Causes and treatment of H2S in offshore ultra-heavy oil thermal recovery wells
During the steam huff and puff development process of the Bohai L Oilfield,a high concentration of hydrogen sulfide is generated,which poses a great safety hazard to the platform.By conducting sulfur content and high-temperature and high-pressure thermal simulation experiments,the source of sulfur in hydrogen sulfide and its relationship with crude oil,reservoir minerals,formation water,and temperature are analyzed.At the same time,combined with the limited space of offshore platforms and the characteristics of steam huff and puff processes,supporting measures for hydrogen sulfide treatment are formed.The results indicate that the main source of sulfur elements in the hydrogen sulfide produced during the steam huff and puff process of the Bohai L Oilfield is crude oil,followed by the sulfate ions in the formation water.The formation of hydrogen sulfide is controlled by the temperature and the concentration of sulfate ions in the formation water.The developed desulfurizer and miniaturized desulfurization device can meet the treatment needs of hydrogen sulfide during the blowout and production process of offshore thermal recovery wells,ensuring the safety of production in offshore oil fields.
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