离子色谱法测定油田水中Cl^(-)、SO_(4)^(2-)含量不确定度的评定及改进  

Uncertainty Evaluation and Method Improvement for Determination of Cl^(-),SO_(4)^(2-)in Oilfield Water by Ion Chromatography

作　　者：汤雨霖 刘卫丽[1,2] 闫旭 陈霞 孙强 Tang Yulin;Liu Weili;Yan Xu;Chen Xia;Sun Qiang(China Oilfield Services Limited,Tianjin 300459 China;Tianjin Key Laboratory of Offshore Oil Environment and Low Damage Drilling and Completion Fluid for Reservoir,Tianjin 300450,China)

机构地区：[1]中海油田服务股份有限公司,天津300459 [2]天津市海洋石油环境和储层低伤害钻完井液企业重点实验室,天津300459

出　　处：《广东化工》2024年第11期173-175,共3页Guangdong Chemical Industry

基　　金：中海油田服务股份有限公司科研课题:油田化学品核心控制指标体系研究(YHB_(2)2YF004)。

摘　　要：利用离子色谱法进行油田水中无机离子含量的测定操作简便,分析结果准确,在油田化学行业检测实验室中得到了广泛应用。但测试过程中不可避免地会引入不确定度。依据CNAS-CL01:2018《检测和校准实验室能力认可准则》的要求,所有从事检测的实验室都必须进行测量不确定度的评定。本研究参考了CNAS-GL006:2019《化学分析中不确定度的评估指南》建立离子色谱法测定油田水中Cl^(-)、SO_(4)^(2-)含量的不确定度评定方法。依据SY/T 5523-2016《油田水分析方法》进行采样、运输和保存,依据GB/T 14642-2009进行油田水中Cl^(-)、SO_(4)^(2-)的测定,建立测量模型,确定不确定度来源,对各个不确定度分量进行评定,并计算合成标准不确定度。在95%置信区间下,油田水样品检测结果显示:Cl^(-)含量为(10.99±0.10)mg·L^(-1),SO_(4)^(2-)含量为(14.05±0.08)mg·L^(-1)。标准溶液配制过程中引入的相对标准不确定度和平行样重复性测定引入的相对标准不确定度较大,是提高该测定结果准确度的关键。Ion chromatography simplifies the process of measuring inorganic ions in oilfield water,delivering accurate results.This method is extensively employed in testing labs within the oilfield chemical sector.Nonetheless,the testing phase invariably introduces certain uncertainties.In compliance with CNAS-CL01:2018,which sets forth the“Criteria for Accreditation of Testing and Calibration Laboratories”,it's imperative for labs to assess the measurement uncertainty.This study,adhering to CNAS-GL006:2019's“Guidance on the Evaluation of Uncertainty in Chemical Analysis”,devises an uncertainty evaluation method for Cl^(-)and SO_(4)^(2-)content measurement in oilfield water using ion chromatography.Following the protocols outlined in SY/T 5523-2016 for oilfield water analysis(sampling,transport,and preservation)and GB/T 14642-2009 for determining Cl^(-)and SO_(4)^(2-)in such water via ion chromatography,we establish a measurement model.This involves identifying uncertainty sources,assessing each uncertainty component,and calculating the combined standard uncertainty.The findings for the oilfield water samples,within a 95%confidence interval,reveal Cl^(-)levels at(10.99±0.10)mg·L^(-1) and SO_(4)^(2-)levels at(14.05±0.08)mg·L^(-1).The key to enhancing the precision of these measurements lies in addressing the significant relative standard uncertainties encountered during standard solution preparation and the repeatability of parallel sample testing.

关 键 词：离子色谱 油田水分析方法 不确定度 Cl^(-) SO_(4)^(2-) 

分 类 号：O657.7[理学—分析化学]