锦州9-3 油田二元复合驱产出表面活性剂的检测方法研究

Detection Method Study on Produced Surfactant of Binary System Flooding in Jinzhou9-3 Oilfield

吴晓燕 朱洪庆 张 宁 陈士佳 王成胜 乔 方 翁大丽 张润芳

WU Xiao-Yan ZHU Hong-Qing ZHANG Ning CHEN Shi-Jia WANG Cheng-Sheng QIAO Fang WENG Da-Li ZHANG Run-Fang

锦州9-3 油田二元复合驱产出表面活性剂缺乏快速、准确的定量检测方法。显色剂硫酸氰钴铵与非/阴离子型表面活性剂HDS生成蓝色络合物，其颜色深浅与HDS的浓度成线性关系，因而可通过分光光度法确定HDS的浓度。通过室内实验对检测方法进行优化，得到最佳测试条件：测定波长322 nm，1 L 显色剂溶液中含620 g 硫氰酸铵与280 g 六水合硝酸钴，萃取剂苯的加量15mL ，显色剂反应时间25min，萃取静置时间60min，离心条件为2000r/min 下离心20min。标准曲线拟合方程为y=0.0011 x ，相关系数0.9973，对实际样品测试的相对偏差绝对值小于5 ﹪。该方法具有简单、快速、准确的特点，有望应用于海上油田表面活性剂浓度的快速测定。

Jinzhou9-3 oilfield lacked a simple and accurate quantitative detection method for the produced surfactant in binary system flooding. The chromogenic agent of NH4Co(SCN)3 could react with anion/non-ion surfactant HDS to form a blue compound，whose color depth was linear with the concentration of HDS. Therefore，the concentration of HDS in produced water could be determined by spectrophotometry method. The detection method was optimized by laboratory experiments and the optimum testing condition was obtained as follows: testing wavelength of 322 nm，the chromogenic agent solution containing 620g NH4SCN and 280 g Co （NO3）2· 6H2O，benzene dosage of 15mL in extractant，reaction time of 25min，holding time of 60min，running speed centrifuge of 2000r/min and centrifugal separation time of 20min. The results showed that the fitted equation of standard curve could be described as y=0.0011 x，and the correlation coefficient（R2 ）of standard curve was 0.9973，indicating good dependency ，and the relative deviation of absolute value was less than 5%. The optimum test method had an expectation to use for the quick determination of surfactant in compound flooding of offshore oilfield.