Patent US5415704A successfully refreshed from Google Patents.
US2729784A
Expired / Lapsed
US
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Method and apparatus for electric well logging
Assignee: Lane Wells Co
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Filing: 1950-11-30
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Granted: 1956-01-03
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Expires: 1970-11-30
Abstract
No abstract record available.
Inventors
- 👤 Robert E Fearon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:08
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A METHOD OF MAKING AN ELECTRIC LOG OF THE FORMATIONS ADJACENT A WELL WHICH CONTAINS AN ELECTRICALLY CONDUCTIVE MEDIUM, THE COMPRISES INTRODUCING A FIRST ELECTRICAL CURRENT BETWEEN A FIRST PAIR OF AXIALLY SPACED POSITIONS BOUNDING A FIRST POSITION OF SAID ELECTRICALLY CONDUCTIVE MEDIUM IN A MANNER SUCH THAT SAID FIRST ELECTRICAL CURENT WILL HAVE A SUBSTANTIAL AXIAL COMPONENT, SEPARATELY INTRODUCING A SECOND ELECTRICAL CURRENT BETWEEN A SECOND PAIR OF AXIALLY SPACED POSITIONS BOUNDING A SECOND PORTION AXIALY SPACED FROM SAID FIRST PORTION OF SAID ELECTRICALLY CONDUCTIVE MEDIUM IN A MANNER SUCH THAT SAID SECOND ELECTRICAL CURRENT WILL HAVE A SUBSTANTIAL AXIAL COMPONENT OPPOSITE TO SAID AXIAL COMPONENT OF SAID FIRST ELECTRICAL CURRENT, WHEREBY THE FLOW OF THE AXIAL COMPONENTS IN OPPOSITE DIRECTIONS WILL CREATE ON A PAIR OF AXIALY SPACED LOCATIONS IN THE REGION BETWEEN SAID PORTIONS SUBSTANTIALLY EQUAL POTENTIALS DIFFERENT FROM THE POTENTIAL OF ANY GIVEN REFERENCE POINT LOCATED IN REMOTE PORTIONS OF SAID ELECTRICALLY CONDUCTIVE MEDIUM, AND MEASURING A FUNCTION OF THE CURRENT CONDUCTED BETWEEN SAID REGION AND THE FORMATION ADJACENT THERETO.
Claim 2
Independent Claim
174 words
A METHOD OF MAKING AN ELECTRIC LOG OF THE FORMATIONS ADJACENT A WELL WHICH CONTAINS AN ELECTRICALLY CONDUCTIVE MEDIUM, THE COMPRISES INTRODUCING A FIRST ELECTRICAL CURRENT BETWEEN A FIRST PAIR OF AXIALLY SPACED POSITIONS BOUNDING A FIRST POSITION OF SAID ELECTRICALLY CONDUCTIVE MEDIUM IN A MANNER SUCH THAT SAID FIRST ELECTRICAL CURENT WILL HAVE A SUBSTANTIAL AXIAL COMPONENT, SEPARATELY INTRODUCING A SECOND ELECTRICAL CURRENT BETWEEN A SECOND PAIR OF AXIALLY SPACED POSITIONS BOUNDING A SECOND PORTION AXIALY SPACED FROM SAID FIRST PORTION OF SAID ELECTRICALLY CONDUCTIVE MEDIUM IN A MANNER SUCH THAT SAID SECOND ELECTRICAL CURRENT WILL HAVE A SUBSTANTIAL AXIAL COMPONENT OPPOSITE TO SAID AXIAL COMPONENT OF SAID FIRST ELECTRICAL CURRENT, WHEREBY THE FLOW OF THE AXIAL COMPONENTS IN OPPOSITE DIRECTIONS WILL CREATE ON A PAIR OF AXIALY SPACED LOCATIONS IN THE REGION BETWEEN SAID PORTIONS SUBSTANTIALLY EQUAL POTENTIALS DIFFERENT FROM THE POTENTIAL OF ANY GIVEN REFERENCE POINT LOCATED IN REMOTE PORTIONS OF SAID ELECTRICALLY CONDUCTIVE MEDIUM, AND MEASURING A FUNCTION OF THE CURRENT CONDUCTED BETWEEN SAID REGION AND THE FORMATION ADJACENT THERETO.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |