Patent US3274679A successfully refreshed from Google Patents.
Patent US3679812A successfully refreshed from Google Patents.
US3679812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical suspension cable for well tools
Assignee: Schlumberger Technology Corp
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Filing: 1970-11-13
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Granted: 1972-07-25
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Expires: 1990-11-13
Abstract
Abstract Representative embodiments are disclosed herein of new and improved armored electrical cables for supporting well tools in extra-deep well bores in which extreme geothermal temperatures may be encountered. To support the cable armor, the electrical conductors in these cables are enclosed within a tubular jacket which is formed of a helically wound metal strip having a rectangular cross section. In one embodiment of the invention, the individual electrical conductors are encased within thin-wall metal tubes and filled with a compacted powdered thermal and electrical insulating material for providing a suitable insulation capable of withstanding the most extreme temperatures which may be encountered. In another embodiment of the invention, the electrical conductors are sheathed in a special temperatureresistant plastic material to provide a cable for service at less extreme temperatures.
Inventors
- 👤 Nevyl G Owens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:50
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/04; H01B7/046; H01B7/17; H01B7/18; H01B7/22; H01B7/226; H01B7/29; H01B7/292
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
A suspension cable adapted for supporting a well tool in well bores in which extreme temperatures may be encountered and comprising: at least one electrical conductor; insulating means including a tubular sheath of a poly-m-carboranesiloxane polymer elastomeric material enclosing said electrical conductor and cooperatively arranged for electrically and thermally insulating said electrical conductor; an armor sheath coaxially enclosing said insulating means and said electrical conductor and including a plurality of first and second metal strands helically wound in opposite directions in relation to one another and cooperatively arranged for providing tightly wound concentric inner and outer layers of said metal strands adapted to carry tensile loads applied to said cable; and armor-supporting means coaxially arranged between said armor sheath and said insulating means and adapted for carrying inwardly directed loads imposed by tensioning of said armor sheath, said armor-supporting means including a tubular jacket formed of a helical coil of a rectangularly cross-sectioned metal strip tightly wound around said insulating means and compressively engaged therewith.
Claim 2
Dependent Claim
165 words
A suspension cable adapted for supporting a well tool in well bores in which extreme temperatures may be encountered and comprising: at least one electrical conductor; insulating means including a tubular sheath of a poly-m-carboranesiloxane polymer elastomeric material enclosing said electrical conductor and cooperatively arranged for electrically and thermally insulating said electrical conductor; an armor sheath coaxially enclosing said insulating means and said electrical conductor and including a plurality of first and second metal strands helically wound in opposite directions in relation to one another and cooperatively arranged for providing tightly wound concentric inner and outer layers of said metal strands adapted to carry tensile loads applied to said cable; and armor-supporting means coaxially arranged between said armor sheath and said insulating means and adapted for carrying inwardly directed loads imposed by tensioning of said armor sheath, said armor-supporting means including a tubular jacket formed of a helical coil of a rectangularly cross-sectioned metal strip tightly wound around said insulating means and compressively engaged therewith.
Claim 3
Dependent Claim
187 words
A suspension cable adapted for supporting a well tool in well bores in which extreme temperatures may be encountered and comprising: a plurality of electrical conductors; insulating means enclosing said electrical conductors and cooperatively arranged for electrically and thermally insulating said electrical conductors and including an elastomeric tubular sheath of poly-m-carboranesiloxane polymer coaxially disposed around each of said electrical conductors, said sheathed conductors being symmetrically grouped together and engaged with one another; an armor sheath coaxially enclosing said insulating means and said electrical conductors and including a plurality of first and second metal strands helically wound in oppositE directions in relation to one another around said tubular jacket for providing tightly wound concentric inner and outer layers of said metal strands adapted to carry tensile loads applied to said cable; and armor-supporting means coaxially arranged between said armor sheath and said insulating means and adapted for carrying inwardly directed loads imposed by tensioning of said armor sheath, said armor-supporting means including a tubular jacket formed of a helical coil of a rectangularly cross-sectioned metal strip tightly wound around said symmetrically grouped sheathed conductors and compressively engaged therewith.
Claim 4
Dependent Claim
187 words
A suspension cable adapted for supporting a well tool in well bores in which extreme temperatures may be encountered and comprising: a plurality of electrical conductors; insulating means enclosing said electrical conductors and cooperatively arranged for electrically and thermally insulating said electrical conductors and including an elastomeric tubular sheath of poly-m-carboranesiloxane polymer coaxially disposed around each of said electrical conductors, said sheathed conductors being symmetrically grouped together and engaged with one another; an armor sheath coaxially enclosing said insulating means and said electrical conductors and including a plurality of first and second metal strands helically wound in oppositE directions in relation to one another around said tubular jacket for providing tightly wound concentric inner and outer layers of said metal strands adapted to carry tensile loads applied to said cable; and armor-supporting means coaxially arranged between said armor sheath and said insulating means and adapted for carrying inwardly directed loads imposed by tensioning of said armor sheath, said armor-supporting means including a tubular jacket formed of a helical coil of a rectangularly cross-sectioned metal strip tightly wound around said symmetrically grouped sheathed conductors and compressively engaged therewith.
Claim 5
Dependent Claim
31 words
The cable of claim 2 wherein said symmetrically grouped sheathed conductors are twisted in a spiraling pattern about the longitudinal axis of said cable for accommodation of elongation of said cable.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |