Oil base drilling fluid composition and process
Abstract
Abstract THIS INVENTION RELATES TO AN OIL BASE DRILLING FLUID COMPOSITION, ADDITIVE, AND FILTER CAKE WHICH IS EFFECTIVE AT HIGH TEMPERATURES AND PRESSURES AND WHICH IS EASILY AND ECONOMICALLY FORMED BY DISPERSING PARTICLES OF AN OIL AND WATER INSOLUBLE VINYL TOLUENE-ACRYLATE COPOLYMER RESIN WHICH IS OBTAINED BY REACTING (A) VINYL TOLUENE, WITH (B) AN ACRYLATE MOIETY, SELECTED FROM THE CLASS CONSISTING OF METHYL, ETHYL, 2-ETHYL-HEXYL, BUTYL, DODECYL ACRYLATES, AND METHACRYLATES, IN A WATER-IN-OIL EMULSION. IN A PREFERRED EMBODIMENT LIGNITE, INCLUDING MINED LIGNITE, OLEOPHILIC LIGNITE OR MIXTURES THEREOF, TOGETHER WITH SAID COPOLYMER RESIN HAS PARTICULAR UTILITY FOR HIGH TEMPERATURE DRILLING CNDITIONS.
Inventors
- 👤 J Wood
- 👤 W Browning
- 👤 B Chesser
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |