Selective gel system for permeability profile control
US4903766A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1988 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Dec 30, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An aqueous gel composition is formed from xanthan gum crosslinked with ions of a transitional metal, resorcinol, and formaldehyde. The gel which initially forms is injected into a formation where it selectively enters pores in a more permeable zone. Once in the more permeable zone, the gel reheals and forms a shear and thermally stable gel. This gel can be used in high temperature formations in addition to those formations having a pH of from about 3.0 to about 10. After the shear and thermally stable gel has formed, a steam-flooding, water-flooding, or a carbon dioxide oil recovery process is commenced in a zone of lesser permeability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.