Fluid comprising cellulose nanofibrils and its use for oil mining
US6348436B1 · kind B1 · utility
36Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 1999 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a drilling fluid comprising cellulose nanofibrils comprising at least 80% of cells with primary walls and charged with carboxylic acids and with acidic polysaccharides, alone or as a mixture. This additive, alone, gives the drilling fluid shear-thinning properties and is stable up to temperatures of about 180° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.