粒子冲击及其辅助钻齿破岩规律研究

doi:10.11885/j.issn.1674-5086.2020.12.11.02

摘要/Abstract

摘要： 粒子冲击钻井是一种新型高效的钻井技术，结合冲击技术和机械破岩，实现了钻头在研磨性硬地层的高效钻进。当前粒子冲击辅助破岩的机理还不够明确，为优化粒子冲击钻井参数，提高钻井效率，基于离散元颗粒流方法，建立了具有微观聚团特性的黑砂岩数值模型。在考虑黑砂岩的矿物组分及占比情况下，研究了粒子在不同粒径、入射角度、入射速度条件下的单粒子冲击、多粒子冲击及辅助切削破岩规律。研究表明： 1）粒子冲击辅助切削破岩相比传统切削破岩效率更高，粒子粒径在1.5和3.0 mm时，破岩比功会呈现急剧降低的现象，粒径在1.5~2.5 mm破岩比功变化不大； 2）粒子粒径、入射角度和入射速度对辅助破岩有重要影响，为提高辅助破岩效率，建议使用粒径为3.0 mm的粒子和0°~25°的入射角度，同时加大入射速度。研究表明，粒子冲击钻井技术是提高研磨性硬地层高效钻进的有效手段，研究结果能为该技术的发展提供一定的指导意义。

关键词: 粒子, 辅助破岩, 离散元, 数值模拟, 破岩效率

Abstract: Particle Impact Drilling (PID) is a new and efficient drilling technology, which combines the impact technology and mechanical rock breaking to realize the efficient drilling of the bit in the abrasive hard formation. At present, the mechanism of particle impact assisted rock breaking is not clear enough. In order to optimize drilling parameters with particle impact and improve drilling efficiency, a numerical model of black sandstone with microscopic cluster characteristics was established based on discrete element particle flow method. By analyzing the mineral composition and proportion of black sandstone, the mechanism of single particle impact, multiple particle impact and auxiliary cutting rock breaking under the conditions of different particle size, incident angle and incident velocity were studied. The research shows that particle impact assisted cutting rock-breaking is more efficient than traditional cutting rock-breaking. When particle size is 1.5 mm and 3.0 mm, the rock-breaking specific work will show a sharp decrease, and the rock-breaking specific work has little change when particle size is 1.5~2.5 mm. Particle size, incident angle and incident velocity have important influences on auxiliary rock breaking. In order to improve the efficiency of auxiliary rock breaking, it is recommended to use particles with particle size of 3.0 mm and incident angle of 0°~5°, with increased impact velocity at the same time. It is concluded that the particle impact drilling technology is an effective means to improve the abrasive hard formation drilling efficiency, and the research results can provide some guidance for the development of this technology.

Key words: particle, auxiliary rock breaking, discrete element, numerical simulation, rock fragmentation efficiency

中图分类号:

TE921

祝效华, 何灵, 刘伟吉, 罗云旭, 阳飞龙. 粒子冲击及其辅助钻齿破岩规律研究[J]. 西南石油大学学报(自然科学版), 2023, 45(5): 152-163.

ZHU Xiaohua, HE Ling, LIU Weiji, LUO Yunxu, YANG Feilong. Research on Particle Impact and Its Auxiliary Rock-breaking Mechanism[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(5): 152-163.

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