Étude expérimentale et modélisation des interactions entre H2S et les hydrocarbures. Formation de composés organo-soufrés et effets cinétiques en gisement

Abstract : H2S can be a dominant gas in carbonate petroleum reservoirs. However, researches on the influence of H2S on the oil stability are limited in literature. In this thesis, interactions between hydrocarbons (oils, model compounds) and H2S were studied by confined pyrolysis in gold cells from 310 to 350°C under 700 bar. Results of pyrolysis of oil (free of sulfur) in presence of H2S lead to highlight a new pathway of formation of organic sulfur compounds in oils. Pyrolysis of binary mixtures n-octane/H2S and alkylbenzène/H2S allowed to propose different radical reactions for the generation of main sulfur products, namely, thiophene, thiols, thiacycloalkanes, alkyl-thiophenes in the first case ; thiol-aromatics, alkyl-benzothiophenes in the second. Results obtained in the mixture n-octane/H2S led to construct and validate a detailed mechanistic model. The mechanism shows that pyrolysis of n-octane/H2S occurs in long chain and H2S has an inhibition effect on the consumption of n-octane at temperatures above of 320°C, but accelerate the reaction rate strongly at low temperatures. Extrapolation of the kinetic model to geological temperatures and pressures (150-200°C, 700 bar) shows that H2S can significantly influence the composition and stability of hydrocarbons. It is also proposed to apply the model to study the reactivity of H2S under conditions of enhanced recovery (steam injection, pyrolysis) or of geological storage in depleted petroleum reservoirs
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van Phuc Nguyen. Étude expérimentale et modélisation des interactions entre H2S et les hydrocarbures. Formation de composés organo-soufrés et effets cinétiques en gisement. Alimentation et Nutrition. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0292⟩. ⟨tel-01749468⟩

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