US3262050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guard electrode type method and apparatus for logging boreholes with switch means foraltering the effective depth of penetration of the current from the measuring electrode
Assignee: BP PLC
•
Filing: 1963-02-20
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Granted: 1966-07-19
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Expires: 1983-02-20
Abstract
No abstract record available.
Inventors
- 👤 Threadgold Philip
- 👤 Thomas Godfrey Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:09
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A METHOD OF MEASURING, AT VARIOUS PENETRATION DEPTHS, THE ELECTRICAL RESISTIVITIES OF EARTH FORMATIONS TRAVERSED BY A BOREHOLE CONTAINING AN ELECTRICALLY CONDUCTIVE FLUID, WHICH COMPRISES THE STEPS OF LOCATING WITHIN THE BOREHOLE A SYMMETRICAL VERTICAL STRUCTURE INCLUDING A MEASURING ELECTRODE FLANKED BY A PAIR OF GUARD ELECTRODES AND BY AT LEAST ONE PAIR OF ELECTRODES SPACED OUTSIDE THE GUARD ELECTRODES, CONNECTING SAID MEASURING ELECTRODE AND EACH OF SAID GUARD ELECTRODES TO ONE TERMINAL OF A SOURCE OF ELECTRIC CURRENT WHEREBY THEY ARE AT SUBSTANTIALLY EQUIPOTENTIAL AND ALL EMIT CURRENT TO AID GROUND FORMATIONS AND THEN SELECTIVELY DURING DIFFERENT PERIODS OF TIME, CONNECTING SAID PAIR OF FURTHER ELECTRODES TO SAID ONE TERMINAL OF SAID SOURCE TO CAUSE SAID FURTHER ELECTRODES ALSO TO EMIT CURRENT, CONNECTING SAID PAIR OF FURTHER ELECTRODES TO THE OPPOSITE TERMINAL OF SAID SOURCE TO CAUSE SAID FURTHER ELECTRODES TO RECIVE CURRENT AND LEAVING SAID FURTHER PAIR OF ELECTRODES UNCONNECTED TO CAUSE THEM TO BE QUIESCENT, THEREBY TO ALTER THE EFFECTIVE PENETRATION DEPTH INTO SAID EARTH FCORMATIONS OF THE THIN FOCUSED ELECTRIC
Claim 2
Independent Claim
174 words
A METHOD OF MEASURING, AT VARIOUS PENETRATION DEPTHS, THE ELECTRICAL RESISTIVITIES OF EARTH FORMATIONS TRAVERSED BY A BOREHOLE CONTAINING AN ELECTRICALLY CONDUCTIVE FLUID, WHICH COMPRISES THE STEPS OF LOCATING WITHIN THE BOREHOLE A SYMMETRICAL VERTICAL STRUCTURE INCLUDING A MEASURING ELECTRODE FLANKED BY A PAIR OF GUARD ELECTRODES AND BY AT LEAST ONE PAIR OF ELECTRODES SPACED OUTSIDE THE GUARD ELECTRODES, CONNECTING SAID MEASURING ELECTRODE AND EACH OF SAID GUARD ELECTRODES TO ONE TERMINAL OF A SOURCE OF ELECTRIC CURRENT WHEREBY THEY ARE AT SUBSTANTIALLY EQUIPOTENTIAL AND ALL EMIT CURRENT TO AID GROUND FORMATIONS AND THEN SELECTIVELY DURING DIFFERENT PERIODS OF TIME, CONNECTING SAID PAIR OF FURTHER ELECTRODES TO SAID ONE TERMINAL OF SAID SOURCE TO CAUSE SAID FURTHER ELECTRODES ALSO TO EMIT CURRENT, CONNECTING SAID PAIR OF FURTHER ELECTRODES TO THE OPPOSITE TERMINAL OF SAID SOURCE TO CAUSE SAID FURTHER ELECTRODES TO RECIVE CURRENT AND LEAVING SAID FURTHER PAIR OF ELECTRODES UNCONNECTED TO CAUSE THEM TO BE QUIESCENT, THEREBY TO ALTER THE EFFECTIVE PENETRATION DEPTH INTO SAID EARTH FCORMATIONS OF THE THIN FOCUSED ELECTRIC
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) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |