Patent US3040820A successfully refreshed from Google Patents.
US3040820A
Expired / Lapsed
US
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Method for drilling with clear water
Assignee: Pan American Petroleum Corp
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Filing: 1958-02-17
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Granted: 1962-06-26
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Expires: 1978-02-17
Abstract
No abstract record available.
Inventors
- 👤 Julius P Gallus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C09K8/06; C09K8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE METHOD OF DRILLING A WELL IN WHICH WATER IS CIRCULATED IS SAID WELL COMPRISING ADDING TO SAID WATER AS IT LEAVES THE WELL AND ENTERS THE MUD PITS SUFFICIENT ACRYLAMIDE POLYMER HYDROLYTES TO PROVIDE AT THE PUMP SUCTION WATER CONTAINING NO MORE THAN A FEW TENTHS PERCENT OF INORGANIC SOLIDS, AND ADDING TO THE WATER AS IT LEAVES THE MUD PITS AND ENTERS THE WELL FROM ABOUT 0.001 TO ABOUT 0.02 POUNDS PER 42-GALLON BARREL OF ACRYLAMIDE POLYMER HYDROLYTES, SAID HYDROLYTES IN BOTH CASES HAVING FROM ABOUT 10 TO ABOUT 120 AMIDE GROUPS FOR EACH CARBOXYL GROUP AND HAVING A VISCOSITY OF AT LEAST ABOUT 4 CENTIPOISES FOR A 0.5 PERCENT BY WEIGHT AQUEOUS SOLUTION OF SAID HYDROLYTES, AND SAID HYDROLYTES BEING ADDED IN BOTH CASES AS AN AQUEOUS SOLUTION.
Claim 2
Independent Claim
131 words
THE METHOD OF DRILLING A WELL IN WHICH WATER IS CIRCULATED IS SAID WELL COMPRISING ADDING TO SAID WATER AS IT LEAVES THE WELL AND ENTERS THE MUD PITS SUFFICIENT ACRYLAMIDE POLYMER HYDROLYTES TO PROVIDE AT THE PUMP SUCTION WATER CONTAINING NO MORE THAN A FEW TENTHS PERCENT OF INORGANIC SOLIDS, AND ADDING TO THE WATER AS IT LEAVES THE MUD PITS AND ENTERS THE WELL FROM ABOUT 0.001 TO ABOUT 0.02 POUNDS PER 42-GALLON BARREL OF ACRYLAMIDE POLYMER HYDROLYTES, SAID HYDROLYTES IN BOTH CASES HAVING FROM ABOUT 10 TO ABOUT 120 AMIDE GROUPS FOR EACH CARBOXYL GROUP AND HAVING A VISCOSITY OF AT LEAST ABOUT 4 CENTIPOISES FOR A 0.5 PERCENT BY WEIGHT AQUEOUS SOLUTION OF SAID HYDROLYTES, AND SAID HYDROLYTES BEING ADDED IN BOTH CASES AS AN AQUEOUS SOLUTION.
References Cited (Backward Citations)
CA522851A
Cited
US2252669A
Cited
US2775557A
Cited
US2867584A
Cited
US2827964A
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US2854407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |