EP2500512B1 - Anodes CP remplaçables - Google Patents

Anodes CP remplaçables Download PDF

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Publication number
EP2500512B1
EP2500512B1 EP11158687.1A EP11158687A EP2500512B1 EP 2500512 B1 EP2500512 B1 EP 2500512B1 EP 11158687 A EP11158687 A EP 11158687A EP 2500512 B1 EP2500512 B1 EP 2500512B1
Authority
EP
European Patent Office
Prior art keywords
anode
equipment
support body
tree
well tree
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.)
Not-in-force
Application number
EP11158687.1A
Other languages
German (de)
English (en)
Other versions
EP2500512A1 (fr
Inventor
Robert Bell
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.)
Vetco Gray LLC
Original Assignee
Vetco Gray LLC
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 Vetco Gray LLC filed Critical Vetco Gray LLC
Priority to EP11158687.1A priority Critical patent/EP2500512B1/fr
Priority to MYPI2012001141A priority patent/MY153564A/en
Priority to SG2012018586A priority patent/SG184667A1/en
Priority to US13/422,270 priority patent/US20120234692A1/en
Priority to BR102012005980-0A priority patent/BR102012005980A2/pt
Priority to CN2012100824680A priority patent/CN102677067A/zh
Priority to AU2012201570A priority patent/AU2012201570A1/en
Publication of EP2500512A1 publication Critical patent/EP2500512A1/fr
Application granted granted Critical
Publication of EP2500512B1 publication Critical patent/EP2500512B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/18—Means for supporting electrodes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
    • C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
    • C23F2213/31—Immersed structures, e.g. submarine structures

Definitions

  • This invention relates to anode for cathodic protection of underwater-located equipment and a method for providing corrosion protection of underwater-located equipment.
  • Suitable underwater-located equipment may comprise a well tree for a subsea hydrocarbon fluid extraction facility for example.
  • galvanic anode also known as a "sacrificial anode"
  • CP cathodic protection
  • Such anodes comprise sacrificial metal materials which have a more negative electrochemical potential than the metal of the equipment, such that when deployed, the sacrificial material of the anode is corroded more readily than the equipment metal.
  • the most common metal materials used as the sacrificial material for galvanic anodes include alloys of aluminium, magnesium and zinc, with aluminium and zinc being favoured for subsea use.
  • Fig. 1 A typical such anode is schematically shown in Fig. 1 .
  • the anode comprises a block of aluminium 1, with a metallic leg 2 extending from each end. In use, the free ends of legs 2 are welded onto the well tree.
  • the number of anodes / quantity of aluminium used is a function of the intended field life of the tree. For trees with a long life span, this means that many anodes are required. For example, if calculations show that eight anodes will be required for a field life of twenty years, then all eight anodes will be welded to the tree frame (or other structure) in the workshop. This approach can makes the tree densely populated, and so fitting in many anodes may be difficult, and furthermore can result in anodes having to be closer to vulnerable areas than desired. In addition, placement of the anodes is important - anode positions need to be considered carefully to minimise the dangers of hydrogen embrittlement and to optimise cathodic protection.
  • anode is used to denote an item which includes sacrificial material, and not the sacrifical material itself.
  • ROV remotely operated vehicle
  • anode for cathodic protection of underwater-located equipment comprising:
  • the present invention provides various advantages over the prior art, including, but not limited to:
  • FIG. 2 A first embodiment of the invention is schematically shown in Fig. 2 .
  • an anode 3 in accordance with an embodiment of the invention is shown just prior to deployment at a well tree 4.
  • the anode 3 is designed for manipulation by an ROV, however for clarity the ROV is not shown.
  • Anode 3 comprises an elongate support body 10, which supports and retains a mass of sacrificial material 5. As shown, the sacrificial material 5 is circumferentially moulded around the support body 10.
  • the material 5 may for example comprise a material selected from the group consisting of aluminium, zinc and magnesium, although other materials may be used.
  • support body 10 comprises a member formed as a tapered projection 6. This is shaped so as to enable frictional engagement with the well tree 4, this frictional engagement causing the anode 3 in use to be retained at the tree. More particularly, the projection 6 is tapered so as to be inserted (“stabbed") and retained within a substantially correspondingly shaped receptacle 7 provided at the well tree 4. The taper helps to ensure that electrical continuity is maintained between the anode 6 and tree 4.
  • Receptacle 7 is a new device, specifically adapted for retaining anodes 3, which must be located at the tree prior to anode deployment, e.g. during manufacture.
  • Receptacles 7 are placed at suitable locations on the tree frame that allow relatively simple deployment by ROV.
  • receptacles would be positioned at the exterior of the tree 4, but in other embodiments receptacles could be placed in the body of the tree 4, such that, for example, anode 3 may be inserted into the receptacle in the body of the tree from above (e.g. through a hole in the roof) or below (e.g. using horizontal tracks).
  • Friction is needed to force the surfaces of the projection 6 and receptacle 7 to merge and ensure good electrical contact.
  • a locking mechanism such as a holding latch acts to retain the anode 3 within the receptacle.
  • this locking mechanism would also be actuable by ROV.
  • the latch may have various designs, as would be appreciable to those skilled in the art, such as a screw thread arrangement, or a lock bar / pin, latch, which is relatively simple relatively immune to crustacean damage.
  • the anode 3 is designed for manipulation by an ROV.
  • the anode comprises an ROV-friendly grab handle 8 .
  • the handle is mounted on the support body, at the distal end to the projection 6.
  • Anode 3 also includes buoyancy means for enabling the density of the anode to be selected, in this case comprising an air-filled cavity 9 located within the support body 10.
  • the support body 10 could be considered to comprise a sealed, hollow pipe, of sufficient strength to withstand the ambient pressure at the installation location.
  • the dimensions and / or filling material of the cavity are preferably selected to make the anode 3 substantially buoyancy neutral. This provides various advantages, particularly that the operation to install / replace the anode 3 would be much simpler and more cost effective. Below about one kilometre depth (i.e. the depth of the pycnocline), the density of water does not vary greatly with increasing depth, however it may be preferable to select the appropriate anode buoyancy dependent on the depth of installation. As an alternative, the anode may be made slightly more dense than the sea water at the installation, such that in the event of accidental realease, the anode would sink to the sea floor to facilitate recovery.
  • a suitable installation procedure may be as follows:
  • the anodes would preferably be included in a regular inspection process using ROV (or diver) and camera. Thus visual inspection would determine when replacement would be necessary.
  • ROV or diver
  • the buoyancy cavity 9 may be filled with materials other than air.
  • the buoyancy means may comprise buoyancy tanks attached to the support body for example.
  • the anodes may optionally be fitted with simple current / voltage monitoring means to detect when CP protection lowers to unacceptable levels, indicating that replacement of the anode is required.
  • the current / voltage monitoring means could be connected to a condition monitoring system of the well.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)

Claims (11)

  1. Anode (3) de protection cathodique d'un équipement installé sous l'eau, l'équipement comprenant un arbre de puits sous-marin (4), comprenant :
    un corps de support (10) ;
    un matériau sacrificiel (5) retenu par le corps de support (10) ; et
    un moyen de fixation pour fixer de façon amovible l'anode (3) à l'équipement, caractérisée en ce que
    le moyen de fixation comprend un élément destiné à s'engager par friction avec l'arbre de puits (4), ledit engagement par friction faisant que l'anode (3) soit retenue durant le fonctionnement au niveau de l'arbre de puits (4),
    dans laquelle ledit élément comprend une protubérance effilée (6) depuis le corps de support (10), destinée à être insérée et retenue dans un réceptacle (7) situé au niveau de l'arbre de puits (4).
  2. Anode selon la revendication 1, dans laquelle le moyen de fixation comprend un mécanisme de verrouillage positif à faculté d'ouverture.
  3. Anode selon l'une quelconque des revendications précédentes, comprenant une poignée (8) conçue spécifiquement pour être manipulée par un véhicule télécommandé.
  4. Anode selon la revendication 3, dans laquelle la poignée (8) est montée sur le corps de support (10).
  5. Anode selon la revendication 1, l'anode comprenant un moyen de flottaison pour permettre de sélectionner la densité de l'anode.
  6. Anode selon la revendication 5, dans laquelle le moyen de flottaison comprend une cavité (9) située dans le corps de support (10).
  7. Anode selon la revendication 6, dans laquelle la cavité (9) est remplie d'air.
  8. Anode selon l'une quelconque des revendications précédentes, dans laquelle le matériau sacrificiel (5) comprend l'un du groupe consistant en aluminium, zinc et magnésium.
  9. Procédé de protection contre la corrosion d'un équipement installé sous l'eau, l'équipement comprenant un arbre de puits sous-marin (4), comprenant les étapes consistant à :
    fournir une anode (3) de protection cathodique de l'équipement, l'anode (3) comprenant :
    un corps de support (10), un matériau sacrificiel (5) retenu par le corps de support (10), et un moyen de fixation pour attacher de façon amovible l'anode (3) à l'équipement ; et
    fixer l'anode (3) à l'équipement,
    caractérisé en ce que
    le moyen de fixation comprend un élément destiné à s'engager par friction avec l'arbre de puits, ledit engagement par friction faisant que l'anode (3) soit retenue durant le fonctionnement au niveau de l'arbre de puits (4),
    dans lequel ledit élément comprend une protubérance effilée (6) depuis le corps de support (10), destinée à être insérée et retenue dans un réceptacle (7) situé au niveau de l'arbre de puits (4).
  10. Procédé selon la revendication 9, dans laquelle lequel l'anode (6) est fixée à l'équipement par manipulation d'un véhicule télécommandé.
  11. Procédé selon l'une ou l'autre de la revendication 9 ou de la revendication 10, dans laquelle l'anode (3) est dotée d'un moyen de flottaison pour permettre de sélectionner la densité de l'anode (3).
EP11158687.1A 2011-03-17 2011-03-17 Anodes CP remplaçables Not-in-force EP2500512B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP11158687.1A EP2500512B1 (fr) 2011-03-17 2011-03-17 Anodes CP remplaçables
MYPI2012001141A MY153564A (en) 2011-03-17 2012-03-13 Replaceable cp anodes
SG2012018586A SG184667A1 (en) 2011-03-17 2012-03-14 Replaceable cp anodes
BR102012005980-0A BR102012005980A2 (pt) 2011-03-17 2012-03-16 Ânodo para proteção catódica de equipamento localizado debaixo d'água e me´todo para fornecer proteção contra corrosão de equipamento localizado debaixo d'água
US13/422,270 US20120234692A1 (en) 2011-03-17 2012-03-16 Replaceable cp anodes
CN2012100824680A CN102677067A (zh) 2011-03-17 2012-03-16 可更换的cp阳极
AU2012201570A AU2012201570A1 (en) 2011-03-17 2012-03-16 Replaceable CP anodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11158687.1A EP2500512B1 (fr) 2011-03-17 2011-03-17 Anodes CP remplaçables

