WO2002087964A1 - Systeme de stockage pour petrole et condensat - Google Patents

Systeme de stockage pour petrole et condensat Download PDF

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Publication number
WO2002087964A1
WO2002087964A1 PCT/NO2002/000140 NO0200140W WO02087964A1 WO 2002087964 A1 WO2002087964 A1 WO 2002087964A1 NO 0200140 W NO0200140 W NO 0200140W WO 02087964 A1 WO02087964 A1 WO 02087964A1
Authority
WO
WIPO (PCT)
Prior art keywords
storage
oil
compartment
storage system
tank
Prior art date
Application number
PCT/NO2002/000140
Other languages
English (en)
Inventor
Arnstein Godejord
Trond LANDBÖ
Kåre O. HÆREID
Original Assignee
Dr. Techn. Olav Olsen As
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 Dr. Techn. Olav Olsen As filed Critical Dr. Techn. Olav Olsen As
Priority to BR0208841-0A priority Critical patent/BR0208841A/pt
Priority to CA2443723A priority patent/CA2443723C/fr
Publication of WO2002087964A1 publication Critical patent/WO2002087964A1/fr
Priority to NO20034591A priority patent/NO326102B1/no

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
    • 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
    • E02B17/025—Reinforced concrete 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
    • E02B2017/0043—Placing the offshore structure on a pre-installed foundation structure
    • 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
    • E02B2017/0065—Monopile 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
    • E02B2017/0056—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

