Studys On Enhancing Oil Recovery By High Concentration Polymer Flooding In Daqing Oilfield

After the exploitation by water-flooding There are a lot of remaining oil in the reservoir ofthe east of the second north block.the oil can’t flow because restraining with CP or the asversemobility contrast between displacing phase and undisplacing phase.That make swept volume ofinjection solution Junior. Polyme roil displacemen can enhance the consistence of injectionwater and improve the mobility contrast of water-oil, enhance the sweep efficiency anddisplacement efficiency of microcosmic. petroleum reservoir of PI in the east of the secondblock of north went into period of normal injection polymer in2002,， encrypted and put inoproduction in2006. Polymer flooding already had application and dissemination in thepetroleum reservoir of PI in the east of the second north block. According to the factor ofcharacter and heterogeneity of petroleum reservoir and effectiveness of polymer injection,conduct adjustment of personalitical producer injector variable.Effectiveness were obvious inthe different area,but expose many problems.Such as response disproportion and the speed ofwater content rising by oil well and so on. How to obtain one new technology for EOR withwide applications is a big challenge to the researchers and technical personnel.This articleanalyse deposit character, the condition of petroleum reservoir, anisotropic character andremaining oil of PI in the east of the second north area. by means of the laboratoryexperiment made the optimise project about the concentration, molecular weight, slugassemblage and a converted opportune moment of high concentration polymer liquor.thelaboratory experiment demonstrate: raising the polymer concentration can improving theviscoelastic behavior,then enhanced oil recovery.For controling the rapid of containing waterascension better and excavating the remaining oil of petroleum reservoir in the late polymerinjection,we proceeded the experiment in the east of the second north area.,explore theeconomical and technical boundary line about that continue enhanced oil recovery of PI byhigh concentration polymer flooding,then excavate the remaining oil.