US3198252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for overcoming lost circulation
Assignee: ExxonMobil Upstream Research Co
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Filing: 1962-03-13
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Granted: 1965-08-03
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Expires: 1982-03-13
Abstract
No abstract record available.
Inventors
- 👤 Richard E Walker
- 👤 Philippoff Wladimir
- 👤 Victor V Horner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:34
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/502
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR OVERCOMING LOST CIRCULATION IN A BOREHOLE PENETRATING SUBSURFACE STRATA WHICH COMPRISES DISSOLVING A HIGH MOLECULAR WEIGHT POLYMER IN AN ORGANIC SOLVENT IN A CONCENTRATION SUFFICIENT TO PRODUCE, AT THE TEMPERATURE CONDITIONS PREVAILING WITHIN THE LOST CIRCULATION ZONE, A VISCOUS LIQUID HAVING A RECOVERABLE SHEAR RATE OF AT LEAST TWO RECOVERABLE SHEAR UNITS, A MENDING TIME LESS THAN ABOUT 30 SECONDS, AND A POSITIVE ELASTIC DRAG COEFFICIENT IN THE APPARATUS OF FIGURE 1 OF THE DRAWING OF AT LEAST 1.2 DYNES PER CENTIMETER PER UNIT OF SHEAR OVER AT LEAST 7 SHEAR UNITS AT A SHEAR RATE BETWEEN ABOUT 0.5 AND ABOUT 50 RECIPROCAL SECONDS, ENTRAINING SOLID PARTICLES IN SAID VISCOUS LIQUID, AND THEREAFTER INJECTING SAID VISCOUS LIQUID CONTAINING SAID SOLID PARTICLES INTO SAID BOREHOLD AND THE SURROUNDING LOST CIRCULATION ZONE AT A PRESSURE BELOW THE FORMATION FRACTURING PRESSURE.
Claim 2
Dependent Claim
141 words
A PROCESS FOR OVERCOMING LOST CIRCULATION IN A BOREHOLE PENETRATING SUBSURFACE STRATA WHICH COMPRISES DISSOLVING A HIGH MOLECULAR WEIGHT POLYMER IN AN ORGANIC SOLVENT IN A CONCENTRATION SUFFICIENT TO PRODUCE, AT THE TEMPERATURE CONDITIONS PREVAILING WITHIN THE LOST CIRCULATION ZONE, A VISCOUS LIQUID HAVING A RECOVERABLE SHEAR RATE OF AT LEAST TWO RECOVERABLE SHEAR UNITS, A MENDING TIME LESS THAN ABOUT 30 SECONDS, AND A POSITIVE ELASTIC DRAG COEFFICIENT IN THE APPARATUS OF FIGURE 1 OF THE DRAWING OF AT LEAST 1.2 DYNES PER CENTIMETER PER UNIT OF SHEAR OVER AT LEAST 7 SHEAR UNITS AT A SHEAR RATE BETWEEN ABOUT 0.5 AND ABOUT 50 RECIPROCAL SECONDS, ENTRAINING SOLID PARTICLES IN SAID VISCOUS LIQUID, AND THEREAFTER INJECTING SAID VISCOUS LIQUID CONTAINING SAID SOLID PARTICLES INTO SAID BOREHOLD AND THE SURROUNDING LOST CIRCULATION ZONE AT A PRESSURE BELOW THE FORMATION FRACTURING PRESSURE.
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) | 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 |