US3346057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well bore perforating apparatus
Assignee: Schlumberger Technology Corp
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Filing: 1966-10-10
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Granted: 1967-10-10
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Expires: 1986-10-10
Abstract
No abstract record available.
Inventors
- 👤 William T Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:52
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
APPARATUS FOR PROVIDING A UNIFORM BURR-FREE OPENING IN A WELL CASING COMPRISING: PERFORATING MEANS INCLUDING A SHAPED CHARGE FOR DEVELOPING, UPON ITS DETONATION, A PERFORATING JET DIRECTED ALONG A PREDETERMINED AXIS TO PERFORATE AN ADJACENT SURFACE OF A WELL CASING AND PRODUCE AN ENTRY HOLE THEREIN OF AN EXPECTED DIAMETER; MEANS FOR CONFINING THE ADJACENT CASING SURFACE INCLUDING A RIGID MEMBER SPACED FORWARDLY FROM SAID SHAPED CHARGE AND HAVING A CIRCULAR APERTURE THERETHROUGH OF A DIAMETER NO GREATER THAN SAID EXPECTED ENTRY HOLE DIAMETER AND CIRCUMSCRIBING SAID PERFORATING AXIS, THE OUTER FACE OF SAID RIGID MEMBER HAVING A TRANSVERSE CURVATURE THAT IS SUBSTANTIALLY COMPLEMENTARY TO THE ADJACENT CASING SURFACE; AND POSITIONING MEANS FOR URGING SAID OUTER FACE OF SAID RIGID MEMBER INTO COMPLEMENTARY CONTACT WITH THE ADJACENT CASING SURFACE.
Claim 2
Dependent Claim
129 words
APPARATUS FOR PROVIDING A UNIFORM BURR-FREE OPENING IN A WELL CASING COMPRISING: PERFORATING MEANS INCLUDING A SHAPED CHARGE FOR DEVELOPING, UPON ITS DETONATION, A PERFORATING JET DIRECTED ALONG A PREDETERMINED AXIS TO PERFORATE AN ADJACENT SURFACE OF A WELL CASING AND PRODUCE AN ENTRY HOLE THEREIN OF AN EXPECTED DIAMETER; MEANS FOR CONFINING THE ADJACENT CASING SURFACE INCLUDING A RIGID MEMBER SPACED FORWARDLY FROM SAID SHAPED CHARGE AND HAVING A CIRCULAR APERTURE THERETHROUGH OF A DIAMETER NO GREATER THAN SAID EXPECTED ENTRY HOLE DIAMETER AND CIRCUMSCRIBING SAID PERFORATING AXIS, THE OUTER FACE OF SAID RIGID MEMBER HAVING A TRANSVERSE CURVATURE THAT IS SUBSTANTIALLY COMPLEMENTARY TO THE ADJACENT CASING SURFACE; AND POSITIONING MEANS FOR URGING SAID OUTER FACE OF SAID RIGID MEMBER INTO COMPLEMENTARY CONTACT WITH THE ADJACENT CASING SURFACE.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |