EP3057107A1 - Câble électrique à tube spiralé pour puits profonds - Google Patents

Câble électrique à tube spiralé pour puits profonds Download PDF

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Publication number
EP3057107A1
EP3057107A1 EP15305194.1A EP15305194A EP3057107A1 EP 3057107 A1 EP3057107 A1 EP 3057107A1 EP 15305194 A EP15305194 A EP 15305194A EP 3057107 A1 EP3057107 A1 EP 3057107A1
Authority
EP
European Patent Office
Prior art keywords
power cable
accordance
core layer
conductive material
diameter
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
EP15305194.1A
Other languages
German (de)
English (en)
Other versions
EP3057107B1 (fr
Inventor
Robin K. Sangar
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.)
Nexans SA
Original Assignee
Nexans SA
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 Nexans SA filed Critical Nexans SA
Priority to EP15305194.1A priority Critical patent/EP3057107B1/fr
Priority to NO15305194A priority patent/NO3057107T3/no
Priority to BR102016002491A priority patent/BR102016002491A2/pt
Publication of EP3057107A1 publication Critical patent/EP3057107A1/fr
Application granted granted Critical
Publication of EP3057107B1 publication Critical patent/EP3057107B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H01B7/046—Flexible cables, conductors, or cords, e.g. trailing cables attached to objects sunk in bore holes, e.g. well drilling means, well pumps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/006—Constructional features relating to the conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/04—Concentric cables

