Method for imparting selectivity to otherwise nonselective polymer control gels
US5002980A · kind A · utility
4Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Jun 9, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62L3/023
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method for selectively closing pores in a zone of greater permeability in a formation for profile control. A rehealable Xanthan biopolymer is combined with a crosslinked non-selective polyacrylamide polymer gel. The combined gel system is injected into a formation where the Xanthan biopolymer gel selectively enters a zone of greater permeability carrying therewith said non-selective gel. Once in the formation's zone of greater permeability, the gel reheals and forms a rigid gel with substantially better temperature stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.