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WO1999057011A1 - Engin de forage semi-submersible a positionnement dynamique - Google Patents

Engin de forage semi-submersible a positionnement dynamique Download PDF

Info

Publication number
WO1999057011A1
WO1999057011A1 PCT/US1999/009325 US9909325W WO9957011A1 WO 1999057011 A1 WO1999057011 A1 WO 1999057011A1 US 9909325 W US9909325 W US 9909325W WO 9957011 A1 WO9957011 A1 WO 9957011A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
pontoons
braces
thruster
pontoon
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.)
Ceased
Application number
PCT/US1999/009325
Other languages
English (en)
Inventor
Eugene E. Begnaud
Calvin V. Norton
Bruce G. Malcolm
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.)
Friede and Goldman Ltd
Original Assignee
Friede and Goldman 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 Friede and Goldman Ltd filed Critical Friede and Goldman Ltd
Priority to AU38720/99A priority Critical patent/AU3872099A/en
Publication of WO1999057011A1 publication Critical patent/WO1999057011A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices

Definitions

  • the invention relates to an offshore drilling unit, and more particularly to a semi-submersible vessel for conducting offshore operations in moderate or severe environments, such as the Gulf of Mexico, the North Sea, offshore
  • braces are used between the columns, the braces contributing to the water plane area of the vessel.
  • the braces are usually constructed with smaller diameters than that of the columns and are therefore more vulnerable to the environmental and mechanical damage. If the connecting braces are damaged, the entire structure becomes jeopardized.
  • the vessel comprises a pair of parallel buoyant pontoons having a generally rectangular configuration and divided into a plurality of independent compartments.
  • Four column, or caissons are mounted on the pontoons and extend vertically to support the upper deck of an offshore platform suitable for conducting mineral exploration or production operations.
  • the vessel is moored at a location using dynamically positioned thruster assemblies mounted on the pontoons.
  • the thruster unit extends below the pontoon, while a motor which independently drives a respective thruster unit, is mounted inside a thruster room within the pontoon.
  • a passageway between the thruster rooms in the pontoons allows access to the thruster assemblies, with the passageway communicating with the platform at a level above an operating draft of the vessel.
  • a pair of horizontal braces are secured between opposing pairs of columns, the braces extending generally perpendicularly to longitudinal axes of the elongated pontoons.
  • the braces are provided with "redundancy" features - they contain two independent watertight compartments.
  • a bulkhead divides an oblong brace into two independent sections, so as to retain stability of the vessel even if the structural integrity of a compartment wall is compromised by wave motions or physical objects striking the brace. In that manner, even if one section of the wall is damaged, the second independent buoyant compartment will help to retain structural capability at severe environmental occurrences.
  • the columns and hulls of the pontoons are provided with outwardly convex, rounded corners.
  • the pontoon hulls have compartments for storing ballasts, drill water and other necessary supplies.
  • the columns, or caissons house reserve mud tanks, ballasts tanks, force air ventilation supply and other necessary machinery and equipment. It is an integrated box deck structure that houses drilling and ship service equipment, power generation, storage for liquid mud and other miscellaneous objects. Living quarters and service equipment is mounted on the platform, as well.
  • Figure 1 is a perspective view of the semi- submersible vessel in accordance with the present invention.
  • Figure 2 is an outboard profile illustration of the vessel in accordance with the present invention.
  • Figure 3 is a cross-sectional of the brace for use in the vessel of the present invention.
  • Figure 4 is an elevation of bow of the semi-submersible vessel of the present invention.
  • Figure 5 is an elevational view of a stern of the vessel of the present invention.
  • Figure 6 is a longitudinal sectional view of starboard outboard portion of the vessel.
  • Figure 7 is an elevational view of columns forming part of the vessel of the present invention.
  • Figure 8 is a schematic view illustrating a general arrangement of a pontoon hull.
  • numeral 10 designates the semi-submersible vessel of the present invention.
  • the vessel comprises a pair of floating buoyant hulls, or pontoons 12, 14 divided into a plurality of watertight compartments for accommodating ballasts, as well as allowing access to thruster assemblies, as will be described in more detail hereinafter.
  • the upper portions of the columns 20, 22, 24, and 26 carry a platform 30 adapted for supporting mineral exploration and production operations.
  • parts of the columns 20-26, as well as pontoons 12 and 14 are submerged below the water surface to an operational draft 32, while the upper portions of the columns 20-26 and platform 30 are elevated to a level above maximum expected wave for a particular location.
  • the ballast chambers in the pontoons 12 and 14 provide the necessary room for introducing a ballast, for example, sea water to partially submerge the structure.
  • the operational draft 32 is generally higher than a survival draft 34
  • the horizontal braces 38 and 40 extend between columns 20, 24, and 22-26, as can be seen in Figures 1, 4 and 5.
  • the horizontal braces 38 and 40 connect the opposing pairs of columns at a vertical level above the pontoons 12 and 14 and below the survival draft 34 of the vessel 10.
  • each brace 38 and 40 is provided with a "redundancy" feature. As shown in Figure 3, each brace 38 and 40 has a generally oval, or oblong cross section and is provided with an internal bulk head 42 which divides the brace 38, or 40 into two equal longitudinal sections.
  • the bulk head 42 defines two independent compartments 44 and 46 in each of the slender braces 38 and 40. The compartments are watertight and if the wall of one of the compartments is damaged or penetrated, the second compartment will survive, continuing to connect the columns and contribute to the stability of the vessel 10 on the water.
  • the bow corners of the pontoons are formed with rounded vertical side walls 50, 52, 54 and 56 (Figure 1, bow portion).
  • Angular vertical side walls 51, 52, 54 and 56 Figure 1, bow portion.
  • each column, or caisson 20, 22, 24, and 26 has rounded corners 60 of a discrete radius.
  • This radius can be, for example 1/4 or greater of the depth or width of the generally square caisson.
  • the vessel 10 is provided with a full dynamically positioned system of station keeping.
  • the system consists of eight 360° fixed pitch variable speed azimuthing thruster assemblies secured to the bottom of the pontoon 12, and in a preferred embodiment, a pair of thruster assemblies is located at starboard and a pair at port side of each pontoon 12 and 14 (See Figure 8). It is believed that this system is sufficient for water depths up to 10,000 feet.
  • Mounted on the main deck 64 of the platform 30 are a pair of winches
  • the winches 66 are designed to hold a length of wire rope for harbor mooring. If desired, the number of winches can be increased up to eight, for an 8-point pre-set mooring configuration.
  • the motor means 68 can be AC drive, or other similar means.
  • a passageway 72 is formed in the hull body 12 and 14. The passageway 72 extends between thruster rooms 70, the passageway 72 communicating with platform 30 at a level above the operational draft 32.
  • the thruster rooms 68 can be accessed directly from the upper deck 64, or cranes can be used to get access to the thruster rooms 70.
  • the vessel 10 uses ballasted pontoons and caissons for operational stability.
  • the substructure loads are distributed through columns 20-26.
  • the caissons 20-26 carry a box-shaped buoyant attachments 74 secured at a general area of survival draft 34. By carefully selecting the position of the members 74, it is possible to maximize the survival conditions of the vessel. An additional benefit of the buoyant members 74 is that there is no reduction in load capability on the vessel between operating draft and survival draft.
  • the members 74 give variable load capability and water plane displacement.
  • the member 74 do not substantially affect water plane area at operational draft as their position is below the draft level 32. It is important that the members 74 do not extend past the flat portion of the caissons 20-26, but rather extend in vertical alignment with the outer wall of the lower hull pontoon. Since the outer limits of the attachments 74 do not pass the vertical line of the pontoon outer wall, ease of construction of the vessel 10 at dry dock is facilitated. The outer limits of the width of the outer walls of the members 74 terminate before the outwardly convex corners 60 of the columns 20-26 begin to curve.
  • the vessel 10 provides a facility for conducting mineral exploration in relatively deep waters of up to 10,000 feet.
  • the vessel 10 is equipped with a pair of cranes 80, 82 mounted on crane pedestals 84. Drilling and production operations are conducted through the platform 30 in a manner well known to those skilled in the art.
  • Riser sections 86 ( Figure 5) are stored on the main deck, and can be delivered to the drill floor 88 in an efficient, cost effective manner.
  • the compartments formed in the pontoon 12 and 14, in addition to holding salt water ballasts are equipped for housing pumps, storing drill water, diesel oil and other necessary materials.
  • the caissons 20-24 are also compartmentalized to hold reserve mud tanks, brine tanks, base oil tanks, ballast tanks, vents, ventilation supplies and return pipes for lower hull and column machinery compartments.
  • the upper hull, or platform 30 structure uses an integrated box deck structure to house drilling and ship service equipment, power generation and storage for liquid mud, sacks, and other variable materials and equipment.
  • Two gantry cranes are provided.
  • One of the gantry cranes 90 can be used to run a riser, while another gantry crane 92 can be provided over the blowout preventer for splitting the storage area stack. This storage area can also be used to run sub-sea trees.
  • the living quarters on the platform 10 can accommodate the necessary number of crew members for conducting the mineral exploration and production operations.
  • the rounded corners of the pontoons and columns require less effort to maintain position of the vessel at a selected location above the drilling area. As a result, less power is required, less fuel is used, and the mineral exploration and production operations run more efficiently.
  • the vessel 10 uses no anchors for remaining in place but rather a dynamically positioned system utilizing azimuthing thrusters for increased efficiency of the vessel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Revetment (AREA)

Abstract

L'invention concerne une structure offshore (10) et plus particulièrement un engin semi-submersible destiné à fonctionner dans un environnement hostile, par exemple, dans la Mer du Nord, vers Terre-Neuve ou dans des endroits similaires. L'engin possède une structure à pontons (12, 14) avec deux coques, qui soutient quatre caissons d'angle (20, 22, 24, 26) s'étendant verticalement depuis les pontons au-dessus de la ligne de charge opérationnelle de l'engin. Une paire d'entretoises horizontales (38, 40) relient entre elles les paires de caissons opposées, les entretoises étant disposées dans un plan généralement perpendiculaire aux axes longitudinaux des pontons. Chaque entretoise possède un élément redondant qui est divisé en deux compartiments étanches indépendants. Si une paroi de compartiment venait à être endommagée, l'autre moitié permet de garder la stabilité opérationnelle de l'engin, au moins avec un tirant d'eau de survie. Le maintien de la station est assuré au moyen d'un système de positionnement entièrement dynamique, constitué de plusieurs ensembles de propulsion montés à bâbord et à tribord de la coque du ponton. Chaque ponton (12, 14) comporte un passage permettant l'accès aux ensembles de propulsion à des fins d'installation et, si nécessaire, de réparation.
PCT/US1999/009325 1998-05-01 1999-04-29 Engin de forage semi-submersible a positionnement dynamique Ceased WO1999057011A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38720/99A AU3872099A (en) 1998-05-01 1999-04-29 Dynamically positioned semi-submersible drilling vessel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7152898A 1998-05-01 1998-05-01
US09/071,528 1998-05-01

Publications (1)

Publication Number Publication Date
WO1999057011A1 true WO1999057011A1 (fr) 1999-11-11

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Country Status (2)

Country Link
AU (1) AU3872099A (fr)
WO (1) WO1999057011A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001056872A1 (fr) * 2000-02-02 2001-08-09 Friede & Goldman, Ltd. Batiment de forage semi-submersible a positionnement dynamique pourvu de contreventements horizontaux minces
WO2002004286A1 (fr) * 2000-07-10 2002-01-17 Open Joint-Stock Company Central Design Bureau 'corall' Procede pour reparer une plate-forme de forage flottante semi-immergee
EP1390585A4 (fr) * 2001-05-01 2007-08-29 Drillmar Inc Plate-forme a usages multiples avec tour a usages multiples et procede d'amarrage a une plate-forme semi-submersible
WO2011029642A1 (fr) 2009-09-14 2011-03-17 Eide Marine Services As Barge de déploiement et de récupération d'équipements en mer
CN101769225B (zh) * 2008-12-30 2012-05-30 中国海洋大学 升降式双浮体潮流发电平台
CN104310162A (zh) * 2014-08-04 2015-01-28 洛阳市四洲水能发电科技有限公司 水电站升降设备
WO2016124011A1 (fr) * 2015-02-02 2016-08-11 中集海洋工程研究院有限公司 Plate-forme de forage de type semi-submersible dans l'eau de profondeur moyenne
CN106143817A (zh) * 2015-02-02 2016-11-23 中集海洋工程研究院有限公司 半潜平台及其下浮体
CN106945794A (zh) * 2017-02-16 2017-07-14 中国石油大学(华东) 一种抑制半潜式平台垂荡响应的方法
CN109835442A (zh) * 2017-11-24 2019-06-04 烟台中集来福士海洋工程有限公司 超深水半潜式钻井平台
CN110844012A (zh) * 2019-11-15 2020-02-28 中国电建集团华东勘测设计研究院有限公司 一种深吃水半潜式海上换流站
CN111232141A (zh) * 2020-01-14 2020-06-05 西安石油大学 一种具备可活动压载舱的海上浮体

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490406A (en) * 1968-08-23 1970-01-20 Offshore Co Stabilized column platform
US3915108A (en) * 1973-09-24 1975-10-28 Global Marine Inc Apparatus for controlling heave pitch and roll of a floating vessel
US3919957A (en) * 1974-04-15 1975-11-18 Offshore Co Floating structure and method of recovering anchors therefor
FR2408512A1 (fr) * 1977-11-10 1979-06-08 Dziewolski Richard Plate-forme flottante semi-submersible
GB2121733A (en) * 1982-06-08 1984-01-04 Goetaverken Arendal Ab An offshore platform
GB2132142A (en) * 1982-12-07 1984-07-04 Goetaverken Arendal Ab An offshore vessel
GB2148203A (en) * 1983-10-25 1985-05-30 Central Oil & Gas Ltd Semi-submersible marine platform
GB2159468A (en) * 1984-06-01 1985-12-04 Goetaverken Arendal Ab An offshore vessel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490406A (en) * 1968-08-23 1970-01-20 Offshore Co Stabilized column platform
US3915108A (en) * 1973-09-24 1975-10-28 Global Marine Inc Apparatus for controlling heave pitch and roll of a floating vessel
US3919957A (en) * 1974-04-15 1975-11-18 Offshore Co Floating structure and method of recovering anchors therefor
FR2408512A1 (fr) * 1977-11-10 1979-06-08 Dziewolski Richard Plate-forme flottante semi-submersible
GB2121733A (en) * 1982-06-08 1984-01-04 Goetaverken Arendal Ab An offshore platform
GB2132142A (en) * 1982-12-07 1984-07-04 Goetaverken Arendal Ab An offshore vessel
GB2148203A (en) * 1983-10-25 1985-05-30 Central Oil & Gas Ltd Semi-submersible marine platform
GB2159468A (en) * 1984-06-01 1985-12-04 Goetaverken Arendal Ab An offshore vessel

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001056872A1 (fr) * 2000-02-02 2001-08-09 Friede & Goldman, Ltd. Batiment de forage semi-submersible a positionnement dynamique pourvu de contreventements horizontaux minces
WO2002004286A1 (fr) * 2000-07-10 2002-01-17 Open Joint-Stock Company Central Design Bureau 'corall' Procede pour reparer une plate-forme de forage flottante semi-immergee
RU2224680C1 (ru) * 2000-07-10 2004-02-27 Открытое акционерное общество "Центральное конструкторское бюро "Коралл" Способ ремонта плавучей полупогружной буровой платформы
EP1390585A4 (fr) * 2001-05-01 2007-08-29 Drillmar Inc Plate-forme a usages multiples avec tour a usages multiples et procede d'amarrage a une plate-forme semi-submersible
CN101769225B (zh) * 2008-12-30 2012-05-30 中国海洋大学 升降式双浮体潮流发电平台
WO2011029642A1 (fr) 2009-09-14 2011-03-17 Eide Marine Services As Barge de déploiement et de récupération d'équipements en mer
US8689720B2 (en) 2009-09-14 2014-04-08 Eide Marine Services As Offshore equipment deploying and retrieving vessel
CN104310162A (zh) * 2014-08-04 2015-01-28 洛阳市四洲水能发电科技有限公司 水电站升降设备
WO2016124011A1 (fr) * 2015-02-02 2016-08-11 中集海洋工程研究院有限公司 Plate-forme de forage de type semi-submersible dans l'eau de profondeur moyenne
CN106143817A (zh) * 2015-02-02 2016-11-23 中集海洋工程研究院有限公司 半潜平台及其下浮体
CN106143818A (zh) * 2015-02-02 2016-11-23 中集海洋工程研究院有限公司 中深水半潜式钻井平台
CN106143818B (zh) * 2015-02-02 2018-09-11 中集海洋工程研究院有限公司 中深水半潜式钻井平台
CN106945794A (zh) * 2017-02-16 2017-07-14 中国石油大学(华东) 一种抑制半潜式平台垂荡响应的方法
CN109835442A (zh) * 2017-11-24 2019-06-04 烟台中集来福士海洋工程有限公司 超深水半潜式钻井平台
CN110844012A (zh) * 2019-11-15 2020-02-28 中国电建集团华东勘测设计研究院有限公司 一种深吃水半潜式海上换流站
CN111232141A (zh) * 2020-01-14 2020-06-05 西安石油大学 一种具备可活动压载舱的海上浮体

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