US3555896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stress detector and locator for well pipe
Assignee: GREAT SOUTHERN OIL TOOL CO Inc
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Filing: 1969-01-15
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Granted: 1971-01-19
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Expires: 1989-01-15
Abstract
Abstract THE STUCK POINT OF A PIPE STRING IN A WALL BORE IS LOCATED BY APPLYING AXIAL OR TORSIONAL STRESS TO THE UPPER END OF THE PIPE STRING AND MONITORING STRAIN AT DIFFERENT TEST DEPTHS WITHIN THE BORE HOLE. STRAIN IS MEASURED BY AN INDUCTANCE UNIT SENSING SMALL DISPLACEMENTS BETWEEN A PAIR OF ANCHORING ASSEMBLIES MECHANICALLY ANCHORED BY ONE-WAY WEDGING DEVICES TO THE PIPE AT EACH TEST DEPTH, WHILE THE PIPE STRING IS UNDER STRESS. THE ANCHORING ASSEMBLIES INTERCONNECTED BY THE INDUCTANCE UNIT, ARE SUSPENDED BY A CABLE WITHIN THE PIPE STRING, THE LOWERMOST ANCHORING ASSEMBLY CARRYING OTHER TOOLS FOR REMOVAL OF PIPE SECTIONS FROM THE STRING AT OR ABOVE THE STUCK POINT.
Inventors
- 👤 Preston C Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |