GB2292167A - Self-installing shallow water platform for hydrocarbon production - Google Patents

Self-installing shallow water platform for hydrocarbon production Download PDF

Info

Publication number
GB2292167A
GB2292167A GB9416407A GB9416407A GB2292167A GB 2292167 A GB2292167 A GB 2292167A GB 9416407 A GB9416407 A GB 9416407A GB 9416407 A GB9416407 A GB 9416407A GB 2292167 A GB2292167 A GB 2292167A
Authority
GB
United Kingdom
Prior art keywords
platform
base
offshore
offshore oil
deck structure
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.)
Granted
Application number
GB9416407A
Other versions
GB9416407D0 (en
GB2292167B (en
Inventor
David Bone
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.)
BROOKMEX Ltd
Original Assignee
BROOKMEX Ltd
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 BROOKMEX Ltd filed Critical BROOKMEX Ltd
Priority to GB9416407A priority Critical patent/GB2292167B/en
Publication of GB9416407D0 publication Critical patent/GB9416407D0/en
Publication of GB2292167A publication Critical patent/GB2292167A/en
Application granted granted Critical
Publication of GB2292167B publication Critical patent/GB2292167B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • E02B17/021—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 with relative movement between supporting construction and platform
    • 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
    • E02B17/027—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 steel structures
    • 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
    • E02B2017/0039—Methods for placing the offshore structure
    • E02B2017/0047—Methods for placing the offshore structure using a barge
    • 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
    • E02B2017/0056—Platforms with supporting legs
    • 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
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0073—Details of sea bottom engaging footing
    • E02B2017/0086—Large footings connecting several legs or serving as a reservoir for the storage of oil or gas

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Foundations (AREA)

Abstract

An offshore oil or gas production platform comprises a plurality of vertical steel columns extending upwardly from a gravity base and supporting a steel lattice deck structure thereon. The deck structure is free to move up or down the column and can be secured at any desired level by means of clamps. The gravity base is fitted with a system of pipes which can be used to ballast or deballast it. When installing the platform (Fig 3, not shown) a barge inserted between the gravity base and deck structure tows the combined assembly to the site. The base is then submerged by ballasting, the platform is locked to the column legs by clamps and the barge is removed; the final level of the platform is adjusted by jacking from the clamps. <IMAGE>

Description

SELF-INSTALLING SHALLOW WATER PLATFORM FOR OFFSHORE HYDROCARBON PRODUCTION This invention relates to a low-cost shallow water offshore production facility.
Offshore production facilities for shallow water generally comprise a braced steel tower structure supporting a platform some distance above mean sea level. Foundation support is generally provided by long steel piles driven into the seabed either through the primary structural members or through steel sleeves or guides rigidly attached to these members. The structure is generally installed using heavy-lift offshore cranes. These facilities are expensive both because of the complex steel structure involved and because of the expensive vessels required for offshore installation.
According to the present invention there is provided an offshore production platform which is greatly simplified in construction and which requires no unusual or expensive vessels or equipment to install.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows in vertical cross-section the self-installing shallow water platform on location in a typical water depth of 30 metres.
Figure 2 shows processing and extraction equipment that might typically be located on the upper decks.
Figure 3 shows the method of installation of the platform.
Referring to the drawings the facility comprises a reinforced concrete hollow cellular base structure, 1, with four steel columns, 2, supporting a steel lattice deck structure, 3. The base structure could equally well be steel or ferrocement or other suitable material. The steel lattice deck structure is free to move up or down the steel columns.
The steel lattice deck can be secured to the columns at any desired level by means of steel 'bear-type' hoop clamps, 4, which form part of the structure being welded to the lattice chords. The base structure is designed with a large bearing area to impose a low seabed vertical loading. The base is designed as a gravity base and for most seabed conditions requires no piling or grouting to ensure adequate support.
The gravity base is fitted with a system of pipes which can be used to ballast or deballast it. The waterplane area and draft of the base is sufficient to allow it to support in water it's own weight together with the weight of the deck structure, operational and installation equipment, the tubular column legs and the barge which is used during installation.
The structure thus uses the buoyancy of the base structure during both the tow to site and subsequent installation. This buoyancy is also used when the platform is removed.
Prior to towage a barge is inserted between the concrete gravity base and the deck structure. The combined assembly is locked for sea transport and towed to site. Once on site the locks are released and the base is gradually submerged by filling it with sea water ballast. This leaves the deck structure supported by the barge which has itself hitherto been supported by the buoyancy of the base.
Once the base has been sufficiently ballasted to cause it to submerge to the seabed the platform is locked to the column legs using purpose designed installation clamps which depend on friction for their support. The barge is removed and the final level of the platform is adjusted by jacking from the installation clamps.
The permanent clamps are then engaged and the platform is thus secured for operation. Connections to control lines, pipelines etc. can then be made and the system commissioned for use.

Claims (7)

1. An offshore production platform which is greatly simplified in construction and which requires no unusual or expensive vessels or equipment to install.
2. A low cost offshore oil or gas production platform, as claimed in Claim 1, which depends on the transfer of moment between the support columns and deck structure and between the support columns and base to obviate bracing.
3. An offshore oil or gas production facility, as claimed in Claim 1 or Claim 2, which does not require specialised and expensive floating lifting vessels for installation.
4. An offshore oil or gas production platform, as claimed in Claim 2 or Claim 3, which uses it's own base structure to provide buoyancy for sea transport and installation.
5. An offshore oil or gas platform, as claimed in Claim 4, where the deck structure is secured to the support columns by means of friction developed by bolted clamps.
6. An offshore oil or gas platform, as claimed in Claim 5, where the ability to deballast it's own base can be used to assist it's removal.
7. An offshore platform substantially as described herein, with reference to Figures 1-3 of the accompanying drawings.
GB9416407A 1994-08-13 1994-08-13 Self-installing shallow water platforms for offshore hydrocarbon production Expired - Fee Related GB2292167B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9416407A GB2292167B (en) 1994-08-13 1994-08-13 Self-installing shallow water platforms for offshore hydrocarbon production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9416407A GB2292167B (en) 1994-08-13 1994-08-13 Self-installing shallow water platforms for offshore hydrocarbon production

Publications (3)

Publication Number Publication Date
GB9416407D0 GB9416407D0 (en) 1994-10-05
GB2292167A true GB2292167A (en) 1996-02-14
GB2292167B GB2292167B (en) 1998-05-06

Family

ID=10759849

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9416407A Expired - Fee Related GB2292167B (en) 1994-08-13 1994-08-13 Self-installing shallow water platforms for offshore hydrocarbon production

Country Status (1)

Country Link
GB (1) GB2292167B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2323620A (en) * 1996-12-30 1998-09-30 Marine Structure Consul Jack-up platform with storage tank and method for installing such a jack-up platform
GB2335221A (en) * 1997-12-11 1999-09-15 Kvaerner Oil & Gas Ltd Method of forming a substructure for an offshore platform
EP1068403A1 (en) 1998-04-02 2001-01-17 Suction Pile Technology B.V. Marine structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6481932B1 (en) 1999-11-18 2002-11-19 Suction Pile Technology B.V. Marine structure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717001A (en) * 1971-12-27 1973-02-20 Chicago Bridge & Iron Co Offshore storage structure
GB1517217A (en) * 1974-09-02 1978-07-12 Mannesmann Roehren Werke Ag Buoyant infinitely adjustable working rig
GB1540928A (en) * 1975-10-25 1979-02-21 Krupp Gmbh Offshore platform
GB1551859A (en) * 1975-11-03 1979-09-05 Strabag Bau Ag Platform for marine work
GB1585365A (en) * 1977-05-19 1981-03-04 Brown & Ass Inc J Rig transport
EP0039590A2 (en) * 1980-05-02 1981-11-11 Global Marine Inc. Offshore platform and method of constructing, erecting and dismantling same
GB2186901A (en) * 1986-02-24 1987-08-26 British Gas Plc Marine structure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717001A (en) * 1971-12-27 1973-02-20 Chicago Bridge & Iron Co Offshore storage structure
GB1517217A (en) * 1974-09-02 1978-07-12 Mannesmann Roehren Werke Ag Buoyant infinitely adjustable working rig
GB1540928A (en) * 1975-10-25 1979-02-21 Krupp Gmbh Offshore platform
GB1551859A (en) * 1975-11-03 1979-09-05 Strabag Bau Ag Platform for marine work
GB1585365A (en) * 1977-05-19 1981-03-04 Brown & Ass Inc J Rig transport
EP0039590A2 (en) * 1980-05-02 1981-11-11 Global Marine Inc. Offshore platform and method of constructing, erecting and dismantling same
GB2186901A (en) * 1986-02-24 1987-08-26 British Gas Plc Marine structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2323620A (en) * 1996-12-30 1998-09-30 Marine Structure Consul Jack-up platform with storage tank and method for installing such a jack-up platform
GB2323620B (en) * 1996-12-30 2001-04-18 Marine Structure Consul Jack-up platform with storage tank and method for installing such a jack-up platform
GB2335221A (en) * 1997-12-11 1999-09-15 Kvaerner Oil & Gas Ltd Method of forming a substructure for an offshore platform
GB2335221B (en) * 1997-12-11 2001-12-19 Kvaerner Oil & Gas Ltd Method of forming a substructure
EP1068403A1 (en) 1998-04-02 2001-01-17 Suction Pile Technology B.V. Marine structure

Also Published As

Publication number Publication date
GB9416407D0 (en) 1994-10-05
GB2292167B (en) 1998-05-06

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20131230 AND 20131231

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130813