EP1065674B1 - Câble de fond de puits - Google Patents

Câble de fond de puits Download PDF

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Publication number
EP1065674B1
EP1065674B1 EP00305534A EP00305534A EP1065674B1 EP 1065674 B1 EP1065674 B1 EP 1065674B1 EP 00305534 A EP00305534 A EP 00305534A EP 00305534 A EP00305534 A EP 00305534A EP 1065674 B1 EP1065674 B1 EP 1065674B1
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EP
European Patent Office
Prior art keywords
cable
downhole cable
downhole
conductors
load
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.)
Expired - Lifetime
Application number
EP00305534A
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German (de)
English (en)
Other versions
EP1065674A3 (fr
EP1065674A2 (fr
Inventor
Paul Hazel
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.)
Meta Downhole Ltd
Original Assignee
Read Well Services 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 Read Well Services Ltd filed Critical Read Well Services Ltd
Publication of EP1065674A2 publication Critical patent/EP1065674A2/fr
Publication of EP1065674A3 publication Critical patent/EP1065674A3/fr
Application granted granted Critical
Publication of EP1065674B1 publication Critical patent/EP1065674B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01B9/04—Concentric cables

Definitions

  • the invention relates to a downhole cable, particularly for use in oil or gas wells for conveying data sensors into and out of the wellbore, and for communication between surface equipment and sensors and other apparatus downhole, particularly logging tools and drive units for inserting logging tools into a well, such a drive unit typically being a downhole tractor.
  • braided wire cables are used downhole in oil and/or gas wells or water injector wells (which are used to inject water into an oil or gas well to increase the pressure within that well and hence the production rates therefrom) to run in electrically operated logging tools and other electrically operated tools.
  • These conventional braided wire cables comprise one or more conductors laid side by side, each surrounded by an insulating material, and which together form the core of the cable.
  • the insulated conducting core is then surrounded by two layers of steel wires which act as all of the following features:-
  • Such conventional braided wire cables suffer from several disadvantages however. Firstly, since the outer surface of the cable is braided, the cable must be inserted into, and pulled from, the well through a grease injection unit and stuffing box.
  • the grease injection unit basically provides a chamber filled with grease at relatively high pressure, such that the grease works its way into the interstices between the braids so that the pressure of the well is contained. This pressure control arrangement necessarily requires a large amount of grease, and is relatively time consuming.
  • the fact that the outer steel wires carry the electrical current return is an inherent safety risk, particularly since the environment of use of the braided wire cable contains high pressure hydrocarbons, and hence has great implications for Health and Safety which is a particularly relevant consideration in the Norwegian oil and gas sector.
  • this conventional braided wire cable is relatively heavy, in the region of 120kg/1000m for a typical 7/32" (5.6mm) braided monoconductor cable.
  • a downhole cable arranged for insertion into a wellbore and capable of withstanding downhole pressures and temperatures or a water injector well, the downhole cable comprising a pair of conductors for transmission of power and/or data, and a load-bearing member, wherein the load-bearing member is separate from the pair of conductors, wherein the pair of conductors and the load-bearing member form an inner core; and the downhole cable further comprises a non-conductive outer sheath and the inner core is surrounded by the outer sheath; characterised in that the load-bearing member comprises a material in the form of a yarn or fibre, wherein the yarn or fibre material is wound or weaved around at least one of the conductors.
  • the outer sheath is typically non-conductive in the sense that it substantially prevents conduction of electricity.
  • the downhole cable of the invention can incorporate a fibre optic cable.
  • the pair of conductors preferably comprise a first conductor having an electricity conducting core, formed from a metal material such as copper, and a second conductor formed from an electricity conducting sheath, typically formed from a metal material such as copper.
  • the pair of conductors are preferably capable of transmitting power to and from downhole sensors.
  • the pair of conductors are preferably arranged co-axially.
  • the conductors are preferably also capable of transmitting data, such that they act as telemetry conduits. Additional conductors or telemetry conduits can optionally be provided in the cable of the invention for transmitting electrical and optical data and instructions to and from sensors in the well.
  • the cable may comprise more than two conductors.
  • the load-bearing member preferably comprises a sleeve surrounding the conductors and, if present, additional telemetry conduits.
  • a preferred material for the load-bearing member is a polymer fibre or yarn, and preferably a fibre such as Zylon ( TM ) PBO (poly(p-phenylene-2,6-benzobisoxazole)), polyamide or polybenzimidazole, which is woven or wound around the inner core, optionally as it is being made.
  • an aramid fibre such as Kevlar ( TM ) may be utilised as the material for the load bearing-member.
  • Aramid materials are aromatic polyamides (in particular poly(p-phenylene terephthalamide)).
  • Zylon ( TM ) is similar to aramid material in that it is also classed as a liquid crystalline polymer.
  • the strength of the cable can be increased by increasing the quantity of fibre in the cable.
  • Any suitable polymer fibre can be used, for example, any polymer fibre with a chemical structure based on repeating aromatic structures such as aramids derived from aromatic acids and amines with linkages on the para position of the aromatic ring structure, and derived from terephthalic acid and p-phenylene diamine or p-aminobenzoic acid.
  • the outer sheath preferably comprises a plastics material such as PEEK ( TM ) (Polyether ethyl ketone) or FEP ( TM ) (Fluorinated Ethylene Propylene).
  • TM Polyether ethyl ketone
  • FEP Fluorinated Ethylene Propylene
  • the outer sheath comprises a material such as polyethelene which typically has been treated, for example by electron beam irradiation, to render it more inert chemically, if necessary.
  • the outer sheath is non-conducting so as to insulate the cable from the environment.
  • the outer sheath can also protect the cable from damage by external abrasion, and can also reduce internal damage to tubulars through which the cable is deployed, when compared to the damage produced by conventional braided wire cables.
  • the outer sheath can insulate the environment from the cable by resisting electrical discharge from the cable to the environment.
  • the outer surface of the outer sheath is preferably smooth and typically comprises a low friction surface.
  • the outer sheath can be colour coded to indicate wear and the need for replacement or re-coating.
  • the load-bearing member comprising the Zylon ( TM ) sleeve preferably also provides wear and crush protection, and can also insulate the cable from adverse effects of pressure differentials experienced downhole.
  • the fibre optics telemetry cables can be included in the woven sleeve.
  • the two or more conductors and, if present, further telemetry conduits are preferably insulated from one another by sheaths or other insulating members.
  • a first electrical insulation material which is preferably ETFE ( TM ) (a fluoropolymer), is arranged between the first and second conductors, such that the first electrical insulation material surrounds the first (inner) conductor.
  • the second conductor which is preferably in the form of the conductive braid, is itself preferably surrounded by a second electrically insulating material, preferably formed from ETFE ( TM ), and which typically has an outer diameter in the region of ⁇ 2.5mm.
  • the cable may be manufactured by arranging the conductors and, if present, the further telemetry conduit(s) co-axially.
  • the cable of the invention may be manufactured by arranging the conductors and if present further telemetry conduits side by side and weaving or winding the (preferably Zylon ( TM )) sleeve over the assembled conductors and, if present, further telemetry conduits during production, so as to obtain a continuous length of finished cable.
  • the (preferably Zylon ( TM )) sleeve over the assembled conductors and, if present, further telemetry conduits during production, so as to obtain a continuous length of finished cable.
  • Internal sheaths can be moulded or fitted onto the outer surface of the conductors as required during assembly, and likewise, the outer sheath can be extruded over the outer surface of the (preferably Zylon ( TM )) sleeve.
  • the outer sheath can be extruded over the outer surface of the (preferably Zylon ( TM )) sleeve.
  • a downhole cable 10 in accordance with the present invention is shown in Fig. 1, and comprises two nickel coated copper conductors 12, 14 arranged co-axially.
  • the first copper (inner) conductor 12 may be a single strand or may comprise a plurality of strands, and the first (inner) conductor 12 is in the region of ⁇ 1mm outer diameter and the second copper (outer) conductor 14 is preferably in the form of a conductive braid 14 (i.e. many relatively thin strands).
  • the second conductor 14 in the form of the conductive braid 14 surrounds the first electrical insulation material 13.
  • the second conductor 14 in the form of the conductive braid 14 is itself surrounded by a second electrically insulating material 15, preferably formed from ETFE ( TM ), and which has an outer diameter in the region of ⁇ 2.5mm.
  • the first (inner) conductor 12, the first layer of electrical insulation coating 13, the second (outer) conductor 14 and the second layer of electrical insulation coating 15 together form the core of the cable 10.
  • the coaxial core of the cable 10 is surrounded by a strength bearing member 16 of Zylon ( TM ) yarns 16, which is typically in the region of ⁇ 4mm outer diameter. Thereafter, the layer of Zylon ( TM ) yarns 16 is in turn surrounded by a low friction, smooth, and hard wearing (abrasion resistant) and electrically insulating outer sheath 18 which typically has an outer diameter in the region of ⁇ 5mm.
  • the outer sheath 18 is preferably formed from PEEK ( TM ) or FEP ( TM ).
  • the downhole cable 10 of the present invention may be manufactured is as follows.
  • the core of the cable is typically formed into extremely long lengths such as 6.71 km (22,000 ft) lengths, and is then passed through weaving apparatus which weaves the Zylon ( TM ) coating 16 over the core as it is passing through the weaving apparatus.
  • the PEEK ( TM ) or FEP ( TM ) sheath 18 is extruded over the woven Zylon ( TM ) layer 16 further down the production line.
  • a PETP ( TM ) tape 17 can be wound around the Zylon ( TM ) yarn 16 after it is woven over the conductors 12, 14, such that the PEEK ( TM ) or FEP ( TM ) sheath 18 is extruded over the PETP ( TM ) tape.
  • the presence of the PETP ( TM ) tape 17 provides the advantage that the PETP ( TM ) tape 17 holds and binds the Zylon ( TM ) fibres 16 together, thus increasing their strength and useable lifespan.
  • the PETP ( TM ) tape 17 comprises polyamide which is a polymer of amides and is the base material in the tape 17 known as Kapton ( TM ) (or its equivalent Apical ( TM )), and although PETP ( TM ) tape 17 is preferred, any suitable polymer tape 17, such as polyamide, for example, could be used.
  • the first (inner) conductor 12 preferably comprises 16awg nickel coated copper.
  • the weight of the downhole cable 10 is critically important, since the weight must not be so great that the cable 10 would break under its own weight if a very long length is free hanging.
  • the approximate weights and diameters of each element are as follows:- Element Weight (g/m) Diameter (mm) Centre conductor 12 5.4 1.00 Insulation 13 1.7 1.50 Metal braid 14 6.2 2.03 Second insulation 15 3.7 2.59 Zylon ( TM ) yarns 9.8 4.00 PETP ( TM ) tape 0.3 4.10 Outer sheath 9.7 5.10
  • the cable has the following technical characteristics:- Conductors 12,14 Co-axial core: Nickel coated copper 12,14 with fluoropolymer ETFE ( TM ) insulation 13, 15 or silver plated annealed copper or plain copper. Current rating 2 Amps D.C.
  • the first copper (inner) conductor may be a single strand or may comprise a plurality of strands
  • the second copper (outer) conductor is preferably in the form of a braid (i.e. many relatively thin strands).
  • a fluoropolymer insulation coating is arranged between the first and second conductors.
  • a second insulation coating is provided around the outer circumference of the second (outer) conductor.
  • One or more optical fibres are wound in a spiral about the second insulation coating.
  • the first (inner) conductor, the electrical insulation coating, the second (outer) conductor, the second insulation coating and the one or more optical fibres form the core of the cable.
  • the optical fibre(s) is/are suitable for data communication and temperature profiling.
  • the conductors and optical fibres are formed separately intro 6.71 km (22,000 ft) lengths and gathered together in the required configuration before being passed through weaving apparatus which weaves a Zylon ( TM ) coating over the core as it is passing through the weaving apparatus.
  • a polyethylene sleeve is moulded over the woven Zylon ( TM ) further down the production line.
  • a PETP ( TM ) tape can be wound around the Zylon ( TM ) yarn after it is woven over the conductors and optical fibres.
  • Example 2 The approximate weights and diameters of the downhole cable of Example 2 are broadly the same as for Example 1.
  • the cable has the following technical characteristics:- Conductors Co-axial core with one or more optical fibre(s). Nickel coated copper with fluoropolymer insulation or silver plated annealed copper or plain copper. Optic Fibres One or more fibres, suitable for data communication and temperature profiling. Current rating 2 Amps D.C.
  • a cable is constructed as described in Example 1, but the Zylon ( TM ) sleeve is formed by winding the yarn around the inner core during assembly rather than weaving it around the core.
  • a downhole cable is constructed as described in Example 1, but the core of the downhole cable differs in that the two nickel coated copper conductors are arranged side by side with fluoropolymer insulation coating around each of the two conductors.
  • this is a less preferred embodiment than Example 1 since the core of Example 4 will not be perfectly circular, which means that the application of the Zylon ( TM ) layer may be more difficult.
  • a downhole cable is constructed as described in Example 4, but the core of the downhole cable differs in that the two nickel coated copper conductors are arranged side by side with fluoropolymer insulation coating around each of the two conductors, and one or more, such as two, optical fibres are arranged to nest between the side by side conductors.
  • this is a less preferred embodiment than Example 1 since the core of Example 5 will also not be perfectly circular, although it is likely to be more circular than the core of Example 4, and hence as with Example 4, the application of the Zylon ( TM ) layer for the downhole cable of Example 5 may be more difficult.
  • the number of conductors and optical fibres can clearly be varied as can the characteristics, for example three or more optical fibres can be included although normally two conductors will be sufficient.
  • the protective outer sheath can be replaced if worn.
  • the Zylon ( TM ) sleeve can be woven in advance and wrapped or passed over the cores etc.
  • Certain embodiments of the cable can be used for powering tractors (devices which can move along the horizontal sections of oil wells to deploy tools or measurement devices) enabling an extended reach into the well by the tractors as a direct consequence of the cables lightweight construction. Furthermore the including of a fibre optic cable would enable concurrent tractor deployment and measurement of well parameters.
  • Certain embodiments of the invention provide a lighter easier to handle cable capable of supporting greater loads over its own weight than conventional slick line or electric line cables.
  • Other benefits arise in safety, environmental, operations and logistics areas.
  • the embodiments of the downhole cable described herein differ from existing braided wire line cable technology in that all electric signals (telemetry and power) are conveyed on the central co-axial core and not on the external armouring, thus making the cable intrinsically electrically safe. This has implications for Health and Safety which is a particularly relevant consideration in the Norwegian sector.
  • the embodiments of the downhole cable described herein have similar strength capabilities to a conventional braided wire steel cable but are capable of achieving the same strength at a far lower weight (7kg/1000m in water compared to 120kg/1000m for a typical 7/81.3 cm (32") braided monoconductor cable).
  • the main reason for this weight reduction is the Zylon ( TM ) fibre yarns, which although being relatively light, provide the load bearing capability to the downhole cable.
  • the low friction surface provided by the PEEK ( TM ) or FET ( TM ) outer sheath provides the advantage that the embodiments of the downhole cable described herein are more suited to horizontal or highly deviated wells or to deep wells than the conventional braided wire cables, since the tension pulled at surface is closer to the tension pulled at the tool string with the present embodiments. This is an important consideration during logging operations since there is a limit as to the tension which can be applied at surface (50% of the breaking load at surface is considered the safe working limit). It also means the downhole cable of the present embodiments is more suited to wells where the tools will be deployed using a tractor since there is less weight and also less drag for the tractor to pull along the interior of the wellbore.
  • the outer surface of the downhole cable of the present embodiments is substantially smooth, more complex pressure control apparatus such as grease injectors are not required, and more simplified pressure control apparatus, such as an annular rubber seal arrangement, can be utilised to control the wellbore pressure.

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  • Insulated Conductors (AREA)
  • Communication Cables (AREA)

Claims (18)

  1. Un câble de fond (10) arrangé pour être inséré dans un puits de forage et capable de supporter des pressions et des températures de fond ou un puits injecteur d'eau, le câble de fond (10) comportant une paire de conducteurs (12, 14) destinés à la transmission de puissance et/ou de données, et un élément porteur (16), dans lequel l'élément porteur (16) est distinct de la paire de conducteurs (12, 14), dans lequel la paire de conducteurs (12, 14) et l'élément porteur (16) forment un coeur interne ; et le câble de fond (10) comporte de plus une gaine externe (18) non conductrice et le coeur interne est entouré par la gaine externe (18) ;
    caractérisé en ce que l'élément porteur (16) comporte un matériau en forme de fil ou de fibre, dans lequel le matériau en fil ou en fibre est enroulé ou tissé autour d'au moins un des conducteurs (12, 14).
  2. Un câble de fond (10) selon la revendication 1, comportant de plus un câble à fibre optique.
  3. Un câble de fond (10) selon soit la revendication 1, soit la revendication 2, dans lequel les conducteurs (12, 14) comportent des fils électroconducteurs, et sont capables de transmettre une puissance à des capteurs de fond et d'en recevoir de ceux-ci.
  4. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel la paire de conducteurs (12, 14) comporte un premier conducteur (12) ayant un coeur électroconducteur (12), et un deuxième conducteur (14) formé à partir d'une gaine électroconductrice (14).
  5. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel la paire de conducteurs (12,14) est arrangée de façon coaxiale.
  6. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel les conducteurs (12, 14) sont aussi capables de transmettre des données, de telle sorte qu'ils font office de conduits de télémesure.
  7. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel des conducteurs ou des conduits de télémesure additionnels sont fournis dans le câble de fond (10) pour transmettre des données électriques et/ou optiques et/ou des instructions à des capteurs situés au fond dans le puits, et pour en recevoir.
  8. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel l'élément porteur est un manchon (16) entourant la paire de conducteurs (12, 14).
  9. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel l'élément porteur (16) est un matériau tissé en fibre ou en fil polymère.
  10. Un câble de fond (10) selon la revendication 9, dans lequel l'élément porteur tissé comporte une fibre sélectionnée parmi le Zylon (™), le PBO (poly(p-phénylène-2, 6-benzobisoxazole)), le polyamide ou le polybenzimidazole.
  11. Un câble de fond (10) selon soit la revendication 9, soit la revendication 10, dans lequel la résistance du câble de fond (10) peut être augmentée en augmentant la quantité de fibre dans le câble de fond (10).
  12. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel la gaine externe (18) comporte un matériau en plastique.
  13. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel la gaine externe (18) est non conductrice de façon à isoler le câble de fond (10) de l'environnement.
  14. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel la gaine externe (18) est capable de protéger le câble de fond (10) de l'endommagement causé par l'abrasion externe, et réduit aussi l'endommagement interne infligé à des tubulaires enrobés au travers desquels est déployé le câble de fond (10).
  15. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel la gaine externe (18) est capable d'isoler l'environnement du câble de fond (10) en résistant à la décharge électrique provenant du câble de fond (10) sur l'environnement.
  16. Un câble de fond (10) selon la revendication 10, ou n'importe lesquelles des revendications 11 à 15 lorsqu'elles dépendent de la revendication 10, dans lequel l'élément porteur (16) comportant le manchon en Zylon (™) 16 est capable de fournir une protection contre l'usure et l'écrasement, et d'isoler le câble de fond (10) des effets adverses de différentiels de pression subis au fond.
  17. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel les deux conducteurs ou plus (12,14) sont isolés l'un de l'autre par une gaine électro-isolante (13).
  18. Un câble de fond (10) selon n'importe quelle revendication précédente, dans lequel le câble (10) comporte au moins les matériaux suivants, dans l'ordre en partant du centre du câble (10) et en allant vers l'extérieur :
    (a) le premier conducteur (12) ayant un coeur électroconducteur (12) ;
    (b) une gaine électro-isolante (13) ;
    (c) le deuxième conducteur (14) formé à partir d'une gaine électroconductrice (14) ;
    (d) une deuxième gaine électro-isolante (15) ;
    (e) l'élément porteur (16) comportant un manchon (16) ;
    f) une gaine externe non conductrice (18).
EP00305534A 1999-06-30 2000-06-30 Câble de fond de puits Expired - Lifetime EP1065674B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9915141 1999-06-30
GBGB9915141.7A GB9915141D0 (en) 1999-06-30 1999-06-30 Cable

Publications (3)

Publication Number Publication Date
EP1065674A2 EP1065674A2 (fr) 2001-01-03
EP1065674A3 EP1065674A3 (fr) 2001-12-05
EP1065674B1 true EP1065674B1 (fr) 2006-11-02

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EP00305534A Expired - Lifetime EP1065674B1 (fr) 1999-06-30 2000-06-30 Câble de fond de puits

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EP (1) EP1065674B1 (fr)
GB (1) GB9915141D0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009102738A1 (fr) * 2008-02-12 2009-08-20 The Government Of The United States Of America, As Represented By The Secretary Of The Navy Câble haute tension à haute température
WO2009143461A2 (fr) * 2008-05-23 2009-11-26 Halliburton Energy Services, Inc. Câble en fond de trou
US10529468B2 (en) 2015-11-12 2020-01-07 Halliburton Energy Services, Inc. Enhanced data and power wireline

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NO315386B1 (no) * 2000-02-21 2003-08-25 Fmc Kongsberg Subsea As Anordning og fremgangsmåte for intervensjon i en undersjöisk brönn
FR2831703B1 (fr) * 2001-10-25 2003-12-26 Sagem Cable d'energie ou de communication adapte a etre enterre
US7009113B2 (en) 2003-01-22 2006-03-07 Schlumberger Technology Corporation High temperature electrical cable having interstitial filler
EP2021407B1 (fr) * 2006-05-22 2016-03-09 Prysmian S.p.A. Câble et procédé de fabrication de celui-ci
US8547246B2 (en) * 2007-10-09 2013-10-01 Halliburton Energy Services, Inc. Telemetry system for slickline enabling real time logging
US9035185B2 (en) 2010-05-03 2015-05-19 Draka Holding N.V. Top-drive power cable
EP2567386B1 (fr) * 2010-05-03 2016-08-31 Draka Holding N.V. Câble d'alimentation pour système d'entraînement supérieur pour appareil de forage
US9347488B2 (en) * 2012-03-23 2016-05-24 Seal-Ryt Corporation Seal-bearing assembly
US8814432B2 (en) * 2012-03-23 2014-08-26 Seal-Ryt Corporation Seal-bearing assembly
US9601237B2 (en) 2014-03-03 2017-03-21 Baker Hughes Incorporated Transmission line for wired pipe, and method
CN105355282B (zh) * 2015-11-25 2017-06-13 安徽光复电缆有限公司 一种带有三色或四色螺旋状色条的氟塑料绝缘安装线
US11471349B2 (en) 2018-09-17 2022-10-18 Liko Research & Development Ab Patient lift system
CN111899947A (zh) * 2020-08-03 2020-11-06 王社兵 一种低损耗稳相电缆

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US3773109A (en) * 1970-10-29 1973-11-20 Kerr Mc Gee Chem Corp Electrical cable and borehole logging system
DE4004802A1 (de) * 1990-02-13 1991-08-14 Siemens Ag Elektrisches kabel mit tragorgan und zwei konzentrisch angeordneten leitern
FR2668643B1 (fr) * 1990-10-30 1995-03-17 Mediterranee Const Ind Cable conducteur a haut taux de remplissage.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009102738A1 (fr) * 2008-02-12 2009-08-20 The Government Of The United States Of America, As Represented By The Secretary Of The Navy Câble haute tension à haute température
WO2009143461A2 (fr) * 2008-05-23 2009-11-26 Halliburton Energy Services, Inc. Câble en fond de trou
WO2009143461A3 (fr) * 2008-05-23 2010-01-14 Halliburton Energy Services, Inc. Câble en fond de trou
US8369667B2 (en) 2008-05-23 2013-02-05 Halliburton Energy Services, Inc. Downhole cable
US10529468B2 (en) 2015-11-12 2020-01-07 Halliburton Energy Services, Inc. Enhanced data and power wireline

Also Published As

Publication number Publication date
EP1065674A3 (fr) 2001-12-05
GB9915141D0 (en) 1999-09-01
EP1065674A2 (fr) 2001-01-03

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