METHOD OF DETERMINING CONTENT OF SULPHIDES IN DEPOSITS IN OIL-FIELD EQUIPMENT Russian patent published in 2020 - IPC G01N31/16 G01N33/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to development and operation of oil deposits. Method provides antioxidant treatment of samples taken for analysis of 5-8 % solution of ascorbic acid, subsequent treatment of suspended sample with 20 % hydrochloric acid in apparatus for determining hydrogen sulphide in nitrogen atmosphere, which is passed through bubbler, providing its controlled supply and continuous filling of plant, distillation of released hydrogen sulphide H₂S and calculation of its total amount by results of iodometric titration. Calculation of percentage content of sulphide ions in sample is carried out by formula: [S^2-]%=[H₂S]⋅0.016, where [H₂S] – amount of mg-equivalents of hydrogen sulphide in 100 g of sediment sample; 0.016 is weight of one mg-equivalent of sulphide-ion, and calculation of iron sulphide concentration by formula: [FeS]%=[H₂S]⋅0.044, where 0.044 – weight 1 mg-equivalent of iron sulphide.

EFFECT: higher accuracy of analysis with simultaneous improvement of safety measures.

1 cl, 1 dwg, 2 ex