常规液压钳钳牙对防腐蚀合金套管磨损破坏行为分析.pdfVIP

2016年 2月 润滑与密封 Feb．2016 第41卷 第 2期 LUBRICATION ENGINEERING Vo1．4lNo．2 DOI：10．3969／j．issn．0254—0150．2016．02．023 常规液压钳钳牙对防腐蚀合金套管磨损破坏行为分析 徐建宁 周 欣 (西安石油大学机械工程学院 陕西西安 710065) 摘要：目前油田普遍采用的防腐蚀合金 (CRA)套管材质较软。工作时常规动力钳易破坏管两端处的表面镀锌 层．加速硫化氢对套管的腐蚀。为减轻液压管钳对套管损伤，减缓硫化氢对套管的腐蚀 ，基于普通液压管钳工作原 理．建立钳121力学模型，确定影响管钳加紧的具体因素。根据摩擦疲劳学理论，分析钳牙对套管的磨损成因和磨损过 程，通过钳牙与油管上卸扣实验发现，磨损与接触区域、循环次数、相互接触材料等因素有明显关系。通过分析接触 区域的应力应变，表明影响钳牙对套管的磨损的主要因素是摩擦因数、接触载荷。并且摩擦因数对拉伸应变的影响更 加明显 。 关键词：硫化氢腐蚀；套管；液压管钳；钳牙；摩擦损伤 中图分类号：TH117．1 文献标志码：B 文章编号：0254—0150 (2016)02—116-05 BehaviorAnalysisofCorrosionResistantAlloysCasingW earDamage byClampJawsofConventionalHydraulicTongs XUJianning ZH0UXin (SchoolofMechanicalEngineering，Xi’anShiyouUniversity，Xi’anShaanxi710065，China) Abstract：Thegalvanizedlayeronbothendsofthecorrosionresistantalloys(CRA)casingsu~aceiseasilytobedam— agedbytheconventionalpowertongsduringworkingforthematerialofCRA casingusuallyusedintheoilfieldisrelative— lysoft，whichwillacceleratethehydrogensulfidecorrosionofthecasing．Inordertoreducingthedamageofhydraulictongs oncasing，andslowdownthecorrosionofhydrogensulfideoncasing，basedontheworkingprincipleoftheconventional hydraulicpowertongs，themechanicsmodelofjawswassetup，andthespecificfactorsaffectingtongstighteningwerede— termined．Accordingtothetribologicaltheoryoffatigue，causesandprocessofwearofthecasingbyjawswereanalyzed． Throughtheexperimentsofscrew—on-offbythejawsonoilpipe，theresultshowsthatwearhasobviousrelationshipwith contactarea，numberofcycles，themutualcontactmaterialsandotherfactors．Throughthestressandstrainanalysisofcon— tactarea，itisshownthatfrictioncoefficientandcontactloadarethemajorfactorsinfluencingthecasingwearbyjaws，and thefrictioncoefficienthasmoreobviousinnuenceo