Key information

Title
A suction pile having a tubular skirt and method of installing such
Application number
20191510
Case type
National
Status
09.12.2024 Patent meddelt (B1)
Filed
20.12.2019
Effective date
20.12.2019
Publicly available
21.06.2021
Next annual fee due
31.12.2026
Applicant
Subsea 7 Norway AS (NO)
Owner
Subsea 7 Norway AS (NO)
Inventor
Christian Linde Olsen (NO) et al.
Agent
ZACCO NORWAY AS (NO)
Granted
09.12.2024
Patent number
348361
Expiry date
20.12.2039

Abstract and drawing

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.
A tubular skirt of a suction pile comprises a water-permeable porous material that presents at least one porous external surface for engaging and draining seabed soil. The suction pile is installed by embedding the pile in seabed soil and draining water from the seabed soil adjoining the pile through the porous external surface, in particular into and through a body of porous material that defines the porous external surface. The body of porous material may be a layer or coating applied to an impermeable supporting wall or may extend through the full wall thickness of the skirt. Suction may be applied to the body of porous material to promote and accelerate drainage of water from the seabed soil.

Publications

B1A1
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Documents

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Date
 Date Doc. No. Process Case number In/Out Journal description To/from
 13.12.2024 12-01 Saksbehandling 20191510(348361) UT PT Registreringsbrev nasjonal patent (15) (PT20191510)
02.11.2024 11-01 Saksbehandling 20191510 UT Intention to grant ZACCO NORWAY AS
 04.08.2024 10-03 Saksbehandling 20191510 INN P304288NO00-Claims-NO ZACCO NORWAY AS
 04.08.2024 10-02 Saksbehandling 20191510 INN P304288NO00 Response letter ZACCO NORWAY AS
 04.08.2024 10-01 Saksbehandling 20191510 INN Korrespondanse (Hovedbrev inn) ZACCO NORWAY AS
 04.08.2024 09-03 Saksbehandling 20191510 INN P304288NO00-Claims-NO ZACCO NORWAY AS
 04.08.2024 09-02 Saksbehandling 20191510 INN P304288NO00 Response letter ZACCO NORWAY AS
 04.08.2024 09-01 Saksbehandling 20191510 INN Korrespondanse (Hovedbrev inn) ZACCO NORWAY AS
 22.05.2024 08-01 Saksbehandling 20191510 UT 20191510_1853162_PT 08 Eng ZACCO NORWAY AS
 05.02.2024 07-04 Saksbehandling 20191510 INN Specification and claims_track changes ZACCO NORWAY AS
 05.02.2024 07-03 Saksbehandling 20191510 INN Specification and claims_clean ZACCO NORWAY AS
 05.02.2024 07-02 Saksbehandling 20191510 INN Response Letter to NIPO ZACCO NORWAY AS
 05.02.2024 07-01 Saksbehandling 20191510 INN Korrespondanse (Hovedbrev inn) ZACCO NORWAY AS
 04.11.2023 06-01 Saksbehandling 20191510 UT 20191510_1773960_PT 08 Eng ZACCO NORWAY AS
 02.11.2021 05-01 Saksbehandling 20191510 UT PT Varsel om betaling av første årsavgift (3317) (PT20191510)
06.01.2021 04-04 Saksbehandling 20191510 INN P61904321NO00_Response Letter to NIPO ZACCO NORWAY AS
 06.01.2021 04-03 Saksbehandling 20191510 INN P61904321NO00_Amended specification and claims marked ZACCO NORWAY AS
 06.01.2021 04-02 Saksbehandling 20191510 INN P61904321NO00_Amended specification and claims clean ZACCO NORWAY AS
 06.01.2021 04-01 Saksbehandling 20191510 INN Korrespondanse (Hovedbrev inn) ZACCO NORWAY AS
 20.07.2020 03-02 Saksbehandling 20191510 UT PT report 03:31:32
20.07.2020 03-01 Saksbehandling 20191510 UT Realitet patent ZACCO NORWAY AS
 03.01.2020 02-01 Saksbehandling 20191510 UT Infobrev til oppfinner ZACCO NORWAY AS
 20.12.2019 01-07 Saksbehandling 20191510 INN Patenttegninger ZACCO NORWAY AS
 20.12.2019 01-06 Saksbehandling 20191510 INN Sammendrag ZACCO NORWAY AS
 20.12.2019 01-05 Saksbehandling 20191510 INN Krav ZACCO NORWAY AS
 20.12.2019 01-04 Saksbehandling 20191510 INN Beskrivelse ZACCO NORWAY AS
 20.12.2019 01-03 Saksbehandling 20191510 INN Erklæring Søkers rett til oppfinnelse ZACCO NORWAY AS
 20.12.2019 01-02 Saksbehandling 20191510 INN Fullmakt ZACCO NORWAY AS
 20.12.2019 01-01 Saksbehandling 20191510 INN Søknadsskjema Patent ZACCO NORWAY AS

