Tooth arrangement design of retractable DTH hammer bit used for drilling while casing  

作　　者：ZHANG Boyao CHEN Baoyi YANG Da BO Kun CAO Pinlu 

机构地区：[1]College of Construction Engineering,Jilin University,Changchun 130061,China

出　　处：《Global Geology》2023年第1期40-46,共7页世界地质（英文版）

基　　金：Project of National Key Research and Development of China(No.2018YFC1505303).

摘　　要：Down-the-hole(DTH)hammer with casing while drilling(CWD)is a technology that has been proven to be able to alleviate many of the problems faced by complex formations.However,the drill bit is suffered from rapid wear,low drilling efficiency,and high energy consumption due to the unreasonable tooth arrangement and impact energy selection in drilling process,which affect the application effect of this technology.ABAQUS software was used for numerical simulation of rock breaking behavior under impact load with the single,three,and five teeth arrangement drill bit respectively,to improve the application effect and solve the aforementioned technical problems.Based on the calculated parameters of tooth arrangement,we designed a novel drill bit for hard rocks and provided a theoretical basis for the tooth arrangement of largediameter drill bits.

关 键 词：casing while drilling drill bit tooth arrangement rock breaking ABAQUS 

分 类 号：TE2[石油与天然气工程—油气井工程]