Aqueous acid gels and use thereof
US4604218A · kind A · utility
19Cited by
8References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1985 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | Mar 28, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/923
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Copolymers of a predominant proportion of an alkyl allyl ammonium halide and a vinyl phosphonic acid, optionally with other copolymerizable vinylidene monomers, form aqueous acid gel compositions when added to the aqueous acid, along with a gelling agent selected from titanium or zirconium compounds, and gel destabilizing compounds containing fluoride, sulphate or phosphate anions, the apparent viscosity and time of stability of the acid gel composition being controlled by the addition of these ingredients. These acid gels are particularly effective as fracture-acidizing fluids in deep, hot oil or gas well stimulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.