The purpose of study of this subject is to give general information about technologies and technical means used in various varieties in drilling practice, especially these technologies which are used in geological, geotechnical, hydrogeological works and works in engineering geology etc. The main attention in the field of drilling technologies will be paid to these areas: exploratory drilling, drilling in quarries - blast hole drilling, drilling in construction building, water – well drilling and underground (mine) drilling. There are these three main types of drilling in the field of drilling technology – rotary, percussion and rotary – percussion drilling in these two variants – full-profile drilling and core drilling. The attention will be paid to the drilling machines, drilling and casing strings etc. Very important part of study will be focused to study of a new technologies of drilling, especially technique and technology of drilling using down – the – hole hammers. This technology represents one of the modern technologies, most used in drilling practice.