Method for quick quantitative analysis of metal cations in oil field water

A metal cation, quantitative analysis technology, applied in the direction of material analysis by chemical reaction of materials, material analysis by observing the influence of chemical indicators, etc., can solve the problems of increased measurement error, low accuracy, and troublesome operation. , to achieve the effect of high accuracy, reducing operation steps and increasing accuracy

Inactive Publication Date: 2017-08-18
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0003] The determination of cations in oilfield water mainly includes traditional complexometric titration and modern instrumental analysis methods, including ion chromatography and atomic spectroscopy, among which complexometric titration belongs to constant analysis with high accuracy, while ion chromatography and atomic spectroscopy belong to trace /trace analysis, although the sensitivity is high, the accuracy is relatively low. Therefore, the traditional complexometric titration method is generally used in the analysis of oilfield water samples, mai

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  • Method for quick quantitative analysis of metal cations in oil field water
  • Method for quick quantitative analysis of metal cations in oil field water
  • Method for quick quantitative analysis of metal cations in oil field water

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Embodiment

[0026] Embodiment A kind of rapid quantitative analysis method of metal cation in oilfield water, comprises the following steps:

[0027] 1) Pipette 10 mL of oilfield water sample into a 250 mL Erlenmeyer flask, add distilled water to a total volume of 50 mL, then add 10 mL of 0.1 mol / L nitric acid solution and 2 drops of 0.2% xylenol orange indicator , Titrate with 0.01mol / L EDTA standard solution until the solution turns from purple red to brown red, then add 1 drop of 0.2% xylenol orange indicator, the sudden change to bright yellow is the end point, record the volume of EDTA consumed 2.45mL;

[0028] 2) In the solution titrated in step 1), dropwise add a mass concentration of 4% NaOH solution, adjust the pH value of the solution to 3 to 4, then add 5mL, a mass concentration of 10% ammonium sulfate solution, fully stir to make The strontium and barium in the water sample are completely precipitated, add 2mL of absolute ethanol to inhibit the dissolution of the precipitate,...

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Abstract

The invention discloses a method for quick quantitative analysis of metal cations in oil field water. By complexometric titration, synchronous titration of calcium, magnesium, strontium, barium and iron in an oil field water sample is realized through solution acidity control and precipitation masking without special pretreatment. Due to reduction of steps of iron removal, heating, aging, filtering and diluting, operation steps are greatly reduced, operation time is greatly shortened, measurement result accuracy is improved, and operation efficiency is improved as well. The method is hopefully popularized and applied in oil field water quality analysis.

Description

technical field [0001] The invention relates to the field of oilfield water quality analysis, in particular to a rapid quantitative analysis method for metal cations in oilfield water. Background technique [0002] In the process of oilfield development, as the development time prolongs, the formation pressure gradually decreases, so water is injected into the reservoir through special injection wells to maintain or restore the reservoir pressure, so that the reservoir has a strong driving force, which is the key to improving the reservoir An important means and measure of the mining speed and recovery rate. Then, because the sources of injected water are generally more complex, including oil well produced water, surface water, shallow water, etc., the anion and cation contents in these different sources of water are also different, especially calcium, magnesium, strontium, barium, iron, etc. Ions, etc., if not analyzed and detected before injection, and properly treated, w...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 柯从玉孙妩娟路郭敏张群正张洵立
Owner XI'AN PETROLEUM UNIVERSITY
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