Key factors influencing rock breaking efficiency of high voltage electric pulse

被引：0
|
作者：
Liu W. [1 ,2 ,3 ]
Zhang Y. [1 ]
Zhu X. [1 ,2 ,3 ]
Hu H. [1 ]
He L. [1 ]
Chen M. [1 ]
机构：
[1] School of Mechatronic Engineering, Southwest Petroleum University, Sichuan, Chengdu
[2] MOE Key Laboratory of Oil and Natural Gas Equipment, Sichuan, Chengdu
[3] Geothermal Energy Research Center, Southwest Petroleum University, Sichuan, Chengdu
来源：
Natural Gas Industry | 2023年 / 43卷 / 10期
关键词：
Electric pulse–mechanical composite rock breaking; Electrode structure; Heterogeneous granite; High voltage electric pulse; Rock breaking mechanism;
D O I：
10.3787/j.issn.1000-0976.2023.10.012
中图分类号：
学科分类号：
摘要：
With the increasing depth of exploration and development wells for oil, natural gas and geothermal resources, the traditional mechanical drilling method shows the shortcomings of low efficiency and high energy consumption and can hardly meet the demands of deep and ultra deep drilling. After systematically analyzing and summarizing the rock-breaking mechanism of high voltage electric pulse, the rock-breaking types by electric discharge and the principle of electric pulse drilling, this paper studies the influences of electrical structural parameters, rock characteristic parameters and electrode structural parameters on the rock breaking efficiency of high voltage electric pulse in the process of rock breaking. Then, the development trend and research direction of electric pulse drilling technology are discussed. Finally, a new efficient rock breaking technology, i.e., electric pulse–mechanical composite rock breaking technology, is proposed. And the following research results are obtained. First, the electrical parameters in the rock breaking process of high voltage electric pulse have a significant influence on rock breaking efficiency. Second, rock internal fractures, fracture inclination and fracture degrees also have a direct influence on rock breaking efficiency. Third, the structural design of electrode bit shall be based on the flow field distribution at the bottom hole, combined with the high temperature ablation factor. Fourth, the composite bit combines high voltage electric pulse rock breaking technology with mechanical rotary drilling technology, which introduces the efficient rock breaking capacity of electrode bit while reserving the ability of mechanical bit to repair the wellbore wall, ensuring long drilling time in hard strata and improving its drilling efficiency. In conclusion, as a new type of efficient rock breaking technology, the rational application of the high voltage electric pulse rock breaking technology provides a beneficial reference for the innovation of ROP improvement technologies, and its combination with mechanical drilling to form a new drilling technology enables the low-cost efficient drilling in deep poor-drillability strata and hot dry rock strata. © 2023 Natural Gas Industry Journal Agency. All rights reserved.
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页码：112 / 124
页数：12
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