Definitions

  • the present invention relates to a power cable as defined in the preamble of claim 1 and an intervention system using such a power cable.
  • EP 2'521'139A disclosing a power cable comprising a plurality of insulated conductors and an armour package surrounding the conductors.
  • the cable comprises elastic materials as center elements and polymer materials arranged between the insulated conductors. In this way the elastic material will function as soft bedding for the insulated conductors and thus allow the conductors to move towards the center due to radial forces applied from the armour package and axial tensile loads in the insulated conductors themselves.
  • each cable core comprises one or more stranded insulated conductors surrounded by one or more polymer layers. These cable cores are then stranded and surrounded by one or more polymer bonded strength members.
  • the metallic conducter(s) is in this prior art cable fully isolated, significantly limiting all currents through these conducter(s) only.
  • the main purpose with the particular configuration of the power cable in WO 2011/146353 is not to provide a cable that may withstand high tensile strains due to its weight, but to provide a cable for use with a downhole motor that is capable of withstanding the extreme environment downhole such as corrosion from well fluids.
  • the invention concerns a power cable suitable for providing power to a downhole tool situated within a deep well.
  • the power cable comprises a plurality of stranded cable cores, where each cable core comprises one or more inner conductors comprising one or more first conductive materials, one or more armour core layers surrounding the inner conductor(s) comprising one or more second conductive materials having higher tensile strength than the one or more first conductive materials and one or more outer conducting core layers surrounding the one or more armour core layers, comprising one or more third conductive materials, wherein the one or more inner conductors, the one or more armour core layers and the one or more outer conducting core layers are electrically connected to each other along a major part, preferably all, of the cable core's longitudinal length.
  • conductive material signifies any material or combination of materials (e.g. mixture / alloys) that exhibits conductivity per unit length ( ⁇ ) of more than 1x10 4 S/m at 20°C (293 K) along at least part of the power cable, preferably along the whole length of the power cable.
  • the conductivity per unit length of the first and third conductivity materials is preferably more than 1x10 6 S/m at 20°C, for example more than 1x10 7 S/m, at 20°C.
  • At least one of the materials constituting the one or more first conductive materials is identical to at least one of the materials constituting the one or more third conductive materials.
  • more than 50 % of the conductive material(s) within at least one of the first and third conductive material is copper.
  • the conductivity per unit length at 20°C of the first and third conductive material is higher than the conductivity per unit length at 20°C of the second conductive material.
  • more than 50 % of the conductive material(s) within the second conductive material is composed of an iron based alloy such as steel.
  • At least the majority of the interstices formed within the armour core layer is filled with a pressure compensating filling material comprising an elastic material such as petroleum jelly inter alia in order to avoid crack formation.
  • the armour core layer comprises a plurality of radial layers of armouring wires, the wires being mutually arranged in the radial direction in order to maximize the armour core layer density.
  • the armour core layer comprises an inner radial layer comprising a plurality of armouring wires with a diameter D and an outer radial layer electrically contacting the inner radial layer, the outer radial layer comprising a plurality of armouring wires with a diameter d, the diameter d being dissimilar to the diameter D, preferably smaller.
  • the ratio between the diameter D and diameter d may be at least 1.25.
  • the outer radial layer further comprises a plurality of armouring wires with diameter D' arranged at least partly between the armouring wires with the diameter d and at least partly between the armouring wires with the diameter D of the inner radial layer 6', wherein the diameter D' is larger than the diameter d .
  • the plurality of armouring wires constituting the radial layers is mutually arranged in a two-dimensional closed packed structure.
  • the outermost surface positions of the armouring wires defining the outer periphery of the armour core sheath constitute positions on a circle.
  • an outer insulating core layer surrounds the outer conducting core layer, which outer insulating layer preferably comprising mainly a fluorine based polymer, for example a fluorine based polymer within the group poly/ethane-co-tetrafluoroethene (ETFE), fluorinated ethylene propylene (FEP), perfluoroethers (PFA), ethylene-fluorinated ethylene propylene (EFEP).
  • ETFE group poly/ethane-co-tetrafluoroethene
  • FEP fluorinated ethylene propylene
  • PFA perfluoroethers
  • EFEP ethylene-fluorinated ethylene propylene
  • the invention also concerns an intervention system suitable for pumping hydrocarbon from a hydrocarbon production well.
  • the intervention system comprises a downhole tool such as a pump situated within the well, a pipe extending to the downhole tool and a power cable in accordance with any of the configurations mentioned above, which power cable extends along the longitudinal direction of the pipe and is electrically connected to the downhole tool.
  • FIG. 1 A cross section of a power cable 1 in accordance with the invention is shown in figure 1 .
  • the power cable 1 comprises three stranded cable cores 2 surrounded by a filling material 3 such as a pressure filling compound and an outer cable sheath 4 providing outer protection of the cable 1.
  • the outer cable sheath 4 may be a polymer sheath such as a fluorine based plastic, for example of type ethylene tetrafluoroethylene (ETFE).
  • An optical fibre 9 may optionally be arranged in the centre of the power cable 1 for transmitting optical signals.
  • Each of the cable cores 2 (or power phases) comprises one or more inner conductors 5 of high conductive material(s) such as copper.
  • this centrally located core conductors 5 are surrounded by an armour core sheath 6 of a conductive material, which armour core sheath exhibits higher tensile strength than the inner core conductor(s) 5 in order to, inter alia, achieve the strength necessary for the cable 1 to carry its own weight at large sea depths, i.e. depths of several kilometres, for example more than 5 kilometres.
  • this armour core sheath 6 comprises radial layers 6',6" made of a plurality of steel armouring wires 6a,6b,6c which are mutually arranged to reach highest possible, or close to highest possible, density.
  • Figure 1 shows an inner radial layer 6' of armouring wires with a wire diameter D 6a arranged in contact with the insulating sheath 3, and an outer radial layer 6" of armouring wires 6b, 6c surrounding the inner radial layer 6', wherein wires of a small wire diameter d 6c alternates with wires of a larger diameter D ' 6b, for example equal to the wire diameter D .
  • each armouring wires 6b, 6c constituting the outer radial layer 6" in figure 1 represents points on a perfect, or near perfect, circle having the inner core conductor(s) 5 as a centre.
  • conductive materials with high tensile strength may be various steel types, tungsten, titanium alloys and aluminium alloys.
  • a filling compound of an elastic material, typically a petroleum jelly, may be inserted within the interstices of the armouring wires to ensure sufficient pressure compensation during operation, and consequently reduce the risk of crack formation.
  • the armour core sheath 6 is in the embodiment of figure 1 surrounded by an outer conducting core layer 7.
  • This layer may be of identical material(s) as the inner conductor(s) 5, for example copper.
  • This outer conducting core layer 7 is surrounded by an outer insulating core layer 8 preferably of a flour-based polymer such as ETFE (ethylene tetrafluoroethylene).
  • ETFE ethylene tetrafluoroethylene
  • the inner conductor(s) 5, the armour sheath 6 and the outer conducting core layer 7 are all electrically connected along at least the major part of the cable core 2 to maximise the radial cross section in which electrical power may flow.
  • Typical dimensions of the cable core 2 are
  • the power cable 1 with three of the cable cores 2 stranded together is typically arranged in order to support a cable weight of at least 3 km sea depth, for example 4 km sea depth.
  • the weight of the power cable 1 may be within the range 1.5-2.5 kg/m, for example about 2 kg/m.
  • the power cable 1 may be used as part of a coiled tubing system for providing power to a downhole pump or any other power demanding downhole tools, situated within a deep hydrocarbon producing well.

Landscapes

  • Insulated Conductors (AREA)
EP15305194.1A 2015-02-10 2015-02-10 Câble électrique à tube spiralé pour puits profonds Active EP3057107B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15305194.1A EP3057107B1 (fr) 2015-02-10 2015-02-10 Câble électrique à tube spiralé pour puits profonds
NO15305194A NO3057107T3 (fr) 2015-02-10 2015-02-10
BR102016002491A BR102016002491A2 (pt) 2015-02-10 2016-02-04 cabo de alimentação de tubulação espiralada para poços profundos

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15305194.1A EP3057107B1 (fr) 2015-02-10 2015-02-10 Câble électrique à tube spiralé pour puits profonds

Publications (2)

Publication Number Publication Date
EP3057107A1 true EP3057107A1 (fr) 2016-08-17
EP3057107B1 EP3057107B1 (fr) 2018-01-10

Family

ID=52595243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15305194.1A Active EP3057107B1 (fr) 2015-02-10 2015-02-10 Câble électrique à tube spiralé pour puits profonds

Country Status (3)

Country Link
EP (1) EP3057107B1 (fr)
BR (1) BR102016002491A2 (fr)
NO (1) NO3057107T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106298003A (zh) * 2016-08-31 2017-01-04 张家港市华扬冶金机械有限公司 一种混凝土加工机械专用电缆
CN107086069A (zh) * 2017-05-22 2017-08-22 郑行良 一种高空电缆

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2435347A (en) * 2006-02-17 2007-08-22 Nexans Electric Submarine Power Cable and System for Directing Electric Heating
WO2011146353A2 (fr) 2010-05-17 2011-11-24 Schlumberger Canada Limited Câble destiné à être utilisé avec une pompe de fond
EP2521139A1 (fr) * 2011-05-02 2012-11-07 Nexans Câble de puissance haute tension pour applications en eaux ultra profondes
WO2014062061A1 (fr) * 2012-10-18 2014-04-24 C6 Technologies As Câble électrique pour intervention dans un puits pétrolier à tige composite en fibres

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2435347A (en) * 2006-02-17 2007-08-22 Nexans Electric Submarine Power Cable and System for Directing Electric Heating
WO2011146353A2 (fr) 2010-05-17 2011-11-24 Schlumberger Canada Limited Câble destiné à être utilisé avec une pompe de fond
EP2521139A1 (fr) * 2011-05-02 2012-11-07 Nexans Câble de puissance haute tension pour applications en eaux ultra profondes
WO2014062061A1 (fr) * 2012-10-18 2014-04-24 C6 Technologies As Câble électrique pour intervention dans un puits pétrolier à tige composite en fibres

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106298003A (zh) * 2016-08-31 2017-01-04 张家港市华扬冶金机械有限公司 一种混凝土加工机械专用电缆
CN107086069A (zh) * 2017-05-22 2017-08-22 郑行良 一种高空电缆
CN107086069B (zh) * 2017-05-22 2023-07-25 永靖马世基智能环保科技有限公司 一种高空电缆

Also Published As

Publication number Publication date
NO3057107T3 (fr) 2018-06-09
EP3057107B1 (fr) 2018-01-10
BR102016002491A2 (pt) 2016-08-16

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