Fast, feasible and safe method for evaluation of H2S Scavenger performance in acidizing laboratory

Hydrogen sulfide (H2S) is hazardous and toxic gas that leads to worker fatality. Nonetheless, hydrogen sulfide can also impair the formation permeability by creating precipitations that plug the pore throats.Therefore, removal of hydrogen sulfide content from formation or flow back fluids had become anecessity. Many research have been conducted to investigate techniques that can reduce hydrogen sulfide in wellbore or prevent of producing it, and one of these techniques is using hydrogen sulfide scavengers.In this paper have tried to discuss about scavengers in acid stimulation treatment and extend anexperimentally method to evaluate their performance. A simple, fast procedure was developed to evaluatehydrogen sulfide scavenger performance. Iron sulfide and Hydrochloric acid 10% was used to producehydrogen sulfide. The gas was transferred through the acid solution and the performance of the solution toscavenging the gas was evaluated due to the measurement of Cadmiun sulfate precipitation in next flask.Effect different parameters were investigated on the hydrogen sulfide capturing performance. The results show that a little change in temperature, pH and concentration of additives have significant effect on hydrogen sulfide capturing.

Keywords:

H2S scavenger , acid stimulation , triazine-based , aldehyde , FeS , acidizing additives