US3280912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Restoring lost circulation in wells
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1963-12-09
•
Granted: 1966-10-25
•
Expires: 1983-12-09
Abstract
No abstract record available.
Inventors
- 👤 Jr James R Sheffield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:29
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF PREVENTING LOSS OF DRILLING FLUID IN A WELL PENETRATING AN EARTH FORMATION THAT HAS BEEN ACCIDENTALLY FRACTURED DURING DRILLING OPERATIONS, COMPRISING: FORMING A SALINE SLURRY COMPRISING A LIQUID VEHICLE, BETWEEN 80 AND 150 POUNDS OF AN ANGULAR, GRADED PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF LIMESTONE, MARBLE, SAND, AND GILSONITE PER 42 GALLONS OF LIQUID VEHICLE, SAID PARTICULATE MATERIA; HAVING PARTICLE SIZES IN THE COMPLETE RANGE OF 4 TO 200 MESH; OPENING THE FRACTURE IN THE FRACTURED ZONE AND FORCING THE SLURRY THEREINTO; ACTERISTICS; AND CONTINUING INJECTION OF THE SLURRY UNTIL THE HYDROSTATIC PRESSURE REACHES A VALUE DETERMINED BY THE WELL CHARCIRCULATNG DRILLING FLUID TO BUILD UP A FILTER CAKE ACROSS THE SOLIDS BRIDGING THE FRACTURE.
Claim 2
Independent Claim
120 words
THE METHOD OF PREVENTING LOSS OF DRILLING FLUID IN A WELL PENETRATING AN EARTH FORMATION THAT HAS BEEN ACCIDENTALLY FRACTURED DURING DRILLING OPERATIONS, COMPRISING: FORMING A SALINE SLURRY COMPRISING A LIQUID VEHICLE, BETWEEN 80 AND 150 POUNDS OF AN ANGULAR, GRADED PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF LIMESTONE, MARBLE, SAND, AND GILSONITE PER 42 GALLONS OF LIQUID VEHICLE, SAID PARTICULATE MATERIA; HAVING PARTICLE SIZES IN THE COMPLETE RANGE OF 4 TO 200 MESH; OPENING THE FRACTURE IN THE FRACTURED ZONE AND FORCING THE SLURRY THEREINTO; ACTERISTICS; AND CONTINUING INJECTION OF THE SLURRY UNTIL THE HYDROSTATIC PRESSURE REACHES A VALUE DETERMINED BY THE WELL CHARCIRCULATNG DRILLING FLUID TO BUILD UP A FILTER CAKE ACROSS THE SOLIDS BRIDGING THE FRACTURE.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |