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时间:2019-05-11
《同轴旋转双射流冲蚀岩石机制与实验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第27卷增1岩石力学与工程学报Vol.27Supp.12008年6月ChineseJournalofRockMechanicsandEngineeringJune,2008同轴旋转双射流冲蚀岩石机制与实验研究12212罗洪斌,李根生,宋剑,郭春阳,黄中伟(1.中国石油大学石油工程学院,山东东营257061;2.中国石油大学油气资源与探测国家重点实验室,北京102249)摘要:同轴旋转双射流是一种新型高效射流,它综合旋转射流破岩面积大和直射流破岩深度大的优点,并在较高围压下能够利用空蚀提高破岩能力。运用实验的方法研究常压淹没和围压
2、条件下喷距、射流压力以及围压对射流破岩能力的影响。实验结果表明,双射流在冲击破岩时存在最优喷距范围,该次实验条件下最优喷距约为喷嘴当量直径的13倍;增大射流压力可大幅提高双射流的破岩体积。压力超过15MPa时,破岩体积大幅增长。双射流的破岩体积和破岩孔深均随围压的增大而急剧减小,破岩孔径随围压的增大而减小的幅度相对较小。双射流冲蚀破碎岩石机制包括空蚀破坏、直射流冲击破坏、剪切破坏以及压力波动破坏。关键词:岩石力学;同轴射流;旋转射流;冲击流场;破岩机制;围压中图分类号:TU45;TE21文献标识码:A文章编号:1000–6915
3、(2008)增1–2754–06EXPERIMENTALSTUDYONROCKBREAKINGMECHANISMOFCOAXIALSWIRLINGDUAL-JET12212LUOHongbin,LIGensheng,SONGJian,GUOChunyang,HUANGZhongwei(1.SchoolofPetroleumEngineering,ChinaUniversityofPetroleum,Dongying,Shandong257061,China;2.StateKeyLaboratoryofPetroleumResou
4、rcesandProspecting,ChinaUniversityofPetroleum,Beijing102249,China)Abstract:Thecoaxialswirlingdual-jetinheritsboththelargeimpactareaanddeeppenetrationdepthofswirlingjetandroundjetrespectively,whichisgeneratedbyplacingacoaxialroundjetattheaxisofannularswirlingjet.Under
5、highconfiningpressure,thecavitationinceptedbystrongshearofthetwojetscanenhancebreakingrockefficiency.Threeparameters,nozzledistance,jetpressureandambientpressure,arestudiedandtherockbreakingmechanismisdeduced.Theexperimentsdemonstratedthattherockbreakingvolumeincreas
6、esfirstthendecreaseswiththeincreasingofnozzledistance,soanoptimalnozzledistanceexists′whichis13timesofequivalentnozzlediameters.Nozzledistancealsohasgreatimpactsontherockpenetrationdepth.Withtheincreasingofnozzledistance,thepenetrationdepthincreasesfirstthendecreases
7、.Therockbreakingareaisaffectedbynozzledistancetoo.Withtheincreasingofnozzledistance,rockbreakingareahasalmostlinearincreasingtrend.Theincreasingofjetpressurecanlargelyincreasesrockbreakingvolume.Whenthejetpressureisbelowthan15MPa,therockbreakingvolumehardlyincreases;
8、whenthejetpressureisover15MPa,therockbreakingvolumegreatlyincreases.Penetrationdepthwaslargelyincreasedwiththeincreasingofjetpressu
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