EXPERIMENTAL RESEARCH ON BREAKING POLYMER GEL

On the basis of investigation of breaking polymer gel with oxidizers such as H2O2,K2S2O8,BH,CH,this paper uses the orthogonal test method to probe the optimized composition of gel breaking agent.Test results show that the composition of the optimized agent at 60℃ is as follows:0.35% H2O2,0.4% K2S2O8,0.5% BH and 0.6% CH.The compounded oxidizer can effectively break the polyarylamide gel crosslinked by hexamethylene teramine with the viscosity of 2.3×105 mPa·s.When the pH is 2,the percentage of gel breaking can be up to 99%,and the viscosity of the post-breaking residual fluid is low.Core test results show that the water shutoff percentage is above 98% before breaking gel,and the recovered value of permeability after breaking gel can be more than 98%.