US3236304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for the electrofracing of oil sand formation through a casing
Assignee: Individual
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Filing: 1961-09-01
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Granted: 1966-02-22
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Expires: 1981-09-01
Abstract
No abstract record available.
Inventors
- 👤 Sarapuu Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:01
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/16; E21B43/24; E21B43/2401
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
APPARATUS FOR PERFORATING THE CASING OF A BOREHOLE OR THE LIKE ADJACENT FUEL BEARING STRATE COMPRISING A TUBULAR SUPPORT MEMBER EXTENDING LONGITUDINALLY OF SAID BOREHOLE AND TERMINATING AT THE FUEL BEARING STRATA, AT LEAST ONE ELECTRODE CARRIED BY THE LOWER END OF SAID TUBULAR MEMBER ADJACENT SAID FUEL BEARING STRATA AND IN ENGAGEMENT WITH SAID CASING, MEANS DEFINING A PASSAGEWAY EXTENDING THROUGH SAID ELECTRODE, SAID PASSAGEWAY BEING IN FLUID COMMUNICATION WITH THE INTERIOR OF SAID TUBULAR MEMBER, AND AN ELECTRIC CIRCUIT INTERCONNECTED WITH SAID ELECTRODE TO ENERGIZE SAID ELECTRODE AND CAUSE SAID ELECTRODE TO PERFORATE SAID CASING AND HEAT THE FUEL BEARING STRATA ADJACENT SAID CASING.
Claim 2
Dependent Claim
106 words
APPARATUS FOR PERFORATING THE CASING OF A BOREHOLE OR THE LIKE ADJACENT FUEL BEARING STRATE COMPRISING A TUBULAR SUPPORT MEMBER EXTENDING LONGITUDINALLY OF SAID BOREHOLE AND TERMINATING AT THE FUEL BEARING STRATA, AT LEAST ONE ELECTRODE CARRIED BY THE LOWER END OF SAID TUBULAR MEMBER ADJACENT SAID FUEL BEARING STRATA AND IN ENGAGEMENT WITH SAID CASING, MEANS DEFINING A PASSAGEWAY EXTENDING THROUGH SAID ELECTRODE, SAID PASSAGEWAY BEING IN FLUID COMMUNICATION WITH THE INTERIOR OF SAID TUBULAR MEMBER, AND AN ELECTRIC CIRCUIT INTERCONNECTED WITH SAID ELECTRODE TO ENERGIZE SAID ELECTRODE AND CAUSE SAID ELECTRODE TO PERFORATE SAID CASING AND HEAT THE FUEL BEARING STRATA ADJACENT SAID CASING.
Claim 3
Independent Claim
68 words
A METHOD FOR PERFORATING THE CASING OF A WELLBORE COMMUNICATING WITH UNDERGROUND FUEL STRATA COMPRISING THE STEPS OF POSITIONING AN ELECTRODE WITHIN THE WELLBORE CASING ADJACENT THE FUEL BEARING STRATA, ESTABLISHING AN ELECTRICAL CIRCUIT BETWEEN A SURFACE GROUND ADJACENT THE WELLBORE AND SAID ELECTRODE, SUPPLYING ELECTRICAL ENERGY TO SAID CIRCUIT WHEREBY TO CAUSE SAID ELECTRODE TO PERFORATE THE CASING AND COME INTO ELECTRICAL CONTACT WITH SAID FUEL STRATA.
Claim 4
Independent Claim
68 words
A METHOD FOR PERFORATING THE CASING OF A WELLBORE COMMUNICATING WITH UNDERGROUND FUEL STRATA COMPRISING THE STEPS OF POSITIONING AN ELECTRODE WITHIN THE WELLBORE CASING ADJACENT THE FUEL BEARING STRATA, ESTABLISHING AN ELECTRICAL CIRCUIT BETWEEN A SURFACE GROUND ADJACENT THE WELLBORE AND SAID ELECTRODE, SUPPLYING ELECTRICAL ENERGY TO SAID CIRCUIT WHEREBY TO CAUSE SAID ELECTRODE TO PERFORATE THE CASING AND COME INTO ELECTRICAL CONTACT WITH SAID FUEL STRATA.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |