IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0024305
(2004-12-28)
|
등록번호 |
US-7288721
(2007-10-30)
|
발명자
/ 주소 |
- Varkey,Joseph P.
- Kim,Byong Jun
- Wijnberg,Willem A.
- Arif,Faisal
- Singh,Anil
- Arnaud,Jeffrey
- Nguyen,John Cuong
|
출원인 / 주소 |
- Schlumberger Technology Corporation
|
인용정보 |
피인용 횟수 :
12 인용 특허 :
11 |
초록
▼
Disclosed are durable corrosion resistant wellbore electrical cables including a coated electrical conductor, a polymeric protective layer for trapping coating flakes, a first insulating jacket disposed adjacent to the polymeric protective layer and having a first relative permittivity. A second ins
Disclosed are durable corrosion resistant wellbore electrical cables including a coated electrical conductor, a polymeric protective layer for trapping coating flakes, a first insulating jacket disposed adjacent to the polymeric protective layer and having a first relative permittivity. A second insulating jacket is disposed adjacent to the first insulating jacket and has a second relative permittivity that is less than the first relative permittivity. Another aspect of the invention is a method for manufacturing a cable that includes providing a coated electrical conductor, extruding a polymeric protective layer over the coated electrical conductor, extruding a first insulating jacket over the protective polymeric layer, and extruding a second insulating jacket thereon. Cables of the invention may further include armor wire layers or even current return conductors.
대표청구항
▼
We claim: 1. A corrosion resistant wellbore cable comprising: (a) an electrical conductor comprising a central coated metallic conductor and a plurality of coated metallic conductors helically positioned around said central coated metallic conductor; (b) a coating flake trapping polymeric layer dis
We claim: 1. A corrosion resistant wellbore cable comprising: (a) an electrical conductor comprising a central coated metallic conductor and a plurality of coated metallic conductors helically positioned around said central coated metallic conductor; (b) a coating flake trapping polymeric layer disposed adjacent the electrical conductor; (c) a first insulating jacket disposed adjacent the polymeric layer wherein the first insulating jacket has a first relative permittivity; and (d) a second insulating jacket disposed adjacent the first insulating jacket and having a second relative permittivity that is less than the first relative permittivity, and wherein the first insulating jacket is mechanically bonded to the second insulating jacket; wherein the polymeric layer has a relative permittivity less than the first relative permittivity. 2. A cable according to claim 1 wherein said central metallic conductor is a coated copper conductor. 3. A cable according to claim 1 wherein said central and plurality of coated metallic conductors are nickel coated copper conductors. 4. A cable according to claim 1 wherein said polymeric layer includes a material selected from the group consisting of polyaryletherether ketone polymer, polyphenylene sulfide polymer, polyether ketone polymer, maleic anhydride modified polymers, Parmax짰 SRP polymers, copolymers of tetrafluoroethylene and ethylene, and any mixtures thereof. 5. A cable according to claim 4 wherein said polymeric layer material has a relative permittivity greater than 2.3. 6. A cable according to claim 1 wherein said first insulating jacket comprises a dielectric material selected from the group consisting of polyaryletherether ketone polymer, polyphenylene sulfide polymer, polyether ketone polymer, maleic anhydride modified polymers, Parmax짰 SRP polymers, copolymers of tetrafluoroethylene and ethylene, and any mixtures thereof. 7. A cable according to claim 1 wherein said first insulating jacket comprises a fluoropolymer additive. 8. A cable according to claim 7, wherein said fluoropolymer additive is incorporated in the amount of about 5% or less by weight based upon total weight of said first insulating jacket. 9. A cable according to claim 1, wherein said first relative permittivity is within a range of about 2.5 to about 10. 10. A cable according to claim 1, wherein a thickness of said polymeric layer between said first insulating jacket and the outer surface of said electrical conductor is within a range from about 1 micrometer to about 153 micrometers. 11. A cable according to claim 1, wherein a thickness of the first insulating jacket is within a range of from about 10 micrometers to about 153 micrometers. 12. A cable according to claim 1, wherein the second relative permittivity is within a range of about 1.8 to about 5.0. 13. A cable according to claim 1, wherein the second insulating jacket is made of a material selected from the group consisting of polytetrafluoroethylene-perfluoromethylvinylether polymer, perfluoro-alkozyalkane polymer, polytetrafluoroethylene polymer, ethylene-tetrafluoroethylene polymer, ethylene-propylene copolymer, polyethylene, poly(4-methyl-1-pentene) polyolefin, and fluoropolymer. 14. A cable according to claim 1, further comprising: an outer jacket surrounding the second insulating jacket, and an interstitial filler disposed between the outer jacket and the second insulating jacket. 15. A cable according to claim 14, further comprising an armor wire layer surrounding the outer jacket. 16. A cable according to claim 15 wherein said armor wire layer comprises at least one current return conductor. 17. A cable according to claim 14, wherein the outer jacket is made from a material selected from the group consisting of the polyaryletherether ketone family of polymers, ethylene tetrafluoroethylene copolymer, fluoropolymer, and polyolefin. 18. A cable according to claim 14, wherein the interstitial filler is made from a material selected from the group consisting of perfluoropolyether polymers, perfluoropolyether-silicone polymers, grease, fluoropolymers, and any mixtures thereof. 19. A cable according to claim 14 further comprising at least one drain wire disposed within said outer jacket. 20. A cable according to claim 1, wherein a capacitance of the electrical conductor in combination with the first insulating jacket and the second insulating jacket is within the range of from about 98 picofarads per meter to about 230 picofarads per meter. 21. A cable according to claim 1 further comprising at least one current return conductor. 22. A cable according to claim 21 wherein said current return conductor is a nickel coated copper conductors. 23. A corrosion resistant wellbore cable comprising: (a) a plurality of insulated electrical conductors, each of said conductors comprising: (i) a central coated metallic conductor and a plurality of coated metallic conductors helically positioned around said central coated metallic conductor; (ii) a coating flake trapping polymeric layer disposed adjacent the electrical conductor; (iii) a first insulating jacket disposed adjacent the polymeric layer wherein the first insulating jacket has a first relative permittivity; and, (iv) a second insulating jacket disposed adjacent the first insulating jacket and having a second relative permittivity that is less than the first relative permittivity, and wherein the first insulating jacket is mechanically bonded to the second insulating jacket; wherein the polymeric layer has a relative permittivity less than the first relative permittivity; (b) an outer jacket surrounding said plurality of said insulated electrical conductors, and an interstitial filler disposed between the outer jacket and said insulated electrical conductors, wherein the interstitial filler is made from a material selected from the group consisting of perfluoropolyether polymers, perfluoropolyether-silicone polymers, Krytox짰 grease, fluoropolymers, and any mixtures thereof; (c) a plurality of current return conductors disposed between the outer jacket and said insulated electrical conductors; and, (d) at least one armor wire layer surrounding the outer jacket. 24. A cable according to claim 23 which is a hepta-cable, or quad-cable design. 25. A corrosion resistant wellbore cable comprising: (a) a plurality of insulated electrical conductors, each of said conductors comprising: (i) a central coated metallic conductor and a plurality of coated metallic conductors helically positioned around said central coated metallic conductor; (ii) a coating flake trapping polymeric layer disposed adjacent the electrical conductor; (iii) a first insulating jacket disposed adjacent the polymeric layer wherein the first insulating jacket has a first relative permittivity; and, (iv) a second insulating jacket disposed adjacent the first insulating jacket and having a second relative permittivity that is less than the first relative permittivity, and wherein the first insulating jacket is mechanically bonded to the second insulating jacket; wherein the polymeric layer has a relative permittivity less than the first relative permittivity; (b) an outer jacket surrounding said plurality of said insulated electrical conductors, and an interstitial filler disposed between the outer jacket and said insulated electrical conductors; (c) at least one armor wire layer surrounding the jacket which further comprises at least one current return conductor disposed about the armor wire layer. 26. A method of providing a corrosion resistant wellbore electrical cable with improved durability, the method comprising: (a) providing at least one coated electrical conductor; (b) extruding a coating flake trapping polymeric layer over the electrical conductor, the polymeric layer comprising coating flakes produced during manufacture of the cable; (c) extruding a first insulating jacket having a first relative permittivity over the polymeric layer; and (d) extruding a second insulating jacket having a second relative permittivity over the first insulating jacket, wherein the second relative permittivity is less than the first relative permittivity; wherein the polymeric layer has a relative permittivity less than the first relative permittivity. 27. A method according to claim 26, wherein extruding the first insulating jacket further comprises compression. 28. A method according to claim 27, wherein extruding the second insulating jacket further comprises extruding the second insulating jacket by a method selected from the group consisting of tubing extrusion, compression extrusion, and semi-compression extrusion. 29. A method according to claim 26, wherein extruding the second insulating jacket further comprises extruding the second insulating jacket such that the second insulating jacket is mechanically bonded to the first insulating jacket. 30. A method according to claim 26, wherein extruding the second insulating jacket further comprises extruding the second insulating jacket such that the second insulating jacket is chemically bonded to the first insulating jacket. 31. A method according to claim 26, wherein the first insulating jacket and the second insulating jacket are separately extruded by tandem extrusion.
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