Combined laser–mechanical rock breaking drilling is an emerging technology that uses laser-assisted mechanical rock breaking to efficiently drill wells. A physical model of rectangular and circular laser spot scanning rock breaking is developed using the energy conservation theorem and heat transfer related theories, and the reasonableness of the model is analyzed through a combination of experiments and simulations. The effect of two kinds of scanning spots on the strength and drillability of granite was also obtained experimentally, and the effect of two kinds of laser spot scanning on rock breaking was evaluated. The results show that the uniaxial compressive strength of the rock decreases by 24% and 15%, the tensile strength by 20% and 11%, and the drillability by 16% and 10%, respectively, after scanning the granite with rectangular and circular laser spots at the stated parameters, and that the rock breaking effect of the rectangular scanning spot is better than that of the circular scanning spot.

激光机械联合破岩钻井是一种利用激光辅助机械破岩高效钻井的新兴技术。利用能量守恒定理和传热相关理论，建立了矩形和圆形激光光斑扫描破岩物理模型，并通过实验和仿真相结合的方法分析了模型的合理性。还通过实验得到了两种扫描光斑对花岗岩强度和可钻性的影响，并评价了两种激光光斑扫描对岩石破岩的影响。结果表明，岩石单轴抗压强度分别下降24%和15%，抗拉强度分别下降20%和11%，可钻性分别下降16%和10%，