Hydrogen Sulfide Scavengers

Details

A major production challenge in oil and gas systems is the presence of hydrogen sulfide (H2 S). H2 S may be present in the reservoir “naturally” or it may be present in the production system due to the presence of sulfate reducing bacteria (SRB) which take in sulfate and generate hydrogen sulfide. H2 S is highly reactive, especially with iron, and in most systems the H2 S will readily react with iron in ionic form or iron from metal surfaces, to form various species of iron sulfide (FeS). SRB colonies adhering to pipe walls can become iron sulfide factories, eating away at the pipe surface and forming pits which eventually cause leaks and failures.

Left untreated, systems with H2S will generate FeS, which leads to other major operational challenges and costs because of the subsequent production issues it causes including:

• Scale
• Interface problems
• Filter and reservoir plugging
• Water discharge concerns
• Lost production

If the water is being reused for stimulation or fracturing, the water must be conditioned to remove the FeS, which adds operational costs.

Water Technologies & Solutions offers several methods to attack H2S and FeS in your system.

Biocides: If the source of H2S/FeS is bacteria,
it’s important to eliminate the bacteria in your
system. Sessile (attached) colonies require
special biocides to penetrate the biofilm and kill
established colonies. These colonies are localized
and cause damage to tubing, leading to failures and
environmental issues. Planktonic bacteria, traveling
with the fluid in a system, either sours a system
or it reacts with available iron to form FeS. Either
way, these bacteria have to be eliminated with the
appropriate biocides.

H2S scavengers: For high levels of H2S in a system,
a good scavenger will help reduce the threat of FeS
generation and corrosion. Our H2S scavengers will:

• Eliminate H2S and FeS in your system
• Improve overall safety and reduce
environmental risk
• Reduce the risk of corrosion failures and improve asset integrity
• Meet pipeline and sales specifications all the time
• Improve safety