Oil treating for hydrogen sulfide and mercaptans under field conditions

Akhmet M. Mazgarov JSC "VNIIUS" Kazan, Russian Federation vniius@mail.ru
Azat F. Vildanov JSC "VNIIUS" Kazan, Russian Federation  
Fedor A. Korobkov JSC "VNIIUS" Kazan, Russian Federation  
Tatiana I. Komleva JSC "VNIIUS" Kazan, Russian Federation  
Irina K. Khrusheva JSC "VNIIUS" Kazan, Russian Federation  
Airat I. Nabiev Kazan Federal University Kazan, Russian Federation  
Presented the results of analysis of various means of oil treating for hydrogen sulfide and mercaptans (DMC type processes, chemical scavengers, treated gas stripping). Revealed are drawbacks of scavengers based on formaldehyde (toxicity, high corrosivity) at processing oil and associated petroleum gas.
Materials and methods
Laboratory and commercial tests on utilization of various neutralizers and DMC processes for oil treating for hydrogen sulfide and mercaptans onTengiz and Orenburg gas processing plants, Pokrovsk plant of OJS “Orenburgneft”, in Iran. Published data.
The main environmentally-safe methods of oil treating for hydrogen sulfide and mercaptans are treated gas stripping and DMC processes. Use of neutralizers is appropriate only when treating small volumes of oil with low hydrogen sulfide content. Use of formaldehyde-based neutralizers is unacceptable because of their high toxicity and oxidizability of formaldehyde to formic acid whichcauses severe corrosion at oil- and gas processing.
For the right choice of oil treating technology for H 2S and mercaptansis necessary to provide technical-and- economic analysis of technologies taking into account all individual parameters of each object.
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oil gas hydrogen sulfide mercaptan neutralizers (scavengers)of hydrogen sulfide DMC process formaldehyde