METHOD AND APPARATUS FOR IDENTIFYING ROCK PROPERTIES AND DRILLING SYSTEM INCORPORATING THE APPARATUS.

摘要

P Acoustic signals generated by the drilling of a borehole by a drill bit are received at sensors (310, 320, 330) placed in the drill string. The acoustic signals received by the sensors are processed, for example using a Fourier transform, and a characteristic of the acoustic signals is used to identify the lithology, the rock resistance, the presence of oil, the presence of gas, the change in lithology or the like. / P