一种降黏剂在体相中的分配规律

Distribution Regulation of a Novel Viscosity Reducer in Different Phases

石 静 王红艳 郭淑凤 郭 勇 王 帅

SHI Jing WANG Hongyan GUO Shufeng GUO Yong WANG Shuai

降黏剂浓度的分析检测方法及检测结果对其种类设计和实施方法有着重要的指导意义。为了实现胜利油田使用的一种新型降黏剂的浓度检测， 建立了可准确分析水相、 油相中降黏剂浓度的疏水高效液相色谱法， 并对降黏剂在不同体相中的分配结果及变化趋势进行了跟踪考察。研究结果表明： 对于水相， 检测方法的最小检测量可达 10 mg/L， 在 10～ 3000 mg/L范围内具有良好线性关系， 相对标准偏差<5%； 对于油相， 可结合梯度溶剂萃取的前处理技术， 将降黏剂从油相中萃取分离， 再进行分析检测， 提取效率高于 95%。对于原油/降黏剂两相 （水相和油相） 体系 ［煤油、 原油质量比 1∶2， 油样、 降黏剂溶液 （质量分数 3%） 质量比 1∶1］， 80%以上的降黏剂分布在水相， 且随着温度的升高， 油相中的含量有增高趋势。对于原油/降黏剂三相（水相、 乳液相和油相）体系［煤油、原油质量比 1∶1， 油样、 降黏剂溶液 （质量分数 3%） 质量比 1∶1］， 油相中几乎不含有降黏剂， 约 75%的降黏剂分布在乳液相中； 随着温度的升高， 乳液相中的含量有所降低而水相中的含量有所增大； 盐水条件下水相中的含量稍高于纯水条件下的， 不同盐水体系的降黏剂的含量分布结果类似。图 2表4参 11

The concentration detection method and results of a viscosity reducer play important roles on its structure design and usage method. To realize the concentration analysis of a novel viscosity reducer used in shengli oilfield， a high-performance liquid chromatography method with a hydrophobic column was established for water and oil phase samples，and the distribution regulations of concentration in different phases were investigated. The results showed the lowest limit of detection for water phase sample was 10 mg/L， the broad linear range was 10—3000 mg/L and relative standard deviation was less than 5%. Combined with gradient solvent extraction technique， the viscosity reducer existing in the oil phase could be efficiently extracted and separated from oil samples， and then could be analyzed adopting above established analytical method. The extraction efficiency was over 95%. As for crude oil/viscosity reducer binary system（the mass ratio of kerosene and crude oil was 1∶2， and the mass ratio of oil sample and 3% mass fraction of viscosity reducer solution was 1∶1）， over 80% viscosity reducer distributed in water phase， and the content in oil phase slighted increased with the increase of temperature. As for crude oil/viscosity reducer ternary system（the mass ratio of kerosene and crude oil was 1∶1， and the mass ratio of oil sample and 3% mass fraction of viscosity reducer solution was 1∶1）， there was nearly no viscosity reducer in oil phase， about 75% of viscosity reducer distributed in emulsion phase and the minority was in water phase. With the increase of temperature， the content in water phase increased. Under the condition of salt solution， the content in water phase was little more than that with pure water solution， however， the content was almost similar to each other under the conditions of various concentration salt solution.