EP0880147A1 - Multiconductor electrical cable - Google Patents
Multiconductor electrical cable Download PDFInfo
- 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
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- European Patent Office
- Prior art keywords
- ethylene propylene
- jacket
- electrical
- tapes
- electrical cable
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- 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.)
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- 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
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- 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
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- 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.
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Insulated Conductors (AREA)
- Insulating Bodies (AREA)
- Organic Insulating Materials (AREA)
Abstract
A multiconductor electrical cable for use in a subterranean wellbore comprises
a plurality of electrical conductors (28) with at least one of the electrical conductors
sheathed in at least one inner layer (32) of a semi-conductive material, and at least one
layer (34) of an insulating material. A jacket (36) of elastomeric material surrounds the
plurality of electrical conductors, and an outer metal armour (38) covers the jacket of
elastomeric material. The semi-conductive material (32) has electrical properties to
reduce voltage stress between an outer surface of the electrical conductor (28) and an
inner surface ofthe insulating material (34). The resulting cable has increased resistance
to electrical failure when operating at voltages of about 8 kV or more within a
subterranean wellbore.
Description
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, such as
electrical submergible pumping systems, must be capable of withstanding the high
temperatures, high pressures and/or corrosive fluids often encountered within
subterranean wellbores. As used herein, the term "high temperature" means
temperatures of greater than about 175 F and as high as about 500 F. The term "high
pressure" means pressures of at least 500 psi and as high as about 5,000 psi. Further,
the term "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.
Existing wellbore power cables are capable of operating in these wellbore
conditions if operated at or below about 5 kV (phase to phase operation). Newer pump
motors are being designed to operate efficiently at higher voltages. Yet, if these existing
wellbore power cables are operated above 5 kV, the electrical fields generated within the
power cable cause extreme stress at the micro-interfaces of contact and voids between
the electrical conductors and the insulating material. This stress causes a rapid
deterioration of the insulating material which directly and quickly leads to electrical
shorting and failure ofthe power cable. Once a power cable fails, the fluid production
from the wellbore is ceased, resulting in lost revenue to the operator. In addition,
expensive and time consuming cable retrieval, repair and re-installation procedures must
be undertaken.
Many power cables for use in surface applications have power ratings far in
excess of 5 kV; however, these power cables do not have the type of insulations to
withstand the high temperature, high pressure and corrosive environments within a
subterranean wellbore. There is a need for a multiconductor power cable for use in
subterranean wellbores that can successfully be operated above 5 kV.
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. As used herein,
the term "high temperature" means temperatures of greater than about 175 F and as high
as about 500 F. The term "high pressure" means pressures of at least 500 psi and as
high as about 5,000 psi. Further, the term "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. As described above, 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.
To better understand the present invention, reference is made to the
accompanying drawings. Figure 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. There are three
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. For this purpose, 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. Whereas, 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. 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.
As shown in Figure 2, 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. Preferably, 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.
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.
To prove the efficacy ofthe addition of the layer of semi-conductive material 32,
tests were conducted on samples of a prior cable without the semi-conductive material
32 and on samples of the cable ofthe present invention. The principle tests to determine
the suitability of a power cable for a particular voltage application are AC breakdown
strength (ACBD) and partial discharge (PD or corona) performance. According to IEC
502, for a cable to pass these tests the cable must withstand 3.0 Uo test voltage or about
13.8 kV phase to ground test voltage for the ACBD of more than 50 V/mil, and to have
less than 20 pC at 1.5 Uo or about 6.9 kV phase to ground test voltage for the PD.
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. As for the PD tests, 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. On the other hand, the new cable easily met the 20 pC
requirement with values ranging from about 0 pC to about 2 pC.
Whereas the present invention has been described in particular relation to the
drawings attached hereto, it should be understood that other and further modifications,
apart from those shown or suggested herein, may be made within the scope of the
present invention as defined by the claims.
Claims (19)
- A multiconductor electrical cable for use in a subterranean wellbore, comprising: a plurality of electrical conductors; at least one of the electrical conductors sheathed in at least one inner layer of a semi-conductive material, and in at least one layer of an insulating material; and a jacket of elastomeric material surrounding the plurality of electrical conductors.
- A multiconductor electrical cable of Claim 1, wherein the semi-conductive material has a volume resistivity of less than about 10 Kohm - meter.
- A multiconductor electrical cable of Claim 1 or Claim 2, wherein the semi-conductive material is selected from the group consisting of tapes and weaves of 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.
- A multiconductor electrical cable of any of the preceding claims, wherein the insulating material 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.
- A multiconductor electrical cable of Claim 4, wherein the insulating material is ethylene propylene diene methylene.
- A multiconductor electrical cable of any of the preceding claims, wherein the jacket of elastomeric material surrounding the plurality of electrical conductors 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.
- A multiconductor electrical cable of any of the preceding claims, and further comprising shield means between the insulating material and the jacket of elastomeric material for confining an electrical field within the insulating material.
- A multiconductor electrical cable of any of the preceding claims, and further comprising shield means between the insulating material and the jacket of elastomeric material for symmetrically distributing electrical stress within the non-conductive insulating material.
- A multiconductor electrical cable of any of the preceding claims, and further comprising an insulation shield between the insulating material and the jacket of elastomeric material, the insulation shield is selected from the group consisting of tapes and weaves of metal, fibreglass, carbon fibre and aramid fibre, and tapes and/or one or more extruded layers of ethylene propylene copolymer, ethylene propylene diene methylene terpolymer, polychloroprene, polyolefin elastomer, and copolymers, mixtures, blends and alloys thereof.
- A multiconductor electrical cable of any of the preceding claims, and further comprising an insulation shield between the insulating material and the jacket of elastomeric material, the insulation shield having a maximum volume resistivity of about 500 Kohm-meter.
- A multiconductor electrical cable of Claim 9, and further comprising a fluid barrier between the insulation shield and the jacket of elastomeric material, the fluid barrier is selected from the group consisting of tapes, films, weaves and one or more extruded layers of metal and fluropolymers.
- A multiconductor electrical cable for use in a subterranean wellbore, comprising: a plurality of electrical conductors; at least one of the electrical conductors sheathed in at least one inner layer of a first material, and in at least one layer of a second material; the first material having a volume resistivity of less than about 10 Kohm-meter, and the second material having a volume resistivity of greater than about 10 Kohm-meter; and a jacket of elastomeric material surrounding the plurality of electrical conductors.
- A multiconductor electrical cable of Claim 12 and further comprising insulation shield means between the second material and the jacket of elastomeric material for confining an electrical field within the second material.
- A multiconductor electrical cable for use in a subterranean wellbore, comprising: a plurality of electrical conductors; at least one of the electrical conductors sheathed in at least one layer of a first material, and in at least one layer of an insulating material; the first material having electrical properties to reduce voltage stress between an outer surface ofthe electrical conductor and an inner surface ofthe insulating material; and a jacket of elastomeric material surrounding the plurality of electrical conductors.
- A multiconductor electrical cable of Claim 14 and further comprising shield means between the insulating material and the jacket of elastomeric material for confining an electrical field within the insulating material.
- A multiconductor electrical cable for use in a subterranean wellbore, comprising: a plurality of electrical conductors; at least one of the electrical conductors sheathed in at least one layer of a first material, and in at least one layer of an insulating material; the first material is selected from the group consisting of tapes and weaves of 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. the second material 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; and a jacket of elastomeric material surrounding the plurality of electrical conductors 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.
- A multiconductor electrical cable of Claim 16 and further comprising an insulation shield adjacent the second material, the insulation shield is selected from the group consisting of tapes and weaves of metal, fibreglass, carbon fibre and aramid fibre, and tapes and one or more extruded layers of ethylene propylene copolymer, ethylene propylene diene methylene terpolymer, polychloroprene, polyolefin elastomer, and copolymers, mixtures, blends and alloys thereof.
- A multiconductor electrical cable of Claim 17 and further comprising a fluid barrier adjacent the insulation shield, the fluid barrier is selected from the group consisting of tapes, films, weaves and one or more extruded layers of metal and fluropolymers.
- A multiconductor electrical cable for use in a subterranean wellbore, comprising: a plurality of electrical conductors with at least one of the electrical conductors sheathed in one or more layers of a first material selected from the group consisting of tapes and weaves of 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; a second material 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; an insulation shield selected from the group consisting of tapes and weaves of metal, fibreglass, carbon fibre and aramid fibre, and tapes and one or more extruded layers of ethylene propylene copolymer, ethylene propylene diene methylene terpolymer, polychloroprene, polyolefin elastomer, and copolymers, mixtures, blends and alloys thereof; and a fluid barrier selected from the group consisting of tapes, films, weaves and one or more extruded layers of metal and fluropolymers; a jacket of elastomeric material surrounding the plurality of electrical conductors selected from the group consisting of nitrile rubber, ethylene propylene, ethylene propylene diene methylene terpolymer, polychloroprene, polyolefin elastomer, polyethylenes, polypropylenes, polyethylenes, polyethers, and copolymers, mixtures, blends and alloys thereof; and metal armour covering the jacket of elastomeric material.
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 (en) | 1998-11-25 |
Family
ID=25328245
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98301355A Withdrawn EP0880147A1 (en) | 1997-05-19 | 1998-02-25 | Multiconductor electrical cable |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0880147A1 (en) |
CA (1) | CA2238120A1 (en) |
NO (1) | NO982217L (en) |
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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 (en) | 2012-05-18 | 2013-11-21 | Schlumberger Canada Limited | Artificial lift equipment power cables |
CN104616807A (en) * | 2015-01-22 | 2015-05-13 | 安徽凌宇电缆科技有限公司 | Low-smoke zero-halogen reinforced waterproof flexible fire-proof cable |
CN104681194A (en) * | 2015-01-30 | 2015-06-03 | 安徽省高沟电缆有限公司 | Industrial waterproof moistureproof corrosion-resistant power cable |
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CN104078160A (en) * | 2013-03-29 | 2014-10-01 | 无锡市金正电缆有限公司 | Multi-core cross linked polyethylene insulated armor halogen-free low-smoke inflaming retarding power cable |
Citations (5)
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 (en) * | 1975-01-31 | 1976-08-05 | Siemens Ag | Multi conductor flexible electrical lead for mobile appliances - with improved frictional relationship between conductors |
WO1982001785A1 (en) * | 1980-11-14 | 1982-05-27 | Stubkjaer Jens E | High voltage cable |
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 |
-
1998
- 1998-02-25 EP EP98301355A patent/EP0880147A1/en not_active Withdrawn
- 1998-05-15 CA CA 2238120 patent/CA2238120A1/en not_active Abandoned
- 1998-05-15 NO NO982217A patent/NO982217L/en unknown
Patent Citations (5)
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 (en) * | 1975-01-31 | 1976-08-05 | Siemens Ag | Multi conductor flexible electrical lead for mobile appliances - with improved frictional relationship between conductors |
US4398058A (en) * | 1980-03-27 | 1983-08-09 | Kabelmetal Electro Gmbh | Moisture-proofing electrical cable |
WO1982001785A1 (en) * | 1980-11-14 | 1982-05-27 | Stubkjaer Jens E | High voltage cable |
GB2113453A (en) * | 1982-01-07 | 1983-08-03 | Electricity Council | Electric power cable |
Cited By (9)
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 (en) | 2012-05-18 | 2013-11-21 | Schlumberger Canada Limited | Artificial lift equipment power cables |
EP2850620A1 (en) * | 2012-05-18 | 2015-03-25 | Services Pétroliers Schlumberger | Artificial lift equipment power cables |
EP2850620A4 (en) * | 2012-05-18 | 2015-04-29 | Services Petroliers Schlumberger | Artificial lift equipment power cables |
US9336929B2 (en) | 2012-05-18 | 2016-05-10 | Schlumberger Technology Corporation | Artificial lift equipment power cables |
CN104616807A (en) * | 2015-01-22 | 2015-05-13 | 安徽凌宇电缆科技有限公司 | Low-smoke zero-halogen reinforced waterproof flexible fire-proof cable |
CN104681194A (en) * | 2015-01-30 | 2015-06-03 | 安徽省高沟电缆有限公司 | Industrial waterproof moistureproof corrosion-resistant power cable |
Also Published As
Publication number | Publication date |
---|---|
NO982217L (en) | 1998-11-20 |
CA2238120A1 (en) | 1998-11-19 |
NO982217D0 (en) | 1998-05-15 |
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