粘彈性流體偏心環(huán)空非定常流的數(shù)值計(jì)算

1、大慶石油學(xué)院博士學(xué)位論文粘彈性流體偏心環(huán)空非定常流的數(shù)值計(jì)算姓名：楊樹(shù)人申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：油氣田開(kāi)發(fā)工程指導(dǎo)教師：崔海清20060510ABSTRACTNumericalcalculationofunsteadyflowofviscoelasticfluidintheeccentricannulusABSTRACTThetechniqueofpolyme卜noodngcanincreaseoilrecoverybymorethan

2、12％onthebasisofwaterflooding，andgainenormouseconomicbenefits，meanwhile，comeforthafewproblems，suchastheeccentricwearofthesuckerrodsaggravates，theperiodofexaminingpumpsandthelifespanofthesuckerrodsshortens，brokenrodincreas

3、esandSOonSo，theeccentricwearofthesuckerrodshasbeenaproblemthatneedstobesolvedquicklyTheexperimentprovesthattheelasticityofpolymersolutionmakesthesuckerrodsgetaradialforceperpendiculartoitsaxeswhenthesuckerrodsofpolymerfl

4、oodingwelldoesperiodicalinandfromotionintheeccentricannulus，andtheradialforcemakesthesuckerrodslosestabilityearlierwhenitWaspresseddownstroke，andaggravateeccentricwearofthesuckerrodsofpolymerfloodingwellAdoptingcommoncon

5、versionOldroydMaxwellconstitutiveequation，inthispapertheflowequationoftheunsteadyflowofviscoelasticfluidintheeccentricannuluswasestablished，andwasdiscretizedwithcontrolvolumemethod；velocityprofileoftheflowfieldWasobtaine

6、dbyusingADI(AlteringDirectionImplicit)iteratingmethod；theinfluenceofeccentricityofannulusandmotionparameterofthesuckerrodsonthevelocityprofileWasdiscusseddetailedly；thenormalforceactingonthesuckerrodsandtheradialforceact

7、ingontheinnerrodswerecalculated，geometryparameterofflowfield，fluidelasticityandthemotionofthesuckerrodsthathaveinfiuenceonthenormaIforcewereanalysedTheresultshowsthateccentricityandmotionvelocityoftheinnerrodshavethemost

8、importantinfluenceontheflowfield；eccentricityandfluidelasticityaretheultimatecausesofradialforce，Witheccentricityincreases，bothflowrateandtadialforoealsojncreasewhenmotionvelocityoftheinnerrodsincreasesthepeakvalueofflow

9、rateandradiaIforceincreasetoo；theexistenceofradialforceiStheultimatecauseofeccentricwearofthesuckerrodsaggravatinginthepolymerfloodingwell；preventingeccentricwearshouldstartwithreducingeccentricityAccordingtotheabovetheo

10、rymeasuresofcentralizingthesuckerrodsinwholeboretopreventeccentricwearhavebeenappliedtOmorethan6000ployme卜nood；ngwellsjntheDaqingOilField，andbringaboutincreasedeconomicbenefitsKEYWOlIDS：viscoelasticfluid，eccentricannulus