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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。
Under different media conditions, high power density laser was used to irradiate granite and sandstone. The influence of laser processing parameters on rock crush specific energy and perforation size was analyzed. The results show that the laser powers of the three kinds of granite samples with dry, saturated and saturated drilling fluid are 800,800 and 1000 W, respectively. The corresponding laser power of sandstone is 800, 1000 and 1 200 W, respectively . With the increase of power and irradiation time, the perforation sizes of the two rocks gradually increased. Under the same conditions, the size of 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 was 10.11 MPa, and the tensile strength of laser treatment was decreased to 5.82, 4.12 and 5.02 MPa respectively under the three media conditions. The tensile strength of the original dry sandstone is about 5.07 MPa, and the tensile strength after laser irradiation is reduced to 2.36, 2.07 and 1.06 MPa. In addition, the laser drillability of rock series also will be reduced, and granite samples to reduce the magnitude of sandstone.