岩石内部高压电脉冲等离子体通道生成机理

doi:10.7623/syxb202304010

石油学报 ›› 2023, Vol. 44 ›› Issue (4): 684-697.DOI: 10.7623/syxb202304010

岩石内部高压电脉冲等离子体通道生成机理

刘伟吉^1,2,3, 张有建¹, 罗云旭¹, 祝效华^1,2,3

1. 西南石油大学机电工程学院四川成都 610500;
2. 石油天然气装备教育部重点实验室四川成都 610500;
3. 西南石油大学地热能研究中心四川成都 610500

收稿日期:2022-06-08 修回日期:2023-02-05 出版日期:2023-04-25 发布日期:2023-05-05
通讯作者: 祝效华,男,1978年7月生,2005年获西南石油大学博士学位,现为西南石油大学教授、博士生导师,主要从事管柱力学和钻井提速等方面的研究工作。Email:zxhth113@163.com
作者简介:刘伟吉,男,1989年7月生,2017年获西南石油大学机械工程专业博士学位,现为西南石油大学机电工程学院副教授、硕士生导师,主要从事油气钻井高效破岩理论与方法等方面的研究工作。Email:lwj2017_swpu@163.com
基金资助:
国家自然科学基金项目(No.52004229,No.52034006,No.52225401,No.52274231)、四川省区域创新合作项目(2022YFQ0059)、四川省自然科学基金项目(23NSFSC2099)和南充市与西南石油大学科技战略合作项目(SXHZ004)资助。

Generation mechanism of plasma channels for high-voltage electric pulses in rock

Liu Weiji^1,2,3, Zhang Youjian¹, Luo Yunxu¹, Zhu Xiaohua^1,2,3

1. School of Mechatronic Engineering, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. Key Laboratory of Oil and Gas Equipment, Ministry of Education, Sichuan Chengdu 610500, China;
3. Geothermal Energy Research Center, Southwest Petroleum University, Sichuan Chengdu 610500, China

Received:2022-06-08 Revised:2023-02-05 Online:2023-04-25 Published:2023-05-05

摘要/Abstract

摘要： 高压电脉冲钻井技术具有破岩效率高、井壁质量好等优点,是一种新型破岩方法。为研究岩石内部孔隙特性对其局部电击穿的影响,构建了多孔隙随机分布的多物理场耦合岩石电击穿二维数值模型,从电路场、电流场、击穿场和温度场耦合的角度实现了多孔隙岩石内部高压电脉冲等离子体通道生成及破岩全过程,主要研究了孔隙特征(即孔隙率、孔径大小和孔隙介质)和电极间距对岩石局部电击穿(即岩石内部等离子体形成)的影响规律。数值研究发现,岩石孔隙对电脉冲破岩效率影响较大,当孔隙内介质为空气时,孔隙发生电击穿,等离子体通道贯穿孔隙;当孔隙内介质为水时,孔隙没有被电击穿,等离子体通道沿着孔隙表面延展;随着孔隙率增大,电脉冲的破岩效果逐渐增强;随着孔隙介质水/气比值减小,等离子体通道生成时间减小,电脉冲破岩的效果逐渐加强;随着电极间距的增大,岩石电击穿时刻逐渐减小,岩石内部"电损伤"区域面积减小。通过开展电击穿破岩的室内实验,再现了电脉冲破岩过程及岩石内部等离子通道形态,电击穿实验结果和仿真试验结果相符合。

关键词: 电脉冲钻井, 孔隙岩石, 局部电击穿, 孔隙流体介质, 等离子体通道

Abstract: High-voltage electric pulse (HVEP)drilling technology has become a new rock-breaking method characterized with high rock-breaking efficiency and good borehole wall quality. To study the impact of rock pore characteristics on its partial electric breakdown, this paper establishes a two-dimensional numerical model of multi-physical field coupling electric breakdown with random distribution of multiple pores. Based on this, a whole process of high-voltage electric pulse plasma generation and rock breaking in porous rock is achieved by the coupling of circuit field, current field, breakdown field and temperature field. This paper mainly investigates the law of impact of pore characteristics (i.e., porosity, pore size and pore medium)and electrode spacing on partial electric breakdown of rock (i.e., formation of plasma channel in rock). The numerical research indicates that the porosity of rock has a great impact on the rock-breaking efficiency of high-voltage electric pulses. When the medium in pores is air, electric breakdown takes place in pores, and plasma channel runs through the pores. When the medium is water, there is no electric breakdown in pores, and plasma channel extends along pore surface. As the porosity increases, the rock-breaking effect of electric pulses will be gradually enhanced. As the ratio of pore media water to air decreases, the generation time of plasma channel shortens, and the rock-breaking efficiency of high-voltage electric pulses gradually increases. As the electrode spacing enlarges, the electric breakdown time of the rock gradually shortens, and the area of "electric injury" in rock decreases. In addition, a laboratory experiment on rock breaking by electric breakdown is also carried out to reproduce the process of rock breaking by high-voltage electric pulses and the morphology of plasma channels in rock, and it is found that the experimental results of electric breakdown are consistent with the simulation tests.

