WO2014184480A1 - Dispositif d'ancrage d'un support de goulottes d'une installation fond-surface - Google Patents
Dispositif d'ancrage d'un support de goulottes d'une installation fond-surface Download PDFInfo
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- WO2014184480A1 WO2014184480A1 PCT/FR2014/051096 FR2014051096W WO2014184480A1 WO 2014184480 A1 WO2014184480 A1 WO 2014184480A1 FR 2014051096 W FR2014051096 W FR 2014051096W WO 2014184480 A1 WO2014184480 A1 WO 2014184480A1
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- support structure
- tendons
- distance
- base
- tendon
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
- E02D27/525—Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/50—Anchored foundations
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
- E21B17/012—Risers with buoyancy elements
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/08—Underwater guide bases, e.g. drilling templates; Levelling thereof
-
- 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
- E02B2017/0095—Connections of subsea risers, piping or wiring with the offshore structure
Definitions
- the present invention relates to a device for anchoring a rigid structure maintained immersed in the sub-surface by floats and anchored to the seabed by tendons, useful for supporting a plurality of support elements and guide-shaped arch called chutes in an installation of bottom-surface connections between the same floating support and the bottom of the sea.
- the present invention relates to an installation of flexible multi-surface-to-surface bonds between wellheads, equipment or the ends of submarine pipes resting at the bottom of the sea and a floating support surface, comprising a plurality of flexible lines including flexible pipes whose lower ends are connected to the ends of a plurality of submarine pipes lying at the bottom of the sea or directly to wellheads or equipment resting at the bottom of the sea.
- flexible line pipes or cables capable of accepting significant deformations without generating significant return forces, such as flexible pipes defined below, but also cables or transfer lines energy or information such as electrical cables, control cables or hydraulic fluid transfer lines supplying hydraulic equipment such as cylinders or pipes containing optical fibers; or a control umbilical comprising one or more hydraulic lines and / or electric cables for transmitting energy and / or information.
- the technical field of the invention is more particularly the field of the manufacture and installation of bottom-surface connections for the underwater extraction of oil, gas or other material.
- soluble or fusible or a suspension of mineral material from wellhead immersed to a floating support for the development of production fields installed in open sea off the coast.
- the main and immediate application of the invention being in the field of oil production.
- the floating support generally comprises anchoring means to remain in position despite the effects of currents, winds and waves. It also generally comprises oil storage and processing means as well as means of unloading to removal tankers, the latter being present at regular intervals to carry out the removal of the production.
- the common name of these floating supports is the Anglo-Saxon term “Floating Production Storage Offloading” (meaning “floating medium of storage, production and unloading") which one uses the abbreviated term "FPSO" in the whole of the following description.
- a connecting pipe generally a flexible connecting pipe, between the upper end of said riser and a floating support on the surface, said flexible connecting pipe taking, if appropriate, by its own weight in the form of a curve in plunging chain, that is to say, descending widely below the float to then go up to this floating support.
- Background-to-surface bonds are also known which are carried out continuously up to the sub-surface of the strong and rigid ducts constituted by tubular elements of thick steel welded or screwed together, in a chain configuration with a continuously variable curvature.
- Step Catenary Riser meaning "chain-shaped steel riser” and also commonly referred to as “catenary type rigid pipe” or “SCR type riser”.
- SCR Step Catenary Riser
- Such a catenary duct may go up to the floating support surface or only to a subsurface float that tensions its upper end, which upper end is then connected to a floating support by a plunger flexible connecting pipe.
- Background-surface bonds are also known for connecting a floating support to pipes or installations at the bottom of the sea made entirely of flexible pipes, especially in the case where the depth of water is not very important, for example 300 at 750m, or even 1000m and where the well heads or the underwater equipment are not very far from said floating support.
- flexible pipe refers to the pipes known under the name “flexible”, well known to those skilled in the art and which have been described in the normative documents published by the American Petroleum Institute (API ), more particularly under the API 17J and API RP 17 B references.
- API American Petroleum Institute
- hoses are manufactured and marketed by TECHNIP-COFLEXIP France.
- These flexible pipes generally comprise internal sealing layers of thermoplastic materials associated with layers resistant to the pressure internal to the pipe, generally made of steel or composite materials made in the form of spiral strips, contiguous inside the thermoplastic pipe to withstand the bursting internal pressure and supplemented by external reinforcements above the thermoplastic tubular layer also in the form of contiguous spiral strips, but with a pitch longer, that is to say an angle of inclination of the lower helix, in particular from 15 ° to 55 °.
- each of said bottom-surface connections must be kept apart from its immediate neighbors in order to avoid any interference. and any impact, not only at the level of the floats, but also at the level of flexible pipes and electrical cables and other flexible lines such as electrical cables or information signal transfer umbilicals providing connection with said floating support, when said Flexible pipes are subject to the effects of the current, and that said floating support is subject to more waves, wind and current.
- each of the wellheads is individually connected to said floating support and is then left with a very large amount of bottom-surface connections that we no longer know how to install because the length of the plating of the support is limited and therefore accepts only a limited number of bottom-surface links.
- the flexible pipes are implemented through guiding elements in the form of arches called chutes defining a rigid convex curved support surface explained below, to delimit two portions of flexible pipes comprising a first portion of flexible pipe in the configuration of a double plunging chain between floating support and said chute and a second portion of flexible pipe in simple chain configuration between said chute and the point of contact and tangency of said flexible pipe with the bottom of the sea.
- chutes guiding elements in the form of an arch called chutes are well known to those skilled in the art; they present :
- a longitudinal section of curved shape in section in the axial vertical longitudinal plane of the chute preferably a concavity-shaped circular section facing the seabed and a convex outer surface on which the pipe is disposed, and
- a transverse section in the vertical plane perpendicular to the vertical axial longitudinal plane of the chute having a shape with a curved bottom, preferably circular, concavity facing upwards, constituted by said upper external surface framed by longitudinal lateral flanges ensuring the maintenance and guiding the pipe in the longitudinal direction between said flanges.
- the radius of curvature of the downwardly concavity-oriented longitudinal curvature is greater than the minimum radius of curvature of the pipe passing through said chute.
- Such a chute makes it possible to confer on the portion of flexible pipe that it supports a controlled curvature to avoid excessive curvature which would degrade irreparably said pipe.
- a so-called flexible underwater line suspended at its two ends takes its own weight in the form of a so-called double plunging curve, known to those skilled in the art, that is to say descending in configuration of chain to a low point of horizontal tangent (see below) to then go up to said floating support, which plunger chain allows large displacements of its ends absorbed by the deformations of the flexible pipe, including the rise or descent of said low point of the plunging chain.
- R R 0. (Y / R 0 + 1) 2 in which: x represents the distance in the horizontal direction between said contact point and a point M of the curve;
- y represents the altitude of the point M (x and y are therefore the abscissae and ordered from a point M of the curve with respect to an orthonormal coordinate system whose origin is at the point of contact),
- Ro represents the radius of curvature at said point of contact, ie at the point of horizontal tangency,
- - R represents the radius of curvature at the point M (x, y).
- the curvature varies along the chain from the upper end where its radius of curvature has a maximum value Rmax, to the point of contact with the ground where its radius of curvature has a minimum value Rmin (or R 0 in the formula above).
- Rmax maximum value
- Rmin minimum value
- the essential function of the first portion of a double plunger chain of flexible pipe upstream of the chute is, more specifically, to absorb, at least in part, the movements of the pipe and / or the movements of the floating supports to which said flexible line is connected, mechanically decoupling the respective movements of said second flexible pipe portion into a simple chain and said floating support.
- another function is also to reduce the tensile forces exerted by said second portion of flexible pipe, the marine equipment and / or the end of the pipe resting on the bottom of the sea to which it is connected, if any .
- these intermediate support chutes of said flexible pipes are maintained in surface at a certain depth by floats supporting or to which are suspended each of the chutes. But, these floats are subject to significant movement which requires to provide a sufficient distance between the different floats to prevent them from colliding against each other.
- pluralities of bottom-surface connections are described in which flexible pipes extend from a floating support to the seabed via a rigid support structure supporting a plurality of trunks. all arranged at the same height side by side offset laterally, said chutes being supported by a said support structure resting at the bottom of the sea or by a said support structure suspended from floats and connected by no more than 2 tendons to a base anchored to the bottom of the sea.
- the upper and lower ends of the tendons are connected to the support structure at the points of attachment of the support structure and respectively to the base at the levels of hooked points thereof hereinafter referred to "Top hung points" and "bottom hung points”.
- a known but unsatisfactory solution for reducing the hyperstaticity of a multi-tendon system consists in designing a support structure for troughs that has great flexibility, that is to say that can be deformed substantially, which makes it possible to participate then, but within certain limits, all the tendons.
- the main disadvantage of this configuration is that tiredness and wear problems feared at the level of the tendons and their hanging points, are then transferred to the support structure and can thus lead, in the event of an incident, to worse damage. again.
- Another problem is to provide a system for anchoring said support structure for which it is possible without difficulty to perform maintenance operations consisting of changing any of the tendons, without disturbing the operation of the device, so without the need to disconnect the conduct and / or stop oil production
- the problem posed according to the present invention is therefore to provide an installation with a multiplicity of connections bottom-surface flexible pipe from the same support structure trunking anchored at the bottom of the sea by a plurality of tendons d at least 3 tendons in a mechanically quasi or pseudo isostatic manner on the one hand and on the other hand whose maintenance is as easy as possible.
- Another problem is to be able to make a manufacturing and easy implementation by manufacturing and sequential laying of the various pipes from a laying ship on the surface, and to optimize the implementation of the means of buoyancy and tensioning and anchoring of the trunking support structure in the case of implementation spread over time over a long period of time between the establishment of the various flexible bottom-surface connections and without it being necessary to know at the beginning the number of connections to be made, their characteristics in terms of dimensions, and unit weight.
- Another problem of the present invention is also to provide a facility of flexible bottom-surface connections of high strength and low cost, and whose manufacturing processes and implementation and maintenance of the various components are simplified and also low cost, and can be achieved at sea from a laying ship.
- the present invention relates to a device comprising a rigid structure maintained submerged in sub-surface by floats and anchored to the bottom of the sea by tendons, useful for supporting a plurality of support elements and guide-shaped arch called chutes in a bottom-surface connection facility between the same floating support and the seabed, comprising a plurality of flexible lines including flexible pipes extending to the bottom of the sea where they are connected to heads subsea wells, equipment or pipe ends lying at the bottom of the sea, said flexible lines being supported respectively by said plurality of troughs.
- Said chute support structure is connected to a base resting and / or anchored to the bottom of the sea by a plurality of n tendons tensioned substantially parallel, preferably substantially vertically, by said floats, n being at least equal to 3, a plurality p said tendons among the n tendons, p being at least equal to (n-2), being connected at one of their ends each to a distance variation device integral with said base or said support structure, said variation device distance being connected to said base or said support structure or integral with said base or said support structure, the other end of said tendon being fixed to a hooked point integral with said support structure or said base, said device variation of distance being able to be actuated to vary the distance between its hooked point said tendon and said base or said support structure to which it is attached or connected.
- the upper end of said tendon is attached to an upper hooked point integral with said support structure or said distance variation device respectively, the lower end of said tendon being fixed to a fixed lower hooking point.
- said distance variation device or respectively said base said distance variation device being able to: - vary the distance between said upper hook point and said support structure, when said distance variation device is integral with said structure support, or
- the distance variation device makes it possible to vary the distance between said support structure and said base.
- said distance variation device when it is secured to said structure is fixed to said support structure at the underside thereof, and when it is secured to said base, said distance variation device is fixed on the upper surface of said base.
- the decrease or increase in the distance between said support structure and said base causes an increase or decrease in tension of said tendon.
- the increase of the tension of said tendon can cause an elongation of said tendon with an increase proportional to the tension, of its length, in practice an elongation of less than 1%.
- the variation in distance between said support structure and said base is substantially identical to the variation in distance between said lower (or upper) hook point and said base (or respectively said support structure), the the difference resulting from the variation of tendon length when the tension in said tendon increases because the distance between said base and said support structure decreases. More specifically, in this case, the variation in distance between said base and said support structure is slightly greater than the variation in distance between said lower (or upper) hook point and said base (or respectively said support structure) due to elongation of the tendon.
- the distance variation devices make it possible to make the system virtually isostatic, and where appropriate makes it possible to distribute the load on each of the tendons in a controlled manner.
- the distance variation device makes it easier to maintain and replace a tendon as needed by reducing the tension as needed.
- a said tendon consists of a cable or a chain or a rigid bar articulated at its ends.
- said tendon connected to a said distance variation device is a single cable or chain.
- the two tendons not connected to a said distance variation device are located at the two opposite longitudinal ends of the support structure preferably with their two corresponding upper attachment points arranged diagonally.
- the upper hook points of the three said tendons are in a substantially horizontal plane and form a triangle, preferably the closest to an equilateral triangle.
- An object of the present invention is therefore to provide an improved installation of a large amount of flexible bottom-surface connections for connecting a floating support with a plurality of well heads and / or subsea installations installed at the bottom of the sea, comprising a submerged chute support structure anchored to the sea bottom by a plurality of tendons which overcomes the above-mentioned drawbacks.
- the present invention provides a device comprising a rigid structure maintained immersed in the sub-surface by floats and anchored to the bottom of the sea by tendons, useful for supporting a plurality of support elements and guide-shaped arch called chutes in a bottom-surface connection facility between the same floating support and the seabed, comprising a plurality of flexible lines including flexible pipes extending to the bottom of the sea where they are connected to heads subsea wells, equipment or pipe ends lying at the bottom of the sea, said flexible lines being supported respectively by said plurality of troughs, device in which:
- said chute support structure is connected to a base resting and / or anchored to the seabed by a plurality of n tendons tensioned substantially parallel, preferably substantially vertically, by said floats, n being at least equal to 6, plurality of said p tendons among the n tendons, p being at least equal to (n-2), being connected at one of their ends each to a distance variation device, said distance variation device being connected to said base or said support structure or integral with said base or said support structure, the other end of said tendon being fixed to a hooked point integral with said support structure or said base, said distance variation device being able to be actuated to vary the distance between its point of attachment to said tendon and said base or said support structure to which it is attached or connected, and
- the upper end of said tendon is attached to an upper hooked point integral with said support structure or said distance variation device, respectively, the lower end of said tendon being fixed to a lower hooked point integral with said distance variation device or respectively of said base, said distance variation device being able to:
- said device comprises at least 6 upper hook points of which at least 3 first upper hook points are inscribed in a circle (C), the at least 3 other upper hook points being disposed on or within said circle (C).
- said support structure has a longitudinal shape of substantially rectangular section in horizontal section, and the at least 3 said first upper hook points are disposed near each of the longitudinal ends of said support structure.
- two of said hooking points are disposed near a first longitudinal end, the other said hooking point being disposed on the side of the opposite longitudinal end of said support structure. It will be understood that all of said upper hooking points are half distributed on one side of a diameter of said circle and for the other half on the other side of said diameter, so that preferably the resultant of the tensions exerted by said tendons at their so-called upper hook points on said rigid structure is applied near the center of gravity of said rigid structure substantially corresponding to the center of said circle.
- all said upper hooking points are distributed so as to be arranged symmetrically with respect to the center of said circle. More particularly, at least two said upper hooking points are diametrically opposed and disposed near respectively each of the opposite longitudinal ends of said support structure.
- said upper hook points according to the present invention are arranged and spaced in a plane of horizontal section of said structure so that at least two upper hook points inscribed in said circle (C) are arranged to respectively close to each of the opposite longitudinal ends of said support structure and at least two said upper hooked points inscribed on the circle (C) are arranged close to each end respectively opposite transverse of said support structure, said transverse direction being the direction perpendicular to the longitudinal direction of said support structure in said horizontal section plane. More particularly, when there are only three upper hooked points inscribed on a said circle, they are preferably arranged to form an isosceles triangle.
- said support structure has a longitudinal shape of substantially rectangular section in horizontal section, preferably substantially symmetrical with respect to a median longitudinal vertical plane (YZ), the device comprising at least 6 tendons, each connected to a said device for variation of distance and said support structure comprises at least 6 said upper hook points 4 points of which hooked upper define the 4 angles of a rectangle, the other two points of upper hook being arranged inside a circle ( C) circumscribed in said rectangle, preferably at or near the two great lengths of the rectangle, preferably at the level of the transverse median axis (XX ') of said rectangle, the 4 corner hooking points being arranged in the vicinity longitudinal ends of said support structure.
- YZ median longitudinal vertical plane
- This form of support structure is the most practical to support a plurality of chutes arranged in parallel juxtaposed laterally and successively in said longitudinal direction.
- the other 5 tendons arranged in trapezium ensure stabilization of the support structure during the replacement of said tendon to be replaced.
- the trapezium is would turn into an unstable triangle.
- said support structure comprises two parts articulated in rotation about an axis of rotation (XI ⁇ ), substantially horizontal, preferably median, adapted to allow relative rotation of each of said two articulated parts one relative to each other, at an angle of -10 ° to + 10 °, preferably -5 ° to + 5 °, said rotation being limited by upper stops and lower stops of each of said two articulated parts of support structure, the two said articulated portions of support structure being preferably symmetrical with respect to a median vertical plane passing through said axis of rotation (XI ⁇ ), each of said two hinged portions being connected to said base by at least three so-called tendons of which at least one, preferably all three, are (are) connected (s) to one of its (their) ends to a distance variation device.
- XI ⁇ axis of rotation
- each said articulated portion of said support structure has a longitudinal shape of substantially rectangular section in horizontal section, preferably substantially symmetrical with respect to a median longitudinal vertical plane (YZ), the device comprising at least 6 tendons each connected to a said distance variation device, and said support structure comprises at least 6 upper attachment points, each said articulated part of said support structure comprising at least:
- the upper hooking points of said first hinged portion of the support structure are arranged symmetrically, at the three upper hooking points of the second hinged portion of the support structure with respect to the substantially vertical plane passing through said axis of rotation. preferably in isosceles triangle.
- This embodiment in two articulated parts is particularly advantageous for very large support structures, because it reduces the overall rigidity and facilitates the adjustment of tendon tensions due to the relative independence of the tendons of each of the two half structures.
- the distance variation device may be a cable system with a said point hooked at its end cooperating with and drums, pulleys and / or winches or preferably a device of the linear actuator type of variable length, preferably of the type cylinder, either a mechanical cylinder or a hydraulic cylinder.
- said support structure supports a plurality of chutes, preferably at least 5 troughs, offset laterally parallel in a direction ( ⁇ ') of said support structure, said chutes being arch-shaped preferably arranged symmetrically by relative to a vertical longitudinal axial plane (YZ) of said support structure.
- the present invention also provides a method for modifying the tensions to which the various tendons of a support device according to the invention are subjected, characterized in that at least one said distance variation device is actuated so as to adjust the tension of said tendon to which it is connected to a desired controlled value.
- the present invention also provides a method according to the invention characterized in that the voltage of a said tendon by operating a said distance variation device to which it is connected and then performs the replacement of the tendon.
- the present invention also provides a method according to the invention characterized in that the mechanical connection of the different tendons at said support structure is rendered mechanically quasi-isostatic by actuating at least one said distance variation device.
- FIG. 3A is a front view in the YZ plane of an installation according to the invention comprising a structure integral with a plurality of integrated floats 6a to said structure, supporting a plurality of troughs, namely six chutes 4a to 4f, said structure being anchored by six tendons 7 hooked at six points hooked upper 7al to 7a6, -
- Figures 3B and 3C are views from below of the structure 5 horizontal section (XY plane) rectangular relative to Figure 3A detailing the arrangement in a rectangle of the six points of hanging upper 7al to 7a6 of the six tendons,
- FIG. 6 is an alternative embodiment of a distance variation device comprising a jack equipped with a hydraulic pressure gauge 11c of the jack according to the invention.
- FIGS. 7A to 7C show an embodiment in which said support structure 5 comprises two parts articulated in rotation 5-1, 5-2 with respect to a median axis ⁇ 1 ⁇ .
- FIG. 1 shows a bottom-surface connection installation comprising two flexible pipes or electric cables 1a, 1b connected at one end 2a to a floating support 2, held in position by anchoring lines 2b, the other end said flexible pipes lying substantially at the bottom of the sea 3.
- the flexible pipes 1a, 1b are in descending downward chain configuration from the floating support 2, to a point of horizontal tangency, respectively the ', lb', then in ascending chain configuration to the inlet 4al of a chute, respectively 4a and 4b, whose radius of curvature R is greater than the minimum radius of curvature acceptable by said flexible pipes or said cables.
- the flexible pipe enters 4al in the chute 4a, then rests on said chute and spring 4a2 to join in single chain configuration lal, the sea floor 3 substantially in the.
- Each of the chutes 4a, 4b, etc. is positioned laterally offset, relative to each other, on the structure 5, as shown in Figures 2B and 3A.
- the support structure 5 is maintained substantially at an altitude h with respect to the seabed by virtue of a plurality of tendons 7 connected at their upper ends to points of upper hooking 7a to said structure 5 and their lower ends to points of contact. hooked lower 7b to a base 8 resting on the seabed 3, for example a base weight, or a suction anchor sunk into the ground hereinafter foundation.
- the device according to the invention advantageously anchors the structure 5 by means of at least 6 tendons, preferably distributed symmetrical manner on either side of the YY axis of said structure 5 as shown in bottom view on the Figure 3B.
- Each of the upper hooking points 7al-7a2-7a3-7a4-7a5-7a6 of the structure is connected to the corresponding lower hooked point, not shown, respectively 7bl-7b2-7b3-7b4-7b5-7b6, by the intermediate of a tendon, respectively 7i-7 2 -7 3 -7 4 -7 5 -7 6 , all the tendons are preferably parallel to each other and vertical.
- two intermediate upper hooking points 7a3 and 7a4 are offset on either side of the median transverse axis XX of the structure and offset along XX to the outside of the long sides of the rectangle, such that they are secured to said structure 5, but corbelled.
- a small side of the rectangle is bordered by 2 hanging points upper angle 7al, 7a2, the opposite side of the rectangle in the longitudinal direction having a single point hooked upper 7a6 in the middle position.
- the set of upper hook points of the tendons is then on or inside the circle C circumscribing the rectangle formed by the four points of the upper hook 7al, 7a2, 7a5, 7a6 at the four angles (fig.3D) or the circle circumscribing the triangle formed by the 3 points of upper hanging 7al, 7a2 and 7a6 (fig.3E).
- a non-symmetrical configuration such as in FIGS. 3C, 3D or 3E will advantageously be suitable in certain cases for disparities in the sizes of flexible pipes, that is to say of disparities in the vertical forces induced by these pipes and their respective location. on said structure 5 as well as in the distribution of the buoyancy elements.
- quadsi-isostatic the fact that all the tendons collaborate to the recovery of the tension created by the resultant buoyancy directed upwards and that each of said tendons substantially returns a known and adjustable percentage of said overall tension.
- the device for variation of distance and quasi-isostatic adjustment 10 allows, at each of the tendons of the device, and individually, to adjust the distance between the base 8 and the structure 5, and of thus distribute in a perfectly controlled manner the unit load in each of said tendons, so to make the device almost isostatic.
- the altitude L with respect to the foundation 8, of the lower hooking point 7b of the tendon 7 can be adjusted by means of the distance variation device 10 represented here as being a hydraulic cylinder with a mechanical locking rod, known of the man of the art.
- Said distance variation device 10 consists of a cylinder body 10a integral with the base, and a cylinder rod 10b at the top of which is the bottom hooked point 7b of the tendon 7.
- the axis of said cylinder 10a-10b is preferably vertical.
- the cylinder body 10a is provided with an orifice 11 making it possible to connect via a conduit 11a to said jack to a hydraulic power unit (not shown) available on board an ROV 13, an automatic submarine piloted from an installation vessel 14 surface.
- the jack rod is forced to retract in length downwards and the distance between the base 8 and the structure 5 and thus the lengths is thus adjusted and reduced, which has the effect of effect of increasing the tension at the tendon concerned.
- this advantageously distributes and perfectly controlled the load that resumes each of the tendons, which makes the whole "quasi-isostatic".
- the pressurization or depressurization of a said cylinder makes it possible to adjust the distance between the foundation 8 and the upper hook point 7a at each of the tendons and individually, and therefore to adjust the percentage of the global tension T taken individually by said tendon.
- a locking device is actuated at position 12-12a of the rod 10b of the jack, then the pressure of the jack is released and the hydraulic supply hose 11a is disconnected.
- FIG. 5 is shown on the right the distance variation device 10 relative to the tendon 7 2 in the locked position 12a at the altitude L2, and on the left, the distance variation device 10 relative to the tendon 7i being adjusted to the altitude L1, the ROV 13 (automatic underwater intervention driven from the surface) connected by the conduit 13a to the port of pressurization 11 being adjusting the pressure P of the cylinder, so the tension in said tendon ⁇ x .
- the locking device 12 is kept in the open position 12b, so the cylinder is free to move in elongation or retraction.
- each of the tendons 7 it is generally preferred to equip each of the tendons 7 with its own distance variation device 10.
- n-2 distance variation devices 10 the two non-adjustable tendons, preferably located at the opposite longitudinal ends of the structure 5, then define the substantially horizontal axis of anchoring reference of the structure 5 vis-à-vis the base 8, l adjustment of each of the other tendons then makes it possible to make the system almost isostatic, so allows the load to be distributed in a controlled manner on each of the tendons.
- each of the tendons has a distance variation device 10 for adjusting the length of the tendons, it is then easy to carry out maintenance operations consisting of changing any of the tendons, without disturbing the functioning of the device, so without the need to stop oil production. Indeed, all that is needed is:
- This provides a permanent display of the tension of each of the tendons, this voltage being correlated to said cylinder pressure, and this display can be very simply consulted during routine inspections performed at regular intervals, for example by a ROV 13
- the information can then be transmitted automatically and permanently to the FPSO, either by an electric cable or acoustically, and it is then possible to of the command, a perfectly precise state of the set of flexible arches and their anchoring system.
- the command will be instantly informed, and if necessary will be able to determine the defective tendon.
- the overall vertical tension will decrease and some tendons 7 will see their tension drop. The command of the FPSO will then be quickly informed and will be able to initiate the corrective actions.
- each said hinged portion 5-1, 5-2 of said support structure 5 has a longitudinal section substantially rectangular in horizontal section, substantially symmetrical with respect to a median longitudinal vertical plane (YZ), each said articulated portion 5-1, 5-2 of said support structure 5 comprising:
- the upper 3 hook points 7al-7a2-7a3 of said first hinged portion of the support structure 5-1 are arranged in isosceles triangle symmetrically to the three upper hung points 7a4-7a5- 7a6 of the second hinged portion of the support structure 5 -2 with respect to the substantially vertical plane passing through said axis of rotation ,.
- buoying support both a barge or vessel that a semi-submersible platform of the type described above.
- said upper part of the support structure, supporting or on which are fixed said troughs according to the present invention is a rigid structure other than a float.
- a said flexible pipe is held in a said chute by retaining means and / or hooking means. This feature aims to stabilize all the flexible pipes and to promote the stresses and displacements in said first portion of said flexible pipes.
- Said support structure may also support chutes for guiding and supporting flexible lines other than said flexible pipes and therefore smaller diameter.
- the radius of curvature of the various troughs has been shown in the various figures to be identical, but it will advantageously adopt radii of curvature adapted to each of the pipes, which will minimize the weight of the assembly and thus reduce the necessary buoyancy .
- said device 10 as being secured to one of its ends is the base 8 or the structure 5, the other end being secured to the tendon, but said device 10 may also be secured to one side of said tendon and the other , an articulated connection, for example a second tendon, the latter being secured at its other end is the base 8 or the structure 5.
- said device 10 is disposed between a first tendon and a second tendon however, this particular provision is not the preferred version of the invention.
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Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14729411.0A EP2997220B1 (fr) | 2013-05-13 | 2014-05-12 | Dispositif d'ancrage d'un support de goulottes d'une installation fond-surface |
US14/890,863 US9702109B2 (en) | 2013-05-13 | 2014-05-12 | Device for anchoring a raceway mounting of a seabed-to-surface facility |
BR112015028130-3A BR112015028130B1 (pt) | 2013-05-13 | 2014-05-12 | Dispositivo de ancoragem de um suporte de caleiras de uma instalação fundo-superfície, instalação de ligações fundo-superfície e método de modificação das tensões |
AU2014267082A AU2014267082B2 (en) | 2013-05-13 | 2014-05-12 | Device for anchoring a raceway mounting of a seabed-to-surface facility |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1354277A FR3005484B1 (fr) | 2013-05-13 | 2013-05-13 | Dispositif d'ancrage d'un support de goulottes d'une installation fond-surface |
FR1354277 | 2013-05-13 |
Publications (1)
Publication Number | Publication Date |
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WO2014184480A1 true WO2014184480A1 (fr) | 2014-11-20 |
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Family Applications (1)
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PCT/FR2014/051096 WO2014184480A1 (fr) | 2013-05-13 | 2014-05-12 | Dispositif d'ancrage d'un support de goulottes d'une installation fond-surface |
Country Status (6)
Country | Link |
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US (1) | US9702109B2 (fr) |
EP (1) | EP2997220B1 (fr) |
AU (1) | AU2014267082B2 (fr) |
BR (1) | BR112015028130B1 (fr) |
FR (1) | FR3005484B1 (fr) |
WO (1) | WO2014184480A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUB20152181A1 (it) * | 2015-07-15 | 2017-01-15 | Saipem Spa | Dispositivo di appoggio di almeno una porzione di una struttura lineare per l’attraversamento di una topografia subacquea sconnessa, assieme comprendente detto dispositivo e metodo di appoggio |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3033358B1 (fr) * | 2015-03-06 | 2017-03-31 | Saipem Sa | Installation comprenant au moins deux liaisons fond-surface comprenant des risers verticaux relies par des barres articulees |
CN107217999B (zh) * | 2017-07-13 | 2024-05-14 | 安世亚太科技股份有限公司 | 海洋钻探立管上部连接装置 |
CN112528382B (zh) * | 2020-12-21 | 2023-09-26 | 黄河勘测规划设计研究院有限公司 | 多级平台的平马道三维自动开挖设计方法 |
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-
2014
- 2014-05-12 US US14/890,863 patent/US9702109B2/en active Active
- 2014-05-12 BR BR112015028130-3A patent/BR112015028130B1/pt active IP Right Grant
- 2014-05-12 EP EP14729411.0A patent/EP2997220B1/fr active Active
- 2014-05-12 AU AU2014267082A patent/AU2014267082B2/en active Active
- 2014-05-12 WO PCT/FR2014/051096 patent/WO2014184480A1/fr active Application Filing
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ITUB20152181A1 (it) * | 2015-07-15 | 2017-01-15 | Saipem Spa | Dispositivo di appoggio di almeno una porzione di una struttura lineare per l’attraversamento di una topografia subacquea sconnessa, assieme comprendente detto dispositivo e metodo di appoggio |
WO2017009807A1 (fr) * | 2015-07-15 | 2017-01-19 | Saipem S.P.A. | Dispositif support pour au moins une portion d'une structure linéaire servant à traverser une topographie immergée irrégulière, ensemble comprenant ledit dispositif et procédé de support |
Also Published As
Publication number | Publication date |
---|---|
FR3005484A1 (fr) | 2014-11-14 |
AU2014267082A1 (en) | 2015-11-12 |
BR112015028130B1 (pt) | 2022-01-11 |
EP2997220A1 (fr) | 2016-03-23 |
FR3005484B1 (fr) | 2017-12-22 |
US20160115667A1 (en) | 2016-04-28 |
BR112015028130A2 (pt) | 2017-07-25 |
AU2014267082B2 (en) | 2016-07-07 |
US9702109B2 (en) | 2017-07-11 |
EP2997220B1 (fr) | 2020-07-08 |
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