Projectile drilling system

The material is weakened by accelerating a projectile to contact the material in a wellbore. The weakened material is then drilled through using a drill bit. To accelerate the projectile, an end cap is placed in a conduit using a gas source. The end cap isolates the conduit from the external environment. A projectile is then positioned in the conduit over the end cap. Movable members within the conduit are operated in sequence to enable a single end cap and projectile to move into the conduit. Gas from the conduit is emptied into an annulus between the conduit and a surrounding conduit, and propellant material is provided into the conduit. The propellant material applies a force to the projectile to accelerate the projectile into contact with the geological material. Fluid is circulated along a second annulus external to the surrounding conduit to contact the drill bit and remove debris. 通过将射弹加速以与井眼中的地质材料接触来弱化所述材料。然后使用钻头钻穿所述弱化的材料。为了将所述射弹加速，使用气体源将端盖放置在导管中。所述端盖将所述导管与外部环境隔离。然后将射弹在所述端盖上方定位在所述导管中。按顺序操作所述导管内的可移动构件以