Abstract: Aiming at the issues of low sulfur capacity, poor temperature resistance and scaling tendency of triazine desulphurizer in the treatment of sour oil wells, a novel DS desulphurizer system has been developed. This system exhibits higher sulfur capacity, better temperature resistance and stronger anti-scaling properties, which can reduce desulfurization costs by approximately 30%. Four hydrogen sulfide treatment processes including casing drip addition and downhole injection were developed in parallel. Catalytic oxidation desulfurization at the wellhead achieved an efficiency of over 95%. To date, it has been applied in over 800 well applications and the wellhead hydrogen sulfide content has been stably controlled below 20 mg/m3 (below the national standard limit). This has ensured operational safety and environmentally friendly development.

Key words: hydrogen sulfide treatment, oil well corrosion protection, desulphurizer, safe and environmental protection technology