Definitions

  • the present application concerns a storage system for oil and condensate preferably for use in a floating or fixed platform structure, where the storage system consists of at least one storage tank provided with a filling/offloading system at the top and a pipe system communicating to the sea or a separate water tank at the bottom.
  • NO 165 972 describes an oil storage system which is based on separation of oil and water in one or more storage tanks which are connected to a cleaning tank (water cell). Each storage tank is connected to a cleaning tank.
  • the storage system is intended for use in permanent installations which are founded on the seabed.
  • One of the objectives of the invention is to reduce the need for permanently installed, movable units.
  • US 4 685409 describes a storage system which is used on a floating platform.
  • the principle is that walls (bulkheads) are used in the construction to connect the top of a compartment with the bottom of another compartment. Thereby a total volume is obtained which consists of a number of compartments connected with each other in series.
  • One end compartment is connected to sea in the bottom.
  • the other end compartment is connected to a pipe for filling/offloading of hydrocarbons in the top.
  • the storage system solution has, however, limitations and weaknesses which result in loss of storage volume, mixing of oil/water over big areas which reduce the separation effect and increase the risk of pollution into sea, and will also influence the stability of the storage facility.
  • An alternative system is used for storage facilities immersed in water (sea), where oil/condensate and water are stored together in the same tank (wet oil storage), and the difference in specific weight causes separation and the oil/condensate is floating on the top of a water cushion.
  • This system can be used in floating platforms with storage facilities and will require less use of ballast to maintain constant draught, because only the difference in spe- cific weight between oil/condensate and water (about 0.15 - 0.3 t/m 3 ) has to be compensated for.
  • the platform in this case also can be left with a varying draught, which will vary less than by use of the first mentioned system.
  • a wet storage will reduce the difference between minimum and maximum weight and ballast can be saved because the storage facilities are never empty.
  • An objective of the present invention is to provide a storage tank wherein the mentioned effective (net) volume of the oil storage is optimised with regard to the gross volume of the storage. This means that the area of the mixed layer of oil/condensate is as small as possible.
  • Another objective of the present invention is that the storage facilities have good hydrodynamic properties and is stable in the sea.
  • the storage tank according to the present invention shall be flexible with regard to the constructive design of the storage system, e.g. with regard to mechanical equipment such as pumps, pipes, etc.
  • a storage system for oil and condensate primarily for use in a floating or fixed platform construction, which is characterised in that the storage tank is separated into a chosen number of compartments which are in liquid communication with each other through at least one pipe which extends from a recess/sump in the bottom of a compartment and to an elevation in the top of another compartment.
  • Preferred embodiments of the storage system are further explained in claims 2, 3 and 4.
  • fig. 1 shows a floating storage system according to the invention where the storage tank is filled with oil, i.e. a full storage
  • fig. 2 shows the storage system according to fig. 1 which is half full
  • fig. 3 shows the empty storage system above
  • fig. 4 shows alternative designs of serial connections of storage cells in connection with a construction with thin walls
  • - fig. 5 shows alternative designs of serial connections of storage cells in connection with a construction with thick walls
  • the storage system consists of a storage tank 1 and a floating body/shaft 16 which connects the storage tank 1 with a platform deck 17.
  • the storage tank 1 is further divided into five compartments/chambers 7, 8, 9, 10, 11.
  • the compartments 7, 8, 9, 10, 11 are further connected to each other in series by means of one or more pipes 12, 13, 14 and 15 which extend from the bottom of e.g. the compartment 7 to the top of compartment 8, in such a way that liquid communication between the com- partments 7, 8 takes place through the pipe 12.
  • the pipes 12, 13, 14, 15 extend from a cavity/bottom 7b, 8b, 9b, 10b in the bottom of compartments 7, 8, 9, 10, 11 , respectively, to an elevation 8c, 9c, 10c, 11 c at the top of an adjacent compartment 8, 9, 10, 11.
  • the upper ends of each pipe 12, 13, 14, 15 is above the elevation for the lower side of the top plate of the storage facilities, and the bot- tom end of each pipe 12, 13, 14, 15 is below the elevation for the surface of the bottom plate of the storage facilities. This means that no effective volume in the storage "is lost".
  • Figure 4 shows serial connection of storage cells with thin walls (e.g. steel or other metallic construction).
  • the figure shows alternative designs of pipes 12, 13, 14, 15 which extend from a cavity/bottom 7b, 8b, 9b, 10b in the bottom of a chamber 7, 8, 9, 10, 11 to an elevation at the top of the adjacent chamber 8, 9, 0, 11.
  • An alternative shape of a pipe from chamber 10 to chamber 11 is shown as pipe 14' which leads from bottom 0b and which at the half height of the st ⁇ r- age compartment goes through the wall of the storage compartment and continues as pipe 15' which ends in elevation 1 a in storage facilities 11.
  • Figure 5 shows serial connection of storage cells in a construction with thick walls which e.g. can consist of concrete/sandwich.
  • Alternate shapes of the pipes 12, 13 and 14, 15 and bottom 7b, 8b, 9b, 10b and elevation 8a, 9a, 10a, 11a, respectively, are here shown in a manner corresponding to figure 4.
  • a filling/offloading system 2 will extend from the platform deck 17 and into the upper part of compartment 7. Compartment 11 will further be connected via a communication system 3 to sea.
  • the communication system 3 comprises a buffer tank pipe 6 which extends from the lower part of compartment 11 and into the upper part of a buffer/cleaning tank 4.
  • the buffer/cleaning tank 4 is provided with a sea water inlet/outlet 5 in the bottom.
  • the storage tank is shown filled with oil, i.e. full storage.
  • the storage tank 1 only have a mixed layer oil/condensate and water in the lower part of the compartment 11. Over the mixed layer 11 only oil will be present and the rest of compartments 7, 8, 9, 10 will also be filled with oil. Below the border layer in compartment 11 and in the buffer/cleaning tank 4 sea water will be present.
  • Fig. 2 shows the storage system according to fig 1 in a condition where the storage tank 1 is half full. Oil has now been pumped out of the compartment 7 through filling/offloading system 2, and the oil volume taken out has been replaced with water taken in through the seawater intake/discharge 5.
  • Fig. 3 shows the storage system according to fig. 1 and 2 where the oil has been tapped off with exception of a small rest volume at the top of compartment 7.
  • Fig. 1 , 2 and 3 illustrates the manner of operation of the oil storage facilities, and it is evident from the figure and the above description that the main principle of the invention is that each storage tank is divided into a number of compartments which are connected to each other in series. The top of one compartment is connected to the bottom of the next, and the border between water and condensate will occur only in one compartment at a time (some water could be caught in the transitions between the compartments, but the total volume of this is neglectable). Said in a simple way the compartments are placed above each other without this being done physically. In this way one is liberated from the earlier principle of constructing high storage tanks with small areas to maximise the net storage volume and also with regard to the stability of the storage facilities in the sea. The present invention therefore provides more freedom for design of the storage concept as such. It is not necessary to build a high storage construction to get as much effective storage volume as possible.
  • a wet storage which is connected to sea at the bottom and which is filled with oil/condensate, has in the bottom a neutral inside pressure (the same pressure as in the water outside), but in the top there is an inside overpressure which is determined by the height of the storage facilities oil/condensate and the specific weight. Low oil storage facilities can therefore be built and an effective reduction in the maximum differential pressure at the top of the storage occurs, compared to that of high storage facilities.
  • the mixed layer between oil/condensate and water affect the stability of the storage facilities in the sea.
  • the stability will depend on the area of the mixed layer. A large mixed area will give a negative contribution to the stability of the storage facilities and vice versa.
  • the total area of the mixed layer is reduced to a minimum which thereby gives a positive contribution with regard to stability.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Sewage (AREA)
  • Removal Of Floating Material (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

L'invention concerne un système de stockage de pétrole et de condensat à utiliser dans une structure de plate-forme fixe ou flottante. Ce système de stockage se compose d'au moins un réservoir de stockage (1) qui est doté d'un système de remplissage/d'évacuation (2) au sommet et d'un système de communication (3) avec la mer ou avec un réservoir d'eau distinct au fond. Ce réservoir de stockage (1) est séparé en un certain nombre de compartiments (7, 8, 9, 10, 11) qui sont en communication liquide les uns avec les autres par au moins un conduit (12, 13, 14, 15) qui est orienté d'une cavité/bassin (7b, 8b, 9b, 10b) au fond du compartiment (7, 8, 9, 10, 11) vers une élévation (8a, 9a, 10a, 11a) au sommet d'un compartiment différent (8, 9, 10, 11).
PCT/NO2002/000140 2001-04-11 2002-04-11 Systeme de stockage pour petrole et condensat WO2002087964A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR0208841-0A BR0208841A (pt) 2001-04-11 2002-04-11 Sistema de armazenagem para óleo e condensado
CA2443723A CA2443723C (fr) 2001-04-11 2002-04-11 Systeme de stockage pour petrole et condensat
NO20034591A NO326102B1 (no) 2001-04-11 2003-10-13 Lagersystem for olje og kondensat

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20011870A NO20011870D0 (no) 2001-04-11 2001-04-11 Lagersystem for olje og kondensat
NO20011870 2001-04-11

Publications (1)

Publication Number Publication Date
WO2002087964A1 true WO2002087964A1 (fr) 2002-11-07

Family

ID=19912367

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2002/000140 WO2002087964A1 (fr) 2001-04-11 2002-04-11 Systeme de stockage pour petrole et condensat

Country Status (4)

Country Link
BR (1) BR0208841A (fr)
CA (1) CA2443723C (fr)
NO (1) NO20011870D0 (fr)
WO (1) WO2002087964A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010025625A1 (fr) * 2008-09-05 2010-03-11 Wu Zhirong Procédé de remplacement de débit massique spécifique constant pour le ballastage d'eau de mer et de gnl ou de gpl et station en mer multifonctionnelle
CN102322264A (zh) * 2011-05-26 2012-01-18 上海交通大学 天然气水合物开采完井收集运输平台系统
WO2014184520A1 (fr) * 2013-05-15 2014-11-20 Atkins Limited Unité flottante de production, de stockage et de déchargement compacte
CN105501406A (zh) * 2016-02-01 2016-04-20 天津熙盛科技发展有限公司 使用水下柔性储存装置的深水浮式油气平台

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2546156A1 (de) * 1975-10-15 1977-04-21 Hagenuk Neufeldt Kuhnke Gmbh Unterwasser-treibstofftankanordnung
US4685409A (en) * 1984-06-01 1987-08-11 Gotaverken Arendal Ab Device for the storing of oil
US5074715A (en) * 1987-03-04 1991-12-24 Norwegian Contractors A/S Oil storage system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2546156A1 (de) * 1975-10-15 1977-04-21 Hagenuk Neufeldt Kuhnke Gmbh Unterwasser-treibstofftankanordnung
US4685409A (en) * 1984-06-01 1987-08-11 Gotaverken Arendal Ab Device for the storing of oil
US5074715A (en) * 1987-03-04 1991-12-24 Norwegian Contractors A/S Oil storage system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010025625A1 (fr) * 2008-09-05 2010-03-11 Wu Zhirong Procédé de remplacement de débit massique spécifique constant pour le ballastage d'eau de mer et de gnl ou de gpl et station en mer multifonctionnelle
CN102143885B (zh) * 2008-09-05 2013-09-18 吴植融 压载海水与液化天然气或液化石油气的等质量流率置换流程系统和多功能海上基地
US8678711B2 (en) 2008-09-05 2014-03-25 Zhirong Wu Multifunctional offshore base with liquid displacement system
CN102322264A (zh) * 2011-05-26 2012-01-18 上海交通大学 天然气水合物开采完井收集运输平台系统
WO2014184520A1 (fr) * 2013-05-15 2014-11-20 Atkins Limited Unité flottante de production, de stockage et de déchargement compacte
US9828072B2 (en) 2013-05-15 2017-11-28 Atkins Limited Compact floating production, storage and offloading facility
CN105501406A (zh) * 2016-02-01 2016-04-20 天津熙盛科技发展有限公司 使用水下柔性储存装置的深水浮式油气平台

Also Published As

Publication number Publication date
CA2443723C (fr) 2010-11-09
NO20011870D0 (no) 2001-04-11
BR0208841A (pt) 2004-06-29
CA2443723A1 (fr) 2002-11-07

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