US3636875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaped charge devices for wire carriers
Assignee: Schlumberger Technology Corp
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Filing: 1970-06-29
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Granted: 1972-01-25
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Expires: 1990-06-29
Abstract
Abstract The particular embodiments described herein to illustrate the invention include encapsulated shaped charge devices having highstrength ceramic cases which are mounted on a wire carrier for movement into a well bore in which a perforating operation is to be conducted. As is typical, the wire carrier is comprised of a pair of paralleled rods or laterally spaced wire members respectively having spaced reversely curved portions and cooperatively arranged in relation to the other wire for defining a series of enlarged openings along the carrier which are respectively adapted for receiving an encapsulated shaped charge. To secure the shaped charges to the wire carrier, a lead band arranged around each charge case is provided with a pair of outstanding lugs respectively projecting outwardly from each side of the case and adapted to engage only a small portion of the rear face of each of the two carrier wires. In one embodiment of the invention, the forward faces of the two carrier wires are engaged against the rear of a circumferential flange formed around the ceramic case. In an alternative embodiment of the invention, one or more outstanding lugs are formed on each side of the lead band and spaced forwardly of the first-mentioned single lugs a distance corresponding generally to the thickness of the carrier wires. In either situation, upon detonation of the shaped charges, the lead bands will protect the carrier wires from laterally directed explosive forces and, by virtue of having only the single outstanding lugs in engagement with the rear face of each carrier wire, these rearward outstanding lugs will readily fail so as to prevent the forwardly directed explosive forces from twisting the carrier wires about their respective longitudinal axes which otherwise frequently causes failure of the wires at one or more points along their lengths.
Inventors
- 👤 A C Dodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:07
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/08; E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
179 words
Perforating apparatus comprising: a support adapted for suspension in a well bore and including first and second generally paralleled elongated wire members spaced apart from one another and lying in a common longitudinal plane; an encapsulated shaped charge explosive device positioned between said wire members and adapted for firing along a perforating axis intersecting said longitudinal plane and extending in a forward direction therefrom; means for holding said wire members in their said generally parallel spaced relation and including fastening means coupling said wire members to one another above and below said shaped charge device; and means for retaining said shaped charge device between said wire members and including first and second outstanding yieldable lugs secured on opposite sides of said shaped charge device and respectively engaged with the rear surfaces of said first and second wire members, said lugs being operatively sized and arranged to yield upon firing of said shaped charge device to at least minimize forwardly directed explosive forces acting on said wire members and tending to twist said wire members about their respective longitudinal axes.
Claim 2
Dependent Claim
179 words
Perforating apparatus comprising: a support adapted for suspension in a well bore and including first and second generally paralleled elongated wire members spaced apart from one another and lying in a common longitudinal plane; an encapsulated shaped charge explosive device positioned between said wire members and adapted for firing along a perforating axis intersecting said longitudinal plane and extending in a forward direction therefrom; means for holding said wire members in their said generally parallel spaced relation and including fastening means coupling said wire members to one another above and below said shaped charge device; and means for retaining said shaped charge device between said wire members and including first and second outstanding yieldable lugs secured on opposite sides of said shaped charge device and respectively engaged with the rear surfaces of said first and second wire members, said lugs being operatively sized and arranged to yield upon firing of said shaped charge device to at least minimize forwardly directed explosive forces acting on said wire members and tending to twist said wire members about their respective longitudinal axes.
Claim 3
Dependent Claim
58 words
The perforating apparatus of claim 1 wherein said retaining means further include a lead band secured around said shaped charge device and engaged with the opposed inwardly directed surfaces of said wire members to at least minimize laterally directed explosive forces acting on said wire members, said first and second lugs being formed integrally with said lead band.
Claim 4
Dependent Claim
60 words
The perforating apparatus of claim 2 wherein said retaining means further include third and fourth outstanding lugs formed integrally with said lead band on opposite sides of said shaped charge device and respectively engaged with the forward surfaces of said first and second wire members to prevent rearward movement of said shaped charge device in relation to said wire members.
Claim 5
Dependent Claim
59 words
The perforating apparatus of claim 2 wherein said retaining means further include means on said shaped charge device defining diametrically opposed shoulders on opposite sides of said shaped charge device and respectively engaged with the forward surfaces of said first and second wire members to prevent rearward movement of said shaped charge device in relation to said wire members.
