1
Wu Peter T: Apparatus and method for determining properties of anisotropic earth formations. Anadrill Int, Schlumberger Services Petrol, December 29, 1997: EP0814349-A2 (32 worldwide citation)

A method is disclosed for determining the horizontal resistivity, vertical resistivity, and dip of formations surrounding a bore-hole, comprising the following steps:(a) suspending a logging device in the borehole; (b) transmitting electromagnetic energy from a transmitter location on the logging de ...


2
Liu Cheng Bing, Smits Jan W, Li Qiming, Wu Peter T: Diagnosis of environmental influence on well logs with model-based inversion. Schlumberger Holdings, January 14, 2004: GB2390712-A (25 worldwide citation)

A method for identifying environmental effects in well log data includes selecting a plurality of models, each of the plurality of models including at least one parameter to be optimized; fitting the models to the well log data by optimizing the at least one parameter, the fitting producing a plural ...


3
WU PETER T: Real-time formation anisotropy and dip evaluation using tri-axial induction measurements. Schlumberger Canada, Fonseca Darla P, July 28, 2011: WO/2011/091216 (14 worldwide citation)

The present disclosure relates to a method to determine a formation property of a subsurface formation. A downhole logging tool having two or more tri-axial antennas is provided and used to obtain azimuthally sensitive data. Borehole correction is performed on the obtained data and a ZD-inversion is ...


4
Clark Brian, Wu Peter T, Grijalva Victor E: Well logging apparatus and method with borehole compensation. Anadrill Int, Schlumberger Services Petrol, June 5, 1996: EP0715188-A2 (9 worldwide citation)

A well logging apparatus and technique for measuring formation resistivity is disclosed which provides advantages of borehole compensation without the requirement of having, for each transmitter to receiver pair spacing, an "equal and opposite" transmitter with the same spacing on the other side of ...


5
Wu Peter T, Tabanou Jacques R: Well logging method and apparatus. Anadrill Int, Schlumberger Services Petrol, September 3, 1997: EP0793119-A2 (6 worldwide citation)

A well logging method and apparatus are disclosed for determining borehole corrected formation resistivity, borehole diameter, and borehole fluid (mud) resistivity with improved accuracy. A logging device in the borehole transmits electromagnetic energy from a transmitter, which energy is received a ...


6
Wu Peter T, Hawthorn Andrew, Bratton Tom R, Sinha Bikash K: Well logging while a mud pump is off. Schlumberger Holdings, October 4, 2006: GB2424707-A (2 worldwide citation)

Well logging is carried out during a period when a mud pump is turned off. Data corresponding to a quiet period is extracted. The quiet period corresponds to the time when the data is free from interference resulting from the pump being turned on and off. The state of the pump may be detected by mon ...


7
Wu Peter T, Tabanou Jacques R: Well logging apparatus and method. Anadrill Int, Schlumberger Services Petrol, January 7, 1998: EP0816871-A2 (2 worldwide citation)

A method and apparatus is disclosed for determining the properties of formations surrounding an earth borehole that have been invaded by borehole fluid to form an invaded zone. Properties determined in one embodiment are invaded zone resistivity (Rxo), diameter of invasion (DI), and uninvaded format ...


8
Wu Peter T, Pabon Jahir: Determining anisotropy of an earth formation. Schlumberger Holdings, June 18, 2008: GB2444832-A (2 worldwide citation)

A method for determining anisotropy of an earth formation surrounding a borehole comprises emitting acoustic signals into the formation from a first location in the borehole, receiving the acoustic signals at at least one second location spaced along the borehole from the first location and producin ...


9
WU Peter T, BARBER Thomas D: [fr] EVALUATION DE PENDAGE ET DANISOTROPIE DE FORMATION EN TEMPS RÉEL À LAIDE DE MESURES DINDUCTION MULTIAXIALE, [en] REAL-TIME FORMATION ANISOTROPY AND DIP EVALUATION USING MULTIAXIAL INDUCTION MEASUREMENTS. WU Peter T, BARBER Thomas D, SCHLUMBERGER CANADA, SERVICES PETROLIERS SCHLUMBERGER, SCHLUMBERGER HOLDINGS, Schlumberger Technology, PRAD RESEARCH AND DEVELOPMENT, HEWITT Cathy, March 14, 2013: WO/2013/036509 (1 worldwide citation)

[en] Methods and systems are provided for logging a formation by combining results for a zero-dimensional inversion of conductivity measurements with results for a higher-order inversion of a subset of the conductivity measurement. The higher order inversion can include a 1D-radial portion and a 1D- ...


10
WU Peter T, DONG Weixin, BARBER Thomas D, HOMAN Dean: DÉTECTION DUNE FRACTURE ET ÉVALUATION DE LORIENTATION DUNE FRACTURE EN TEMPS RÉEL, REAL-TIME FRACTURE DETECTION AND FRACTURE ORIENTATION ESTIMATION. SCHLUMBERGER CANADA, SERVICES PETROLIERS SCHLUMBERGER, SCHLUMBERGER HOLDINGS, Schlumberger Technology, PRAD RESEARCH AND DEVELOPMENT, WU Peter T, DONG Weixin, BARBER Thomas D, HOMAN Dean, FONSECA Darla, March 22, 2012: WO/2012/037340 (1 worldwide citation)

A method for determining existence of a fracture in a formation surrounding a wellbore drilled through subsurface rock formations includes calculating vertical resistivity, horizontal resistivity, apparent formation dip, apparent formation azimuth and axial resistivity for a plurality of longitudina ...