Organic crosslinking of polymers for CO2 flooding profile control
US4793416A · kind A · utility
57Cited by
18References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1987 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Jun 30, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/164
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for recovering hydrocarbonaceous fluids from a formation having a substantially low pH where a rehealable gel prepared ex-situ is used to close off a zone of greater permeability. Said gel is obtained by mixing into an aqueous medium sufficient biopolymer amounts of a Xanthan or Alcaligene polysaccharide. This mixture is maintained at a pH of about 5.5 while an aminoplast resin in excess of 4,000 ppm is added thereto which causes said gel to form in about 0.5 to 6 hours. The resultant gel is suitable for use in a carbon-dioxide flood process. Said gels are very stable at a pH of less than about 5.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.