GB2267107A - Flexible mudmats for offshore structures - Google Patents

Flexible mudmats for offshore structures Download PDF

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Publication number
GB2267107A
GB2267107A GB9204498A GB9204498A GB2267107A GB 2267107 A GB2267107 A GB 2267107A GB 9204498 A GB9204498 A GB 9204498A GB 9204498 A GB9204498 A GB 9204498A GB 2267107 A GB2267107 A GB 2267107A
Authority
GB
United Kingdom
Prior art keywords
offshore
offshore structure
foundation
flexible
structure foundation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9204498A
Other versions
GB9204498D0 (en
Inventor
Andrew Charles Stuart Wright
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sage Engineering A G
Original Assignee
Sage Engineering A G
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sage Engineering A G filed Critical Sage Engineering A G
Priority to GB9204498A priority Critical patent/GB2267107A/en
Publication of GB9204498D0 publication Critical patent/GB9204498D0/en
Publication of GB2267107A publication Critical patent/GB2267107A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/004—Sealing liners
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
    • E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Paleontology (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • Revetment (AREA)

Abstract

A flexible mudmat is made from cable nets and geotextile membrane covering which is stitched or bonded to the cables and fixed to the bottom of an offshore structure by means of pad eyes and shackles, to provide both temporary and permanent foundations for offshore structures. A soil retaining structure made from the same cable and membrane system surrounds such mudmats and is fixed to the legs of the structure by means of padeyes and shackles. These mudmat systems are lighter in weight than the conventional rigid mud mats which are constructed from steel, timber or aluminium, are fixed to the bottom of the structure and rest on or in the soil to provide support. As a result sea transport and installation costs are reduced. <IMAGE>

Description

FLEXIBLE MtJDMATS FOR OFFSHORE STRUCTURES This invention relates to the temporary and permanent foundations of an offshore structure.
Conventional offshore structures are founded on rigid foundations (mudmats) during installation and piling operations, which are constructed from steel, timber or aluminium.
The mudmats are fixed to the bottom of the jacket structure and rest on or in the soil to provide support for the structure.
In such constructions, the costs of sea transport and installation operations, including barge and tug rentals, pile driving, crane ship charter etc., are a very significant proportion of the total cost of the platform. In particular, when installing platforms on weak soils, very soft to firm clays, silts and loose silty sands, large mudmat areas are required which are very heavy and therefore result in the sea transport and installation costs being a significant proportion of the structure fabrication and equipment purchase cost.
Profitable exploitation of marginal oil and gas fields calls for cost savings in all areas of the development and there thus exists a strong incentive to economise on the sea transport and lifting costs by reducing the weight of the structure.
The same requirement to reduce costs exists for offshore platforms constructed for defence, communications and observation purposes.
The present invention relates to the use of. flexible mudmats, made from cable nets and geotextile membrane cover, to provide both temporary and permenant foundations for offshore structures which are lighter in weight than the conventional rigid mudmats and therefore reduce sea transport and installation costs.
Thus, according to the present invention there is provided a flexible foundation for offshore structures consisting of a net made from cable net with a geotextile membrane covering which is stitched or bonded to the cables and connected to the bottom of the structure. A soil retaining structure made from the same cable and membrane system surrounds such mudmats and is fixed to the legs of the structure by means of padeyes and shackles.
Means of connecting together the cables to form the net and the membrane cover are provided.
The invention will now be described by way of example only and with reference to Figures 1 to 4 of the accompanying drawings which show, on elevation, general view of the mudmat and details of the connections.
Figure 1 shows the flexible mudmat in its final service configuration.
Figures 2(a), 2(b), 2(c) shows the components of the cubical nodal connection.
Figure 3 shows the arrangement of the cylindrical connection.
Figure 4 shows the arrangement of the soil retaining structures.
While the shape of the flexible mudmat shown is triangular, other shapes (e.g. square, circular etc.) are possible according to the structure requirements and other net configurations are also possible.
The flexible mudmat can be connected to the structure using conventional padeyes and shackles.
The flexible mudmat can be used for both permanent and temporary support on any soil for offshore structures.

Claims (8)

1. An offshore structure foundation support consisting of cables nets and membrane cover.
2. An offshore structure foundation provided with a retaining structure consisting of an arrangement of cable nets and membrane cover to prevent soil collapse and enhancing lateral stability.
3. An offshore structure foundation provided with a combination of claims 1 and 2 and with a varied configuration.
4. An offshore structure foundation consisting of claims 1 to 3, of which the foundation unit incorporates penetrating skirts or piles to assist the maintenance of stability in service conditions.
5. An offshore structure foundation consisting of claims 1 to 4 and connected to the structure by other means.
6. An offshore structure foundation consisting of claims 1 to 5 in which the superstructure is for offshore mineral extraction purposes, habitation, communication, control or observation purposes.
7. An offshore structure foundation support and/or retaining structure as hereinbefore described with reference to the accompanying drawings.
8. An array of offshore structure foundation and/or retaining structure according to any of claims 1 to 7.
GB9204498A 1992-03-02 1992-03-02 Flexible mudmats for offshore structures Withdrawn GB2267107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9204498A GB2267107A (en) 1992-03-02 1992-03-02 Flexible mudmats for offshore structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9204498A GB2267107A (en) 1992-03-02 1992-03-02 Flexible mudmats for offshore structures

Publications (2)

Publication Number Publication Date
GB9204498D0 GB9204498D0 (en) 1992-04-15
GB2267107A true GB2267107A (en) 1993-11-24

Family

ID=10711358

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9204498A Withdrawn GB2267107A (en) 1992-03-02 1992-03-02 Flexible mudmats for offshore structures

Country Status (1)

Country Link
GB (1) GB2267107A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1056909A2 (en) * 1998-02-20 2000-12-06 Stuck in the Mud Limited Partnership Mudmats for offshore platform support
US20100119382A1 (en) * 2008-11-10 2010-05-13 Schlumberger Technology Corporation Subsea pumping system with interchangable pumping units
WO2011070191A3 (en) * 2009-12-11 2011-08-04 Grupo De Ingeniería Oceánica, S.L. System for the floating and immersion control of platforms supported on the sea bed
US8083501B2 (en) * 2008-11-10 2011-12-27 Schlumberger Technology Corporation Subsea pumping system including a skid with wet matable electrical and hydraulic connections
US20130195684A1 (en) * 2008-11-10 2013-08-01 Schlumberger Technology Corporation Subsea pumping system
EP2767637A1 (en) 2013-02-14 2014-08-20 BEKA MareSOLUTIONs GmbH Device made from a flat flexible material held by a support structure for scour protection and method for producing a support structure
DE202013012108U1 (en) 2013-02-14 2015-04-22 Beka Maresolutions Gmbh Device comprising a flat flexible material for the scouring protection held by a support structure
US9909689B2 (en) 2013-03-04 2018-03-06 Subsea 7 Limited Pipelaying

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030306A (en) * 1975-08-14 1977-06-21 Ole Fjord Larsen Apparatus for preventing erosion of the seabed in front of hydraulic structures
EP0197000A1 (en) * 1985-03-05 1986-10-08 Fritz Landolt Aktiengesellschaft Element for realizing steep plant-accommodating slopes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030306A (en) * 1975-08-14 1977-06-21 Ole Fjord Larsen Apparatus for preventing erosion of the seabed in front of hydraulic structures
EP0197000A1 (en) * 1985-03-05 1986-10-08 Fritz Landolt Aktiengesellschaft Element for realizing steep plant-accommodating slopes

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1056909A4 (en) * 1998-02-20 2002-07-24 Stuck In The Mud Ltd Partnersh Mudmats for offshore platform support
EP1056909A2 (en) * 1998-02-20 2000-12-06 Stuck in the Mud Limited Partnership Mudmats for offshore platform support
US8899941B2 (en) * 2008-11-10 2014-12-02 Schlumberger Technology Corporation Subsea pumping system
US20100119382A1 (en) * 2008-11-10 2010-05-13 Schlumberger Technology Corporation Subsea pumping system with interchangable pumping units
US8083501B2 (en) * 2008-11-10 2011-12-27 Schlumberger Technology Corporation Subsea pumping system including a skid with wet matable electrical and hydraulic connections
US9091258B2 (en) * 2008-11-10 2015-07-28 Schlumberger Technology Corporation Subsea pumping system with interchangeable pumping units
US20130019969A1 (en) * 2008-11-10 2013-01-24 Schlumberger Technology Corporation Subsea Pumping System With Interchangeable Pumping Units
US20130195684A1 (en) * 2008-11-10 2013-08-01 Schlumberger Technology Corporation Subsea pumping system
US8500419B2 (en) * 2008-11-10 2013-08-06 Schlumberger Technology Corporation Subsea pumping system with interchangable pumping units
WO2011070191A3 (en) * 2009-12-11 2011-08-04 Grupo De Ingeniería Oceánica, S.L. System for the floating and immersion control of platforms supported on the sea bed
ES2386268A1 (en) * 2009-12-11 2012-08-14 Grupo De Ingeniería Oceánica, S.L. Redundant system providing sealing, buoyancy and immersion control for floating equipment
EP2767637A1 (en) 2013-02-14 2014-08-20 BEKA MareSOLUTIONs GmbH Device made from a flat flexible material held by a support structure for scour protection and method for producing a support structure
DE202013012108U1 (en) 2013-02-14 2015-04-22 Beka Maresolutions Gmbh Device comprising a flat flexible material for the scouring protection held by a support structure
US9909689B2 (en) 2013-03-04 2018-03-06 Subsea 7 Limited Pipelaying
US10544880B2 (en) 2013-03-04 2020-01-28 Subsea 7 Limited Pipelaying

Also Published As

Publication number Publication date
GB9204498D0 (en) 1992-04-15

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)