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In view of the problems of polymer flooding in wells with high concentration and severe coalescence, a polymer flooding profile control and anti-sludging efficiency enhancement technique was proposed. By adjusting the formulation of the gel system, profile control systems with different gel strengths were constructed. The pre-shearing experiment of the gelation liquid showed that the shearing effect severely affected the long-term stability and gel strength of the gel for the same formulation system with the same initial gel strength, and the addition of nanoparticles could effectively reduce the shear effect on the long-term stability of the gel. Impact. On this basis, the strength of the gel profile modification system was optimized through physical simulation. The results show that for GD polymer flooding reservoirs, only H-strength gel systems can effectively seal the high-permeability layers. Therefore, the optimized formulation for the formation of the solitary polydisperse reservoirs is 0.5% polymer N632+ 0.4% organic chromium crosslinker + 0.3% nanoparticle stabilizer.

Study on Polymer Flooding Profile Control and Antimony Technology