Mechanism of rock breaking under composite and torsional impact cutting

被引：0
|
作者：
Liu W. [1 ,2 ]
Zeng Y. [1 ]
Zhu X. [2 ]
Ding S. [1 ]
机构：
[1] State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing
[2] School of Mechatronic Engineering, Southwest Petroleum University, Chengdu
来源：
Zeng, Yijin (zengyj.sripe@sinopec.com) | 1600年 / University of Petroleum, China卷 / 44期
关键词：
Composite impact cutting; Drilling; Mechanical specific energy; Rock breaking mechanism; Torsional impact cutting;
D O I：
10.3969/j.issn.1673-5005.2020.03.008
中图分类号：
学科分类号：
摘要：
The composite impact drilling method is developed after the widely used torsional impact drilling technique for improving the rate of penetration in hard rock formations in oil gas well drilling. However, its rock breaking mechanism and advantages over the torsional impact drilling were not fully studied, which can cause a confusion in selecting these two drilling methods. In this paper, a quasi-3D numerical simulation for composite impact cutting was conducted in order to investigate the rock breaking mechanism and in comparison with torsional impact for evaluating the applicability of these two methods in different rock formations. The simulation results show that the rock breaking efficiency of the composite impact cutting with a small single tooth cut depth (<0.6 mm) is higher than that of the torsional impact cutting, while the torsional impact cutting has a higher efficiency than that of the composite impact cutting when a medium tooth cut depth (0.6-1.2 mm) is used, and for large tooth cut depth (>1.2 mm), the performance of the two methods is similar. The axial impact amplitude has less influence on rock breaking efficiency, but the influence of the impact frequency can be more significant. Both of these two drilling methods are not applicable to soft rock formations. © 2020, Editorial Office of Journal of China University of Petroleum(Edition of Natural Science). All right reserved.
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页码：74 / 80
页数：6
相关论文
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