Until recently, the main way to combat the loss of flushing fluid, well wall collapses in rocky rocks broken by tectonic fractures, was casing. But, as it is known, the use of casing pipes is associated with loss of diameters, so under difficult geological conditions, multi-column well designs are obtained and initial diameters are increased. This leads to additional complications, as the basic rule of drilling is violated: the smaller the diameter of wells, the less wall collapses and the more productive the work is, all other things being equal. Currently, this provision is generally accepted, in connection with which in all countries are moving in the exploration of solid minerals to drilling with drill bits d 46-59 mm in one-stage design of wells, ie, fix the upper unstable rocks pipes, and then drilling is carried out without casing.