Claim 6
Dependent Claim
292 words
Perforating apparatus comprising: a support adapted for suspension in a well bore and including first and second wire members having alternately occurring inwardly directed curved portions and outwardly directed curved portions along their respective lengths, said wire members being arranged in a common longitudinal plane along generally parallel longitudinal axes and oriented to position their respective inwardly curved portions adjacent to one another and to position their respective outwardly curved portions opposite to one another to define a plurality of longitudinally spaced generally oval openings between said wire members; a plurality of encapsulated shaped charge explosive devices respectively positioned in each of said generally oval openings, each of said shaped charge devices being adapted for firing in a selected forward direction along a perforating axis intersecting said longitudinal plane; means for holding said wire members in their said spaced relation and including fastening means coupling said inwardly curved portions of said wire members to one another; and means for retaining said shaped charge devices between said wire members and including a lead band secured around each of said shaped charge devices and engaged with the opposed inwardly directed surfaces of said outwardly curved portions to at least minimize laterally directed explosive forces acting on said wire members, and first and second diametrically opposed lateral lugs on said lead band projecting outwardly therefrom along the rear surfaces of said first and second wire members and being the sole means retaining said shaped charge device against movement forwardly in relation to said wire members, said lateral lugs being selectively sized to yield upon firing of said shaped charge device to at least minimize forwardly directed explosive forces acting on said wire members and tending to twist said wire members about their respective longitudinal axes.
Claim 7
Dependent Claim
292 words
Perforating apparatus comprising: a support adapted for suspension in a well bore and including first and second wire members having alternately occurring inwardly directed curved portions and outwardly directed curved portions along their respective lengths, said wire members being arranged in a common longitudinal plane along generally parallel longitudinal axes and oriented to position their respective inwardly curved portions adjacent to one another and to position their respective outwardly curved portions opposite to one another to define a plurality of longitudinally spaced generally oval openings between said wire members; a plurality of encapsulated shaped charge explosive devices respectively positioned in each of said generally oval openings, each of said shaped charge devices being adapted for firing in a selected forward direction along a perforating axis intersecting said longitudinal plane; means for holding said wire members in their said spaced relation and including fastening means coupling said inwardly curved portions of said wire members to one another; and means for retaining said shaped charge devices between said wire members and including a lead band secured around each of said shaped charge devices and engaged with the opposed inwardly directed surfaces of said outwardly curved portions to at least minimize laterally directed explosive forces acting on said wire members, and first and second diametrically opposed lateral lugs on said lead band projecting outwardly therefrom along the rear surfaces of said first and second wire members and being the sole means retaining said shaped charge device against movement forwardly in relation to said wire members, said lateral lugs being selectively sized to yield upon firing of said shaped charge device to at least minimize forwardly directed explosive forces acting on said wire members and tending to twist said wire members about their respective longitudinal axes.
Claim 8
Dependent Claim
66 words
The perforating apparatus of claim 5 wherein said retaining means on each of said shaped charge devices further include means on said shaped charge device defining diametrically opposed shoulders on opposite sides of said shaped charge device and respectively engaged with the forward surfaces of said first and second wire members to prevent rearward movement of said shaped charge device in relation to said wire members.
Claim 9
Dependent Claim
60 words
The perforating apparatus of claim 5 wherein said retaining means further include third and forth outstanding lugs formed integrally with said lead band on opposite sides of said shaped charge device and respectively engaged with the forward surfaces of said first and second wire members to prevent rearward movement of said shaped charge device in relation to said wire members.
Claim 10
Dependent Claim
135 words
A well-perforating device comprising: a hollow case of a ceramic or other glasslike material; shaped charge means in said case; a lead band secured around the midportion of said case; and means adapted for mounting said case between a pair of spaced wire-supporting members and including only a single integral lug extending laterally outwardly from said lead band on each side of said case and respectively adapted to be engaged with the rearward surfaces of such wire members to be the sole means retaining said perforating device against forward movement in relation to such wire members, said integral lugs being selectively sized to yield upon firing of said perforating device to at least minimize forwardly directed explosive forces acting on such wire members and tending to twist such wire members about their respective longitudinal axes.
Claim 11
Dependent Claim
135 words
A well-perforating device comprising: a hollow case of a ceramic or other glasslike material; shaped charge means in said case; a lead band secured around the midportion of said case; and means adapted for mounting said case between a pair of spaced wire-supporting members and including only a single integral lug extending laterally outwardly from said lead band on each side of said case and respectively adapted to be engaged with the rearward surfaces of such wire members to be the sole means retaining said perforating device against forward movement in relation to such wire members, said integral lugs being selectively sized to yield upon firing of said perforating device to at least minimize forwardly directed explosive forces acting on such wire members and tending to twist such wire members about their respective longitudinal axes.
Claim 12
Dependent Claim
56 words
The well-perforating device of claim 8 wherein said mounting means further include integral shoulders on opposite sides of said lead band ahead of each of said integral lugs and respectively adapted to be engaged with the forward surfaces of such wire members to retain said perforating device against rearward movement in relation to such wire members.
Claim 13
Dependent Claim
66 words
The well-perforating device of claim 8 wherein said mounting means further include integral shoulders on said case ahead of said lead band and on opposite sides of said case in front of said integral lugs, said integral shoulders being respectively adapted to be engaged with the forward surfaces of such wire members to retain said perforating device against rearward movement in relation to such wire members.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |