US3247904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual completion tool
Assignee: Richfield Oil Corp
•
Filing: 1963-04-01
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Granted: 1966-04-26
•
Expires: 1983-04-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles E Wakefield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:59
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
APPARATUS FOR PRODUCING A CASED WELL FROM AN UPPER AND A LOWER PRODUCTION ZONE THROUGH A TUBING STRING COMPRISING: A DUAL COMPLETION MANDREL CONNECTED TO AND IN FLUID COMMUNICATION WITH SAID TUBING STRING, SAID MANDREL HAVING AN INNER BARREL INTEGRAL WITH SAID MANDREL, TUBULAR MEANS FORMING A PASSAGEWAY THROUGH SAID MANDREL INTO SAID INNER BARREL FOR PRODUCING SAID UPPER ZONE THROUGH SAID INNER BARREL OF SAID MANDREL, MEANS FOR PACKING OFF THE ANNULUS BETWEEN SAID TUBING STRING AND SAID WELL ABOVE SAID MANDREL AND SAID PRODUCTION ZONES, PACKING MEANS POSITIONABLE INTERMEDIATE SAID ZONES IN THE ANNULUS BETWEEN THE WELL CASING AND SAID TUBING FOR SEPARATING SAID ZONES, AND MEANS FOR PRODUCING SAID LOWER ZONE THROUGH SAID MANDREL AND SAID TUBING STRING.
Claim 2
Dependent Claim
121 words
APPARATUS FOR PRODUCING A CASED WELL FROM AN UPPER AND A LOWER PRODUCTION ZONE THROUGH A TUBING STRING COMPRISING: A DUAL COMPLETION MANDREL CONNECTED TO AND IN FLUID COMMUNICATION WITH SAID TUBING STRING, SAID MANDREL HAVING AN INNER BARREL INTEGRAL WITH SAID MANDREL, TUBULAR MEANS FORMING A PASSAGEWAY THROUGH SAID MANDREL INTO SAID INNER BARREL FOR PRODUCING SAID UPPER ZONE THROUGH SAID INNER BARREL OF SAID MANDREL, MEANS FOR PACKING OFF THE ANNULUS BETWEEN SAID TUBING STRING AND SAID WELL ABOVE SAID MANDREL AND SAID PRODUCTION ZONES, PACKING MEANS POSITIONABLE INTERMEDIATE SAID ZONES IN THE ANNULUS BETWEEN THE WELL CASING AND SAID TUBING FOR SEPARATING SAID ZONES, AND MEANS FOR PRODUCING SAID LOWER ZONE THROUGH SAID MANDREL AND SAID TUBING STRING.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |