不同介质条件下激光照射岩石实验研究  

Experimental Study on Laser Irradiation of Rocks under Different Media Conditions

作　　者：李美艳[1] 韩彬[1] 张世一[1] 孙嘉楠 王勇[1] 赫庆坤[2] Li Meiyan;Han Bin;Zhang Shiyi;Sun Jianan;Wang Yong;He Qingkun(College of Electromechanical Engineering, China University of Petroleum, Qingdao, Shandong 266580, China;Experiment Center of College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China)

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580 [2]山东科技大学材料科学与工程学院实验中心,山东青岛266590

出　　处：《应用激光》2017年第5期709-714,共6页Applied Laser

基　　金：山东省自然科学基金资助项目(项目编号:ZR2014EEQ037);石油天然气装备教育部重点实验室(西南石油大学)资助项目(项目编号:OGE201403-04);中央高校基本科研业务费专项资金资助项目(项目编号:15CX05020A;16CX06018A)

摘　　要：在不同介质条件下采用高功率密度激光照射花岗岩和砂岩,分析激光工艺参数对岩石破碎比能和射孔尺寸的影响。结果表明,干燥、饱和水、饱和钻井液三种花岗岩试样,获得最小比能的激光功率分别是800、800和1 000 W,而砂岩对应的激光功率分别是800、1 000和1 200 W。随着功率和照射时间的增加,两种岩石的射孔尺寸逐渐增大。相同条件下干燥花岗岩试样的激光射孔尺寸最大,饱和水试样次之,饱和钻井液试样最小。对于砂岩,激光功率一定时,饱和钻井液试样的射孔尺寸小于另外两组试样。花岗岩原始抗拉强度为10.11 MPa,三种介质条件下激光处理后抗拉强度分别降至5.82、4.12和5.02 MPa。原始干燥砂岩的抗拉强度约为5.07 MPa,激光照射后抗拉强度降至2.36、2.07和1.06 MPa。此外,激光处理后岩石可钻性级数也随之降低,且花岗岩试样降低幅度大于砂岩。Granite and sandstone with high power density laser irradiation under different media conditions,the effects of laser process parameters on the crushing ratio and the perforation size of the rock are analyzed.The results show that for the dry,saturated water and saturated drilling fluid granite samples,laser power which can obtain the minimum specific energy is800 W,800 Wand 1 000 W,respectively.For the sandstone samples,the corresponding laser power is 800 W,1 000 Wand1 200 W,respectively.With the increase of power and irradiation time,the perforation size of the two kinds of rocks increases gradually.Under the same conditions,the size of the laser perforation of the dry granite sample is the largest,the saturated water sample is the second,and the saturated drilling fluid sample is the smallest.For sandstone,when the laser power is constant,the perforation size of the saturated drilling fluid sample is smaller than that of the other two samples.The original tensile strength of granite is 10.11 MPa,and the tensile strength under the three kinds of media decreases to 5.82 MPa,4.12 MPa and 5.02 MPa,respectively.The tensile strength of the original dry sandstone is about 5.07 MPa,and the tensile strength decreases to 2.36 MPa,2.07 Mpa and 1.06 MPa after laser irradiation.In addition,the rock drillability series decreases after laser irradiation,and the decrease of granite is larger than that of sandstone.

关 键 词：破岩介质 激光技术 岩石 力学性能 可钻性 

分 类 号：TE245[石油与天然气工程—油气井工程] TN249[电子电信—物理电子学]