三維井眼油井桿管偏磨機(jī)理研究.pdf

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3、udyonthemechanismofthewearbetweencasingandsuckerrodinthreedimensionalholewellSpeciality：MaterialengineeringName：NieJie(signature)凸絲。f絲Instructor：LiXiao(signature)叢幺!絲ABSTRACTFirstlythisthesisbrieflyanalyzestheforcecondit

4、ionofthecasingandsuckerrodsystem，andsetsthethreedimensionalsimulationmodelwhichmodelsthefiniteelementoftheoffcenterwearofcasingandsuckerrodinthewellAndpreliminarilyestimatewheretheoffcenterwearmayhappenbyincreasingtheloa

5、ddifferentlyonthesimulationmoelThenitcomestofindouttheforceconditionindifferentwellsandwheretheoffcenterwearmayhappenbysettingdifferentfiniteelementholemodelandanaloguesimulatingMeanwhileitmakesanlateralcomparisonItmakes

6、afurtherstudyontheinfluencelawbetweenthedifferentholetrackandtheoffcenterwearinwellsItpreliminarilycomestotheconclusionthatthemoreholetrackbending，themoreeasilytheoffcenterwearhappensFinallywecanpreventtheoffcenterwearaf

7、terthestudyonitsmechanismThecontactforcebetweenthesuckerrodandvittadeterminesthedegreeofeccentricwearThisthesishasbuiltaindexnamedcurvaturetepresenttheboreholetrajectoryAndafterthetheoreticalanalysis，arelationshipmodelbe

8、tweenthecurvatureofwellL，wellCandthecontactforcehasbeenmadeWecanfixthecantactforcebetweenthevittaandsuckerrodanditspositionbytheboreholetrajectoryusingthismodelSettingtheanalyticalmodeloftheeccentricwearbetweenthesuckerr

9、odandvittainthew色US，WellLandWellC，WegetthelawbetweentheboreholetrajectoryandlocationanddegreeoftheeccentricwearinthesametypeofwellsindifferentobliqueandthedifferenttypeofwellsinthesameobliqueWhenthedeVl‘a(chǎn)tionincreases，th

10、ecurvatureofthesuckerrodalsoinereasesandthecontactforcebetweenthesuckerrodandvittaalsoinereasesInthiscase，theeccentricweerbetweenthevittaandsuckerrodiSmorepronetohappenAfterweinstallthecentralizeronthesuckerrod，wemadeaco

11、mputationofthefiniteelementsimulationagainThenwecangetthefunctionandsignificanceofthecentralizeronpreventingtheeccentricwearbetweensuckerrodandvittaCentralizerscansignificantlyreducethecontactforcebetweenthevittaandsucke

12、rrod，whichcaneffectivelypreventtheeccentricwearLastlyweusethetheorymethodandthefiniteelementmodellingmethodinthepraticalwellconditionsAftercomparingthetwesultsthatwegotinthetwomethods，wefoundthattheformerresultisclosetot