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郭旗西区油田长6储层特征研究及注水开发方案.docx

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郭旗西区油田长6储层特征研究及注水开发方案 Abstract TheGuoqiwestoilfieldhasbeenplayingasignificantroleintheChineseoilindustryforthepastfewdecades,whichmakesitacrucialareaforfurtherresearch.Basedontheacquisitionandanalysisofdrilling,logging,andproductiondataoftheGuoqiwestoilfield,thispapersummarizesthereservoircharacteristicsofthe6thlayerandproposesawaterinjectiondevelopmentprogramforthislayer.Throughthisdevelopmentprogram,itisexpectedtoimprovetheoverallrecoveryefficiencyoftheGuoqiwestoilfield,contributetothesustainabledevelopmentoftheoilandgasindustry,andpromotethenationalenergysecurity. Keywords:Guoqiwestoilfield,6thlayer,reservoircharacteristics,waterinjection,developmentprogram Introduction TheGuoqiwestoilfieldislocatedinthewesternpartoftheDagangOilfieldinChina,coveringanareaofapproximately56km2.The6thlayerisoneofthemainoil-bearingreservoirsinthisoilfield,whichhasbeenwidelydevelopedbymanyoilandgascompanies.However,duetothecomplexgeologicalconditions,poorreservoirproperties,andinefficientdevelopmenttechniques,therecoveryefficiencyofthislayerisstilllow,andtherearestillsignificantchallengesinoptimizingitsdevelopmentprogram.Therefore,thisstudyaimstoinvestigatethereservoircharacteristicsofthe6thlayerandproposeawaterinjectiondevelopmentprogramtoimprovetherecoveryefficiencyoftheGuoqiwestoilfield. ReservoirCharacteristicsofthe6thLayer Thereservoirrocksofthe6thlayerintheGuoqiwestoilfieldaremainlysandstones,withthethicknessrangingfrom12to26meters.Theporosityofthesesandstonesisgenerallylow,rangingfrom8%to12%,andthepermeabilityisalsolow,rangingfrom0.5to5mD.Theintergranularporesarethedominantporetype,andthesecondaryporessuchasdissolutionandfracturesarerelativelyfew.Thereservoirpressureofthe6thlayerisrelativelylow,rangingfrom9to12MPa,whichmakesitdifficulttoachieveeconomicaloilproduction.Thereservoirfluidbelongstothemediumorheavycrudeoil,withaviscosityrangingfrom50to5000mPa·s,anAPIgravityrangingfrom10to30,andagas-oilratiorangingfrom50to500m3/m3. Basedontheanalysisoftheabovereservoircharacteristics,