Considering the constraints of small boreholes in deep wells on burst height and the influence of penetrating the perforating fluid， a typical deep-well charge-casing combination with an outer diameter of 139.70 mm and wall thickness of 9.17 mm casing， paired with a perforating gun with an outer diameter of 89.00 mm， was modeled using the mesh node method to establish a three-dimensional SPH model of the perforating bullet. The effects of the perforating charge''s burst height and jet inclination angle on penetration performance were analyzed. The study shows that t he mesh-node conversion method for SPH particle modelling results in more uniform particle distribution and smoother boundary particle arrangement compared to the mesh centered method. Under typical deep well oil casing and gun-bullet conditions， increasing the detonation height from 12 mm to 18mm reduced the maximum axial velocity by 7.72%， while further increasing it from 18 mm to 24 mm decreased the maximum axial velocity by 5.27%. At an inclination angle of 60°， the metal jet impact velocity was 6564 m·s^-1， whereas at 45°， it was 6283 m·s^-1， showing a 4.28% reduction. The differences in maximum energy and residual energy of the metal jets between the two inclination angles were relatively small， with variations of 1.05% and 2.5%， respectively.