Patent US2499548A successfully refreshed from Google Patents.
US2499548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluids and methods of using same
Assignee: Phillips Petroleum Co
•
Filing: 1945-11-16
•
Granted: 1950-03-07
•
Expires: 1965-11-16
Abstract
No abstract record available.
Inventors
- 👤 Cary R Wagner
- 👤 William N Axe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:17
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A PROCESS OF DRILLING WELLS COMPRISING THE STEPS OF DRILLING THE WELL WITH WELL DRILLING TOOLS AND CIRCULATING THROUGH THE WELL DURING SAID DRILLING A WATER BASE DRILLING MUD WHICH FORMS A FILTER CAKE ON THE WALL OF THE WELL, THE IMPROVEMENT COMPRISING INCORPORATING IN SAID DRILLING MUD A WATER SOLUBLE CELLULOSE SELECTED FROM THE GROUP CONSISTING OF AMINOCELLULOSE AND THE SALTS FORMED BY THE ADDITION REACTIONS BETWEEN AMINOCELLULOSE AND STRONG MINERAL ACIDS IN AN AMOUNT SUFFICIENT TO REDUCE THE WATER LOSS DUE TO THE FILTRATION THROUGH SAID FILTER CAKE BUT INSUFFICIENT TO INCREASE THE VISCOSITY OF SAID DRILLING MUD TO SUCH AN EXTENT THAT IT CANNOT BE CIRCULATED.
Claim 2
Dependent Claim
110 words
IN A PROCESS OF DRILLING WELLS COMPRISING THE STEPS OF DRILLING THE WELL WITH WELL DRILLING TOOLS AND CIRCULATING THROUGH THE WELL DURING SAID DRILLING A WATER BASE DRILLING MUD WHICH FORMS A FILTER CAKE ON THE WALL OF THE WELL, THE IMPROVEMENT COMPRISING INCORPORATING IN SAID DRILLING MUD A WATER SOLUBLE CELLULOSE SELECTED FROM THE GROUP CONSISTING OF AMINOCELLULOSE AND THE SALTS FORMED BY THE ADDITION REACTIONS BETWEEN AMINOCELLULOSE AND STRONG MINERAL ACIDS IN AN AMOUNT SUFFICIENT TO REDUCE THE WATER LOSS DUE TO THE FILTRATION THROUGH SAID FILTER CAKE BUT INSUFFICIENT TO INCREASE THE VISCOSITY OF SAID DRILLING MUD TO SUCH AN EXTENT THAT IT CANNOT BE CIRCULATED.
References Cited (Backward Citations)
US1947464A
Cited
US2129913A
Cited
US2336171A
Cited
US2364434A
Cited
US2273925A
Cited
US2337296A
Cited
US2425768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |