Prevention of inflow of water into wells or shafts which have already been drilled or are being drilled
US4155405A · kind A · utility
22Cited by
4References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1977 |
| Grant date | May 22, 1979 |
| Priority date | — |
| Expiry date | Dec 15, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/003
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Prevention of inflow of water into the wells or shafts which are already drilled or are being drilled, by means of a polyacrylamide gel cross-linked with a dialdehyde is disclosed. An aqueous solution of non-hydrolyzed polyacrylamide, with a molecular weight higher than 2,000,000 and with a pH of at least 6.5, is used. A progressive plugging or clogging of the water-productive zone is obtained and the gel which is formed is stable over time and does not undergo any syneresis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.