Preventing flow through subterranean zones
US6176315A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1998 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Dec 4, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/902
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides methods of preventing the flow of water or gas or both through a subterranean zone having a high temperature and a depth such that a long pumping time is required to place a sealing composition therein. The methods basically comprise the steps of preparing a polymeric sealing composition comprised of water, a cross-linking agent and a selected water-soluble polymer which reacts with the cross-linking agent and forms a sealing gel which is stable for a desired period of time at the temperature of the zone and has a pumping time before gelation in the presence of the cross-linking agent whereby the composition can be pumped to the depth of the zone and placed therein. Thereafter, the sealing composition is pumped into the zone and allowed to form a sealing gel therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.