Publications (2)

Publication Number Publication Date
EP2500512A1 EP2500512A1 (fr) 2012-09-19
EP2500512B1 true EP2500512B1 (fr) 2014-02-26

Family

ID=44168432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11158687.1A Not-in-force EP2500512B1 (fr) 2011-03-17 2011-03-17 Anodes CP remplaçables

Country Status (7)

Country Link
US (1) US20120234692A1 (fr)
EP (1) EP2500512B1 (fr)
CN (1) CN102677067A (fr)
AU (1) AU2012201570A1 (fr)
BR (1) BR102012005980A2 (fr)
MY (1) MY153564A (fr)
SG (1) SG184667A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103060819A (zh) * 2012-12-24 2013-04-24 青岛钢研纳克检测防护技术有限公司 一种远地式辅助阳极的安装装置
CN108624887B (zh) * 2017-03-20 2023-10-31 中国海洋石油总公司 永久系泊钢缆索接头牺牲阳极卡
FR3123662A1 (fr) * 2021-06-08 2022-12-09 Corrohm Dispositif de protection cathodique d’une structure métallique contre la corrosion

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2372766A (en) * 2001-03-02 2002-09-04 Fmc Corp Debris cap for a christmas tree or wellhead

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484838A (en) * 1982-04-09 1984-11-27 Shell Oil Company Method and apparatus for installing anodes at underwater locations on offshore platforms
US4484840A (en) * 1983-09-28 1984-11-27 Shell Offshore Inc. Method and apparatus for installing anodes on steel platforms at offshore locations
US5902463A (en) * 1997-01-07 1999-05-11 Corrpro Companies, Inc. Submersible anode and method
GB0818348D0 (en) * 2008-10-07 2008-11-12 Statoilhydro Asa Anode installation clamp
US10753002B2 (en) * 2009-07-23 2020-08-25 Wendell W. Goodwin Anode mount assembly
GB2475731B (en) * 2009-11-30 2014-01-22 Vetco Gray Controls Ltd Cathodic protection monitoring

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2372766A (en) * 2001-03-02 2002-09-04 Fmc Corp Debris cap for a christmas tree or wellhead

Also Published As

Publication number Publication date
BR102012005980A2 (pt) 2013-10-29
US20120234692A1 (en) 2012-09-20
AU2012201570A1 (en) 2012-10-04
SG184667A1 (en) 2012-10-30
EP2500512A1 (fr) 2012-09-19
CN102677067A (zh) 2012-09-19
MY153564A (en) 2015-02-27

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