摘要：When drilling in sour gas reservoirs, chemical desulfurizer is added to drilling fluids to react with hydrogen sulfide to reduce the harmful concentration of hydrogen sulfide at home and abroad, however, the research on the conditions and effect of sulfur removal reagents in drilling fluid is not thorough enough. In this paper, the physical and chemical properties of two kinds of new type of sulfur removal material and common sulfur removal material are studied, and the effect of sulfur removal agent on the performance of drilling fluid is evaluated by experimenting. The effect of sulfur removal agent on desulfurization is also evaluated by conducting experiments at China Environmental Protection Product Quality Supervision and Inspection Center. Experiments have shown that the optimum drilling fluid pH values of sponge iron, basic zinc carbonate, composite sulfur removal agent and ferrous urate saccharate are 9, 11, 10 and 12 respectively. Sponge iron has the worst effect of removing hydrogen sulfide, while the compound sulfur removal agent and ferrous gluconate have a good effect. In the Zhongu well 6, the compound sulfur removal agent was used for on-site test, and the sulfur removal effect was obvious, which was consistent with the conclusion drawn in the laboratory.
