An Experimental Investigation of H2S Production by Thermochemical Sulfate Reduction in Heavy Oil

doi:10.11885/j.issn.1674-5086.2018.06.01.01

Abstract

Abstract: The mechanism of H₂S formation during heavy oil recovery by steam injection was investigated by reacting five sulfates (Na₂SO₄, CaSO₄, MgSO₄, Fe₂(SO₄)₃, and Al₂(SO₄)₃) with heavy oil via thermochemical sulfate reduction(TSR). Significant variations were observed in the production of H₂S depending on the type of sulfate reacting with the heavy oil, as the number of charges carried by the sulfate cation governed the ease of the TSR reaction. More strongly charged sulfate cations facilitated the TSR reaction. The H₂S yields of the sulfates followed the order:Al₂(SO₄)₃ > Fe₂(SO₄)₃ > MgSO₄ > CaSO₄ > Na₂SO₄. However, the hydrocarbon yields were as follows:Fe₂(SO₄)₃ > Al₂(SO₄)₃ > MgSO₄ > CaSO₄ > Na₂SO₄. Fe₂(SO₄)₃ is unique among the sulfates as it can react with H₂S due to its oxidizing property. The solid-state Fourier transform infrared spectroscopy (FTIR) analyses showed that FeS₂ was present in addition to several metal oxides (CaO, MgO, Fe₂O₃, and Al₂O₃). Finally, the sulfur content of the oil phase with the TSR reaction of MgSO₄ was analyzed, and it was demonstrated that the post-TSR sulfur content of the oil phase was higher than that of crude oil. This confirmed that inorganic sulfur was converted to organic sulfur during the TSR reaction in heavy oil.

Key words: heavy oil, TSR, H₂S, thermochemistry, mechanism

CLC Number:

TE345

MA Qiang, LIN Riyi, HAN Chaojie, YUAN Gaoliang, YU Wanmin. An Experimental Investigation of H₂S Production by Thermochemical Sulfate Reduction in Heavy Oil[J]. 西南石油大学学报(自然科学版), 2019, 41(4): 175-182.

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An Experimental Investigation of H₂S Production by Thermochemical Sulfate Reduction in Heavy Oil

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