US2536113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling fluids and methods of use
Assignee: Phillips Petroleum Co
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Filing: 1947-08-15
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Granted: 1951-01-02
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Expires: 1967-08-15
Abstract
No abstract record available.
Inventors
- 👤 Cary R Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:25
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
96 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 FREE ACID CARBOXYALKYLCELLULOSE IN AN AMOUNT SUFFICIENT TO BE CONVERTED INTO SUFFICIENT WATER SOLUBLE CARBOXYALKYLCELLULOSE TO REDUCE THE WATER LOSS DUE TO 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
96 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 FREE ACID CARBOXYALKYLCELLULOSE IN AN AMOUNT SUFFICIENT TO BE CONVERTED INTO SUFFICIENT WATER SOLUBLE CARBOXYALKYLCELLULOSE TO REDUCE THE WATER LOSS DUE TO 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)
US2425768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |