Rock Breaking Characteristics of a Single Cone-PDC Combined Drill Bit in Hard Formation

被引：5
作者：
Li Q. [1 ]
Fu W. [1 ]
Huang Z. [1 ]
Ma Y. [1 ]
Xie D. [1 ]
机构：
[1] School of Mechatronic Engineering, Southwest Petroleum University, Chengdu
来源：
Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2019年 / 30卷 / 22期
关键词：
Hard formation; Rock breaking mechanism; Rock breaking under tensile stress; Single cone-PDC combined drill bit;
D O I：
10.3969/j.issn.1004-132X.2019.22.006
中图分类号：
学科分类号：
摘要：
A new single cone-PDC combined drill bit was put forward, which relied on a single cone broken rock drilling so as to release ground stresses, thus resulting in rock damage, and then help promote the PDC bit cut rock breaking. The nonlinear dynamics models of rock breaking of combined drill bit, two-stage PDC bit and conventional PDC bit were established by finite element method. By describing the D-P criterion of rock constitutive relation and determining the criterion of rock breakage, the rock breaking mechanism of expanding combined drill bit drilling in hard formation was analyzed, and the comparative study of the dynamic rock breaking processes of 3 drill bits was carried out.The results show that the rock stresses of bottom well wall of expanding combined drill bit are obviously released, which greatly improves the drilling ability of rock formation. Rock breaking under tensile stress is the main reason of expanding combined drill bit enhancing the drilling speed greatly in hard formation. The torsional vibration of expanding combined drill bit is greatly reduced during drilling in hard formation, which leads to higher rock-breaking efficiency and longer life of drill bit. As a result of the effects of single cone collar breaking the rock, the rock burst ability of expanding combined drill bit to the bottom of hole is greater, and the drilling is faster in hard formation. The results provide a reference for the research of new types of singlecone-PDC combined drill bit. © 2019, China Mechanical Engineering Magazine Office. All right reserved.
引用
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页码：2683 / 2690
页数：7
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