DRILLING METHOD AND APPARATUS

摘要

A method of locating a drilling apparatus and/or a borehole in a subterranean region. The method may include the steps of transmitting seismic waves into the subterranean region during a subterranean drilling operation, the seismic waves being transmitted from a location remote from the drilling apparatus, detecting a seismic response from the drilling apparatus or borehole, and comparing the detected response with predetermined seismic survey data of the subterranean region to determine the location of the apparatus or borehole.