公开(公告)号：EP0753161A1

公开(公告)日：1997-01-15

申请号：EP95912370.0

申请日：1995-03-27

申请人： GEC-MARCONI LIMITED

发明人： BERESFORD, John, Michael ,  CROWTHER, Paul, Andrew

IPC分类号： B06B1 ,  E21B21 ,  E21B28 ,  E21B47 ,  E21B49 ,  G01V1

CPC分类号： B06B1/0611 ,  B06B1/0618 ,  E21B21/08 ,  E21B28/00 ,  E21B47/011 ,  E21B49/00 ,  G01V1/04 ,  G01V1/18 ,  G01V1/52

摘要： An acoustic sensor for use as part of a drill string (1) in a borehole (2) has an acoustic transducer (4) which vibrates the drill bit in contact with the rock at the end of the borehole to generate acoustic signals in the rock. These acoustic signals propagate through the rocks ahead of the drill bit and are reflected and scattered to return to an acoustic sensor contained within the drill string.