Electrical breakdown experiment and numerical simulation method of rock-breaking mechanism of plasma electric pulse drilling

被引：0
|
作者：
Zhu X. [1 ]
Luo Y. [1 ]
Liu W. [1 ]
Gao R. [2 ]
Jia Y. [2 ]
Liu C. [3 ]
机构：
[1] School of Mechatronic Engineering, Southwest Petroleum University, Chengdu
[2] ENN Science and Technology Development Co., Ltd., ENN Energy Research Institute, Langfang
[3] Engineering Technology Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2020年 / 41卷 / 09期
关键词：
Electric pulse drilling tool; Electrical breakdown; High-voltage electric pulse; Numerical simulation method; Plasma channel drilling technology; Rock-breaking mechanism;
D O I：
10.7623/syxb202009011
中图分类号：
学科分类号：
摘要：
This paper introduces and studies a kind of high-efficiency rock breaking drilling technology, i.e., plasma electric pulse drilling technology. First, electric pulse breakdown experiments were carried out on 4 kinds of rocks at a fixed output voltage of 80 kV and a dual frequency of 2.5 Hz. The experiment results present two types of crushing morphology, i.e., throughout crushing and non-throughout crushing, and the relevant reasons are also analyzed. Then, from the perspective of electrical breakdown, this paper first determines the evaluation index of single-pulse rock breaking efficiency, namely energy conversion efficiency ηe, and proposes a new dielectric breakdown model for rock, namely the probabilistic development model (PDM). With the help of PDM and the simplified electrical breakdown circuit, this paper studies the general influence laws of the circuit structure parameters on the distribution of rock-breaking energy consumption during single-pulse breakdown. Finally, based on the parameters of the electric pulse breakdown experiment and the trajectory of the plasma channel generated by PDM, this paper proposes a numerical simulation method for studying the rock-breaking mechanism of plasma electric pulse drilling technology, and studies the rock-breaking law of the electrode drilling tool with a diameter of 41 mm at the peak voltage of 60 kV under the formation pressure of 0-30 MPa. © 2020, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：1146 / 1162
页数：16
相关论文
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