The inhibitors of inorganic mineral sediments based on orthophosphate acid, monoamid of sulphuric acid (MSA) and carboxymethylcelluloze (CMC) have been developed. Created compositional inhibitors of salt deposition are transparent, fluid water solution with 14.5–22.0 % concentration. To specify the efficiency of developed salt deposition inhibitors, the agent capacity to keep cations of calcium in the volume of artificially prepared mineral waters of carbonate and sulphate types modelling produced water within oil fields has been evaluated. It was defined that adding 20–20 mg/l of developed compositions into the solutions of calcium sulphate provides high protection effect. Inhibitors’ protection capacity using the compositions in the charge of 20 mg/l in sulphate water comprises 89.6–96.8 %, and in the carbonate water - 87.8–92.6 %. Using 25 mg/l of these compositions, protection capacity of the inhibitors in sulphate water reaches up to 94.5–98.7 %, and in carbonate water - 92.5–96.8 %. Protection effect of inhibitors in case of using 30 mg/l of the compositions comprises 98.3–100 % in sulphate water, and 96.8–100 % in carbonated one as well.