Radioactivity and electrical logging tool combination
Abstract
Abstract AN ILLUSTRATIVE EMBODIMENT OF THE INVENTION IS DIRECTED TO A COMBINATION SIDEWALL RADIOACTIVITY AND ELECTRICAL LOGGING TOOL. ONE OR MORE RADIATION DETECTORS SPACED FROM A SOURCE OF RADIOACTIVITY ARE HOUSED WITHIN A SKID THAT IS URGED AGAINST THE BOREHOLE WALL. A BACKUP PAD EXTENDING FROM THE OPPOSITE SIDE OF THE LOGGING TOOL ALSO IS URGED AGAINST THE BOREHOLE WALL. THE WORKING SURFACE OF THE PAD IS FORMED OF A TOUGH ELECTRICAL INSULATOR THAT SUPPORTS THREE VERTICALLY SPACED ELECTRODES. THE ELECTRODES ARE EITHER FLUSH WITH OR RECESSED IN THE FACE OF THE INSULATOR. THE STRUCTURAL ARRANGEMENT PREVENTS THE EXPOSED ELECTRODES FROM BEING SHORT-CIRCUITED THROUGH THE DRILLING MUD OR FROM BEING TORN OFF THE PAD DURING OPERATION.
Inventors
- 👤 John H Winkler Jr
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |