Downhole hydrogen sulfide scavenging in drilling mud using iron chelates
US4756836A · kind A · utility
10Cited by
10References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1986 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | May 7, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/035
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
For drilling mud during use in drilling a well an additive of FE Chelate is disclosed. The chelating agent preferably includes EDTA, HEDTA, NTA, or DTPA. It is oxygen regenerated at the surface to enable repeated use to remove H.sub.2 S. Any H.sub.2 S is converted to elemental sulfur, reducing risk of poisoning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.