The invention belongs to the technical field of oil exploitation, and particularly provides a
colloid dispersion
polymer system and a preparation method thereof. The preparation method comprises the following steps that 1, preparing a composite tackifying aid, specifically, adding a dispersing agent into dechlorinated
tap water, and stirring to obtain a dispersing agent solution; and under a stirring condition, adding a
crystal forming agent into the dispersing agent solution, and continuously stirring to obtain the composite tackifying aid; 2)preparing a
polymer solution, namely adding
polymer dry powder into high-
calcium-
magnesium oil field injection water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain the
polymer solution; and 3)under a stirring condition, adding the composite tackifying aid into the
polymer solution, and stirring until flocculate in the
system is completely dispersed to obtain the
colloid dispersed polymer
system. By adding the composite tackifying aid, the interaction between
calcium and
magnesium ions and the polymer is changed, and the
viscosity reduction effect of the
calcium and
magnesium ions is inverted into the tackifying effect, so that the
viscosity of the polymer system is greatly improved, and the polymer system is uniform and stable.