Patent US3241612A successfully refreshed from Google Patents.
US3241612A
Expired / Lapsed
US
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Method of plugging porous formations
Assignee: Chevron USA Inc
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Filing: 1962-06-29
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Granted: 1966-03-22
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 Karl H Hiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:10
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/506; C09K8/508; C09K8/514
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A METHOD OF PLUGGING A POROUS FORMATION PENETRATED BY A BOREHOLE COMPRISING DETERMINING THE TEMPERATURE OF SAID FORMATION, PREPARING AN AQUEOUS PLUGGING SOLUTION OF METHYLCELLULOSE, SAID METHYICELLULOSE HAVING A DEGREE OF SUBSTITUTION OF BETWEEN 1.6 TO 2.0 METHOXY GROUPS AND A VISCOSITY OF BETWEEN ABOUT 100 CENTIPOISE AND 8000 CENTIPOISE IN 2.0 PERCENT BY WEIGHT WATER SOLUTION, SAID AQUEUOUS PLUGGING SOLUTION CONTAINING BETWEEN ABOUT 0.5 AND 3 PERCENT BY WEIGHT OF SAID METHYLTION TO A VALUE LESS THAN SAID DETERMINED FORMATION TEMPERATURE BY ADDING TO SAID SOLUTION A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF NITRATE, BROMIDE, CHLORIDE, ACETATE, TARTRATE AND SULFATE, INJECTING SAID SOLUTION THROUGH SAID BOREHOLE INTO SAID POROUS FORMATION, APPLYING PRESSURE TO SAID SOLUTION TO FORCE IT INTO SAID FORMATION, AND MAINTAINING THE PRESSURE ON SAID SOLUTION FOR A PREDETERMINED TIME TO ALLOW SAID SOLUTION TO BE HEATED BY SAID FORMATION WHEREBY THE SOLUTION GELS.
Claim 2
Independent Claim
149 words
A METHOD OF PLUGGING A POROUS FORMATION PENETRATED BY A BOREHOLE COMPRISING DETERMINING THE TEMPERATURE OF SAID FORMATION, PREPARING AN AQUEOUS PLUGGING SOLUTION OF METHYLCELLULOSE, SAID METHYICELLULOSE HAVING A DEGREE OF SUBSTITUTION OF BETWEEN 1.6 TO 2.0 METHOXY GROUPS AND A VISCOSITY OF BETWEEN ABOUT 100 CENTIPOISE AND 8000 CENTIPOISE IN 2.0 PERCENT BY WEIGHT WATER SOLUTION, SAID AQUEUOUS PLUGGING SOLUTION CONTAINING BETWEEN ABOUT 0.5 AND 3 PERCENT BY WEIGHT OF SAID METHYLTION TO A VALUE LESS THAN SAID DETERMINED FORMATION TEMPERATURE BY ADDING TO SAID SOLUTION A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF NITRATE, BROMIDE, CHLORIDE, ACETATE, TARTRATE AND SULFATE, INJECTING SAID SOLUTION THROUGH SAID BOREHOLE INTO SAID POROUS FORMATION, APPLYING PRESSURE TO SAID SOLUTION TO FORCE IT INTO SAID FORMATION, AND MAINTAINING THE PRESSURE ON SAID SOLUTION FOR A PREDETERMINED TIME TO ALLOW SAID SOLUTION TO BE HEATED BY SAID FORMATION WHEREBY THE SOLUTION GELS.
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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |