Abstract
Safe transport of sour gas involves the use of sulfide corrosion cracking resistant materials. Such materials can be expensive, so in some instances it may be more economical to use a hydrogen sulfide scavenger to remove hydrogen sulfide from the production fluid. Using a hydrogen sulfide scavenger can allow the use of less expensive materials. Conventional hydrogen sulfide scavengers such as triazines are not generally used downhole due to their high scaling tendency and low thermal stability. In many applications, conventional hydrogen sulfide scavengers exhibit slow kinetics resulting in the need to use a much higher amount than theoretical stoichiometry would dictate. A new test procedure was used to evaluate various candidate hydrogen sulfide scavengers and gain better understanding of the critical parameters that control the efficiency and kinetics of hydrogen sulfide scavengers in varied applications and conditions.
As a result, a new non-triazine based scavenger with high temperature stability and fast kinetics was recently developed for use in either oil or mixed production applications. This technology can either be used in direct injection applications top-sides or downhole injection via gas lift or umbilical. The improved kinetics of the new scavenger makes it especially useful for applications where the system residence time is low. The new scavenger has been tested for thermal stability and compatibility with metal, elastomers, plastics and other chemicals
