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.