US3616689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature measurement method and apparatus
Assignee: Schlumberger Technology Corp
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Filing: 1969-10-24
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Granted: 1971-11-02
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Expires: 1989-10-24
Abstract
Abstract AN ILLUSTRATIVE EMBODIMENT OF THE INVENTION INCLUDES METHODS AND APPARATUS FOR MEASURING TEMPERATURE AND OTHER PARAMETERS OF INTEREST IN A WELL BORE BY USE OF A MONOCABLE LOGGING TOOL. A TEMPERATURE SENSITIVE ELEMENT CONNECTED TO THE END OF A MONOCABLE IS SUPPLIED WITH A CONSTANT CURRENT. THE VOLTAGE PRODUCED AT THE SURFACE IS THEREBY A FUNCTION OF THE RESISTANCE OF THE ELEMENT. THE VOLTAGE PRODUCED WITH THE TEMPERATURE SENSITIVE ELEMENT SHORTED OUT AND THAT PRODUCED WITH A KNOWN VALUE CALIBRATION RESISTOR MAY THEN BE COMBINED IN A MANNER TO ELIMINATE ERRORS DUE TO THE RESISTANCE OF THE MONOCABLE CONDUCTOR OR ANY STRAY MONOCABLE INSULATION LEAKAGE RESISTANCE.
Inventors
- 👤 Andre Scholberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:55
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; E21B47/07
Claims Analysis
Total Claims: 0
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |