Method for imparting selectivity to otherwise nonselective polymer profile control gels
US4856586A · kind A · utility
8Cited by
11References
21Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 2, 1988 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Jun 2, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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-slective 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.