Oil based drilling fluid
US6790811B2 · kind B2 · utility
30Cited by
12References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2001 |
| Grant date | Sep 14, 2004 |
| Priority date | — |
| Expiry date | May 15, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/925
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type emulsion to a oil-in-water type emulsion upon the protonation of the amine surfactant. Deprotonation of the amine surfactant reverses the conversion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.