硝酸银滴定法测量油田水中氯离子含量的不确定度评定——以HY7井为例  

Uncertainty assessment of measuring chloride ion content in oilfield water by sliver nitrate titration method:A case of well HY7

作　　者：杨雅雅 YANG Yaya(Exploration and Development Research of Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China)

机构地区：[1]中国石化江苏油田分公司勘探开发研究院,江苏扬州225009

出　　处：《复杂油气藏》2024年第4期444-448,454,共6页Complex Hydrocarbon Reservoirs

摘　　要：油田水离子含量中氯离子占比较大,测量油气田生产过程中油田水的氯离子含量能够很好地监测油气田生产动态,为后期的油田注、采工作提供精准科学的依据,同时如何确保分析数据的准确性、可靠性和有效性也相当重要。采用硝酸银(AgNO3)滴定法测定油田水样品中氯离子含量,对测定结果的不确定度来源进行识别,如测量重复性、标准KCl的纯度、称量和定容、标准溶液在滴定和标定时滴定管的体积计量、温度等,然后建立数学模型,分别计算各输入量的不确定度分量和相对不确定度分量,合成各相对不确定度分量的方差和合成标准不确定度计算。最终测量结果表示为:(6373.09±216.68)mg/L(k=2),测量结果重复性的不确定度对总体不确定度作用最大。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.

关 键 词：不确定度 油田水氯离子 硝酸银滴定法 HY7井 

分 类 号：TE135.4[石油与天然气工程—油气勘探]