opposite the shoulder (20) of the inner tube.
    [0010]
    Unit underwater pipe length member according to any one of claims 7 to 9, wherein the device locks in position at least one heating cable and / or at least one optical fiber.
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3032511B1|2018-03-02|
    US10197195B2|2019-02-05|
    BR112017015078B1|2021-02-23|
    AU2016217746A1|2017-07-20|
    EP3256771B1|2019-01-02|
    WO2016128655A1|2016-08-18|
    BR112017015078A2|2018-04-10|
    US20180038520A1|2018-02-08|
    EP3256771A1|2017-12-20|
    AU2016217746B2|2018-09-06|
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    法律状态:
    2016-02-23| PLFP| Fee payment|Year of fee payment: 2 |
    2016-08-12| PLSC| Publication of the preliminary search report|Effective date: 20160812 |
    2017-02-23| PLFP| Fee payment|Year of fee payment: 3 |
    2018-02-22| PLFP| Fee payment|Year of fee payment: 4 |
    2019-02-21| PLFP| Fee payment|Year of fee payment: 5 |
    2020-02-18| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-12| ST| Notification of lapse|Effective date: 20211005 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1551106A|FR3032511B1|2015-02-11|2015-02-11|ANTI-SLIP AND SELF-CENTERING DEVICE FOR AN INTERNAL TUBE WITHIN AN EXTERNAL TUBE OF UNDERWATER DUCT UNDERWATER LENGTH MEMBER FOR THE TRANSPORT OF FLUIDS|
    FR1551106|2015-02-11|FR1551106A| FR3032511B1|2015-02-11|2015-02-11|ANTI-SLIP AND SELF-CENTERING DEVICE FOR AN INTERNAL TUBE WITHIN AN EXTERNAL TUBE OF UNDERWATER DUCT UNDERWATER LENGTH MEMBER FOR THE TRANSPORT OF FLUIDS|
    EP16705259.6A| EP3256771B1|2015-02-11|2016-02-05|Anti-slide device for the self-centring of an inner tube inside an outer tube of an element of unit length of a subsea pipeline for transporting fluids|
    AU2016217746A| AU2016217746B2|2015-02-11|2016-02-05|Anti-slide device for the self-centring of an inner tube inside an outer tube of an element of unit length of a subsea pipeline for transporting fluids|
    BR112017015078-6A| BR112017015078B1|2015-02-11|2016-02-05|unitary element of subsea piping for the transport of fluids|
    PCT/FR2016/050252| WO2016128655A1|2015-02-11|2016-02-05|Anti-slide device for the self-centring of an inner tube inside an outer tube of an element of unit length of a subsea pipeline for transporting fluids|
    US15/550,613| US10197195B2|2015-02-11|2016-02-05|Anti-slide device for the self-centering of an inner tube inside an outer tube of an element of unit length of a subsea pipeline for transporting fluids|
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