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1、西安石油大學(xué)碩士學(xué)位論文油田環(huán)境下真空滲氮油套管防腐性能研究及應(yīng)用評(píng)價(jià)姓名：李瓊瑋申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：油氣田開(kāi)發(fā)指導(dǎo)教師：蒲春生楊全安20040515Subject：ThePropertiesStudyandAppliedEvaluationofVacuumGasNitriding(VGN)OilTubingandCasingUnder0ilfieldEnvironmentSpeciality：DevelopmentEngineer

2、ingofOil&GasName：LiQiongwei(signature)上嘲砌Instructor：PuChtmsheng(sig腿ture)——YangQu一(signature’‘凈凈舭舯～AbstractAsthecharacteristicofthereservoirlowpenetration，lowpressure，lowyieldinChangQingoilfietd，thecorrosiondamageofoilan

3、dinjecfionwaterwellcasingbecomemoreandmoreseriousinproductionsystem，beganfrom1970’SChangQingoilwellcorrosionmainlyincludetheoutercorrosionofupperareaandtheinnercorrosionoflowersectionTheCOrrOSiveinfluencesarecomplex，SOit

4、needsanticorrosivetechnologywithpropertiesoflowinvestmentandhigheffectItiSanewresearchdirectionthatfindinganewefficienttechnologybyusingsurfacetreatingtechnologyinmetalmaterialscience，whichadapttodifferentconditionwellAs

5、asurfacechemicaltreatmentmethodnitrogendiffusesinthesurfaceofcasingandformsalluniformprotectivedepositionlayenThecorrosionbehaviorsofVacuumGasNitriding(vGN)oiltubingandcasingweresystematicallyexaminedbothbylaboratoryandf

6、ieldtestsunderChangQingoilfieldcorrosiveenvironmentsThisthesisstudycorrosionprooftheoryandtechnicalfeaturesofVacuumGasNitriding(VGN)casingOnthebasisofmicromechanismanalysis，mechanicalphysicalchange，electmchemicalprotecti

7、onbehaviors，andautoclavetest，itprovedthattheanticorrosionabil時(shí)ofVGNonwelltubingisexcellentand47timeshigherthannormaloneAtthesanletime。fieldtestshavebeenevaluatedaccordingtoproductionprocessandappliedconditionsn塢relations

8、hipsbetweenmicromechanismchangesofnitridinglayeranditsapplicationbehaiiorsarealsoanalyzed，whichunderdifferentbendanddrawstrengthconditionnlenthedownholequalificationofVANoilwellcasingisdeterminedTheproperconditionofVGNca

9、singiswelldepthnotlongerthan1700meterthedoglegseveritymustbesmallerthan5。／30mmbehaviorsofthismatchalunderstressstatearealsesearchedIn2003，VGNoilwellcasingwasappliedintowholewellcasing，ZHONG2521andZHONG252—2ofChangQingoil

10、field，firstlyinChinaoilcompanyTheachievementofthisresearchCannotonlyenlargetheappliedrangeandcorrosionprooftheoryofVGNbutalsosupplysuggestioninlargescaleengineeringSoitisoneofthegooddevelopmentdirectionsforprotectioncasi

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