直旋混合射流破岩钻孔参数试验研究  

Experimental Study on Rock Breaking Parameters of Combined Swirling and Round Jet

作　　者：吴为[1] 李根生[1] 牛继磊[2] 黄中伟[1] 田守嶒[1] 

机构地区：[1]中国石油大学(北京),北京102249 [2]中国石油大学(华东),山东东营257061

出　　处：《流体机械》2009年第6期1-6,共6页Fluid Machinery

基　　金：国家"863计划"课题(2007AA09Z315);高等学校博士学科点专项科研基金(20070425006)

摘　　要：直旋混合射流是由通过喷嘴叶轮中心孔的直射流和叶轮加旋槽产生的旋转射流经混合段混合而成的一种新型高效射流,它综合了旋转射流破岩面积大和直射流破岩深度大的优点。试验研究了叶轮中心孔直径、混合段长度、扩展腔扩展角、喷距和压力等5个主要参数对直旋混合射流破岩效果的影响规律。结果表明,叶轮中心孔直径为2mm、混合段长度为8mm、扩展腔扩展角为60°的喷嘴产生的射流具有较强的破岩能力;试验条件下,直旋混合射流破岩最优喷距约为喷嘴出口直径的6倍;增大射流压力可以大幅提高直旋混合射流的破岩体积。Combined swirling and round jet is a new kind of high efficient jet,which is formed by combing round jet that was generated by the central hole of impeller and swirling jet that was generated by the spiral slots of impeller. The combined swirling and round jet inherits both the large impact area of swirling jet and deep penetration depth of round jet respectively. The influences of nozzle structural parameters,standoff distance and jet pressure on rock erosion effect were researched by rock breaking experiment. The results show that the combined swirling and round nozzle with a diameter of 2mm and a mixed length of 8mm and a expansion angle of 60°can produce larger rock breaking volume. The optimal standoff distance is 12ram, the rock breaking area and penetration depth will sharply increase with the increasing of pump pressure.

关 键 词：直旋混合射流 旋转射流 破岩效果 喷距 射流压力 

分 类 号：TE248[石油与天然气工程—油气井工程]