h2s resistant high-performance elastomers for use in sour wells

Oil wells with more than 0.5 percent h2s are categorized as sour wells. harsh media specially h2s is a challenge in sour wells operations. in this paper, behavior of three of most conventional oil field elastomers have been investigated against h2s with molar concentrations between 0 to 5 percent. for camparison, physical properties and swell behavior are measured pre and post immersion. fkm shows excellent results in all tests, hnbr is accebtable for applications under 2 percent h2s and also is better to use for short time services, but nbr is not a good choice at all in high temperature sour media.