Key words: electric pulse drilling, porous rock, partial electric breakdown, pore fluid medium, plasma channel

中图分类号:

TE21

刘伟吉, 张有建, 罗云旭, 祝效华. 岩石内部高压电脉冲等离子体通道生成机理[J]. 石油学报, 2023, 44(4): 684-697.

Liu Weiji, Zhang Youjian, Luo Yunxu, Zhu Xiaohua. Generation mechanism of plasma channels for high-voltage electric pulses in rock[J]. Acta Petrolei Sinica, 2023, 44(4): 684-697.

参考文献

[1] 祝效华,刘伟吉. 旋冲钻井技术的破岩及提速机理[J].石油学报,2018,39(2):216-222.
ZHU Xiaohua,LIU Weiji.Rock breaking and ROP rising mechanism of rotary-percussive drilling technology[J].Acta Petrolei Sinica,2018,39(2):216-222.
[2] 田家林,杨应林,朱志,等.基于旋冲螺杆提速器的井下动力特性[J].石油学报,2019,40(2):224-231.
TIAN Jialin,YANG Yinglin,ZHU Zhi,et al.Downhole dynamic characteristics of an actuator based on rotary screw[J].Acta Petrolei Sinica,2019,40(2):224-231.
[3] 任福深,方天成,程晓泽,等.粒子射流冲击下破岩应力分析与破岩区域[J].石油学报,2018,39(9):1070-1080.
REN Fushen,FANG Tiancheng,CHENG Xiaoze,et al.Rock-breaking stress analysis and rock-breaking region under particle-waterjet impact[J].Acta Petrolei Sinica,2018,39(9):1070-1080.
[4] ANDERS E,LEHMANN F,VOIGT M.Electric impulse technology:long run drilling in hard rocks[C]//ASME 2015 34th International Conference on Ocean,Offshore and Arctic Engineering.St.John's:American Society of Mechanical Engineers,2015:V010T11A008.
[5] 张辉,蔡志翔,陈安明,等.液相放电等离子体破岩室内实验与破岩机理[J].石油学报,2020,41(5):615-628.
ZHANG Hui,CAI Zhixiang,CHEN Anming,et al.Experiments and mechanism of rock breaking by the plasma shock wave generated by underwater discharge[J].Acta Petrolei Sinica, 2020,41(5):615-628.
[6] BOEV S,VAJOV V,LEVCHENKO B,et al.Electropulse technology of material destruction and boring[C]//Digest of Technical Papers.11th IEEE International Pulsed Power Conference (Cat.No.97CH36127).Baltimore:IEEE,1997:220-225.
[7] LISITSYN I V,INOUE H,KATSUKI S,et al.Drilling and demolition of rocks by pulsed power[C]//Digest of Technical Papers.12th IEEE International Pulsed Power Conference.(Cat.No.99CH36358).Monterey:IEEE,1999:169-172.
[8] 章志成.高压脉冲放电破碎岩石及钻井装备研制[D].杭州:浙江大学,2013.
ZHANG Zhicheng.Rock fragmentation by pulsed high voltage discharge and drilling equipment development[D].Hangzhou:Zhejiang University,2013.
[9] 章志成,裴彦良,刘振,等.高压短脉冲作用下岩石击穿特性的实验研究[J].高电压技术,2012,38(7):1719-1725.
ZHANG Zhicheng,PEI Yanliang,LIU Zhen,et al.Experimental research on rock breakdown under short high-voltage pulse[J].High Voltage Engineering,2012,38(7):1719-1725.
[10] WALSH S D C,VOGLER D.Simulating electropulse fracture of granitic rock[J].International Journal of Rock Mechanics and Mining Sciences,2020,128:104238.
[11] VOGLER D,WALSH S D C,SAAR M O.A numerical investigation into key factors controlling hard rock excavation via electropulse stimulation[J].Journal of Rock Mechanics and Geotechnical Engineering,2020,12(4):793-801.
[12] 祝效华,罗云旭,刘伟吉,等.等离子体电脉冲钻井破岩机理的电击穿实验与数值模拟方法[J].石油学报,41(9):1146-1162.
ZHU Xiaohua,LUO Yunxu,LIU Weiji,et al.Electrical breakdown experiment and numerical simulation method of rock-breaking mechanism of plasma electric pulse drilling[J].Acta Petrolei Sinica,2020,41(9):1146-1162.
[13] ZHU Xiaohua,LUO Yunxu,LIU Weiji.On the rock-breaking mechanism of plasma channel drilling technology[J].Journal of Petroleum Science and Engineering,2020,194:107356.
[14] ZHU Xiaohua,LUO Yunxu,LIU Weiji,et al.On the mechanism of high-voltage pulsed fragmentation from electrical breakdown process[J].Rock Mechanics and Rock Engineering,2021,54(9):4593-4616.
[15] BOEV S,VAJOV V,JGUN D,et al.Destruction of granite and concrete in water with pulse electric discharges[C]//Digest of Technical Papers.12th IEEE International Pulsed Power Conference.(Cat.No.99CH36358).Monterey:IEEE,1999:1369-1371.
[16] BIELA J,MARXGUT C,BORTIS D,et al.Solid state modulator for plasma channel drilling[J].IEEE Transactions on Dielectrics and Electrical Insulation,2009,16(4):1093-1099.
[17] 白丽丽,李铮,王营,等.岩石孔隙性质对电脉冲破岩的影响规律[J].特种油气藏,2021,28(1):148-153.
BAI Lili,LI Zheng,WANG Ying,et al.Study on the law of the effect of rock pore properties on the electric pulse rock breaking[J].Special Oil & Gas Reservoirs,2021,28(1):148-153.
[18] VAZHOV V F,GAFAROV R R,DATSKEVICH S Y,et al.Electric-pulse breakdown and the breakage of granite[J].Technical Physics, 2010,55(6):833-838.
[19] 郭建春,任冀川,王世彬,等.裂缝性致密碳酸盐岩储层酸压多场耦合数值模拟与应用[J].石油学报,2020,41(10):1219-1228.
GUO Jianchun,REN Jichuan,WANG Shibin,et al.Numerical simulation and application of multi-field coupling of acid fracturing in fractured tight carbonate reservoirs[J].Acta Petrolei Sinica,2020,41(10):1219-1228.
[20] ZHU Xiaohua,CHEN Mengqiu,LIU Weiji,et al.The fragmentation mechanism of heterogeneous granite by high-voltage electrical pulses[J].Rock Mechanics and Rock Engineering,2022,55(7):4351-4372.
[21] PETROV Y V,MOROZOV V A,SMIRNOV I V,et al.Electrical breakdown of a dielectric on the voltage pulse trailing edge:Investigation in terms of the incubation time concept[J].Technical Physics,2015,60(12):1733-1737.
[22] NOSKOV M D,KUKHTA V R,LOPATIN V V.Simulation of the electrical discharge development in inhomogeneous insulators[J].Journal of Physics D:Applied Physics,1995,28(6):1187-1194.
[23] WIESMANN H J,ZELLER H R.A fractal model of dielectric breakdown and prebreakdown in solid dielectrics[J].Journal of Applied Physics,1986,60(5):1770-1773.
[24] EZZAT M,ADAMS B M,SAAR M O,et al.Numerical modeling of the effects of pore characteristics on the electric breakdown of rock for plasma pulse geo drilling[J].Energies,2022,15(1):250.
[25] HUSAIN E,NEMA R S.Analysis of Paschen curves for air,N₂ and SF₆ using the Townsend breakdown equation[J].IEEE Transactions on Electrical Insulation,1982,EI-17(4):350-353.
[26] SLADE P G,TAYLOR E D.Electrical breakdown in atmospheric air between closely spaced (0.2/spl μ/m-40/spl μ/m)electrical contacts[J].IEEE Transactions on Components and Packaging Technologies,2002,25(3):390-396.
[27] TIRUMALA R,GO D B.An analytical formulation for the modified Paschen's curve[J].Applied Physics Letters,2010,97(15):151502.
[28] LOVELESS A M,MENG Guodong,YING Qi,et al.The transition to Paschen's law for microscale gas breakdown at subatmospheric pressure[J].Scientific Reports,2019,9(1):5669.
[29] ZHANG Zicheng,ZHANG Jiande,YANG Jianhua.Experimental study on high electrical breakdown of water dielectric[J].Plasma Science and Technology,2005,7(6):3161-3165.
[30] 白峰,邱毓昌.利用脉冲功率技术对岩石进行钻孔[J].高压电器,2001,37(2):26-28.
BAI Feng,QIU Yuchang.Drilling of hard rocks using pulsed power technology[J].High Voltage Apparatus,2001,37(2):26-28.
[31] KUZNETSOV Y I,VAZHOV V F,ZHURKOV M Y.Electrical breakdown of solid dielectrics and rocks on the trailing edge of a voltage pulse[J].Russian Physics Journal,2011,54(4):410-415.

岩石内部高压电脉冲等离子体通道生成机理

Generation mechanism of plasma channels for high-voltage electric pulses in rock

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