阻垢剂性能评定中络合滴定方法的改进  

An Improvement in Complexometric Titration for Evaluating the Efficiency of Scale Inhibitors

作　　者：冯改宁[1] 陈玉娥[1] 朱丽华[1] 李友清[1] 祖荣 唐和清[1] 

机构地区：[1]华中科技大学化学系,湖北武汉430074 [2]南海西部振海油田化学公司,广东湛江524057

出　　处：《油田化学》2004年第3期284-286,296,共4页Oilfield Chemistry

基　　金：华中科技大学研究生创新基金资助。

摘　　要：对络合滴定法测定混合成垢阳离子Ca2+、Mg2+、Ba2+、Sr2+总浓度和单一成垢阳离子Ba2+或Sr2+浓度所得结果的准确度进行了实验考察。当用石油天然气行业标准SY5523 92规定的EDTA直接络合滴定法测定4种阳离子总浓度时,随着水样中Mg2+浓度的降低,测定结果的相对平均偏差(精确度)变化不大,但相对误差(准确度)逐渐增大,Mg2+浓度为零时高达33.2%;用直接滴定法测定单一Ba2+或Sr2+浓度时,相对平均偏差较大,相对误差则很大。当混合阳离子中Mg2+浓度低或为零或测定单一Ba2+或Sr2+时,在一定量的Mg EDTA存在下用反滴定法可获得令人满意的测定结果。图4表3参3。The accurancy of determinations of total concentration of scaling cations Ca^(2+), Mg^(2+), Ba^(2+), and Sr^(2+) and of concentration of single cation Ba^(2+) or Sr^(2+) (by) EDTA-complexometric titration is studied experimentally. For the determinations of total concentration of the 4 cations obtained by direct titration, which is recommended for evaluating scale inhibitors in an oil/gas industry trade standard, SY 5523-93, with decreasing Mg^(2+) concentration the deviation from mean is less changeable but the relative error increases notably, being of 33.2% at null Mg^(2+) concentration. In determining single Ba^(2+) or Sr^(2+) by direct titration the deviation from mean of the determinations is not small and the relative error— very large. Satisfactory results of analysis can be obtained in the cases when Mg^(2+) concentration in the water samples containing mixed scaling cations is low or null or when single cation Ba^(2+) or Sr^(2+) is to be determined by using inverse complexometric titration at the presence of some amount of mg-EDTA.

关 键 词：阻垢剂 络合滴定方法 浓度 地层 结垢现象 动态模拟法 

分 类 号：TE358.5[石油与天然气工程—油气田开发工程] TE39