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ID:37678215
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页数:8页
时间:2019-05-28
《钻柱纵向和扭转振动分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第21卷第6期工程力学VO1.21No.62004年12月ENGINEERINGMECHANICSDec.2OO4文章编号:1000-4750(2004)06-0203-08钻柱纵向和扭转振动分析李子丰,张永贵,侯绪田2,刘卫东2,徐国强2(1.燕山大学,秦皇岛066004:2.中石化钻井研究所,德州253005)摘要:介绍钻柱的振动状态和产生振动的原因。针对钻柱的纵向振动,分别建立了力激励法和位移激励法的数学模型;计算结果表明,力激励法与位移激励法求得的消振转速相反,即力激励法的消振转速恰恰是
2、位移激励法的共振转速,反之亦然;传统多以力激励为边界条件来研究钻柱纵向振动的频率响应,并指导现场消振作业的,这样给出的最佳消振转速,恰恰是共振转速;在钻井作业中,钻头的纵向跳动比纵向受力的变化要稳定得多,钻柱的动负荷比动位移重要得多,应该用位移激励法研究钻柱的纵向振动问题。针对钻柱的扭转振动问题,分别建立了扭矩激励法和转角激励法的钻柱扭转振动数学模型;证明用转角激励法来研究钻柱的扭转振动更符合实际。关键词:钻井工程;钻柱;纵向振动;扭转振动;数学模型;共振;消振中图分类号:0326文献标识码:A
3、ANALYSISOFLONGITUDINALANDToRSIoNVIBRATIoNoFDIULLSTIUNGLIZi—fengl,ZHANGYong—guil,HOUXu—tian,LIUWei—dong,XUGuo—qiang(1.YanshanUniversity,Qinhuangdao066004,China;2.PetroleumDrillingResearchInstitute,SINOPEC,Dezhou253005,China)Abstract:Thestateofvibratio
4、nfordrillstringsandthecauseofvibrationaredescribedinthisPaper,Fortheproblemoflongitudinalvibration,mathematicalmodelsaleestablishedfortheforceanddisplacementexcitationmethods,respectively.Thecalculationresultsindicatethattherotationvelocityofanti—vib
5、rationbyforceexcitationmethodisinoppositetothatbydisplacementexcitationmethod.Therotationalvelocityofanti—vibrationbyforceexcitationmethodisjusttheresonantrotationalvelocitybydisplacementexcitationmethod,andviceversa.Traditionally,tostudythefrequency
6、responseoflongitudinalvibrationford'rillstring,theforceexcitationisappliedtotheboundarycondition,whichisusedtoguidetheoperationofanti—vibrationonsite.Thus,itprovidesthebestanti—vibrationrotationvelocity,whichisjusttheresonantrotationalvelocity.Intheo
7、peration,sincethelongitudinaljumpOfdrillsismuchstablethanthevariationoftheforceandthedynamicforceismoreimportantthanthedynamicdisplacement,thedisplacementexcitationmethodshouldbeusedtostudythelongitudinalvibrationfordrillstrings.Fortheproblemoftorsio
8、nvibrationofdrillstring,themathematicalmodeloftorsionmomentexcitationmethodandrotationalangleexcitationmethodareestablished,respectively.Itisconcludedthattherotationalangleexcitationmethodshouldbeusedtostudythetorsionvibrationofdrillstrings.Keywords:
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