連續(xù)油管論文：預彎曲連續(xù)油管及其疲勞壽命預測

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1、連續(xù)油管論文：預彎曲連續(xù)油管及其疲勞壽命預測【中文摘要】目前，全世界連續(xù)油管裝備與技術正大量投入到油氣田現(xiàn)場應用。連續(xù)油管設備以其占地面積小、作業(yè)成本低、搬遷安裝方便和保護油層等諸多優(yōu)勢而被譽為“萬能作業(yè)”設備。然而，由于連續(xù)油管在作業(yè)過程中要承受彎曲、拉伸以及內壓等應力的共同作用，極易發(fā)生疲勞斷裂，工作壽命短，作業(yè)成本高，從而使其推廣應用受到了很大限制。因此，研究提高和預測連續(xù)油管使用壽命的新技術對于石油工業(yè)具有重要的經濟價值和指導意義。本文介紹了連續(xù)油管的發(fā)展歷程、裝備與技術；提出了預彎曲連續(xù)油管技術，該技術通過將連續(xù)油管制造成彎曲形狀改善連續(xù)油管所受的彎曲應力，來提高連續(xù)油管的

2、疲勞壽命；建立了從滾筒到注入頭的預彎曲連續(xù)油管的力學分析與強度校核的新型數(shù)學模型；分析了現(xiàn)場作業(yè)過程中預彎曲連續(xù)油管應力循環(huán)特征；在對稱循環(huán)和脈動循環(huán)下的疲勞實驗數(shù)據(jù)的基礎上，應用擬合法和插值法建立了任意循環(huán)下從滾筒到注入頭的預彎曲連續(xù)油管的疲勞壽命預測模型；應用該模型簡單預測了預彎曲連續(xù)油管和直連續(xù)油管的疲勞壽命。通過對比兩種連續(xù)油管的預測壽命可得：在純彎曲條件下，預彎曲連續(xù)油管的疲勞壽命是直連續(xù)油管疲勞壽命的2倍以上；預彎曲連續(xù)油管技術可成倍提高連續(xù)油管的疲勞壽命?！居⑽恼緾urrently,alargenumberofcoiledtubingunitsandtechnolo

3、gyovertheworldareputintoinoil-gasfield索購全文在線加好友：278.121.888（同時提供論文輔導寫作和學術期刊論文發(fā)表服務）applications.Withitsmanyadvantages,suchassmallfootprint,lowoperatingcosts,easyrelocationandinstallation,protectionreservoir,wideapplication,etc.,coiledtubingunitiscomparedto“universaloperatingunit”.However,underco

4、mbinedactionsofbending,tension,internalpressureandotherstress,coiledtubinginoperationswillbefatiguefractureeasily,whichreducesworkinglife,increasesoperatingcosts,andmakestheapplicationtobegreatlyrestricted.Therefore,thestudyonthenewtechnologyimprovingandpredictingtheservicelifeofcoiledtubingiso

5、fgreateconomicvalueandguidingsignificanceforpetroleumindustry.Inthispaper,thedevelopmenthistory,unit,andtechnologyofcoiledtubingareintroduced.Pre-bendingcoiledtubingtechnologyisproposed,whichmayimprovethefatiguelifeofcoiledtubingbymakingcoiledtubinginthecurvedshapetoreducethebendingstress.Thene

6、wmathematicalmodelsofthemechanicalanalysisandstrengthcheckfromthereeltotheinjectionheadofpre-bendingcoiledtubingareestablished.Thestresscyclingcharacteristicsofpre-bendingcoiledtubinginfieldoperationsisanalyzed;onthebasisoffatigueexperimentaldataunderthesymmetriccycleandthepulsatingcycle,withfi

7、ttingandinterpolationmethod,the索購全文在線加好友：278.121.888（同時提供論文輔導寫作和學術期刊論文發(fā)表服務）fatiguelifepredictionmodelofpre-bendcoiledtubingunderarbitrarycycleisestablished.Thefatiguelifeofpre-bendingcoiledtubingwiththatofthestraightcoiledtubingis