Optimization Of Profile Control Agent And Injection Parameters In Longhupao

No.9 oilfield in Daqing has poor physical properties and serious heterogeneity,and the differences between the blocks are large.In recent years,with the development of the production,the water content of produced water increases year by year,the water injection inefficient circulation is serious,and the oil displacement effect becomes worse.In order to improve the water flooding efficiency,the profile control measures have been carried out in several blocks,and some results have been achieved.However,the profile control effect of each block is uneven,even if the profile control effect of different wells in the same block is very different.In order to improve the effect of profile control,residual oil mining effectively,this paper mainly studies the multi-rotation profile control in the room,and selects the type of profile control agent and the best profile control formula for the heterogeneity of the dragon and the bubble Which can be used to optimize the injection parameters of the profile control agent,so as to provide an effective way to further reduce the inefficient circulation and the tapping potential of the injected water.After several experiments,the comparison of chromium,phenolic,and conventional three cross-linking agents showed that the cross-linking agent in the chromium system meets the construction requirements.For the new wells that are to be profiled in a single round,the optimal profile control agent formulation is: 0.6% polymer(Clow)+ 0.5% cross-linker(C1)+ 0.4% cross-linker(C2),optimum injection rate is 1 ml/min,optimal injection volume is 0.1-0.2 pv.For older wells that require multiple profile profiles,the preferred multiple profile formulation is: 0.6% polymer(C low)+ 0.6% crosslinker(C1)+ 0.5% crosslinker(C2),It meets the actual requirements of the multi-round profiler formulation in Longhupao Oilfield,and the injection parameter optimization experiment is performed on the three-pipe parallel core.The optimal injection time for the first round of profile adjustment is 70% moisture content,and the injection 0.08 pv,injection rate 0.3ml/min;optimal injection timing for the second round of profile adjustment is 70% moisture content,injection volume 0.1pv,injection rate 1.5ml/min;optimal injection timing for the third round of profile adjustment 80% The injection volume was 0.12 pv and the injection rate was 2.5 ml/min.At this time,the ultimate recovery in the laboratory experiment was the highest,which was 76.24%,which was 3%-5% higher than other injection parameter schemes.Therefore,it was the optimal solution.