高压电脉冲在页岩气开采中的压裂实验研究  

Research of rock fracturing based on high voltage pulse in shale gas drilling

作　　者：付荣耀[1] 孙鹞鸿[1] 樊爱龙[1,2] 高迎慧[1] 严萍[1] 周健[3] 

机构地区：[1]中国科学院电工研究所电力电子与电气驱动重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]中国石油化工股份有限公司石油工程技术研究院,北京100101

出　　处：《强激光与粒子束》2016年第7期186-190,共5页High Power Laser and Particle Beams

基　　金：中国石油化工股份有限公司前瞻性研究项目(P13014)

摘　　要：基于液电效应原理,采用高压电脉冲放电对模拟岩样及实际砂岩岩样进行了压裂实验研究.脉冲电源最大储能40kJ/20kV,放电电流最高可达70kA.实验结果表明,高压电脉冲能够在岩样中造成非常明显的裂缝,可以在多个方向上造出多条具有一定高度（最大0.32m）的裂缝,近井筒裂缝无明显的扭曲,裂缝的形态与放电电压、能量及放电次数有关.对模拟岩样压裂后产生的裂缝进行了三维形貌分析,得到裂缝的表面平均粗糙度在0.430-1.075mm 之间,具有-定的导流能力.Based on the'electro-hydraulic effect',rock fracture experiments were conducted on the artificial rock samples and the real sandstone samples.A pulsed power supply with a stored energy of 40kJ/20 kV was developed.Experimental results show that large multi-fractures could be generated,the maximum length of the fracture in the vertical direction was 0.32 m.The shape of the fracture is related to the stored energy,the discharge voltage,the discharge times and the rock mechanical parameters.The 3-D morphology analyzer was used to observe the surface configuration of the fracture.The fractures have no obvious tortuosity in the near borehole area,and all the fractures generated by the pulsed discharge have certain average roughness in the range of 0.430-1.075 mm,which are capable of forming conductivity ability.

关 键 词：液电效应 脉冲放电 岩石压裂 三维形貌分析 粗糙度 

分 类 号：TM89[电气工程—高电压与绝缘技术]