井下套管损坏机理及围压分析-设计论文

西安石油大学本科毕业设计（论文）井下套管损坏机理及围压和应力分析摘要:首先本文作者通过对油田套管大量损坏这一问题的调查，发现了套管损坏是当今石油开采过程中存在的普遍问题，给石油生产带来了巨大的损失。提出对井下套管损坏机理和围压应力分析的必要性。之后通过阅读相关文献，综合分析了各种引起套管损坏的原因。推导套管挤毁压力公式，计算井下套管围压。得出相应的结论。其中套管损坏的主要原因有：是套管柱设计不合理，尤其当套管处于盐岩、泥(页)岩地层，设计载荷偏小;不合理的注水，加速套管的损坏;套管柱本身设计强度较低，射孔在一定程度上对套管的强度产生影响，加速了套管损坏;腐蚀使套管避变薄，甚至穿孔，降低套管强度，损坏套管;油层出砂、固升质量差、套管缺陷等造成的套管损坏。造成套管损坏的因素很多，其中套管围压的增大是套管损坏的主要因素之一，因此我们很有必要对套管的围压进行分析。最终本文在分析与研究了造成套管损坏因素的基础上，提出相应的套管损坏防治措施对套管损坏形式进行了分析研究；分析了在考虑与不考虑固井水泥石的情况下套管围压的计算方法；设计了完井井下管柱载荷试验台。关键词：套管损坏；套管围压；应力分析西安石油大学本科毕业设计（论文）Casingpipedamagemechanismandanalysisofconfiningpressureexertonundergroundcasingfirstly,thewriterbasedonthefactthatlargenumberofcasingpipearedamagedduringworkingtime.Obviously,itisacommonproblemwhichcauseslargeamountoffinancelostduringtheproductionprocedure.Itisnecessaryandurgenttoanalysisthemechanismofcasingdamageandconfiningpressure.Thenthewriterreadsomedocumentsonthissubject.Analysisedthefactorsthatcouldcausecasingdamage.Evaluatedconfiningpressureandgotthesolutiontotheproblem.Herearesomefactorsthatmightberesponsetocasingdamage.1.unreasonabledesignofcasingstring(especiallyinsaltbetandmudslide(shale)formation);2.unreasonablewaterinjection;3.casingperforation;4.corrosion;5.sandproblems,cementingqualityandcasingdefect.Accordingtoalotoftheoreticalresearchandpracticehasprovedthatduetoincreasingpressurecasingtubecasingdamageisoneofthemainreasons.Sothemechanismofdamagetoundergroundcasingandconfiningpressureandstressanalysisisessential.Finally,basedonthefactorsthatmaycausecasingdamage,thewritergavesomesolutionstoreducecasingdamage.ThenthewriterdesignedafacilityforcasingdamageandstressanalysisSubjectheading:CasingFailure；ConfiningPressure；StressAnalysis西安石油大学本科毕业设计（论文）目录目录...........................................................................................................................................................1第1章绪论...........................................................................................................................................11.1课题目的与意义.......................................................................................................................11.2国内外研究现状.......................................................................................................................11.3毕业设计的主要内容...............................................................................................................31.4毕业设计的主要方法...............................................................................................................4第2章套管损坏因素及预防措施........................................................................................................52.1地质因素....................................................................................................................................52.1.1围岩压力........................................................................................................................52.1.2泥岩膨胀和蠕变............................................................................................................52.1.3现代地壳运动、地震和滑坡........................................................................................62.1.4油井出砂........................................................................................................................62.2工程技术因素...........................................................................................................................72.2.1固井质量不好................................................................................................................72.2.2水泥返高不够................................................................................................................72.2.3套管质量不合格............................................................................................................82.2.4丝扣不密封....................................................................................................................82.2.5施工不合理....................................................................................................................92.2.6磨损...............................................................................................................................92.2.7注水压力变化................................................................................................................92.3其它因素................................................................................................................................102.3.1射孔.............................................................................................................................102.3.2永冻层解冻和再冻结..................................................................................................102.3.3腐性.............................................................................................................................112.4套管损坏的预防措施.............................................................................................................112.4.1提高套管抗挤压强度加强套管下井前的检测和保护..............................................112.4.2防止注入水窜入软弱底层.