Patent US3198250A successfully refreshed from Google Patents.
US3198250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well operation
Assignee: Phillips Petroleum Co
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Filing: 1962-12-31
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Granted: 1965-08-03
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Expires: 1982-12-31
Abstract
No abstract record available.
Inventors
- 👤 Robert S Hoch
- 👤 Ralph W Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:59
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/04; E21B47/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A METHOD FOR PREVENTING BLOWOUT OF A DRILLING WELL WHILE PULLING PIPE FROM THE WELL BORE, COMPRISING THE STEPS OF: CONTINUOUSLY DETERMINING THE AMOUNT OF PIPE REMOVED FROM THE WELL; CONTINUOUSLY MONITORING THE PRESENCE OF DRILLING FLUID AT A PREDETERMINED LEVEL IN THE WELL; PUMPING DRILLING FLUID INTO THE WELL AS NEEDED WHEN SAID FLUID IS BELOW SAID LEVEL, TO RETURN THE HEIGHT OF DRILLING FLUID UP TO SAID VESSEL; MEASURING THE DRILLING FLUID ADDED TO THE WELL; RECORDING THE AMOUNT OF PIPE REMOVED FROM THE WELL; RECORDING THE AMOUNT OF DRILLING FLUID ADDED TO THE WELL; AND ADJUSTING THE QUANTITY OF MUD IN THE HOLE SO THAT THE PRESSURE OF THE MUD WILL COUNTERACT THE PRESSURE IN THE BOREHOLE WHEN LESS DRILLING FLUID IS RECORDED THAN THE AMOUNT NECESSARY TO REPLACE THE VOLUME OF THE AMOUNT OF PIPE REMOVED.
Claim 2
Independent Claim
140 words
A METHOD FOR PREVENTING BLOWOUT OF A DRILLING WELL WHILE PULLING PIPE FROM THE WELL BORE, COMPRISING THE STEPS OF: CONTINUOUSLY DETERMINING THE AMOUNT OF PIPE REMOVED FROM THE WELL; CONTINUOUSLY MONITORING THE PRESENCE OF DRILLING FLUID AT A PREDETERMINED LEVEL IN THE WELL; PUMPING DRILLING FLUID INTO THE WELL AS NEEDED WHEN SAID FLUID IS BELOW SAID LEVEL, TO RETURN THE HEIGHT OF DRILLING FLUID UP TO SAID VESSEL; MEASURING THE DRILLING FLUID ADDED TO THE WELL; RECORDING THE AMOUNT OF PIPE REMOVED FROM THE WELL; RECORDING THE AMOUNT OF DRILLING FLUID ADDED TO THE WELL; AND ADJUSTING THE QUANTITY OF MUD IN THE HOLE SO THAT THE PRESSURE OF THE MUD WILL COUNTERACT THE PRESSURE IN THE BOREHOLE WHEN LESS DRILLING FLUID IS RECORDED THAN THE AMOUNT NECESSARY TO REPLACE THE VOLUME OF THE AMOUNT OF PIPE REMOVED.
References Cited (Backward Citations)
US2832566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |