公开(公告)号：US10082020B2

公开(公告)日：2018-09-25

申请号：US15109444

申请日：2014-10-24

申请人： HALLIBURTON ENERGY SERVICES, INC.

发明人： Laurence T. Wisniewski ,  Gary L. Fickert ,  Michael Simmons ,  Gary Kainer ,  Chung Chang

IPC分类号： G01V1/40 ,  E21B47/14 ,  G01V1/52 ,  E21B28/00 ,  E21B31/00 ,  E21B47/00 ,  E21B49/00 ,  G01V1/145 ,  G01V1/02

CPC分类号： E21B47/14 ,  E21B28/00 ,  E21B31/005 ,  E21B47/0005 ,  E21B49/00 ,  G01V1/145 ,  G01V1/159 ,  G01V1/52

摘要： According to embodiments of the disclosure, a downhole tool for taking acoustic measurements in a wellbore is provided. The tool may have an acoustic dipole transmitter with a piston made from a soft magnetic material, mounted on a centering spring between the first coil and the second coil, which moves the piston bi-directionally along a longitudinal axis when energized. The tool may also have a feedback winding on at least one of the first or second coils. The tool may also have a circuit for energizing the first and second coils which includes an input for receiving a signal responsive to the position of the piston relative to the coils and a processor for determining an output waveform used to generate an acoustic signal.