定向井鉆柱摩阻與強度分析計算

1、中國石油大學（華東）碩士學位論文定向井鉆柱摩阻與強度分析計算姓名：張慧萍申請學位級別：碩士專業(yè)：石油與天然氣工程指導(dǎo)教師：管志川趙金海20081001AnalysisandComputationofDragandStrengthofDrillStemforDirectionalWellZhangHuiping(OilandGasWellEngineering)DirectedbyProfGuanZhichuanAbstractBased

2、onthetheoryofsmalldisplacementdeformationofslenderrodandtheengineeringcharacteristicsofdirectionalwells，thefundamentaldifferentialequationofstaticanalysisofdrillstringisderivedbyconsideringtheeffectsoftorqueandaxialforce

3、onbendingproblemsandthechangesofactingpositionanddirectionofappliedforceandmomentcausedbydeformationBecauseoftheuseoftheCOmovingcoordinate，thederivationprocessseemssimpleandclearWhendealingwiththecontactproblembetweenbor

4、eholewallanddrillstring，theboreholewallistreatedasallelasticbodyinordertofitfortheactualdrillingsituationOwingtotheDoubleNonlinearoflargedisplacementandcontactproblem，aswellasthenonlinearofthesolvedfundamentalequation，it

5、isnecessarytousethecomplexfunctiontoconvertthefundamentalequationintovariablecoefficientnonlinearordinarydifferentialequationAfterconvertingtheiterativeapproximationequationintoconstantcoefficientlinearordinarydifferenti

6、alequation，theapproximationvaluecallbecalculatedbytheiterativemethodonthecomplexplaneAccordingtotheactualcalculation，thismethodhasafastconvergencerateOnthebasisofthismethod，thecomputationsoftwarewhichisusedtogetthedrills

7、tringdragandstrengthindirectionalwellsisdevelopedbyusingdatabasetechnologyThepaperanalysesthedifferentforceconditionofthedrillstringundervariousboreholeassemblyoperatingparametersandwellconditionsthroughaseriesofactualex

8、amplecalculationThepracticalexamplecalculationshowsthatthecalculationmodelofthedrillstringstrengthanddragandtorqueisreasonable，thetheoreticalcalculationresultsalsohaveagoodcoincidencewiththepracticalmeasurementresultsThe

9、computationsoftwarecanbeusedforcalculatingthedrag，torqueandhoodloadConsequentlyitcanprovideanalysismeansforthedesignandconstructionofdirectionalwells，thepreventionandtreatmentofaccidentsandtheselectionofdrillrigsanddrill