H.sub.2 S abatement with stabilized chelates in geothermal drilling
US5096691A · kind A · utility
9Cited by
25References
32Claims
0Family size
Inventor
Key dates
| Filing date | Jan 9, 1989 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Jan 9, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/05
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
H.sub.2 S abatement in geothermal drilling operations (e.g. drilling, flow testing and reworking) with a ferric aminocarboxylic acid chelating solution containing a stabilizer and an optional cationic polyelectrolyte catalyst which is injected in the blooie line of the well upstream of the separator. The stabilizer is a hydroxyl radical scavenger such as iodide, nitrite, amino acid, aliphatic aldehyde, sugar, ascorbate, formate and/or aryl sulfonic acid, and inhibits degradation the ferric aminocarboxylic acid complex.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.