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聚表剂驱注聚泵后粘度偏低原因分析及治理.docx

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聚表剂驱注聚泵后粘度偏低原因分析及治理 Title:AnalysisandTreatmentofLowViscosityafterInjectingPolymerFloodingwithAggregates Abstract: Polymerfloodingwithaggregatesisapopulartechniqueusedinoilfieldstimulationtoenhanceoilrecovery.However,onecommonproblemencounteredduringthisprocessistheoccurrenceoflowviscosityafterinjectingthepolymerflooding.Inthispaper,weaimtoanalyzethereasonsbehindthisissueandproposeeffectivetreatmentstoaddressit. Keywords:polymerflooding,aggregates,lowviscosity,viscosityreduction,treatment 1.Introduction Polymerfloodingwithaggregatesisamethodwidelyusedintheoilindustrytoimproveoilrecovery.Itinvolvesinjectingapolymersolutionintoreservoirstoincreasetheviscosityofthedisplacingfluid,thusimprovingthesweepefficiencyandreducingbypassingeffects.However,sometimesaftertheinjection,theviscosityofthefluiddecreasessignificantly,leadingtodecreasedoilrecoveryefficiency.Thispaperaimstoanalyzethecausesofthisissueandproposesolutionstoremedyit. 2.ReasonsforLowViscosityafterInjectingPolymerFloodingwithAggregates 2.1PoorAggregatePre-treatment Aggregatesusedinpolymerfloodingaretypicallycomposedofsolidparticles,suchassandortraditionalproppants.Pooraggregatepre-treatmentcanleadtotheformationoflooseaggregatesoragglomerates,whichcaneasilydisintegrateunderhighshearconditionsduringinjection.Thisdisintegrationreducestheviscosityofthepolymersolution,resultinginloweroilrecoveryefficiency. 2.2OvershearingduringPolymerInjection Duringpolymerflooding,thehigh-pressureinjectionprocesscansubjectthepolymersolutiontohighshearforces,whichmayleadtoovershearingandsubsequentreductioninviscosity.Overshearingoccurswhentheshearstressexceedstheelasticlimitofthepolymerchains,causingthemolecularstructuretobreakdown.Thisbreakdownresultsinadecreaseinpolymerchainlengthandasubsequentreductioninviscosity. 2.3PolymerDegradation Polymerdegradationcanoccurduetofactorssuchashightemperature,highshear,orthepresenceofimpurities.Degradedpolymershaveareducedmolecularweight,leadingtolowerviscosity.Factorssuchaspoorwaterqualityandin