Process for increasing the water discharge of water delivering drilled wells, previously used for water delivery, and having decreased water discharge
US4541488A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Oct 14, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/528
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Process for increasing the water discharge of water delivering drilled wells, which can be characterized in that into the filter section of the well weak acids with a dissociation constant being less than K.sub.d =10.sup.-3 are introduced. After a dwelling period of longer duration, expediently 10 to 48 hours, as well as compressing, flushing is performed by means of a scavenging pump. Thereafter the solution of sodium bicarbonate and/or sodium hypochlorite is introduced into the filter section. After a longer dwelling period, expediently one to thirty-six hours, flushing is performed by means of the scavenging pump. As weak acids with a dissociation constant being less than K.sub.d =10.sup.-3 acetic acid, tartaric acid, citric acid, metaboric and/or tetraboric acid is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.