Core drilling is one of the types of rotary technology. In other words, core drilling can be defined as rotary drilling in hard rock. A characteristic feature of this technology is that penetration into the deep layers of the rock is carried out along the annular, and not along the entire area of the drilling rig. Removal of rock from the well to the surface is carried out using a specially designed flushing fluid, which is injected into the well using a mud pump.