Development of theoretical bases of percussive-rotary drilling

Abstract

The percussive-rotary method of drilling has found in recent years increasingly widespread use both in the USSR and abroad. When sinking explosive wells pneumatic percussion drilling units confidently displace low-productive percussion-rotary machines. Shock-rotating machines for borehole drilling in underground workings have appeared. A number of research organizations of our country are working on the creation of hydraulic percussion machines for sinking exploration and production wells. However, the theoretical basis of percussive-rotary drilling is very poorly studied, despite more than half a century of research history of this undoubtedly progressive method of rock destruction. If now it is possible to point out certain successes in the field of design and study of different kinds of percussive-rotary machines, at the same time it is impossible not to note the almost complete absence of works devoted to the study of the physical essence of the process of interaction of the tool with the rock. The progress in this field has now become an absolutely necessary condition for further improvement of the theory and practice of percussive-rotary drilling.