Well repair for in situ leaching
US4386806A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1981 |
| Grant date | Jun 7, 1983 |
| Priority date | — |
| Expiry date | Feb 23, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A permeable region adjacent a well bore used in an acidic in situ leaching system can be repaired by introducing a non-acidic liquid for displacing acidic leach liquid from the permeable region, introducing into the well bore a basic composition including a polymeric material that gels under acidic conditions, and applying sufficient pressure to the well bore to displace at least a portion of the basic composition and polymeric material from the well bore into the permeable region adjacent the well bore. Liquid flow in the well bore is then discontinued for a sufficient time for acid remaining in the subterranean formation adjacent the well bore to contact such polymeric material and cause gelation of the polymeric material in the permeable region. The introduction of acidic leach liquid can then continue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.