US3151291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of locating subsurface lateral discontinuties between two spaced wells
Assignee: Pan American Petroleum Corp
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Filing: 1959-12-07
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Granted: 1964-09-29
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Expires: 1979-12-07
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Eisler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:34
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/02; G01V3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
THE METHOD OF DETERMINING THE EXISTENCE AND APPROXIMATE LOCATION OF DISCONTINUITY IN SUBSURFACE STRATA EXTENDING BETWEEN TWO SPACED WELLS, WHICH METHOD COMPRISES PLACING EACH ELECTRODE OF A PAIR OF ELECTRODES IN A RESPECTIVE ONE OF SAID WELLS WITHIN A LOW-RESISTIVITY SUBSURFACE STRATUM LIKELY TO BE INTERRUPTED BY SAID DISCONTINUITY IF IT EXITS, CONNECTING SAID ELECTRODES TO A GENERATOR OF ELECTRIC POWER, PASSING ELECTRIC CURRENT FORM SAID GENERATOR THROUGH THE EARTH BETWEEN SAID ELECTRODES, AND MEASURING THE POTENTIAL GRADIENT AT THE GROUND SURFACE AS A FUNCTION OF DISTANCE ALONG A TRAVERSE BETWEEN SAID WELLS DUE TO THE FLOW OF SAID CURRENT, WHEREBY DEVIATIONS FROM A SMOOTHLY VARYING GRADIENT CURVE MAY BE OBSERVED TO SHOW SAID DISCONTINUITY.
Claim 2
Independent Claim
115 words
THE METHOD OF DETERMINING THE EXISTENCE AND APPROXIMATE LOCATION OF DISCONTINUITY IN SUBSURFACE STRATA EXTENDING BETWEEN TWO SPACED WELLS, WHICH METHOD COMPRISES PLACING EACH ELECTRODE OF A PAIR OF ELECTRODES IN A RESPECTIVE ONE OF SAID WELLS WITHIN A LOW-RESISTIVITY SUBSURFACE STRATUM LIKELY TO BE INTERRUPTED BY SAID DISCONTINUITY IF IT EXITS, CONNECTING SAID ELECTRODES TO A GENERATOR OF ELECTRIC POWER, PASSING ELECTRIC CURRENT FORM SAID GENERATOR THROUGH THE EARTH BETWEEN SAID ELECTRODES, AND MEASURING THE POTENTIAL GRADIENT AT THE GROUND SURFACE AS A FUNCTION OF DISTANCE ALONG A TRAVERSE BETWEEN SAID WELLS DUE TO THE FLOW OF SAID CURRENT, WHEREBY DEVIATIONS FROM A SMOOTHLY VARYING GRADIENT CURVE MAY BE OBSERVED TO SHOW SAID DISCONTINUITY.
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) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |