The invention discloses a profile control and plug removal integrated operation
system and method for a
polymer flooding and
injection well, and belongs to the technical field of profile control and plug removal of a
polymer injection well in the
petroleum drilling and production technology. The method comprises the following steps: manufacturing an artificial high-permeability core and a low-permeability core, evacuating saturated water and saturated oil from the high-permeability core and the low-permeability core, connecting the high-permeability core and the low-permeability core in parallel to form a model for simulating intra-layer and inter-layer heterogeneity of an oil reservoir, performing constant-speed
water flooding, injecting a
polymer solution into the parallel model at a
constant speed, and performing subsequent
water flooding until the
water content is 90%; the
calcium chloride, the spacer fluid and the
sodium silicate solution are alternately injected into the parallel model for multiple rounds under
constant pressure P profile control, and contact and react in the high-permeability layer to finally generate the
silicate gel profile control agent; according to constant-pressure P plug removal, plug removal working liquid is injected into the parallel models, and the models are closed for 12-36 h; and injecting water into the parallel model under the constant-pressure P follow-up water drive, and performing follow-up water drive until the
water content reaches 90%.