Polyimide quaternary salts as clay stabilization agents
US5160642A · kind A · utility
44Cited by
23References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1990 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | May 25, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/922
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A clayish formation, such as encountered in rock surrounding an oil well bore, is stabilized with a quaternary ammonium salt of an imide of polymaleic anhydride. The invention is particularly relevant to hydraulic fracturing fluids used for enhanced oil recovery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.