US3734018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosive assembly for restoring damaged casing
Assignee: Jet Research Center Inc
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Filing: 1971-07-26
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Granted: 1973-05-22
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Expires: 1991-07-26
Abstract
Abstract Disclosed herein is an explosive assembly for restoring collapsed or otherwise damaged oil well casing to its original shape. The assembly includes one or more elongated housings having shaped explosive charges within a carrier therefor and detonating components.
Inventors
- 👤 E Gillingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:58
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/10; E21B29/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
An explosive charge assembly for straightening collapsed or bent casing which comprises a center support member; a plurality of elongated housing members having explosive charges therein; means for flexible attachment of said housing members to and around said support member to permit flexible change in diameter of said explosive charge assembly, said housing members normally being spaced from and parallel to said support member; and detonating means for detonating said explosive charges.
Claim 2
Dependent Claim
72 words
An explosive charge assembly for straightening collapsed or bent casing which comprises a center support member; a plurality of elongated housing members having explosive charges therein; means for flexible attachment of said housing members to and around said support member to permit flexible change in diameter of said explosive charge assembly, said housing members normally being spaced from and parallel to said support member; and detonating means for detonating said explosive charges.
Claim 3
Dependent Claim
14 words
The explosive charge assembly of claim 1 wherein said explosive charges are shaped charges.
Claim 4
Dependent Claim
18 words
The explosive charge assembly of claim 1 wherein said housing members are movably attached to said support member.
Claim 5
Dependent Claim
174 words
An explosive charge assembly for straightening collapsed or bent casing, which comprises an elongated, rigid center support member; an upper ring attached to said support member for slidable adjustment thereon; a lower ring fixedly attached to said support member below said upper ring; a plurality of housing members flexibly attached parallel to and at a distance from said support member by flexible attachment means, said flexible attachment means comprising a plurality of flexible upper members and a plurality of flexible lower members; said flexible upper members having one end of each fixed to said upper ring and the other end of each fixed to the upper end of one of said housing members and said flexible lower members having one end of each fixed to said lower ring and the other end of each fixed to the lower end of one of said housing members; said explosive charge assembly further comprising a plurality of elongated explosive shaped charges, each positioned in one of said housing members; and detonating means for detonating said shaped charges.
Claim 6
Dependent Claim
174 words
An explosive charge assembly for straightening collapsed or bent casing, which comprises an elongated, rigid center support member; an upper ring attached to said support member for slidable adjustment thereon; a lower ring fixedly attached to said support member below said upper ring; a plurality of housing members flexibly attached parallel to and at a distance from said support member by flexible attachment means, said flexible attachment means comprising a plurality of flexible upper members and a plurality of flexible lower members; said flexible upper members having one end of each fixed to said upper ring and the other end of each fixed to the upper end of one of said housing members and said flexible lower members having one end of each fixed to said lower ring and the other end of each fixed to the lower end of one of said housing members; said explosive charge assembly further comprising a plurality of elongated explosive shaped charges, each positioned in one of said housing members; and detonating means for detonating said shaped charges.
Claim 7
Dependent Claim
21 words
The explosive charge assembly of claim 4 having a cable head connected to the upper end of said center support member.
Claim 8
Dependent Claim
29 words
The explosive charge assembly of claim 4 wherein said flexible upper members and said flexible lower members are symmetrically arranged around said upper ring and said lower ring respectively.
Claim 9
Dependent Claim
37 words
The explosive charge assembly of claim 6 wherein each of said flexible upper members extend upwardly and outwardly from said upper ring and each of said flexible lower members extend downwardly and outwardly from said lower ring.
Claim 10
Dependent Claim
24 words
The explosive charge assembly of claim 4 wherein said flexible upper members and said flexible lower members are each narrow, flat spring steel bars.
Claim 11
Dependent Claim
29 words
The explosive charge assembly of claim 4 wherein said distance between said housing members and said support members is adjustable by sliding said upper ring along said support member.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |