Study on the mechanism of multidimensional cutting teeth and the influencing factors of rock breaking efficiency

被引:2
作者
Chen, Lin [1 ,2 ]
Li, Debo [2 ]
He, Jingbin [2 ]
Meng, Leifeng [3 ]
Chi, Qifu [3 ]
Li, Gang [2 ]
Chen, Weilin [2 ]
Zhao, Ying [2 ]
Yi, Xianzhong [2 ]
Xia, Chengyu [1 ]
机构
[1] Yangtze Univ, Jingzhou, Peoples R China
[2] CCDC Changqing Gen Drilling Co, Changqing, Peoples R China
[3] LTD Downhole Operat Co, China Petr West Drilling Engn Co, Sanhe, Peoples R China
来源
PLOS ONE | 2024年 / 19卷 / 03期
关键词
STRENGTH CRITERIA; SIMULATION;
D O I
10.1371/journal.pone.0297176
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The innovative cutting mechanism of multi-dimensional teeth presents a groundbreaking approach to drill bit design, particularly optimizing drilling efficiency in challenging geological formations such as interlayers and gravel-rich layers within the Changqing Oilfield. Nevertheless, compared to conventional flat-tooth PDC drill bits, several aspects of the cutting mechanism and design parameters for multi-dimensional teeth require further elucidation. This article employs a linear cutting finite element model to establish cutting models for traditional flat teeth and two distinct types of multi-dimensional teeth, designated as Ridge and Benz. It systematically investigates the influence of varying cutting parameters on the effectiveness of rock-crushing within the multi-dimensional tooth-cutting mechanism. This study conducts laboratory-based single-tooth rock-crushing experiments to validate the numerical simulation results. Furthermore, applying principles derived from soil plastic mechanics contrasts the stress states experienced by rocks during the rock-crushing process between multi-dimensional teeth and conventional flat teeth, shedding light on the rock-crushing mechanism employed by multi-dimensional teeth. This research categorizes PDC cutting teeth on the drill bit into two groups: those near the center and those near the outer shoulder. A linear cutting model for teeth positioned near the outer shoulder is developed to analyze the impacts of different rake angles, side clearance angles, and welding errors on the tooth helix angle and the rock-crushing efficiency of the Benz tooth. This comprehensive study is a valuable reference for tailored drill bit design and holds potential for publication in a prestigious scientific journal.
引用
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页数:20
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