适于海上油田的聚合物产出浓度快速测定方法

Rapid Determination of Polymer Concentration for the Polymer-Flooding Produced Fluid in Offshore Oilfield

针对传统淀粉-碘化镉聚合物浓度检测方法测试步骤繁琐、时效性差和成本高等问题,建立了"微滤膜-定氮"检测方法:选用孔径尺寸为0.45μm的微滤膜对采出液预处理,采用碱性过硫酸钾消解紫外分光光度法建立双波长校正吸光度A与聚合物浓度C之间的定量关系,据此实现对聚合物浓度的快速准确检测。考察了所建立的快速测定方法的准确性和重现性。根据该分析方法研制了便携式聚合物浓度检测仪。研究结果表明:用该法测量模拟聚合物驱采出液中的HPAM浓度相对误差小于1%;测量油田现场采出液中的HPAM浓度相对标准偏差小于2%,数据重现性好于淀粉-碘化镉法。便携式聚合物浓度检测仪体积小、重量轻(约4 kg),测试步骤简便快捷,可满足平台现场取样、就地化验的需求。

In order to overcome the disadvantages, such as complicated testing steps, poor timeliness, high cost and so on, of the conventional starch-cadmium iodide polymer concentration detection method, a ＂microfiltration-nitrogen detection＂ method was established. Firstly, microfiltration membrane with a pore size of 0.45 μm was introduced to pre-treat produced liquid for removing interfering factors. Then, the relationship of double wavelength corrected absorbance A and polymer concentration C was detected via the potassium persulfate UV spectrophotometry method for determining the polymer concentration finally. The accuracy and repeatability were studied and a portable polymer concentration detector was produced accordingly. The experiment results showed that when the method was used for the simulative HPAM solution, the relative error was less than 1.0%. When used for the produced fluids in oilfield, the relative standard deviation was less than 2% , and the data reproducibility was better than that of starch-cadmium iodide method. The portable polymer concentration detector, which possessed the advantages of small size, light weight （about 4 kg）, simple and rapid test procedure, could meet the in situ sampling and testing needs on the platform.