Patents by Inventor Vladimir Dubinksy

Vladimir Dubinksy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for LWD shear velocity measurement
    Patent number: 6985086
    Abstract: The logging tool of this invention includes a transmitter conveyed on a drilling collar for exciting a quadrupole signal in a borehole being drilled by a drill bit and a receiver for receiving the signal. The transmitter is operated at a frequency below the cut-off frequency of the quadrupole collar mode. The received signal consists primarily of the formation quadrupole mode which, at low frequencies, has a velocity that approaches the formation shear velocity. The transmitter, in one embodiment, consists of eight equal sectors of a piezoelectric cylinder mounted on the rim of the drilling collar. The value of the cut-off frequency is primarily dependent on the thickness of the drilling collar. Alternatively, the transmitter may be operated to produce both the collar mode and the formation mode and a processor may be used to filter out the collar mode.
    Type: Grant
    Filed: October 4, 2004
    Date of Patent: January 10, 2006
    Assignee: Baker Hughes Incorporated
    Inventors: Xiao Ming Tang, Douglas J. Patterson, Tsili Wang, James V. Leggett, III, Vladimir Dubinksy
  • Method and apparatus for LWD shear velocity measurement
    Publication number: 20050078555
    Abstract: The logging tool of this invention includes a transmitter conveyed on a drilling collar for exciting a quadrupole signal in a borehole being drilled by a drill bit and a receiver for receiving the signal. The transmitter is operated at a frequency below the cut-off frequency of the quadrupole collar mode. The received signal consists primarily of the formation quadrupole mode which, at low frequencies, has a velocity that approaches the formation shear velocity. The transmitter, in one embodiment, consists of eight equal sectors of a piezoelectric cylinder mounted on the rim of the drilling collar. The value of the cut-off frequency is primarily dependent on the thickness of the drilling collar. Alternatively, the transmitter may be operated to produce both the collar mode and the formation mode and a processor may be used to filter out the collar mode.
    Type: Application
    Filed: October 4, 2004
    Publication date: April 14, 2005
    Applicant: Baker Hughes Incorporated
    Inventors: Xiao Tang, Douglas Patterson, Tsili Wang, James Leggett, Vladimir Dubinksy
  • Method and apparatus for LWD shear velocity measurement
    Patent number: 6850168
    Abstract: The logging tool of this invention includes a transmitter conveyed on a drilling collar for exciting a quadrupole signal in a borehole being drilled by a drill bit and a receiver for receiving the signal. The transmitter is operated at a frequency below the cut-off frequency of the quadrupole collar mode. The received signal consists primarily of the formation quadrupole mode which, at low frequencies, has a velocity that approaches the formation shear velocity. The transmitter, in one embodiment, consists of eight equal sectors of a piezoelectric cylinder mounted on the rim of the drilling collar. The value of the cut-off frequency is primarily dependent on the thickness of the drilling collar. Alternatively, the transmitter may be operated to produce both the collar mode and the formation mode and a processor may be used to filter out the collar mode.
    Type: Grant
    Filed: November 7, 2001
    Date of Patent: February 1, 2005
    Assignee: Baker Hughes Incorporated
    Inventors: Xiao Ming Tang, Douglas J. Patterson, Tsili Wang, James V. Leggett, III, Vladimir Dubinksy