采出液中聚合物浓度准确测定方法及应用

发布时间：2018-02-26 22:16

本文关键词： 聚合物浓度定氮采出液微滤膜过滤　出处：《油田化学》2017年02期 　论文类型：期刊论文

【摘要】：定氮法检测海上油田注入井聚合物浓度具有快速、准确及安全的特点,但在应用到采出液聚合物浓度检测过程中发现,采出液中乳化原油、泥砂等杂质难以分离,会导致吸光度偏大而干扰测定结果。为提高采出液中聚合物浓度测定的准确性,本文分析了采出液中乳化原油粒径分布、残余聚合物水动力学直径及相对分子量质量分布,结合微孔滤膜的筛分原理提出并规范了采出液聚合物浓度"微滤膜过滤-定氮"检测方法。研究表明,采出液乳化油珠粒径主要分布在5数20μm之间,粒径中值9数17μm,80%以上乳化油珠粒径大于5μm,而残余聚合物水动力学直径在0.4数1.2μm之间,二者范围可明显区分。选用孔径尺寸为1.2数5μm微滤膜对采出液进行预处理,可使定氮法测定采出液中聚合物浓度时的误差由16%缩小到5%以内。该检测方法经过在海上注聚油田的反复试验,取得了良好的应用效果。
[Abstract]:The determination of polymer concentration in injection wells in offshore oil fields by nitrogen determination method has the characteristics of fast, accurate and safe. However, it is found that it is difficult to separate impurities such as emulsified crude oil and mud sand in the process of detecting polymer concentration in produced fluids. In order to improve the accuracy of polymer concentration determination, the particle size distribution of emulsified crude oil, the hydrodynamic diameter of residual polymer and the distribution of relative molecular weight mass are analyzed in this paper. Combined with the screening principle of microporous filter membrane, a method for the determination of polymer concentration in recovery liquid "microfiltration membrane filtration-nitrogen determination" was proposed and standardized. The results showed that the diameter of emulsified oil beads was mainly distributed in the range of 5 ~ 20 渭 m. The average particle size of emulsified oil beads was more than 5 渭 m and the hydrodynamic diameter of residual polymer was between 0.4 and 1.2 渭 m. The range of microfiltration membrane with pore size of 1.25 渭 m was used to pretreat the produced liquid. The error of determination of polymer concentration in produced liquid can be reduced from 16% to 5% by nitrogen-determination method. After repeated tests in offshore polymer injection oil field, good application effect has been obtained.
【作者单位】：海洋石油高效开发国家重点实验室;中海油研究总院;
【基金】：“十三五”国家科技重大专项项目25课题3“海上油田化学驱油技术”(项目编号2016ZX05025-003)
【分类号】：TE53

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