US3396787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depth control methods and apparatus
Assignee: Schlumberger Technology Corp
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Filing: 1966-08-31
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Granted: 1968-08-13
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Expires: 1986-08-31
Abstract
No abstract record available.
Inventors
- 👤 Roy R Vann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:07
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A METHOD FOR POSITIONING A WELL TOOL IN A WELL BORE HAVING DISTINCTIVE DEPTH-REFERENCE MEANS THEREIN AT A KNOWN DEPTH, COMPRISING: DISPLAYING AT THE EARTH''S SURFACE FIRST AND SECOND DESIGNATIONS RESPECTIVELY OF THE KNOWN DEPTH OF THE DISTINCTIVE DEPTH-REFERENCE MEANS AND OF A DESIRED DEPTH AT WHICH A WELL TOOL IS TO BE POSITIONED; PLACING INTO THE WELL BORE, MEANS FOR DETECTING THE DISTINCTIVE DEPTH-REFERENCE MEANS AND A WELL TOOL SPACED A KNOWN DISTANCE THEREFROM; MOVING SAID DETECTING MEANS AND SAID WELL TOOL INTO THE VICINITY OF THE DISTINCTIVE DEPTHREFERENCE MEANS FOR OBTAINING WITH FIRST DEPTH-INDICATING MEANS A FIRST INDICATION OF THE APPARENT DEPTH OF SAID DETECTING MEANS AND FOR OBTAINING WITH SECOND DEPTHINDICATING MEANS, A SECOND INDICATION OF THE APPARENT DEPTH OF SAID WELL TOOL; CORRELATING SAID FIRST INDICATION WITH SAID FIRST DESIGNATION TO VERIFY THE ACCURACY OF SAID FIRST INDICATION AND ADJUSTING AT LEAST SAID SECOND DEPTHINDICATING MEANS ACCORDINGLY TO OBTAIN A CORRECTED INDICATION OF THE TRUE PRESENT DEPTH OF SAID WELL TOOL; AND, THEREAFTER, MOVING SAID WELL TOOL TO BRING SAID SECOND DEPTHINDICATING MEANS INTO CORRESPONDENCE WITH SAID SECOND DESIGNATION.
Claim 2
Independent Claim
183 words
A METHOD FOR POSITIONING A WELL TOOL IN A WELL BORE HAVING DISTINCTIVE DEPTH-REFERENCE MEANS THEREIN AT A KNOWN DEPTH, COMPRISING: DISPLAYING AT THE EARTH''S SURFACE FIRST AND SECOND DESIGNATIONS RESPECTIVELY OF THE KNOWN DEPTH OF THE DISTINCTIVE DEPTH-REFERENCE MEANS AND OF A DESIRED DEPTH AT WHICH A WELL TOOL IS TO BE POSITIONED; PLACING INTO THE WELL BORE, MEANS FOR DETECTING THE DISTINCTIVE DEPTH-REFERENCE MEANS AND A WELL TOOL SPACED A KNOWN DISTANCE THEREFROM; MOVING SAID DETECTING MEANS AND SAID WELL TOOL INTO THE VICINITY OF THE DISTINCTIVE DEPTHREFERENCE MEANS FOR OBTAINING WITH FIRST DEPTH-INDICATING MEANS A FIRST INDICATION OF THE APPARENT DEPTH OF SAID DETECTING MEANS AND FOR OBTAINING WITH SECOND DEPTHINDICATING MEANS, A SECOND INDICATION OF THE APPARENT DEPTH OF SAID WELL TOOL; CORRELATING SAID FIRST INDICATION WITH SAID FIRST DESIGNATION TO VERIFY THE ACCURACY OF SAID FIRST INDICATION AND ADJUSTING AT LEAST SAID SECOND DEPTHINDICATING MEANS ACCORDINGLY TO OBTAIN A CORRECTED INDICATION OF THE TRUE PRESENT DEPTH OF SAID WELL TOOL; AND, THEREAFTER, MOVING SAID WELL TOOL TO BRING SAID SECOND DEPTHINDICATING MEANS INTO CORRESPONDENCE WITH SAID SECOND DESIGNATION.
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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |