Method for detecting barium ions in oil field water

Abstract

The invention discloses a method for detecting barium ions in oil field water. The method comprises the following steps: taking an oil-water sample; adding hydrochloric acid solution and methyl red indicator into the sample; adjusting the solution to yellow by ammonia solution; adding acetic acid-ammonium acetate buffer solution into the mixture; heating and boiling the mixture; dripping potassium chromate solution into the mixture; boiling the mixture once more; adding the acetic acid-ammonium acetate buffer solution into the mixture; standing the mixture to room temperature; filtering and abandoning initial filtrate; taking the filtrate; adding distilled water into the filtrate; adding potassium iodide and sulfuric acid solution into the mixture; shaking the mixture evenly, and placing the mixture in a dark position; titrating the mixture by sodium thiosulfate standard solution; adding starch indicating solution into the mixture; recording consumption V of the sodium thiosulfate solution; and calculating the concentration of the barium ions in the oil field through the formula of the consumption V0 of the recorded sodium thiosulfate solution. By adopting the method for detectingthe barium ions, the concentration of the barium ions in the oil field can be accurately and precisely detected, and the requirement of quick and accurate analysis on scaling ions Ba<2+> can be met.

Description

technical field The invention belongs to the technical field of oil and gas descaling, in particular to a method for measuring barium ions in oil field water. Background technique Oilfield produced water contains Ba 2+ At present, the anti-scaling measures of chemical agents are taken, and the anti-scaling effect of chemical agents needs to be monitored, and the scale-forming ion analysis and determination should be carried out. Ba 2+ The analysis methods generally include complexometric titration, chromate volumetric method, iodometric method, gravimetric method, ion chromatography and atomic absorption spectrophotometry. The field application of these traditional analysis and determination methods still has some shortcomings, such as the complexometric titration takes at least 6 hours, the analysis steps are cumbersome, and the Ba 2+ and Sr 2+ The total amount, and only suitable for the determination of barium ions with a content greater than 100mg / l; the chromate volu...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to solve the problem of low test accuracy and slow speed in the determination of barium ions in oil field water, and provide a test method with simple process, convenient operation, and the ability to quickly and accurately measure barium ions on site

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