油田用烯烃磺酸盐液相色谱-质谱检测法

Detection Method of Olefin Sulfonate Used in Oilfield by Liquid Chromatography-Mass Spectrometry

针对传统滴定检测法的灵敏度低、抗干扰能力差、检测周期长等不足,利用液相色谱串联四级杆质谱联用仪建立了油田用烯烃磺酸盐的检测方法。优化了检测条件,定量检测了烯烃磺酸盐产品、注入液和产出液中的烯烃磺酸盐。结果表明,检测烯烃磺酸盐的最佳条件为:阴离子型色谱柱;流动相为体积比55∶45的甲醇和8 mmol/L乙酸铵水溶液,等度洗脱;质谱检测器,条件为电喷雾离子源,负模式,雾化气压力30 psi、干燥气流速8 L/min、干燥气温度350℃、全扫描。该方法对烯烃磺酸盐产品、注入液和产出液的加标回收率分别为82.63%~96.37%、78.60%~95.41%、82.68%~95.72%,8 min即完成一次样品检测,且聚合物、微量原油等对检测结果影响较小。该方法可快速、灵敏的检测烯烃磺酸盐产品、注入液及采出液中目标物质的含量,抗干扰能力强。

Aiming at the disadvantages of traditional titration detection method such as low sensitivity,poor anti-interference ability and long detection period,a detection method forα-olefin sulfonates used in oilfield was established by liquid chromatography tandem quadrupole mass spectrometer.By optimizing the detection condition,the quantitative detection of olefin sulfonate in olefin sulfonate product,injection fluid and output fluid was realized.The results showed that the optimum detection condition was obtained as follows:anionic chromatographic column,mobile phase contained methanol and 8 mmol/L ammonium acetate aqueous solution in volume ratio 55∶45,isocratic elution.The mass spectrometry detection condition was obtained as follows:electrospray ion source,negative mode,30 psi atomizing pressure,8 L/min dry air velocity,350℃dry gas temperature,full scan.The recovery rate of this method for olefin sulfonate product,injection fluid and produced fluid was 82.63%—96.37%,78.60%—95.41%and 82.68%—95.72%,respectively.One sample detection was completed in 8 minutes.Meanwhile,polymer and trace oil had little effect on the detection result.This method was fast,sensitive and had strong anti-interference ability.