Drilling fluid composition and method for removing hydrogen sulfide content using the same

A drilling fluid composition, comprising:

• an aqueous base fluid;
• at least one additive selected from the group consisting of an anti-foaming agent, a fluid-loss additive, a viscosity modifier, a shale stabilizer, an alkali compound, a bridging agent, and a weighting agent;
• 0.01 to 0.5 wt. % of particles of steel slag, based on a total weight of the drilling fluid composition, wherein the steel slag particles have an irregular shape, and an average particle size (D50) in a range of 5 to 20 μm;
• 0.01 to 0.1 wt. % of the anti-foaming agent selected from the group consisting of polydimethylsiloxane, fatty acid ester, silicon dioxide, and vegetable oil;
• 0.01 to 0.5 wt. % of the viscosity modifier selected from the group consisting of a clay, a saccharide, a polysaccharide, a cellulose, an acrylate polymer and copolymer, and a polyvinyl polymer and copolymer;
• 0.5 to 5 wt. % of the fluid-loss additive selected from the group consisting of a starch, a starch derivative, a cellulose, and a cellulose derivative;
• 5 to 20 wt. % of the shale stabilizer selected from the group consisting of a sodium salt, and a sulfonated asphalt;
• 0.01 to 0.5 wt. % of the alkali compound selected from the group consisting of caustic soda and soda ash;
• 1 to 10 wt. % of the bridging agent selected from the group consisting of sodium borate, boric oxide, calcium carbonate, and magnesium oxide;
• 20 to 40 wt. % of the weighting agent selected from the group consisting of barite and hematite;
• and
• 45 to 65 wt. % of the base fluid, each wt. % based on a total weight of the drilling fluid composition.