Attached is a reasonably interesting read on various scavenger chemistries and some of the advantages and disadvantages of each. (Available from Win Cubed)
Our preference has been to use chemicals that would form a stable and potentially irreversible reaction with the H2S, as well as ensuring both the product and by-products are also safe for personnel and also minimise any potential environmental hazards.
Based on this, we have looked to use Ferrous Gluconate based scavengers, but I believe the applications have primarily been in water based systems – i.e. safe disposal of water phase – as hydrocarbons are being flared.
The Bariod Sourscav is a scavenger that I understand to be based on the Ferrous Gluconate chemistry, but again for applications in water based systems (attached data sheet).
I do not know if Bariod has similar scavengers that would be effective in both the hydrocarbon fluid phases. I have not looked at these as we primarily burn/ flare off the hydrocarbons and associated H2S.
Hope some of this is useful, but would be interesting to get feedback on the final solution.
Global Well Testing Technical Specialist, BP