Description, claims and drawings

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content. Description
A suction pile having a tubular skirtThis invention relates to hollow, especially tubular, subsea foundations that are designed to be embedded into the seabed, especially suction piles. The invention relates particularly to the challenges of accelerating settlement of suction piles in seabed soil so that they are ready to be used quickly.The invention aims to simplify and accelerate the installation of embedded subsea foundations. The invention also aims to improve the resistance to movement of embedded subsea foundations once they are installed.The invention shortens the post-installation period that is required for the soil immediately surrounding the foundation to regain sufficient strength, hence allowing such foundations to be ready for use more quickly than was previously possible. This enables overall project timescales to be shortened substantially. In principle, the invention may also allow the size and hence the cost of embedded subsea foundations to be reduced without sacrificing their capacity to resist break-out loads.Suction piles, as exemplified in US 4432671, are commonly used in the subsea oil and gas industry for supporting or anchoring large offshore installations in deep water. Such piles are therefore designed to engage the soft seabed soils that characterise deep water, typically comprising marine sediments or soft clays.Suction piles are also known in the art as suction anchors, suction cans, suction caissons or suction buckets. The design of such foundations may be determined with reference to standards such as DNV-RP-E303, entitled Geotechnical Design and Installation of Suction Anchors in Clay.Suction piles engage the seabed soil by friction and/or by cohesion attributed to van der Waal forces. The engagement mechanism depends upon the composition of the soil. For example, engagement of a suction pile with a sandy seabed is based more on friction whereas engagement with a clay seabed is based more on cohesion.A suction pile is usually fabricated from steel and typically comprises a deep cylindrical skirt defining an open-bottomed hollow straight tube. The skirt engages the seabed soil by friction or cohesion upon being embedded axially into the soil. The top of the skirt is closed by a steel top plate. This defines a suction chamber between the top plate, the skirt and the seabed soil trapped within the embedded skirt. Underpressure in the suction chamber also promotes engagement of the suction pile with the seabed. The undrained condition of the seabed soil makes suction very efficient.When a suction pile is landed on the seabed in an upright orientation, the skirt embeds partially into the seabed soil under the self-weight and momentum of the pile. The soil within the embedded skirt closes the bottom of the pile to create the suction chamber. When seawater is subsequently pumped out of the suction chamber as disclosed in GB 1451537, the resulting underpressure in the chamber draws the top plate toward the seabed. This causes the skirt to sink further into the soil as the suction chamber contracts under external hydrostatic pressure, hence effecting fuller engagement of the suction pile with the seabed. In deep water, suction is generally applied by using a remotely-operated vehicle or ROV to pump water from the suction chamber.Consequently, a suction pile engages with the seabed by virtue of a combination of friction or cohesion and suction. The installation method reflects these factors, firstly by allowing the pile to self-penetrate under its own weight into the seabed and secondly, after a short period of settlement, by pumping water out of the resulting suction chamber to apply suction.Self-penetration of the pile ends when resistance to relative sliding movement between the skirt and the seabed soil balances the weight of the pile. Suction overcomes that resistance to force the skirt deeper into the seabed, hence enabling the pile to resist forces that will be applied after installation by equipment subsequently anchored to or supported on the pile.Additional settlement occurs over time in the days, weeks or even months following installation. Specifically, the soil around and within the skirt of the pile that was disturbed by penetration requires the partial pressure of water between the particles or grains of the soil to re-balance. Effective circulation or drainage of water can improve strengthening of the soil within an allotted time period and so allow the size of the pile to be reduced.Once embedded into the seabed soil and then left for a period sufficient for the surrounding soil to regain enough of its strength, a suction pile can serve as a support or as an anchor for various types of subsea or surface equipment. For example, suction piles may be used for mooring or tethering a floating platform, a surface vessel such as an FPSO or a subsea riser-supporting buoy.The top plate serves as a convenient interface with the equipment that the suction pile is intended to anchor or otherwise to support. For example, the top plate may provide an attachment point for a mooring line or a tether. However, it is also common for a mooring line to be attached to the skirt of a suction pile.Conventional suction piles may not have enough load-bearing capacity, soon after installation, to support large loads in soft soils. In principle, piles could simply be made bigger to increase the capacity that they can attain within a certain period of time. However, a sufficiently large pile could be too large to lift and install safely using an available offshore crane. More generally, large piles are correspondingly expensive to fabricate, to transport and to install.EP 1268947 discloses suction piles with outer compartments for pumping out water. GB 2277547 similarly describes a suction pile whose skirt has a second, outer wall defining a narrow gap between the outer wall and the main wall. This is particularly to increase penetration speed. KR 20150052618 also suggests a specific water circulation path.In order to address drainage, the bottom of the skirt may comprise windows as disclosed in EP 1954557. However, such windows affect soil settlement only negligibly. To the contrary, the windows are designed to allow water to escape from within a freefalling pile in the moments after the bottom of the skirt first encounters the seabed, hence to facilitate dynamic penetration of the pile into the seabed soil. Once the pile penetrates to such a depth that the soil closes off the windows to allow suction to be applied, the windows have served their purpose and therefore are redundant from that point onwards.Other drainage arrangements for foundations are shown in DE 10324161, CN 108316334 and KR 20150105083.There remains a need to improve the performance of hollow foundations in soft seabed soil, without necessarily increasing their size. This allows smaller cranes and vessels to be used for installation, greatly reducing the cost of installation and increasing the availability of suitable marine assets. The need also remains for hollow foundations of a given size and target capacity to be ready for use as soon as possible after installation.Against this background, the invention may be defined as a suction pile having a tubular skirt that comprises a water-permeable porous material presenting at least one porous external surface for engaging and draining seabed soil when the pile is embedded for use. The porous material is either applied as coatings or layers to opposed sides of an underlying tubular or part-tubular wall of the skirt, or the porous material extends through a full wall thickness of the skirt. The porous material could be selected from: a polymer material; a metallic foam material; a fibre-reinforced composite material; a concrete-based foam material; a geomaterial; or a combination of any two or more of those materials.The wall of the skirt supporting the porous material may be made of an impermeable material such as steel plate. The porous material may be applied to, for example, a convex outer side and a concave inner side of a tubular wall.In the alternative approach where the porous material extends through a full wall thickness of the skirt, the porous material may be formed with a tubular or part-tubular shape.The porous material is suitably located at a lower portion of the skirt that depends from an upper portion of the skirt made of an impermeable material.The porous material may be in fluid communication with a suction device of the pile. For example, a structural wall of the pile supporting the porous material may be penetrated by passageways that effect fluid communication between the porous material and a hollow interior of the pile, bounded by that wall, in fluid communication with the suction device. More generally, an internal surface of the porous material may be exposed to a suction chamber that is in fluid communication with the suction device. Such a suction chamber could be defined between mutually-spaced walls of the skirt, at least one of which walls is made of the porous material.The porous material is preferably substantially continuous in a circumferential direction around the skirt and in a longitudinal direction along the skirt. The porous material could be made by an additive manufacturing process, and is preferably of an open-cell configuration.The inventive concept also embraces a corresponding method of installing a suction pile having a tubular skirt. The method comprises: embedding the pile in seabed soil; and draining water from the seabed soil adjoining the pile on radially-inner and radiallyouter sides of the skirt through porous external and internal surfaces of the pile. The porous surfaces of the pile are defined by porous material that is applied as a coating or layer to opposed sides of an underlying tubular or part-tubular wall of the skirt, or by porous material that extends through a full wall thickness of the skirt.The water may, for example, be drained into and through a body of porous material that defines the porous external surface of the pile.Suction may be applied to the body of porous material, for example to an internal side of that body opposed to the porous external surface of that body in contact with the seabed soil.Elegantly, suction may be applied to the porous material using a suction system of the pile that also effects embedment of the pile into the seabed soil.Preferably, water is drained from seabed soil across at least a majority of a radiallyouter surface of the skirt.Quicker drainage of seabed soil along the skirt of a suction pile means that a required level of strength is achieved faster. This could lead to higher-capacity suction piles and therefore a reduction in their size, or to suction piles that can be brought into use sooner.For this purpose, the invention envisages the possibility of making at least part of the outer surface, or potentially the outer and inner surfaces, of a suction pile foraminous or porous. Porosity could, for example, be achieved by 3D printing in glass fibrereinforced plastics (GRP) and/or metal, such as a thermoplastic with GRP reinforcement.The porous surface allows overpressure in water in surrounding seabed soil to drain and equalise after installation much sooner than otherwise, hence allowing the strength of the foundation to increase more quickly. To accelerate the process of drainage and equalisation, the porous material may be connected to a pump in fluid communication with the porous surface, for example through a layer or body of porous material that defines the porous surface.Drainage of seabed soil may be one-way or two-way, in each case being in a direction toward the porous surface of the skirt adjoining the soil. One-way drainage involves water draining inwardly against an outer, typically convex surface of the skirt. Two-way drainage involves water also draining outwardly against an inner, typically concave surface of the skirt.The skirt may have at least one non-porous section whose height, along the length of the pile, can be adjusted to accommodate mixed soils. The skirt may comprise a nonpermeable membrane or a plate with porous material on one or both sides.The invention also contemplates 3D printing of suction piles with porous material and suction piles having a porous surface, not necessarily 3D printed.Embodiments of the invention provide a suction pile for installation in water, the pile comprising a top and a lateral skirt, at least part of which skirt comprises a porous material.The skirt wall may, for example, be non-porous and may be coated at least externally with the porous material.A top section of the skirt may be non-porous and a bottom section of the skirt may comprise a porous material, either being made of a porous material or being coated with a porous material.The porous material may be selected from: a polymer; a metallic foam; a fibrereinforced composite material; a concrete-based foam; or a geomaterial. The porous material could be manufactured by additive manufacturing. The porous material suitably has an open-cell configuration defining a multiplicity of drainage channels that extend into and through the material.Embodiments of the invention also implement a method for installing a suction pile in the seabed, the method comprising: providing a suction pile with an at least partially porous skirt; self-penetrating the suction pile; applying suction to an inner compartment of the suction pile; and pumping until sufficient additional drainage occurs.In summary, a tubular skirt of a suction pile of the invention comprises a waterpermeable porous material that presents at least one porous external surface for engaging and draining seabed soil. The suction pile is installed by embedding the pile in seabed soil and then draining water from the seabed soil adjoining the pile through the porous external surface, in particular into and through a body of porous material that defines the porous external surface.The body of porous material may be a layer or coating applied to an impermeable supporting wall or may extend through the full wall thickness of the skirt. Suction may be applied to the body of porous material to promote and accelerate drainage of water from the seabed soil.In order that the invention may be more readily understood, reference will now be made, by way of example, to the accompanying drawings in which:Figure 1 is a schematic side view of a subsea suction pile embedded in seabed soil, as known in the prior art;Figure 2 is a schematic side view of a suction pile of the invention in longitudinal section, coated with a layer of a porous material on an outer side of the skirt;Figures 3a and 3b are enlarged sectional detail views of a skirt of a suction pile of the invention, showing the effect of optional pumped suction through or into the skirt to promote absorption of water by the layer of porous material;Figure 4 is a schematic side view of a suction pile of the invention in longitudinal section, coated with layers of a porous material on inner and outer sides of the skirt;Figure 5 is a schematic side view of a suction pile of the invention in longitudinal section, in which a lower portion of the skirt is made of a porous material; Figure 6 is a schematic side view of a suction pile of the invention in longitudinal section, in which the skirt has a twin-walled configuration to apply suction to a porous material constituting a lower portion of the skirt; andFigure 7 is a perspective view of a porous 3D-printed material that may be used to form or to coat the skirt of a pile of the invention.The known suction pile 10 shown embedded in seabed soil 12 in Figure 1 comprises a cylindrical skirt 14 that defines an open-bottomed hollow straight tube. The skirt 14 is rotationally symmetrical around an upright central longitudinal axis 16.The top of the skirt 14 is closed by a top plate 18 to define a suction chamber between the top plate 18, the skirt 14 and the seabed soil 12 that is trapped within the open bottom of the skirt 14. Seawater is pumped out of that suction chamber via a pump 20 or fluid coupling shown on the top plate 18. Activating the pump 20 or drawing seawater out through a corresponding fluid coupling advances the suction pile 10 downwardly in a forward or distal direction to complete engagement of the pile 10 with the seabed soil 12 by further penetration.The suction pile 10 of the prior art as shown in Figure 1 suffers from the problem that, initially, its resistance to distal penetration movement substantially equates to its resistance to opposite proximal break-out movement under the upward load of a mooring or the like. Thus, expressed another way, a suction pile 10 that is easy to force down into engagement with the seabed soil 12 is approximately as easy to pull up out of engagement with the seabed soil 12, at least while the adjacent seabed soil 12 remains disturbed.Resistance to break-out forces will improve as the disturbed seabed soil 12 surrounding the suction pile 10 settles, compacts and regains strength over a long period of time, for example several months. Until then, however, the suction pile 10 will not be ready for use.Time is precious in the art of subsea engineering. The invention therefore proposes various ways in which an embedded subsea foundation such as a suction pile can be installed quickly and easily and can attain a required break-out capacity quickly. In particular, the solutions proposed by the invention maximise the ultimate break-out capacity of the foundation without causing a corresponding increase in its size and cost. The proposed solutions also enable a subsea foundation to be modified to improve its resistance to break-out loads without suffering a corresponding increase in its resistance to penetration.Like numerals are used for like features in the Figures 2 to 6 of the drawings, which shows various embodiments of the invention.Figure 2 shows a suction pile 10 in which a non-permeable skirt 14, for example of substantially unperforated steel, is coated with a water-permeable, porous layer or coating 22 on its radially outer, convex side. In this example, the porous coating 22 extends continuously around the circumference of the skirt 14 and also extends continuously along most or substantially all of the height of the skirt 14 in a longitudinal direction parallel to the central longitudinal axis 16.The porous coating 22 defines a porous, water-absorbent outer surface that faces and adjoins the surrounding seabed soil 12 when the skirt 14 is embedded by selfpenetration and then by suction upon installation. Water from the seabed soil 12 therefore soaks into and flows through the porous coating 22.The porous coating 22 thereby provides multiple drainage paths for water in the seabed soil 12 that was disturbed by the skirt 14 upon installation of the pile 10. The general direction of the drainage paths are radially inward with respect to the central longitudinal axis 16 as shown in Figure 2, hence toward the convex outer side of the skirt 14 from the seabed soil 12 surrounding the pile 10.Drainage allows the pressure of water between grains or particles of the soil 12 to stabilise, thereby accelerating consolidation and strengthening of the soil 12 around the pile 10.The porous coating 22 helpfully increases the surface area of the interface between the skirt 14 and the seabed soil 12. Over time, particles of the seabed soil 12 leach into the porous coating 22. Thus, the seabed soil 12 enters the pores of, and so intermingles with, the porous coating 22. In this way, the porous coating 22 enhances mechanical engagement, friction and cohesion with the seabed soil 12 to increase the resistance of the pile 10 to withdrawal loads. Optionally, as shown in Figures 3a and 3b, the skirt 14 may be penetrated by an array of narrow passageways 24 that expose the inner side of the porous coating 22, adjacent to the skirt 14, to the low pressure of suction applied to the interior of the pile 10. By applying suction to the side of the porous coating 22 opposed to the side adjoining the seabed soil 12, water is more effectively and quickly drawn out from the seabed soil 12 and into the porous coating 22 as shown in Figure 3b. The water drawn into the porous coating 22 may also flow or migrate out of the porous coating 22, whether under the influence of suction or otherwise.The passageways 24 are narrow enough and few enough that their aggregate area does not significantly undermine the ability of the pump 20 to draw down and to maintain a sufficiently low pressure within the pile 10 to effect its embedment. For example, the passageways 24 may be substantially narrower than the wall thickness of the skirt 14 through which they extend.Figure 4 shows that the porous coating 22 could be applied to both the radially outer, convex side and the radially inner, concave side of a suction pile 10. The porous coatings 22 thereby provide multiple drainage paths on both the outer and inner sides of the pile 10, both of which are in contact with seabed soil 12. Here, the general direction of the drainage paths are again toward the underlying skirt 14 from the adjacent seabed soil 12, hence being radially inward on the outer side of the pile 10 and radially outward on the inner side of the pile 10 as shown in Figure 4.Figure 5 shows a variant in which at least part of the skirt 14 is made of a porous material extending through the full wall thickness of the skirt 14. Such a porous material is apt to be made with the desired size and shape by an additive manufacturing process such as 3D printing, but it could be made in other ways such as by moulding or machining or by assembling two or more skirt components.In this example, the porous material defines a lower portion 26 of the skirt 14 and so has a tubular or part-tubular form that is curved around the central longitudinal axis 16. The diameter and curvature of the lower portion 26 of the skirt 14 correspond to those of a steel upper portion 28 of the skirt 14, which may be non-permeable. The wall thickness of the lower portion 26 of the skirt 14 may also correspond to that of the upper portion 28 of the skirt 14 as shown. The relative longitudinal extents of the lower and upper portions 26, 28 of the skirt 14 may be selected to suit situations where the seabed soil 12 has a mixed or layered nature. It will be apparent from Figure 5 that the porous material of the lower portion 26 of the skirt 14 will present porous surfaces to the adjacent seabed soil 12 on the radially inner and radially outer sides of the skirt 14, thus creating bidirectional drainage paths in the manner of the embodiment shown in Figure 4.Figure 6 expands on the concept shown in Figure 5 by adding suction like the embodiment shown in Figures 3a and 3b. The embodiment shown in Figure 6 does so by providing a suction chamber 30 in an annular gap between concentric inner and outer walls of the skirt 14. Specifically, the lower portion 26 of the skirt 14 comprises radially-spaced inner and outer walls 26A, 26B of a porous material and the upper portion 28 of the skirt 14 comprises radially-spaced inner and outer walls 28A, 28B of an impermeable material such as steel.The annular gaps of the lower and upper portions 26, 28 are in fluid communication with each other and with the pump 20. Thus, suction applied by the pump 20 to the interior of the pile 10 is also applied to the annular gaps, and in particular to the annular gap that defines the suction chamber 30 between the porous inner and outer walls 26A, 26B of the lower portion 26 of the skirt 14. When the pile 10 is embedded in the seabed, this suction helps to draw water from seabed soil into and through the porous material of the inner and outer walls 26A, 26B.Turning finally to Figure 7, this drawing exemplifies the structure of a 3D-printed porous material 32 that could be used to coat, surround or form the skirt 14 in the preceding embodiments of the invention. The material comprises a lattice frame 34 of integrallyformed members that define and enclose open cells 36 between them. The cells 36 intercommunicate to define multiple drainage paths around and between the members of the frame 34, hence allowing water drained from the seabed soil to enter into, to traverse and to drain from a body of the material 32 that coats, surrounds or forms the skirt 14. As noted above, particles of the seabed soil may migrate into the cells 36 of the frame 34 to enhance mechanical engagement, friction and cohesion further over time.Many other variations are possible within the inventive concept. For example, the porous material on the skirt or forming the skirt could be circumferentially or longitudinally discontinuous, hence being present only in discrete areas of the skirt such as bands, stripes or patches. Conversely, the skirt could be made substantially entirely from a porous material.A porous coating may be applied to the skirt and cured in situ, may be bonded to the underlying skirt or may be a discrete porous layer or sleeve that is attached to the skirt, for example by circumferential bands, straps or other fastenings.
Claims
Claims1. A suction pile (10) having a tubular skirt (14) that comprises a water-permeable porous material (22, 26) presenting at least one porous external surface for engaging and draining seabed soil (12) when the pile (10) is embedded for use, characterised in that the porous material (22, 26) is applied as a coating or layer to opposed sides of an underlying tubular or part-tubular wall of the skirt (14), or the porous material (22, 26) extends through a full wall thickness of the skirt (14).2. The pile (10) of Claim 1, wherein the wall is made of an impermeable material.3. The pile (10) of any preceding claim, wherein the porous material (22, 26) is applied to a convex outer side and a concave inner side of the wall.4. The pile (10) of any preceding claim, wherein the porous material (22, 26) is formed with a tubular or part-tubular shape.5. The pile (10) of any preceding claim, wherein the porous material (22, 26) is located at a lower portion (26) of the skirt (14) that depends from an upper portion (28) of the skirt (14) made of an impermeable material.6. The pile (10) of any preceding claim, wherein the porous material (22, 26) is in fluid communication with a suction device (20) of the pile (10).7. The pile (10) of Claim 6, wherein a structural wall of the pile (10) supporting the porous material (22, 26) is penetrated by passageways (24) that effect fluid communication between the porous material (22, 26) and a hollow interior of the pile (10), bounded by that wall, in fluid communication with the suction device (20).8. The pile (10) of Claim 6, wherein an internal surface of the porous material (22, 26) is exposed to a suction chamber that is in fluid communication with the suction device (20).9. The pile (10) of Claim 8, wherein the suction chamber is defined between mutuallyspaced walls (26A, 26B, 28A, 28B) of the skirt (14), at least one of which walls (26A, 26B) is made of the porous material.10. The pile (10) of any preceding claim, wherein the porous material (22, 26) is substantially continuous in a circumferential direction around the skirt (14).11. The pile (10) of any preceding claim, wherein the porous material (22, 26) is substantially continuous in a longitudinal direction along the skirt (14).12. The pile (10) of any preceding claim, wherein the porous material (22, 26) is made by an additive manufacturing process.13. The pile (10) of any preceding claim, wherein the porous material (22, 26) is of open-cell configuration.14. The pile (10) of any preceding claim, wherein the porous material (22, 26) is selected from: a polymer material; a metallic foam material; a fibre-reinforced composite material; a concrete-based foam material; a geomaterial; or a combination of any two or more of those materials.15. A method of installing a suction pile (10) having a tubular skirt (14), the method comprising:embedding the pile (10) in seabed soil (12); anddraining water from the seabed soil (12) adjoining the pile (10) on a radiallyouter side of the skirt (14) through a porous external surface of the pile (10);characterised in that the method comprises draining water from the seabed soil (12) adjoining the pile (10) on a radially-inner side of the skirt (14) through a porous internal surface of the pile (10);and in that the porous surfaces of the pile (10) are defined by porous material (22, 26) that is applied as a coating or layer to opposed sides of an underlying tubular or part-tubular wall of the skirt (14), or by porous material (22, 26) that extends through a full wall thickness of the skirt (14).16. The method of Claim 15, comprising draining the water into and through a body of porous material (22, 26) that defines the porous external surface of the pile (10).17. The method of Claim 16, comprising applying suction to the body of porous material (22, 26).18. The method of Claim 17, comprising applying suction to an internal side of the body of porous material (22, 26) opposed to the porous external surface in contact with the seabed soil (12).19. The method of Claim 17 or Claim 18, comprising applying said suction to the porous material using a suction system (20) of the pile (10) that also effects embedment of the pile (10) into the seabed soil (12).20. The method of any of Claims 15 to 19, comprising draining water from seabed soil (12) across at least a majority of a radially-outer surface of the skirt (14).Patentkrav1. En sugepel (10) som har et rørformet skjørt (14) som omfatter et vanngjennomtrengelig porøst materiale (22, 26) som presenterer minst én porøs ytre overflate for å gripe inn og drenere havbunnsjord (12) når pelen (10) er nedgravd for anvendelse, karakterisert ved at det porøse materialet (22, 26) er påført som et belegg eller lag på motsatte sider av en underliggende rørformet eller delvis rørformet vegg av skjørtet (14), eller det porøse materialet (22, 26) strekker seg gjennom en full veggtykkelse av skjørtet (14).2. Pelen (10) ifølge krav 1, hvor veggen er laget av et ugjennomtrengelig materiale.3. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er påført på en konveks ytre side og en konkav indre side av veggen.4. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er utformet med en rørformet eller delvis rørformet fasong.5. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er lokalisert ved en nedre del (26) av skjørtet (14) som avhenger av en øvre del (28) av skjørtet (14) laget av et ugjennomtrengelig materiale.6. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er i fluidkommunikasjon med en sugeanordning (20) av pelen (10).7. Pelen (10) ifølge krav 6, hvor en strukturell vegg av pelen (10) som støtter det porøse materialet (22, 26) er penetrert av passasjer (24) som bevirker fluidkommunikasjon mellom det porøse materialet (22, 26) og et hult indre av pelen (10), avgrenset av den veggen, i fluidkommunikasjon med sugeanordningen (20).8. Pelen (10) ifølge krav 6, hvor en indre overflate av det porøse materialet (22, 26) er eksponert for et sugekammer som er i fluidkommunikasjon med sugeanordningen (20).9. Pelen (10) ifølge krav 8, hvor sugekammeret er definert mellom innbyrdes adskilte vegger (26A, 26B, 28A, 28B) av skjørtet (14), hvor minst én av veggene (26A, 26B) er laget av det porøse materialet.10. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er hovedsakelig kontinuerlig i en periferisk retning rundt skjørtet (14).11. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er hovedsakelig kontinuerlig i en langsgående retning langs skjørtet (14).12. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er laget med en additiv fremstillingsprosess.13. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er av åpen-celle konfigurasjon.14. Pelen (10) ifølge hvilket som helst foregående krav, hvor det porøse materialet (22, 26) er valgt fra: et polymermateriale; et metallisk skummateriale; et fiberforsterket komposittmateriale; et betongbasert skummateriale; et geomateriale; eller en kombinasjon av hvilke som helst to eller flere av disse materialene.15. En fremgangsmåte for å installere en suge-pele (10) som har et rørformet skjørt (14), hvor fremgangsmåten omfatter:å nedgrave pelen (10) i havbunnsjord (12); ogå drenere vann fra havbunnsjorden (12) som grenser til pelen (10) på en radiell ytre side av skjørtet (14) gjennom en porøs ytre overflate av pelen (10);karakterisert ved at fremgangsmåten omfatter å drenere vann fra havbunnsjorden (12) som grenser til pelen (10) på en radiell indre side av skjørtet (14) gjennom en porøs indre overflate av pelen (10);og ved at de porøse overflatene av pelen (10) er definert av porøst materiale (22, 26) som er påført som et belegg eller lag på motsatte sider av en underliggende rørformet eller delvis rørformet vegg av skjørtet (14), eller av porøst materiale (22, 26) som strekker seg gjennom en full veggtykkelse av skjørtet (14).16. Fremgangsmåten ifølge krav 15, som omfatter å drenere vannet inn i og gjennom et legeme av porøst materiale (22, 26) som definerer den porøse ytre overflaten av pelen (10).17. Fremgangsmåten ifølge krav 16, som omfatter å påføre sug til legemet av porøst materiale (22, 26).18. Fremgangsmåten ifølge krav 17, som omfatter å påføre sug til en indre side av legemet av porøst materiale (22, 26) motsatt den porøse ytre overflaten i kontakt med havbunnsjorden (12).19. Fremgangsmåten ifølge krav 17 eller krav 18, som omfatter å påføre nevnte sug til det porøse materialet ved å anvende et sugesystem (20) av pelen (10) som også bevirker nedgravning av pelen (10) inn i havbunnsjorden (12).20. Fremgangsmåten ifølge hvilket som helst av krav 15 til 19, som omfatter å drenere vann fra havbunnsjord (12) over minst en størstedel av en radielt ytre overflate av skjørtet (14).
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Patent classes

IPC classesE02D 27/52B63B 21/27CPC classesE02D 27/525B63B 21/27

Citations

DE 10324161 A1 (A1)CN 108316334 A (A)KR 20150105083 A (A)

Applicants, owners and inventors

Owners
Subsea 7 Norway AS
Kanalsletta 9 4033 STAVANGER NO (STAVANGER Municipality, Rogaland county)Org. number: 936742475Inventors
Christian Linde Olsen
Krokusstien 4 4022 STAVANGER NO (STAVANGER Municipality, Rogaland county)
Julien Hericher
Kvernhusveien 3A 4025 STAVANGER NO (STAVANGER Municipality, Rogaland county)
Jørgen Olsen
Nedre Teinebakken 13 4028 STAVANGER NO (STAVANGER Municipality, Rogaland county)

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ZACCO NORWAY AS
ZACCO NORWAY AS

Org. number: 982702887

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Org. number: 982702887
Reference: P304288NO00

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