EP2527242A1 - Installation method of an offshore upended float-over platform - Google Patents

Installation method of an offshore upended float-over platform Download PDF

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Publication number
EP2527242A1
EP2527242A1 EP11004292A EP11004292A EP2527242A1 EP 2527242 A1 EP2527242 A1 EP 2527242A1 EP 11004292 A EP11004292 A EP 11004292A EP 11004292 A EP11004292 A EP 11004292A EP 2527242 A1 EP2527242 A1 EP 2527242A1
Authority
EP
European Patent Office
Prior art keywords
offshore
floater
float
upended
columns
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Withdrawn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
EP11004292A
Other languages
German (de)
French (fr)
Inventor
Cees Eugen Jochem Leenaars
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.)
Leenars Cees Eugen Jochem
Original Assignee
Leenars Cees Eugen Jochem
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 Leenars Cees Eugen Jochem filed Critical Leenars Cees Eugen Jochem
Priority to EP11004292A priority Critical patent/EP2527242A1/en
Publication of EP2527242A1 publication Critical patent/EP2527242A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B77/00—Transporting or installing offshore structures on site using buoyancy forces, e.g. using semi-submersible barges, ballasting the structure or transporting of oil-and-gas platforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B2021/505—Methods for installation or mooring of floating offshore platforms on site

Definitions

  • the purpose of this invention is to create an offshore base with good motion response in high waves and strong winds. Which can be installed at an offshore location in 2 to 3 meters significant wave height by float over in between the legs. This way the down time risk for the installation will be acceptable for all offshore oil fields.
  • the invention relates to an offshore base with a floating support structure, consisting of multiple slender legs, on which a platform can be placed.
  • the vertical legs called columns, carry the platform by buoyancy.
  • the long columns produce very acceptable motions of the platform even in strong winds and high waves.
  • the support structure or floater, can be divided into two or more parts, which can be transported horizontally, so that mobilization is easy. It can be placed in vertical position at the offshore site by consecutive flooding of ballast tanks. This is called upending.
  • the deck preferably with fully completed facilities, is floated over between the columns that are so wide apart that a barge or deck fits in between the vertical columns, limiting the work offshore to an absolute minimum.
  • Dedicated tanks are available in the columns that can be emptied in a matter of seconds by compressed air to prevent hammering during the initial contact phase and the lift off phase.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

The invention relates to a method for transporting and installing a floating offshore base (1) consisting of a multi-columned floater (2) supporting a platform (3) above water. The floater (2) is transported horizontally to the site and upended. The platform (3) is transported to the site on a barge or any other vessel and installed onto the floater (2) by means of a float-over operation in between the columns (4) of the floater.

Description

    Background of the invention
  • There is an increasing demand for oil and gas production from offshore deep water sites. These sites encounter high winds and waves, which can result in unacceptable heaving, pitching and rolling of the offshore structure, for the production of oil in deep waters. Besides this, with the installation of an offshore platform difficulty arises with the installation of the deck. Float-over (floating the deck over a support structure) has not been possible offshore in wave heights of 1m and higher due to the large forces created by the relative motions between deck and support structure. Present spar designs with one or multi-column are difficult to transport and float-over is based on floating around the support structure.
  • The purpose of this invention is to create an offshore base with good motion response in high waves and strong winds. Which can be installed at an offshore location in 2 to 3 meters significant wave height by float over in between the legs. This way the down time risk for the installation will be acceptable for all offshore oil fields.
    • Description of the invention
  • The invention relates to an offshore base with a floating support structure, consisting of multiple slender legs, on which a platform can be placed. The vertical legs, called columns, carry the platform by buoyancy. The long columns produce very acceptable motions of the platform even in strong winds and high waves.
  • The support structure, or floater, can be divided into two or more parts, which can be transported horizontally, so that mobilization is easy. It can be placed in vertical position at the offshore site by consecutive flooding of ballast tanks. This is called upending.
  • The deck, preferably with fully completed facilities, is floated over between the columns that are so wide apart that a barge or deck fits in between the vertical columns, limiting the work offshore to an absolute minimum.
  • Dedicated tanks are available in the columns that can be emptied in a matter of seconds by compressed air to prevent hammering during the initial contact phase and the lift off phase.
    • Description of the drawings
    • Figure 1 shows a perspective view of an offshore base (1), which consist of a floater (2) and topside (3). The floater (2) consists of two or more columns (4). The columns (4) are positioned such that a vessel or barge can be floated in between the columns (4) to install the topside (3). The columns (4) are connected by horizontal members (5), called bracings.
    • Figure 2 shows a four -columned configuration.
    • Figure 3 shows a float-over operation by means of a vessel (6). Once the floater (2) is upended, the topside (3) is floated in between the columns (4) on a vessel (6).

Claims (3)

  1. A floating offshore structure that consist of multiple columns whereby the floater is upended offshore and the topside is installed with a float-over operation in between the columns.
  2. A platform according to claim 1 whereby the floater is transported in a horizontal manner and upended by ballasting.
  3. A platform according to claim 1 whereby the topside is positioned and lowered onto the floater by means of any type of vessel.
EP11004292A 2011-05-25 2011-05-25 Installation method of an offshore upended float-over platform Withdrawn EP2527242A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11004292A EP2527242A1 (en) 2011-05-25 2011-05-25 Installation method of an offshore upended float-over platform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11004292A EP2527242A1 (en) 2011-05-25 2011-05-25 Installation method of an offshore upended float-over platform

Publications (1)

Publication Number Publication Date
EP2527242A1 true EP2527242A1 (en) 2012-11-28

Family

ID=44653944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11004292A Withdrawn EP2527242A1 (en) 2011-05-25 2011-05-25 Installation method of an offshore upended float-over platform

Country Status (1)

Country Link
EP (1) EP2527242A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106379488A (en) * 2016-09-19 2017-02-08 中国海洋石油总公司 Method for quickly carrying out floating installation of platform at sea

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2328408A (en) * 1997-08-22 1999-02-24 Kvaerner Oil & Gas Australia P Buoyant substructure for offshore platform
WO2004096632A1 (en) * 2003-05-01 2004-11-11 Leenaars B.V. A floating construction, a platform construction, a method for placing a floating platform construction at sea, and a method for removing a platform construction at sea
US20040253060A1 (en) * 2003-06-11 2004-12-16 Horton Edward E. Semi-submersible multicolumn floating offshore platform
US20080056829A1 (en) * 2006-09-05 2008-03-06 Horton Edward E Method for making a floating offshore drilling/producing structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2328408A (en) * 1997-08-22 1999-02-24 Kvaerner Oil & Gas Australia P Buoyant substructure for offshore platform
WO2004096632A1 (en) * 2003-05-01 2004-11-11 Leenaars B.V. A floating construction, a platform construction, a method for placing a floating platform construction at sea, and a method for removing a platform construction at sea
US20040253060A1 (en) * 2003-06-11 2004-12-16 Horton Edward E. Semi-submersible multicolumn floating offshore platform
US20080056829A1 (en) * 2006-09-05 2008-03-06 Horton Edward E Method for making a floating offshore drilling/producing structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106379488A (en) * 2016-09-19 2017-02-08 中国海洋石油总公司 Method for quickly carrying out floating installation of platform at sea
CN106379488B (en) * 2016-09-19 2018-01-16 中国海洋石油总公司 The method for quickly carrying out marine floating support mounting platform

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