Durabilité des matériaux de puits pétroliers dans le cadre d'une séquestration géologique de dioxyde de carbone et d'hydrogène sulfuré

Abstract : The geological sequestration of carbon dioxide (CO2) and hydrogen sulphide (H2S) is a promising solution for the long-term storage of these undesirable gases. It consists in injecting them via wells into deep geological reservoirs. The steel and cement employed in the well casing can be altered and provide pathways for leakage with subsequent human and environmental consequences. The materials ageing was investigated by laboratory experiments in geologically relevant P-T conditions. A new experimental and analysis procedure was designed for this purpose. A numerical approach was also done. The cement and steel were altered in various fluid phases at 500 bar-120ÊC and 500 bar-200°C: a brine, a brine saturated with H2S-CO2, a mixture of brine saturated with H2S-CO2 and of supercritical H2S-CO2 phase, a dry supercritical H2S-CO2 phase without liquid water. In all cases, two distinct reactions are observed: the cement carbonation by the CO2 and the steel sulphidation by the H2S. The carbonation and sulphidation are respectively maximal and minimal when they occur within the dry supercritical phase without liquid water. The textural and porosity properties of the cement are weakly affected by all the treatments at 120°C. The porosity even decreases in presence of H2S-CO2. But these properties are affected at 200°C when liquid water is present in the system. At this temperature, the initial properties are only preserved or improved by the treatments within the dry supercritical phase. The steel is corroded in all cases and thus is the vulnerable material of the wells.
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Nicolas Jacquemet. Durabilité des matériaux de puits pétroliers dans le cadre d'une séquestration géologique de dioxyde de carbone et d'hydrogène sulfuré. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10015⟩. ⟨tel-01754381⟩

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