Hydrogen sulfide (H2S) is often present in oil and gas production fluids. The gas is toxic, corrosive to mild steel and induces localized sulfide corrosion cracking (SCC) in materials with susceptible metallurgical properties Treatment with H2S scavengers can enable the use of less-expensive low alloy carbon steel materials.

Triazines and glyoxal are commonly used H2S scavengers in oil and gas production. In some instances they are used to reduce H2S levels to safe values and make the installation safer. There are problems with the use of trazine and glyoxal.

Triazines especially Monoethanol amine Triazines (MEA-Triazine) are well used but have some problems with solid formation and creation of corrosion problems in refineries MEA-triazine reacts with H2S to create an insoluble reaction product known as amorphous diathiazine that is difficult to remove.

Sometimes refineries ban or discount crude oil that contains triazine. The reason they do this is that the presence of triazine in crude can cause downstream corrosion problems in crude distillation overhead lines and crude unit.

Glyoxal is a hydrogen sulfide scavenger that does not contain nitrogen. This product does not cause corrosion problems in refineries due to formation of amine salts. Glyoxal though has a low pH that can result in corrosion at any location where oil and water can separate and glyoxal causes the water phase to have a low pH..

Due to the problems with nitrogen containing H2S scavengers, and glyoxal, some customers have asked for non-nitrogen containing, non-corrosive H2S scavengers. This paper presents laboratory results on a new, non-corrosive, non-Nitrogen containing H2S scavenger. The new scavenger has a pH in the range of 7.5 to 8.5 that does not form problematic solids on reaction with H2S. The product has been used in towers and direct injection in wet gas systemsThe product is not water-based and can be used in dry oil and dry gas and condensate systems.

The successful use of this product in wet systems has been described in previous work but is included for completeness in this paper. Some of the more successful field results include application of the product to a dry oil system and a dry gas and condensate system. This is useful for cases where the operator wishes to decrease the H2S content of a dry oil and dry gas and condensate pipeline without introducing water in the application. This is not possible with products that contain water.

Subject
Hydrogen sulfide scavengers, Water, Viscosity, Hydrogen concentration, Reaction products, Solids, Triazines, Bottles, Nitrogen, Metals, Crude, Towers, Oil
Keywords:
Sour Corrosion, H2S Scavenger, Sulfide Stress Cracking Corrosion, Health, Safety and Environment
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2020
Association for Materials Protection and Performance (AMPP)
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