1
Xiao Ming Tang: Imaging near-borehole structure using directional acoustic-wave measurement. Baker Hughes Incorporated, Madan Mossman & Sriram P C, April 25, 2006: US07035165 (31 worldwide citation)

Directional acoustic measurements made in the borehole are used for imaging a near-borehole geological formation structure and determination of its orientation. Four-component cross-dipole data set measured in a deviated borehole in combination with the directionality of the compressional waves in t ...


2
Xiao Ming Tang, Tsili Wang, Douglas J Patterson, James V Leggett III, Vladimir Dubinsky: Method and apparatus for LWD shear velocity measurement. Baker Hughes Incorporated, Madan Mossman & Sriram P C, August 16, 2005: US06930616 (21 worldwide citation)

Array quadrupole data obtained in a LWD environment are processed to determine the shear velocity of an earth formation taking into account dispersion effects caused by the logging tool. When this processing is done in an azimuthally anisotropic formation, the shear velocity that is obtained is the ...


3
Xiao Ming Tang, Douglas J Patterson, Tsili Wang, James V Leggett III, Vladimir Dubinksy: Method and apparatus for LWD shear velocity measurement. Baker Hughes Incorporated, Madan Mossman & Sriram P C, February 1, 2005: US06850168 (21 worldwide citation)

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 ...


4
Xiao Ming Tang: Method and apparatus for determining earth formation shear-wave transverse isotropy from borehole stoneley-wave measurements. Baker Hughes Incorporated, Madan Mossman & Sriram P C, July 19, 2005: US06920082 (13 worldwide citation)

The present invention is a method of determining formation horizontal shear wave velocity, formation transverse isotropy and an effective logging tool modulus. The method comprises determining an effective logging tool modulus by modeling the logging tool as a fluid filled cylindrical shell. Measure ...


5
Xiao Ming Tang, Alexei Bolshakov, Tsili Wang, Douglas Patterson: Method and apparatus for cement bond evaluation using transversely polarized shear waves. Baker Hughes Incorporated, Bracewell & Guiliani, April 28, 2009: US07525872 (12 worldwide citation)

A method and apparatus useful to determine the integrity of a cement bond log disposed in the annular space between a casing and a wellbore. The method and apparatus produce a transversely polarized shear wave and emit the wave through the casing and into the wellbore. The transversely polarized she ...


6
Berthold Kriegshauser, Otto N Fanini, Richard A Mollison, Liming Yu, Tsili Wang, Xiao Ming Tang: Method of using electrical and acoustic anisotropy measurements for fracture identification. Baker Hughes Incorporated, Madan Mossman & Sriram P C, August 2, 2005: US06925031 (12 worldwide citation)

Measurements made by a cross-dipole acoustic logging tool in a borehole are processed to determine the principal directions of azimuthal anisotropy of a subsurface formation. Measurements indicative of azimuthal resistivity variations are also made with a multicomponent induction logging tool. These ...


7
Xiao Ming Tang, Douglas J Patterson, Tsili Wang, James V Leggett III, Vladimir Dubinksy: Method and apparatus for LWD shear velocity measurement. Baker Hughes Incorporated, Madan Mossman & Sriram P C, January 10, 2006: US06985086 (9 worldwide citation)

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 ...


8
Alexei Bolshakov, Vladimir Dubinsky, Xiao Ming Tang, Douglas J Patterson, Dimitri Donskoy, Joseph Gregory Barolak: Casing resonant radial flexural modes in cement bond evaluation. Baker Hughes Incorporated, Bracewell & Giuliani, March 23, 2010: US07681450 (9 worldwide citation)

A method useful for evaluating the presence and/or the quality of the cement bond of a downhole tubular. The method involves measuring radial resonance modes of the tubular, and comparing those measured values to the unbound tubular resonant values of a calibration ring. For a well bonded tubular, t ...


9
Douglas J Patterson, Xiao Ming Tang, Alexei Bolshakov: Active noise cancellation through the use of magnetic coupling. Baker Hughes Incorporated, Madan & Sriram P C, December 29, 2009: US07639562 (7 worldwide citation)

Passive and active suppression of casing signals is used to improve the ability to measure formation velocities. Passive suppression includes the use of a magnet slidably coupled to the casing. Active suppression uses measurement of casing signals to control the output of an electromechanical acoust ...


10
Xiao Ming Tang, Yibing Zheng, Douglas J Patterson: Method for processing acoustic reflections in array data to image near-borehole geological structure. Baker Hughes Incorporated, Bracewell & Guiliani, February 17, 2009: US07492664 (7 worldwide citation)

A method and apparatus for enhancing the moveout between a direct wave and a reflected wave. The method involves transmitting imaging signals into a body to be imaged and receiving the resulting signals propagated from the signal source. The step of receiving the propagated signals includes selectiv ...