Patent US2778604A successfully refreshed from Google Patents.
US2778604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing lost returns
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1954-09-01
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Granted: 1957-01-22
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Expires: 1974-09-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Carl E Reistle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:28
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A METHOD FOR PREVENTING LOSS OF AQUEOUS DRILLING FLUID TO A THIEF FORMATION PENETRATED BY A WELL BORE DURING A DRILLING OPERATION IN WHICH AQUEOUS DRILLING FLUID IS NORMALLY CIRCULATED DOWN A HOLLOW DRILL STEM AND UP THE WELL BORE WHICH COMPRISES LOCATING AT A LEVEL PENETRATING THE THIEF FORMATION IN SAID WELL WHERE AQUEOUS DRILLING FLUID IS BEING LOST A BODY OF DEHYDRATED CITRUS PULP HAVING THE CHARACTERISTIC OF INCREASING IN BULK VOLUME WHEN CONTACTED WITH WATER, SAID CITRUS PULP BEING COATED WITH A MATERIAL SLOWLY DISPLACEABLE IN WATER, CONTACTING SAID BODY WITH AN ALKALINE AQUEOUS MEDIUM IN PLACE UNDER PRESSURE FOR A SUFFICIENT TIME TO DISPLACE THE COATING AND TO CAUSE THE PULP TO INCREASE IN BULK VOLUME A SUFFICIENT AMOUNT TO SEAL OFF SAID THIEF FORMATION, AND THEN RESUMING NORMAL CIRCULATION OF SAID DRILLING FLUID.
Claim 2
Independent Claim
138 words
A METHOD FOR PREVENTING LOSS OF AQUEOUS DRILLING FLUID TO A THIEF FORMATION PENETRATED BY A WELL BORE DURING A DRILLING OPERATION IN WHICH AQUEOUS DRILLING FLUID IS NORMALLY CIRCULATED DOWN A HOLLOW DRILL STEM AND UP THE WELL BORE WHICH COMPRISES LOCATING AT A LEVEL PENETRATING THE THIEF FORMATION IN SAID WELL WHERE AQUEOUS DRILLING FLUID IS BEING LOST A BODY OF DEHYDRATED CITRUS PULP HAVING THE CHARACTERISTIC OF INCREASING IN BULK VOLUME WHEN CONTACTED WITH WATER, SAID CITRUS PULP BEING COATED WITH A MATERIAL SLOWLY DISPLACEABLE IN WATER, CONTACTING SAID BODY WITH AN ALKALINE AQUEOUS MEDIUM IN PLACE UNDER PRESSURE FOR A SUFFICIENT TIME TO DISPLACE THE COATING AND TO CAUSE THE PULP TO INCREASE IN BULK VOLUME A SUFFICIENT AMOUNT TO SEAL OFF SAID THIEF FORMATION, AND THEN RESUMING NORMAL CIRCULATION OF SAID DRILLING FLUID.
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) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |