Method of improving injectivity profiles and/or vertical conformance in heterogeneous formations
US4098337A · kind A · utility
29Cited by
9References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1977 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Jul 1, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/588
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Improved injectivity profiles and/or vertical conformance in flooding heterogeneous formations containing high permeability zones is obtained by injecting an aqueous polyacrylamide solution and an aqueous formaldehyde solution into the formation and allowing the polyacrylamide to react with the formaldehyde in the relatively high permeability zones to form a gel. Thereafter, improved sweep efficiency is realized in displacing hydrocarbon from the lesser permeability zones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.