关于标准“GB/T 16783.1—2014/ISO 10414:2008”执行中存在问题及修正建议

Problems Existed in Executing the Standard “GB/T 16783.1 – 2014/ISO 10414:2008” and Suggestions for Correction

液相成分的测定与分析是指导钻井工程安全作业的重要操作之一,实践中发现,采用“GB/T 16783.12014/ISO 10414:2008”标准进行Ca^2+、Mg^2+、K^+含量测定时,由于无明确的滴定终点显现和离心沉淀物数量读取存在无法避免的人为误差等问题,导致操作无法完成或测定结果与实际情况相差较大的情况。为了消除这些问题,提高测量精度,在结合现场和实验室两方面操作数据基础上,对“GB/T 16783.12014/ISO 10414:2008”标准中相应操作内容提出了修正建议。实验结果显示,对有关操作内容进行合理修改后,能够有效减少误差积累环节,提高数据测量精度。5口井的K^+含量测定对比结果表明,采用“C-m”法替代“C-V”法后,得出的测定结果与现场实际情况相符合,与标准中推荐的“C-V”法相比,“C-m”法具有更好的可操作性,并且彻底消除了人为误差,是一种能够得到准确结果的实验操作方法。

Liquid phase measurement and analysis is one of the important measures to ensure safe drilling operations.It was found in field practices that in the measurement of Ca^2+,Mg^2+ and K^+ using the standard “GB/T 16783.1 2014/ISO 10414:2018” is unable to perform or the measurement results are quite different than the actual situation because of lack of clearly defined titration endpoint and inevitable manmade errors in reading the amount of centrifuged precipitates.To eliminate these problems and to improve the precision of measurement,it is suggested that the standard “GB/T 16783.1 2014/ISO 10414:2018”be corrected using the data collected from filed practice and laboratory experiment.Laboratory experiment results show that,after correction,the cumulative errors in the measurement is effectively minimized and the measurement precision improved.K^+ ion concentration data from 5 wells show that after replacing the “C-V method” with “C-m method”,the measured K^+ concentration matches the actual K^+ concentration.Compared with the “C-V method”,the “C-m method” has better operability and completely eliminates manmade errors of measurement.It is thus concluded that the “C-m method” is a method that can be used to get accurate measurement results.