随钻扩眼器管柱动力学振动分析及抑制研究

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中图分类号：TE921文献标识码：A DOI：10.12473/CPM.202410023

Abstract：In the applicationofream while driling technology，there are stillseveral issuessuchas severe vibrationofdrillstring system leading to cuter fragmentationand thread joint failure，complex stress stateof long string under complex drilling conditions，andthe need to extendthelifeofthereamer.In viewofthis，first，based on the interaction relationship between the reamer while drilling （RWD）and the rock described by the spring damping mechanical modelof equivalent cuter，a nonlinear mechanical model of the interaction between the RWD andthe downholerock was built.Second，onthebasisof analyzing the cuter-rock interaction，with the helpof the multi-bodydynamics method，after having taken into account the influentialfactors suchaskeystructural characteristics ofdrilling tool，casing program，formation lithologyand driling fluid，a dynamicanalysismethod for the whole well string of theRWDwas established.Finally，basedon the wellore trajectoryofafieldwell，the variationof radial loads acting between the blade gauge faceof RWDand the sidewallrock under diferent drilling parameters and botom hole assembly configurations （centralizer OD and position），as well as the variation of three-direction acceleration ofthe RWDover time，were analyzed.Theresearch results show thatthe vibration of theRWD ismainly manifestedas torsionaland lateral vibrations，andtheaxial vibration isrelativelysmallThe sensitivity ofthe three-direction vibration to therotational speed is greater than thatof the weight on bit（WOB）， and when the rotational speed is 70r/min ，the three-direction vibration of theRWDis the weakest，followed by the rotational speedof8O r/minand9O r/min.Appropriately increasing theouter diameterof thecentralizer is beneficial to reduce the vibrationof the RWD，but when the outer diameter exceeds 2O8 mm，thedegreeof change of this effect is not much diferent.The research results provide theoretical guidance for the design andapplication of RWD.

Keywords：reaming while drilling；string vibration；radial load；root mean square of acceleration；bottom hole assembly；drilling parameter

0 引言

随着全球油气勘探开发向深层和超深层发展，深井超深井复杂地层钻完井面临井眼垮塌、缩径和固井质量低等问题[1-3]，严重制约了深层油气资源的勘探开发。（剩余12358字）