反循环气动潜孔锤进气端分流引射接头设计及结构参数分析  

Design of distribution jet joint at inlet port of reverse circulation pneumatic DTH hammer and analysis of its structure parameters

作　　者：李苓豪 王清岩[1,2] 范黎明 盛洁 钟蔚岭 LI Linghao;WANG Qingyan;FAN Liming;SHENG Jie;ZHONG Weiling(College of Construction Engineering,Jilin University,Changchun 130026,China;Key Laboratory of Complicated Conditions Drilling Technology(Jilin University),Ministry of Natural Resources,Changchun 130026,China;Drilling&Production Technology Research Institute,CCDC,Guanghan 618300,Sichuan,China;Water Northeastern Investigation and Design Research Co.,Ltd.,Changchun 130061,China)

机构地区：[1]吉林大学建设工程学院,长春130026 [2]复杂条件钻采技术自然资源部重点实验室(吉林大学),长春130026 [3]中国石油集团川庆钻探工程有限公司钻采工程技术研究院,四川广汉618300 [4]中水东北勘测设计研究有限责任公司,长春130061

出　　处：《世界地质》2024年第2期299-307,共9页World Geology

基　　金：中石油川庆钻采技术研究院与吉林大学合作科研项目(CQZT-ZCY-2017-JS-741)。

摘　　要：为解决反循环气动潜孔锤在钻进过程中岩石重复破碎及排渣效率低下的问题,笔者基于NGQ-320反循环气动潜孔锤设计了进气端分流引射接头。该接头可实现潜孔锤供气量的动态调节,其引射结构可以将部分压缩气体引入中心通道,对井底流场产生泵吸作用的同时改善冲击机构的动力供给;同时采用CFD技术研究了分流引射接头局部流场,分析了喷射孔夹角、喷射孔开口深度、喷射孔直径和喷射孔偏转角度等参数对中心通道抽吸性能的影响,确定了各项结构参数的较优取值。结果表明,分流引射接头在喷射孔开口深度320~330 mm、喷射孔夹角30°~35°、喷射孔直径12 mm、喷射孔偏转角11°~13°的情况下具有较好的抽吸性能。In order to solve the problems of repeated rock crushing and inefficient rock debris discharge during the drilling process of reverse circulation pneumatic down-the-hole hammer,the authors designed a distribution jet joint at the inlet port based on NGQ-320 reverse circulation pneumatic down-the-hole hammer.This joint can realize the dynamic adjustment of the air supply of the down-the-hole hammer,and its injection structure can introduce part of the compressed gas into the center channel,which can improve the power supply of the impact mechanism and conduct pumping effect on the flow field at the bottom of the well at the same time.The authors used CFD technology to study the flow field of the distribution jet joint,discussed the impact of injection hole angle,injection opening depth,injection hole diameter and injection hole deflection angle on the suction performance of the center channel,and determined the optimal values of the various structural parameters.The results show that the distribution jet joint has better suction performance with the injection hole opening depth of 320-330 mm,injection hole deflection angle of 30°--35°,injection hole diameter of 12 mm,and injection hole deflection angle of 11°-13°.

关 键 词：气动潜孔锤 反循环 分流引射接头 计算流体动力学 

分 类 号：P634.5[天文地球—地质矿产勘探]