双活塞轴向振荡减阻工具动力学特性与试验

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中图分类号：TE929 文献标志码：A

Abstract：Aimingattheproblemoflowdrillng eficiencyinlonghorizontalborehole，adual-pistonaxialoscilltiondragreduction tool was proposed.Basedonthe groundconditions，these parameters of thistol，includingthepressuredrop，axial displacementandoscilltingacceleration，were testedunderdifferent inputflowrates.Accordingtoengineeing background， Theinternalworking mechanismofthisdual-pistonaxialoscilationdrag reductiontool was studied，suchasestablishing the axial pressuredropcalculationmodels，deducting theaxialdisplacement modelofdamped elasticrodwithspecifiedexcitation，analyzing theelatioshpsbetweenpressuredrop，axialdisplacementandflow，anddiscussngthedynamiccharacteristics.Theexperimentalresultsverifiedthecorectness oftheory models，andthenumericalinfluenceofinputflowonpressure drop，axialdisplacement，frequencyandaxial force.Theresultsshowthatthe working frequencyis positivelycorelated with theinputflow，and thesmallertheinputflowrate，thelessimpactithasontheoscillting force.Theapplicationof this innovative toolcanreducethefrictionbetweenthebottmholeassembly（BHA）andtheboreholewall，andimprovethedrilling efficiency.

Keywords：axial vibration；dynamics；driling；oscillation drag reduction tool；experimental testing

非常规油气资源对中国能源安全和社会经济发展具有战略意义，是现有技术条件下油气工业化勘探的重要领域和目标[1-2]。（剩余11798字）