公开(公告)号：EP1412605A2

公开(公告)日：2004-04-28

申请号：EP02737532.8

申请日：2002-06-19

申请人： Rotary Drilling Technology, LLC. ,  APS Technology, Inc.

发明人： HARVEY, Peter, R. ,  WOODS, Michael, J. ,  KRASE, Steve, J. ,  BURGESS, Daniel, E. ,  WASSELL, Mark, Ellsworth

IPC分类号： E21B1/00

CPC分类号： E21B17/1014 ,  E21B17/1064 ,  E21B23/04 ,  E21B47/01

摘要： A stabilizer (1) especially adapted for use with an drill string having an eccentric drilling element, such as a bi-center bit. The stabilizer (1) has a pair of circumferentially displaced blades (18) that lie in a common circumferential plane and extend from a rotatable sleeve (20) supported on the stabilizer body (50) , as well as a stationary blade (17). The rotating blades (18) are aligned with the stationary blade (17) when in a first circumferential orientation and are disposed so that the mid-point between the rotating blades (18) is located opposite the stationary blade (17), thereby providing full-gauge stabilization, when the rotating blades (18) are in a second circumferential orientation. A magnetic system (60) senses the circumferential orientation of the rotating blades (18) and transmits the information to the surface via mud pulse telemetry. A piston (141) actuated by the drilling mud locks the rotating blades (18) into the active and inactive positions. A brake shoe (59) located on the distal end of each rotating blade (18) provides contact with the walls of the borehole and serves as a support pad (59) for a formation sensor (45).