聚合物驱产出液中聚合物分子量和水解度的准确测定

聚合物分子量和水解度的测定仅限于纯净聚合物溶液,而对于含盐和其它杂质的油井产出液来说,传统的测定方法误差较大,影响了聚合物驱油井产出聚合物浓度的监测及地层聚合物存在形式的研究。采用超滤方法,应用美国微孔切向流超滤系统,消除了盐和其它杂质的影响,得到了较纯净的聚合物溶液,从而准确测定了产出液中聚合物的分子量和水解度。试验结果表明,应用美国微孔切向流超滤系统测得的聚合物分子量和水解度的相对误差均小于2.0%;而不经过美国微孔切向流超滤系统超滤的聚合物溶液,其分子量测定的相对误差在25.0%以上,其水解度误差甚至超过100%,达到104%。此外,采用超滤-沉淀的方法可以准确测定产出液中聚合物的浓度。实验表明,该法可以准确测定聚合物驱油井产出液中聚合物的分子量和水解度,满足现场检测的要求。

Accurate Measurement of Molecular Weight of Polymer and Degree of Hydrolysis in Product Fluids

The measurement of molecular weight and degree of hydrolysis of polymer produced in polymer flooding well is a problem not been solved, which may effect the study on concentration and existence form of the polymer. The traditional way can only be used for pure polymer solution, for the influence of salinity and other impurities leading to great error. In this paper using ultra filtration technique, pure solution is got to eliminate the influence and determine molecular weight and degree of hydrolysis accurately. The result of experiments shows that using the technique the relative error is no more than 2.0%, and without that procedure, the relative error of molecular weight is above 25.0%, and degree of hydrolysis is even more than 100% to 104%. Furthermore, concentration of the polymer produced in polymer flooding well could be determined accurately. In a word, this way can determine molecular weight and hydrolysis degree accurately and suit for the need of the field.