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<p>Hydrogen production from oil reservoirs through in situ combustion gasification is considered a promising technique for generating hydrogen for energy applications. The aquathermolysis reaction is initiated by in situ combustion, which contributes to hydrogen production from crude oil within the reservoir. However, this approach has not been widely studied. The effects of deionized water and formation brine on hydrogen generation from in situ combustion gasification of crude oil in oil reservoirs were examined by introducing crude oil–water (O/W) and crude oil–brine (O/B) emulsions into a fixed-bed micro-activity test unit over a temperature range of 300–600&#xa0;°C. Experimental results showed that increasing the volume fraction of deionized water in the O/W emulsion from 30 to 50% led to a reduction in hydrogen yield by approximately 44% at 600&#xa0;°C. At 300 and 400&#xa0;°C, the amount of hydrogen was minimal. Additionally, coke formation was suppressed as the water ratio increased at 500&#xa0;°C, but coke production rose again at 600&#xa0;°C. It was also noticed that the presence of monovalent and divalent salts in formation brine enhanced hydrogen generation from the O/B emulsion compared to the O/W emulsion at equivalent water concentration. Furthermore, scanning electron microscopy images obtained from the O/B emulsion at 600&#xa0;°C revealed particle deposition on the coke surface, which was confirmed to be from the brine salt. These findings provide a deep insight into the influence of formation brine on the hydrogen generation during in situ gasification of crude oil in the reservoir.</p>

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In Situ Hydrogen Generation from Crude Oil Aquathermolysis: The Effect of Deionized Water and Formation Brine

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Mohamed Abdalsalam Hanfi,
  • Abdulkadir Tanimu,
  • Mohamed Mahmoud,
  • Arshad Raza,
  • Medhat A. Nemitallah,
  • Dhafer Al Shehri,
  • Sulaiman A. Alarifi

摘要

Hydrogen production from oil reservoirs through in situ combustion gasification is considered a promising technique for generating hydrogen for energy applications. The aquathermolysis reaction is initiated by in situ combustion, which contributes to hydrogen production from crude oil within the reservoir. However, this approach has not been widely studied. The effects of deionized water and formation brine on hydrogen generation from in situ combustion gasification of crude oil in oil reservoirs were examined by introducing crude oil–water (O/W) and crude oil–brine (O/B) emulsions into a fixed-bed micro-activity test unit over a temperature range of 300–600 °C. Experimental results showed that increasing the volume fraction of deionized water in the O/W emulsion from 30 to 50% led to a reduction in hydrogen yield by approximately 44% at 600 °C. At 300 and 400 °C, the amount of hydrogen was minimal. Additionally, coke formation was suppressed as the water ratio increased at 500 °C, but coke production rose again at 600 °C. It was also noticed that the presence of monovalent and divalent salts in formation brine enhanced hydrogen generation from the O/B emulsion compared to the O/W emulsion at equivalent water concentration. Furthermore, scanning electron microscopy images obtained from the O/B emulsion at 600 °C revealed particle deposition on the coke surface, which was confirmed to be from the brine salt. These findings provide a deep insight into the influence of formation brine on the hydrogen generation during in situ gasification of crude oil in the reservoir.