Applied research on domestic MCS chelated iron desulfurization process in Western Sichuan marine sour gas reservoir

Western Sichuan marine gas reservoir is in the exploration and development evaluation stage at present. The natural gas contains 0.7%-5% hydrogen sulfide, which needs the single well desulfurization test mining and gas reservoir evaluation. The tracking analysis of the first oral production well (Chuanke 1) using MCS domestic chelated iron desulfurization process was carried out. Aiming at the environmental protection and sulfur plugging problems, the desulfurization process was adjusted and optimized, the suggestions for process popularizing were put forward, and the operating energy consumption and costs were calculated. Currently the operating time of MCS chelated iron desulfurization unit is over 8 000 h per year, sulfur ointment production is 4 t/d, and the cumulative production of natural gas is 85×10⁶ m³, which increase about 6.25×10⁶ m³ per year compared with the annual output of natural gas before optimization. It ensures the successfully test mining of the well and the effective evaluation of Western Sichuan marine gas reservoir, which can provide references for the production test of similar sour gas well.