改进的浊度法用于检测大庆油田三元体系中的聚合物浓度

Detection of Polymer Concentration in Ternary System by Improved Turbidimetric Method in Daqing Oilfield

赵洪洲

ZHAO Hongzhou

采用浊度法检测大庆油田三元复合体系中的聚合物浓度时，碱和表面活性剂会影响聚合物浓度的检测结果。为了更准确地测定三元复合体系中的聚合物浓度，开展了浊度法的改进研究，通过盐析-萃取分析法消除三元体系中表面活性剂的影响，采用加大醋酸用量的方法消除碱的影响，考察了改进浊度法在测定现场油井采出 液中聚合物浓度的应用效果。结果表明，改进的浊度法消除了三元体系中表面活性剂和碱对聚合物浓度检测的干扰，提高了检测结果的准确度。用改进的浊度法测定室内三元体系中的聚合物浓度，可使相对误差由未改进前的2.00%～50.25%降至-4.40%～2.00%；现场用于测量喇嘛甸油田强碱三元复合试验区油井采出液中的聚合物浓度的相对误差为1.90%～5.20%。图1 表4 参12

When the concentration of polymer in ternary compound system of Daqing oilfield was detected by turbidimetric method，the test result could be influenced by alkali and surfactant. In order to measure more accurately the concentration of polymer in ternary compound system，the research on the improvement of turbidimetric method was carried out，the effect of surfactant was eliminated by salt-out extraction analysis method and the effect of alkali was removed by increasing the dosage of acetic acid. The application of improved turbidimetric method in the determination of polymer concentration in produced fluid of oil well was studied. The results showed that the improved turbidimetric method eliminated the interference of surfactant and alkali in ternary compound system，and improved the accuracy of test results. When improved turbidimetric method was used to detect the polymer concentration of ternary system in laboratory，the relative error decreased from 2.00%—50.25% to -4.40%—2.00%，while used to detect the polymer concentration in produced fluid of oil well in alkali ternary compound pilot area of Lamadian oilfield，the relative error was 1.90%—5.20%.

10.19346/j.cnki.1000-4092.2016.06.035