The chloride ions constitute a significant proportion of the ion content in oilfield water.Measuring the chloride ion content in oilfield water during the production process can effectively monitor the production dynamics of oil and gas fields,providing an accurate and scientific basis for subsequent oilfield injection and production operations.At the same time,it is also important to ensure the accuracy,reliability,and validity of analysis data.The silver nitrate(AgNO3)titration method is used to determine the chloride ion content in oilfield water samples,and the sources of uncertainty in the measurement results are identified,such as measurement repeatability,purity of standard KCl,weighing and volumetric calibration,volumetric measurement of the standard solution in titration and calibration,temperature,etc.A mathematical model is then established to calculate the uncertainty components and relative uncertainty components of each input quantity.The variance of each relative uncertainty component is combined,and the combined standard uncertainty is calculated.The final measurement result is expressed as(6,373.09±216.68)mg/L(k=2),and the uncertainty of the measurement result's repeatability has the greatest impact on the overall uncertainty.
uncertaintychloride ion in oilfield watersilver nitrate titrationwell HY7
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