Effect of the number of irradiation holes on rock breaking under constant laser energy

作     者：Hai-Zeng Pan Yi Hu Yong Kang Ze-Feng Wang Jia-Wei Liu Hao Chen Meng-Da Zhang Hai-Zeng Pan;Yi Hu;Yong Kang;Ze-Feng Wang;Jia-Wei Liu;Hao Chen;Meng-Da Zhang

作者机构：Hubei Key Laboratory of Waterjet Theory and New TechnologyWuhan UniversityWuhan430072HubeiChina School of Power and Mechanical EngineeringWuhan UniversityWuhan430072HubeiChina The Institute of Technological SciencesWuhan UniversityWuhan430072HubeiChina School of Urban ConstructionWuhan University of Science and TechnologyWuhan430081HubeiChina Jianghan Machinery Research Institute Limited Company of CNPCWuhan430000HubeiChina 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2022年第19卷第6期

页      面：2969-2980页

核心收录：

学科分类：0820[工学-石油与天然气工程] 082001[工学-油气井工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(No.52174004 and No.51804318) the National Key Research and Development Program of China(No.2018YFC0808401) 

主　　题：Number of irradiation holes Rock breaking Fracture tortuosity Macrofracture 

摘      要：The use of mechanical drilling in accessing energy resources stored in deep and hard rock formations is becoming increasingly ***,laser irradiation has emerged as a novel drilling method with considerable in this *** study examines the variation of rock fracture length,fracture tortuosity,hole size,and rock breaking efficiency for a different number of holes and laser power,based on the constant total energy of laser *** indicated by the results,increasing the laser power increases the laser intensity,which helps increase the hole diameter and ***,for the same laser power,increasing the number of irradiated holes reduces the laser energy absorbed by each hole,which is not conducive to increasing the hole *** the number of holes increases,the mass loss of the rock also increases,while both specific energy(SE)and modified specific energy(MSE)*** the number of holes remains the same,the mass of the shale removed by low power is less than that removed by high power,while SE and MSE have an inverse relation with ***,high laser power and multiple-hole irradiation are more conducive to rock ***,the fracture length and fracture tortuosity of the rock irradiated by the low laser power will increase first and then decrease with the increase in the number of holes,and reach the peak value when the irradiation takes place through three *** a high-power laser irradiates the rock,the fracture length and tortuosity will increase with the increase in the number of irradiation *** is because a rock irradiated by low power dissipates more energy,with the result that the energy absorbed by the sample with four irradiation holes is not enough to break the rock *** study is expected to provide some guidance to break rock for drilling deep reservoirs and hard rock formations using laser irradiation.