Alkoxylated asphalts as co-surfactants in surfactant oil recovery processes usable in formations containing water having high concentrations of polyvalent ions such as calcium and magnesium
US4021356A · kind A · utility
8Cited by
3References
6Claims
0Family size
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Inventors
Key dates
| Filing date | Sep 10, 1975 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Sep 10, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Ethoxylated asphalt solutions have high tolerance for sodium and calcium ions as well as magnesium and other divalent ions. The use of ethoxylated asphalts in combination with other surfactants that normally precipitate out in the presence of these cations results in a stable surfactant solution wherein the surfactant will not precipitate out and wherein the surfactant solution has the ability to efficiently sweep oil from subterranean hydrocarbon reservoirs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.