基于紫外遮蔽的HPAM干扰下聚合物微球的定量检测

Quantitative Detection of Polymer Microsphere under Interference of HPAM Based on UV Masking

聚合物微球调驱技术已经在华北油田各采油厂广泛应用,取得较好效果。由于油田产出液中存在线性聚丙烯酰胺(HPAM)的干扰,聚合物微球含量难以准确测定。针对这一问题,利用紫外分光光度法,采用特定波长下不同浓度样品线性拟合曲线斜率最大化方法,优选最佳检测波长;采用部分遮蔽紫外响应的方法,向参比及待测溶液中添加含铵离子的遮蔽剂以消除HPAM的影响。结果表明,紫外分光光度法检测聚合物微球的最佳波长为196 nm。在遮蔽剂加量为2 g/L、聚合物微球质量浓度为1~200 mg/L时,明确了吸光度与微球浓度的线性关系,相关判定系数为0.9987,实现了HPAM干扰下聚合物微球含量的定量检测。

Polymer microsphere flooding technology has been widely used in oil production plants in North China oilfield,which achieved good results.Due to the interference of linear polyacrylamide(HPAM)in oilfield produced fluid,it is difficult to accurately determine the content of polymer microsphere.In this paper,the UV spectrophotometer method was used to optimize the best detection wavelength by maximizing the slope of linear fitting curve of samples with different concentrations at a specific wavelength.The influence of HPAM was eliminated by adding masking agent with ammonium group to the reference and the sample by partially masking the UV response.The experiment results showed that the optimum UV detection wavelength of polymer microsphere was 196 nm.When the dosage of masking agent was 2 g/L and the microsphere concentration was 1—200 mg/L,the linear relationship between absorbance and microsphere concentration was determined.The correlation coefficient of determination was 0.9987.The quantitative detection of polymer microsphere under HPAM interference was realized.