Techno-economic and environmental assessment of hydrogen utilization system based on different demand scenarios: An oil and gas field case.

In this work, an integrated system for hydrogen energy utilization system (HUS) in oil and gas fields was constructed focusing on two scenarios: hydrogen fuel cell bus and industrial combustion. The energy consumption, environmental, economic, and energy efficiency were assessed for the various HUS technological pathways associated with produced water treatment, hydrogen production, transport and storage, refueling, and utilization. The entropy weight-TOPSIS method was utilized to assess the optimal pathway. The results indicate that the pathway of alkaline water electrolysis for hydrogen production and pipeline transportation to gas-hydrogen refueling stations for hydrogen fuel cell bus shows excellent comprehensive indicators, which has an energy consumption of 197.15 MJ/kgH 2 , the levelized cost of hydrogen (LCOH) of 6.70 USD/kgH 2 , a system energy efficiency of 30.43%. For industrial combustion, the best pathway is alkaline water electrolysis for hydrogen production and pure H 2 pipeline transportation. Sensitivity analyses were conducted to explore the impact of different factors on LCOH. As the electricity price decreases to 0.014 USD/kWh, LCOH will reduce by 2.50 USD/kgH 2. The reduction in electricity prices will further increase the feasibility of hydrogen energy in the future. • The Hydrogen utilization system (HUS) in oil and gas fields was proposed. • The technical-economic and environmental performance of HUS were analyzed. • The entropy-weighted TOPSIS method is used to select the optimal pathway. • Alkaline water electrolysis and pipeline transportation are the best pathways. • Electricity prices are the most sensitive factor to LCOH. [ABSTRACT FROM AUTHOR]