US3781456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sealed cable packoff and method for making and using same
Assignee: Atlantic Richfield Co
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Filing: 1972-08-01
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Granted: 1973-12-25
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Expires: 1992-08-01
Abstract
Abstract Apparatus for feeding a multi-conductor cable through a wall separating two environmental zones, such as pressure zones of a Christmas tree of a wellhead, includes a hollow body inserted through the wall separating the zones. The hollow body is filled with epoxy and a pressurized packing material forced into noncontacting interfaces between the epoxy and the hollow body. Conductor spacers are provided in one embodiment to prevent the conductors of the cable from shorting. Also presented is a method for achieving a seal in effecting a cable feedthrough from one environmental zone to another including running the cable through an enclosure defining body, removing the insulation from the wires within the enclosure, filling the enclosure with a hardening cement or resin, such as epoxy, exposing the enclosure to a fluid under pressure, and injecting, under a higher pressure, a packing material into the nonjoined interfaces between the epoxy and the walls of the enclosure.
Inventors
- 👤 C Knowles
- 👤 D Ruckel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:42
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/0407; H; H01; H01B; H01B17/00; H01B17/26; H01B17/30; H01B17/303; H01B17/306
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
Apparatus for conducting a multiconductor cable through a wall between environmental zones, comprising: a multi-conductor cable, said cable being stripped of insulation along a length to expose the conductors of said cable, a sleeve having a closed bottom and open top, the closed bottom having a hole therethrough receiving the cable, a top member engaging the open top of said sleeve to define an enclosed chamber within the walls and bottom of said sleeve, said top member having a hole therethrough receiving the cable, a first packing material within the enclosed chamber contacting the exposed conductors of said cable, a second packing material under pressure in areas between said first packing material and said sleeve and said top member.
Claim 2
Dependent Claim
119 words
Apparatus for conducting a multiconductor cable through a wall between environmental zones, comprising: a multi-conductor cable, said cable being stripped of insulation along a length to expose the conductors of said cable, a sleeve having a closed bottom and open top, the closed bottom having a hole therethrough receiving the cable, a top member engaging the open top of said sleeve to define an enclosed chamber within the walls and bottom of said sleeve, said top member having a hole therethrough receiving the cable, a first packing material within the enclosed chamber contacting the exposed conductors of said cable, a second packing material under pressure in areas between said first packing material and said sleeve and said top member.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said sleeve and top member are of 4140 steel.
Claim 4
Dependent Claim
22 words
The apparatus of claim 1 wherein said sleeve has a plurality of channels along an interior wall thereof within the enclosed chamber.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1 wherein said first packing material is epoxy and said second packing material is a grease.
Claim 6
Dependent Claim
22 words
The apparatus of claim 4 further comprising a grease fitting extending through a wall of said sleeve to within the enclosed chamber.
Claim 7
Dependent Claim
23 words
The apparatus of claim 1 further comprising means within the enclosed chamber holding the conductors of the cable spaced apart from each other.
Claim 8
Dependent Claim
50 words
The apparatus of claim 6 wherein said means for holding the conductors comprises two boards each having a plurality of holes through which the conductors of the cable are positioned, and wherein said sleeve comprises two shoulders within the enclosed chamber on which each of said boards respectively is carried.
Claim 9
Independent Claim
143 words
A method for feeding a multi-conductor cable having insulation covered conductors within an outer casinG through a wall between environmental zones comprising, removing the outer casing along a length of the cable, removing the insulation from conductors of the cable along the length of the cable within the length from which the outer casing is removed, locating the cable with the conductors disposed within a sleeve defining an enclosure mountable to the wall, whereby the cable will run between the pressure zones when the sleeve is mounted to the wall, inserting a first packing material within the enclosure to contact the conductors from which the insulation has been removed, subjecting the sleeve defined enclosure to a first pressure, injecting a second packing material under pressure higher than said first pressure to areas between the first packing material and the walls of the enclosure.
Claim 10
Independent Claim
143 words
A method for feeding a multi-conductor cable having insulation covered conductors within an outer casinG through a wall between environmental zones comprising, removing the outer casing along a length of the cable, removing the insulation from conductors of the cable along the length of the cable within the length from which the outer casing is removed, locating the cable with the conductors disposed within a sleeve defining an enclosure mountable to the wall, whereby the cable will run between the pressure zones when the sleeve is mounted to the wall, inserting a first packing material within the enclosure to contact the conductors from which the insulation has been removed, subjecting the sleeve defined enclosure to a first pressure, injecting a second packing material under pressure higher than said first pressure to areas between the first packing material and the walls of the enclosure.
Claim 11
Dependent Claim
30 words
The method of claim 8 further comprising disposing at least one conductor separating element within the enclosure to prevent the cables from which the insulation has been removed from shorting.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |