EP0880147A1 - Câble électrique multiconducteur - Google Patents

Câble électrique multiconducteur Download PDF

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Publication number
EP0880147A1
EP0880147A1 EP98301355A EP98301355A EP0880147A1 EP 0880147 A1 EP0880147 A1 EP 0880147A1 EP 98301355 A EP98301355 A EP 98301355A EP 98301355 A EP98301355 A EP 98301355A EP 0880147 A1 EP0880147 A1 EP 0880147A1
Authority
EP
European Patent Office
Prior art keywords
ethylene propylene
jacket
electrical
tapes
electrical cable
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.)
Withdrawn
Application number
EP98301355A
Other languages
German (de)
English (en)
Inventor
Marcus D. Mchugh
Howard A. Oswald
Julia Atkeisson
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.)
Camco International Inc
Original Assignee
Camco International Inc
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 Camco International Inc filed Critical Camco International Inc
Publication of EP0880147A1 publication Critical patent/EP0880147A1/fr
Withdrawn legal-status Critical Current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
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/2806—Protection against damage caused by corrosion

Definitions

  • the present invention relates to multiconductor electrical cables and, more particularly, to multiconductor electrical cables for use in subterranean wellbores.
  • Multiconductor electrical cables used to power wellbore equipment must be capable of withstanding the high temperatures, high pressures and/or corrosive fluids often encountered within subterranean wellbores.
  • high temperature means temperatures of greater than about 175 F and as high as about 500 F.
  • high pressure means pressures of at least 500 psi and as high as about 5,000 psi.
  • corrosive fluids means liquids and gases which can cause degradation to cable insulating materials and/or corrosion to the electrical conductors, such as liquids and/or gases containing hydrogen sulphide, carbon dioxide, water, and the like.
  • the present invention has been contemplated to overcome the foregoing deficiencies and meet the above described needs.
  • the present invention is a multiconductor electrical cable for use in a subterranean wellbore and comprises a plurality of electrical conductors with at least one of the electrical conductors sheathed in at least one inner layer of a semi-conductive material, and at least one layer of an insulating material.
  • a jacket of elastomeric material surrounds the plurality of electrical conductors, and an outer metal armour covers the jacket of elastomeric material.
  • the semi-conductive material has electrical properties to reduce voltage stress between an outer surface of the electrical conductor and an inner surface of the insulating material.
  • the resulting cable has increased resistance to electrical failure when operating at 5 kV or more within a subterranean wellbore.
  • Figure 1 shows an elevational view of an ESP of the present invention within a wellbore.
  • Figure 2 shows a cross-sectional, perspective view of one preferred embodiment of a multiconductor electrical cable of the present invention.
  • the electrical cable of the present invention can be used in any situation where an electrical cable needs to be able to withstand relatively high temperatures, high pressures and corrosive fluids; however, it should be understood that the electrical cable of the present invention can also be used in less difficult applications.
  • high temperature means temperatures of greater than about 175 F and as high as about 500 F.
  • high pressure means pressures of at least 500 psi and as high as about 5,000 psi.
  • corrosive fluids means liquids and gases which can cause degradation to insulating materials and/or corrosion to the electrical conductors, such as liquids and/or gases containing hydrogen sulphide, carbon dioxide, water, and the like.
  • the present invention comprises a multiconductor electrical cable for use in a subterranean wellbore that has the capability of operating at greater than 5 kV without degradation of the insulation material.
  • the electrical cable comprises a plurality of electrical conductors, with at least one of the electrical conductors sheathed in at least one layer of a first material, and in at least one layer of a second material.
  • the first material has electrical properties to reduce voltage stress between an outer surface of the electrical conductor and an inner surface of the second material.
  • a jacket of elastomeric material surrounds the plurality of electrical conductors, and metal armour covers the jacket of elastomeric material.
  • FIG. 1 shows an electric submergible pumping system or "ESP" 10 set within a casing 12, which is cemented within a subterranean wellbore 14 that penetrates one or more subterranean earthen formations 16.
  • the ESP 10 comprises an electric motor 18, a motor protector 20, and a multi-stage pump 22 connected to production tubing 24.
  • An electrical cable 26 extends from a surface power source downwardly within the casing 12 and is operatively connected to the electric motor 18.
  • Figure 2 shows one preferred embodiment of the cable of the present invention, with the cable 26 having a plurality of electrical conductors 28.
  • electrical conductors 28 made from copper or copper alloys having a diameter or gauge thickness of from about 0.125 inch to about 0.500 inch, for typical wellbore applications. These conductors 28 may have a relatively thin coating of lead, tin or lead-tin alloy to aid in the prevention of corrosion of the copper, as is well known to those skilled in the art.
  • One or more ground wires 30 may be included, as well as other wires, conductors, conduits, fibre optics, and the like, as may be used to transmit fluids and/or information and command signals through the power cable 28.
  • At least one of the electrical conductors 28, and preferably all of the conductors, is sheathed in at least one inner layer of a semi-conducting material 32, and in at least one layer of a insulating material 34.
  • the semi-conductive material 32 reduces the voltage stress between an outer surface of the electrical conductor 28 and an inner surface ofthe insulating material 34.
  • the semi-conductive material 32 preferably has a volume resistivity of less than about 10 Kohm - meter, whereas the insulating material 34 preferably has a volume resistivity of greater than about 10 Kohm - meter.
  • the semi-conductive material 32 is used to prevent any voltage stress at surface irregularities of the conductor 28 and at voids between the conductor 28 and its insulating material 34.
  • the semi-conductive material 32 is selected from the group consisting of tapes and weaves of fibreglass, carbon fibre and aramid fibre, and tapes and one or more extruded layers of ethylene propylene copolymer, ethylene vinyl acrylate copolymer, ethylene ethyl acrylate copolymer, ethylene propylene diene methylene terpolymer, polychloroprene, polyolefin elastomer, and copolymers, mixtures, blends and alloys thereof.
  • the insulating material 34 is selected from the group consisting of one or more extruded layers of ethylene propylene diene methylene, ethylene propylene rubber, polychloroprene, fluroelastomers, polypropylenes, polyethylenes, polyethers, and copolymers, mixtures, blends and alloys thereof Most preferably, the insulating material 34 is ethylene propylene diene methylene.
  • Some electrical power cables used within wellbores include one or more longitudinal threads or ribbons of semi-conductive material, such as carbon-impregnated nylon, adjacent the outer metal armour to aid in dissipating static electricity buildup within the cable.
  • semi-conductive material such as carbon-impregnated nylon
  • These prior semi-conductive threads cannot be considered equivalent to the semi-conductive material 32 of the present invention because the prior semi-conductive threads were not placed adjacent the copper conductors 28 and, most importantly, the semi-conductive material 32 must form a complete sheath or covering of the conductors 28 in order to completely prevent any voltage stress at surface irregularities of the conductor 28 and at voids between the conductor 28 and its insulating material 34.
  • a jacket of elastomeric material 36 surrounds the plurality of electrical conductors 28 and is selected from the group consisting of nitrile rubber, ethylene propylene, ethylene propylene diene methylene terpolymer, polychloroprene, polyolefin elastomer, polyethylene, polypropylene, polyethylene, polyether, and copolymers, mixtures, blends and alloys thereof.
  • An outer metal armour 38 covers the jacket of elastomeric material 36, as is well known to those skilled in the art.
  • the cable 26 includes an optional insulation shield 40 between the insulating material 34 and the jacket of elastomeric material 36, and preferably is applied onto the insulating material 34.
  • the insulation shield 40 is used to confine the electrical field within the insulating material 34, and to symmetrically distribute the electrical stress within the insulating material 34.
  • the insulation shield 40 has a maximum volume resistivity of about 500 Kohm-meter.
  • the insulation shield 40 is selected from the group consisting of tapes and weaves of metal, such as lead, fibreglass, carbon fibre and aramid fibre, and tapes and/or one or more extruded layers of ethylene propylene copolymer, ethylene vinyl acrylate copolymer, ethylene ethyl acrylate copolymer, ethylene propylene diene methylene terpolymer, polychloroprene, polyolefin elastomer, and copolymers, mixtures, blends and alloys thereof.
  • metal such as lead, fibreglass, carbon fibre and aramid fibre
  • the cable 26 includes an optional fluid barrier 42 between the insulating material 34 and the jacket of elastomeric material 36, and preferably is applied to the insulation shield 40.
  • the fluid barrier 42 further protects the insulating materials 32, 34 and 40 and the conductors 28 from the deleterious effects of corrosive fluids, such as hydrocarbon gases and liquids, other gases, and most importantly, hydrogen sulphide.
  • the fluid barrier 42 is selected from the group consisting of tapes, films, weaves and one or more extruded layers of metal, such as lead, and fluropolymers, such as TEFLON.
  • the test results showed that the prior cable surpassed the ACBD criteria with a Weibull analysis showing a 63% probability of failure of 409 V/mil at 13.8 kV.
  • the new cable of the present invention also surpassed the ACBD criteria with a Weibull analysis showing a 63% probability of failure of 457 V/mil.
  • the prior cable did not consistently meet the 20 pC requirement at 6.9 kV, and had values ranging from 15 pC to 35 pC.
  • the new cable easily met the 20 pC requirement with values ranging from about 0 pC to about 2 pC.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)
  • Insulating Bodies (AREA)
  • Organic Insulating Materials (AREA)
EP98301355A 1997-05-19 1998-02-25 Câble électrique multiconducteur Withdrawn EP0880147A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85840897A 1997-05-19 1997-05-19
US858408 1997-05-19

Publications (1)

Publication Number Publication Date
EP0880147A1 true EP0880147A1 (fr) 1998-11-25

Family

ID=25328245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98301355A Withdrawn EP0880147A1 (fr) 1997-05-19 1998-02-25 Câble électrique multiconducteur

Country Status (3)

Country Link
EP (1) EP0880147A1 (fr)
CA (1) CA2238120A1 (fr)
NO (1) NO982217L (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7789689B2 (en) 2008-04-24 2010-09-07 Baker Hughes Incorporated Pothead for use in highly severe conditions
US8039747B2 (en) 2009-01-29 2011-10-18 Baker Hughes Incorporated High voltage electric submersible pump cable
US8581742B2 (en) 2000-03-30 2013-11-12 Baker Hughes Incorporated Bandwidth wireline data transmission system and method
WO2013173667A1 (fr) 2012-05-18 2013-11-21 Schlumberger Canada Limited Câbles électriques pour équipement d'ascension artificielle
CN104616807A (zh) * 2015-01-22 2015-05-13 安徽凌宇电缆科技有限公司 一种低烟无卤加强防水型柔性防火电缆
CN104681194A (zh) * 2015-01-30 2015-06-03 安徽省高沟电缆有限公司 一种工业用防水耐潮耐腐蚀电力电缆

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104078160A (zh) * 2013-03-29 2014-10-01 无锡市金正电缆有限公司 一种多芯交联聚乙烯绝缘铠装无卤低烟阻燃电力电缆

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3651244A (en) * 1969-10-15 1972-03-21 Gen Cable Corp Power cable with corrugated or smooth longitudinally folded metallic shielding tape
DE2504555A1 (de) * 1975-01-31 1976-08-05 Siemens Ag Flexible elektrische leitung
WO1982001785A1 (fr) * 1980-11-14 1982-05-27 Stubkjaer Jens E Cable de haute tension
GB2113453A (en) * 1982-01-07 1983-08-03 Electricity Council Electric power cable
US4398058A (en) * 1980-03-27 1983-08-09 Kabelmetal Electro Gmbh Moisture-proofing electrical cable

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3651244A (en) * 1969-10-15 1972-03-21 Gen Cable Corp Power cable with corrugated or smooth longitudinally folded metallic shielding tape
DE2504555A1 (de) * 1975-01-31 1976-08-05 Siemens Ag Flexible elektrische leitung
US4398058A (en) * 1980-03-27 1983-08-09 Kabelmetal Electro Gmbh Moisture-proofing electrical cable
WO1982001785A1 (fr) * 1980-11-14 1982-05-27 Stubkjaer Jens E Cable de haute tension
GB2113453A (en) * 1982-01-07 1983-08-03 Electricity Council Electric power cable

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8581742B2 (en) 2000-03-30 2013-11-12 Baker Hughes Incorporated Bandwidth wireline data transmission system and method
US7789689B2 (en) 2008-04-24 2010-09-07 Baker Hughes Incorporated Pothead for use in highly severe conditions
US8039747B2 (en) 2009-01-29 2011-10-18 Baker Hughes Incorporated High voltage electric submersible pump cable
WO2013173667A1 (fr) 2012-05-18 2013-11-21 Schlumberger Canada Limited Câbles électriques pour équipement d'ascension artificielle
EP2850620A1 (fr) * 2012-05-18 2015-03-25 Services Pétroliers Schlumberger Câbles électriques pour équipement d'ascension artificielle
EP2850620A4 (fr) * 2012-05-18 2015-04-29 Services Petroliers Schlumberger Câbles électriques pour équipement d'ascension artificielle
US9336929B2 (en) 2012-05-18 2016-05-10 Schlumberger Technology Corporation Artificial lift equipment power cables
CN104616807A (zh) * 2015-01-22 2015-05-13 安徽凌宇电缆科技有限公司 一种低烟无卤加强防水型柔性防火电缆
CN104681194A (zh) * 2015-01-30 2015-06-03 安徽省高沟电缆有限公司 一种工业用防水耐潮耐腐蚀电力电缆

Also Published As

Publication number Publication date
NO982217D0 (no) 1998-05-15
NO982217L (no) 1998-11-20
CA2238120A1 (fr) 1998-11-19

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