1
Li Gao, Bruce H Storm Jr, Lewis Norman: Method and system for determining parameters inside a subterranean formation using data sensors and a wireless ad hoc network. Halliburton Energy Services, Robert A Kent, Paul R Morico, May 24, 2005: US06898529 (36 worldwide citation)

The present invention is directed to a method and system for determining parameters inside a subterranean formation. In accordance with the present invention, a plurality of wireless data sensors are injected into the pores or fractures of a subterranean formation. The data sensors includes sensors ...


2
Li Gao, Stanley C Gianzero: Determination of conductivity in anisotropic dipping formations from magnetic coupling measurements. Halliburton Energy Services, Conley Rose & Tayon P C, May 21, 2002: US06393364 (24 worldwide citation)

A method is disclosed for the determination of horizontal resistivity, vertical resistivity, dip and strike angles of anisotropic earth formations surrounding a wellbore. Electromagnetic couplings among a plural of triad transmitters and triad receivers are measured. Each triad transmitter/receiver ...


3
Li Gao, Luis SanMartin, Stanley C Gianzero: Induction method for determining dip angle in subterranean earth formations. Halliburton Energy Services, Conley Rose P C, April 29, 2003: US06556016 (24 worldwide citation)

A method is disclosed for the determination of the dip angle of anisotropic earth formations surrounding a wellbore. Electromagnetic couplings among a plural of triad transmitters and triad receivers are measured. Each triad transmitter/receiver consists of coil windings in three mutually orthogonal ...


4
Ching wu Chu, Yuyi Xue, Li Gao, Ruling Meng, Diego Alberto Ramirez: Strong high-temperature superconductor trapped field magnets. University of Houston, Fulbright & Jaworski, February 15, 2000: US06025769 (23 worldwide citation)

A trapped field magnet formed of a high temperature type II superconductor material is disclosed. The trapped field magnet is formed of a plurality of relatively small, single-grain superconductive elements. Optimal shaped of these elements is in a regular truncated cone wherein the half cone angle ...


5
Li Gao, Paul F Rodney: Downhole signal source. Halliburton Energy Services, Conley Rose PC, May 1, 2007: US07212132 (21 worldwide citation)

A signaling apparatus comprises a magnet and a shield moveable relative to the magnet. The shield is moveable relative to the magnet between a first position in which the magnet is relatively exposed and a second position in which the magnet is relatively shielded. The apparatus can include a synchr ...


6
Li Gao, Richard A Johnson, James M Nohrden: Receiver with multi-tone wideband I/Q mismatch calibration and method therefor. Silicon Laboratories, Polansky & Associates P L L C, Paul J Polansky, R Michael Reed, June 14, 2011: US07962113 (20 worldwide citation)

In one embodiment, a method provides multiple-tone wideband I/Q mismatch calibration. A plurality of calibration frequencies is selected within a channel. A calibration tone is applied to the channel at each of the plurality of calibration frequencies. An I/Q mismatch is estimated at each of the plu ...


7
Li Gao, Dinding Chen: Method and system for well telemetry. Halliburton Energy Services, John W Wustenberg, Baker Botts L, May 16, 2006: US07046164 (19 worldwide citation)

Methods and systems for borehole telemetry are disclosed. In one embodiment, a borehole telemetry system includes a coiled tubing string that is located in the borehole. A receiver is coupled to the coiled tubing string. In one possible implementation, the receiver is located inside the coiled tubin ...


8
James Masino, Li Gao, Chris Golla, Paul F Rodney: Data retrieval tags. Halliburton Energy Services, Baker Botts L, July 6, 2010: US07750808 (12 worldwide citation)

Data retrieval tags, drillstring communications systems and methods, and computer programs are disclosed. The data retrieval tag includes an insulator substrate, at least one analog memory cell disposed on the insulator substrate and an antenna coupled to the analog memory.


9
Li Gao, Stanley C Gianzero: Virtual steering of induction tool for determination of formation dip angle. Halliburton Energy Services, Conley Rose P C, April 27, 2004: US06727706 (12 worldwide citation)

A method is disclosed for using a triad induction tool to identify the formation strike and dip angles. The method can be performed in real time. In one embodiment, the method includes: (1) measuring a magnetic coupling between transmitter coils and receiver coils of a tool in the borehole; (2) obta ...


10
Stanley C Gianzero, Li Gao: Method of combining vertical and magnetic dipole induction logs for reduced shoulder and borehole effects. Halliburton Energy Services, Conley Rose P C, November 16, 2004: US06819112 (11 worldwide citation)

There is disclosed herein a method of enhancing the vertical resolution of an induction tool, in a manner that may advantageously also reduce undesirable borehole and “negative resistivity” effects. In one embodiment, the method comprises: a) obtaining a vertical magnetic dipole (VMD) response signa ...