Research and application of polymer reutilization technology

The residual polymer retained in high-permeability formation is fully utilized by rejecting polymer reusing agents to form the jam of flocculating and crosslinking,which can be used for in-depth permeability control.Residual resistance factors are used to select and evaluate the two kinds of reusing agents.It is found that the polymer flocculant has super sealing capability when the density of the residual polymer is low,as well as the fixed agents have selectivity in water plugging can effectively keep the high-density polymer solution stable in high-permeability formations.The lab flat physical simulating experiment shows that the reusing agents should be injected as early as possible to effectively enhance waterflooding recovery after polymer flooding.The polymer reutilization technology has been applied to Shuanghe Oilfield in Henan Province and Gudao reservoir of Shengli Oilfield,which shows that the waterflooding start-up pressure of water wells rises,the injection profile is improved,oil recovery is enhanced and water cut is decreased in corresponding oil wells.Therefore,the polymer reutilization technology is a useful IOR technique,and has broad application prospects.