Oil-field water injection well descaling agent and preparation method thereof

The invention discloses an oil-field water injection well descaling agent and a preparation method thereof, and belongs to the technical field of oil field exploitation. The oil-field water injection well descaling agent is used for removing scale formed on a water injection well pipe wall in water-injection development so that water-injection efficiency is improved. The oil-field water injection well descaling agent comprises, by weight, 5-15% of hydrochloric acid (having a concentration of 28-38%), 0.1-1.5% of sodium acetate, 0.1-1.5% of sodium citrate, 0.1-8.5% of sodium fluoride, 1-6% of potassium sodium tartrate, 0.05-0.5% of rosin-polythylene oxide ester, 0.05-0.4% of nekal BX, 0.2-1.5% of sodium di-sec-octylmal-eacesulfonate, 0.1-0.6% of solid chlorous anhydride, 0.5-1.5% of hydroxy ethidene diphosphonic acid and the balance water. The oil-field water injection well descaling agent can effectively remove carbonate scale, sulfate scale, ferrous sulfide scale, grease stain and silicate scale in the water