US3728259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for drilling wells and method for preparing same
Assignee: ExxonMobil Upstream Research Co
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Filing: 1971-07-07
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Granted: 1973-04-17
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Expires: 1991-07-07
Abstract
Abstract DRILLING OF WELLS IN SUB-FREEZING ENVIRONMENTS IS CONDUCTED BY USING A FLUID WHICH CONTAINS A MAJOR AMOUNT OF AN AQUEOUS MEDIUM SUCH AS SEA WATER OR FRESH WATER, A HETEROPOLYSACCHARIDE PRODUCED BY THE ACTION OF BACTERIA OF THE GENUS XANTHOMONAS, AN OXYGENATED HYDROCARBON DISPERSANT WHICH MAY BE A POLYHYDRIIC ALCOHOL SUCH AS ETHYLENNE GLYCOL AND, OPTIONALLY, AN ALKALINE MEDIUM TO PROVIDE A DESIRED PH, THE POLYHYDRIC ALCOHOL AIDING IN THE DISPERSION OF THE HETEROPOLYSACCHARIDE IN THE AQUEOUS MEDIUM AND ACTING AS A FREEZING POINT DEPRESSANT OF THE DRILLING FLUID.
Inventors
- 👤 S Christman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:26
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206; C08; C08K; C08K7/00; C08K7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |