1
Srinivasa Chakravarthy, Pravin Gupta, Raghu Chunduru, Berthold F Kriegshauser, Otto N Fanini: Conductivity anisotropy estimation method for inversion processing of measurements made by a transverse electromagnetic induction logging instrument. Western Atlas International, Richard A Fagin, March 28, 2000: US06044325 (97 worldwide citation)

A method for generating an improved estimate of horizontal conductivity, dip angle, azimuth and anisotropy parameter of an earth formation penetrated by a wellbore from dual-frequency transverse electromagnetic induction measurements, comprising generating an initial estimate of the horizontal condu ...


2
Stanislav Forgang, Otto N Fanini, Leonty A Tabarovsky: Method and apparatus for transverse electromagnetic induction well logging. Western Atlas International, Richard A Fagin, July 14, 1998: US05781436 (93 worldwide citation)

A method of measuring the conductivity of earth formations penetrated by a wellbore. The method comprises selectively passing an alternating current through transmitter coils inserted into the wellbore. Each of the transmitter coils has a magnetic moment direction different from the magnetic moment ...


3
David Beard, Carlos Yansig, Robert A Lester: Synchronized digital stacking method and application to induction logging tools. Western Atlas International, Darryl M Springs, Richard A Fagin, September 26, 1995: US05452761 (78 worldwide citation)

An apparatus and method for digitally processing signals received by an induction logging tool having a transmitter and a plurality of receivers. An oscillating signal is provided to the transmitter, which causes eddy currents to flow in a surrounding formation. The magnitudes of the eddy currents a ...


4
Pravin Gupta, Berthold F Kriegshauser, Otto N Fanini: Conductivity anisotropy estimation method for inversion processing of measurements made by a transverse electromagnetic induction logging instrument. Western Atlas International, Richard A Fagin, December 7, 1999: US05999883 (76 worldwide citation)

A method for determining an initial estimate of the horizontal conductivity and the vertical conductivity of an anisotropic earth formation. Electromagnetic induction signals induced by induction transmitters oriented along three mutually orthogonal axes are measured. One of the mutually orthogonal ...


5
Michael Yesudas, John M Michaels, Saeed Rafie, Than Shwe: Determining fluid properties from pressure, volume and temperature measurements made by electric wireline formation testing tools. Western Atlas International, Richard A Fagin, June 3, 1997: US05635631 (71 worldwide citation)

A method of determining an amount of dissolved gas in a fluid sample is disclosed. The method includes hydraulically confining and expanding the sample while measuring pressure and volume. A first volume and pressure are determined at which the rate of change in pressure with respect to volume devia ...


6
Saeed Rafie, Stephen T Ha, Josephine Lopez, James C Hunziker, Mark R Doyle: Combination fiber-optic/electrical conductor well logging cable. Western Atlas International, Richard A Fagin, February 27, 1996: US05495547 (69 worldwide citation)

The present invention is a well logging cable including first conductor elements, each of the first elements consisting of a steel wire surrounded by copper strands and covered in an electrically insulating material, and at least one second conductor element including at least one optical fiber encl ...


7
Zeljko Jericevic, Gary A Sitton: Method for compression of high resolution seismic data. Western Atlas International, Richard A Fagin, May 26, 1998: US05757852 (69 worldwide citation)

A method of compressing digital signals for transmission and/or storage. The method includes lossy compressing the digital signal to generate a lossy compressed signal. The compressed signal is decompressed locally to generate a local lossy decompressed signal. An error signal is calculated as the d ...


8
Svein Torleif Vaage, Ruben D Martinez, John Brittan: Method for separating seismic signals from two or more distinct sources. PGS Americas, E Eugene Thigpen, Richard A Fagin, April 19, 2005: US06882938 (60 worldwide citation)

A method is disclosed for separating energy resulting from actuating at least two different seismic energy sources from seismic signals. The sources are actuated to provide a variable time delay between successive actuations of a first one and a second one of the sources. The method includes sorting ...


9
Stig Rune Lennart Tenghamn, Audun Sødal, Andre Stenzel: Apparatus and methods for multicomponent marine geophysical data gathering. PGS Americas, E Eugene Thigpen, Richard A Fagin, July 3, 2007: US07239577 (59 worldwide citation)

In one embodiment the invention comprises a particle velocity sensor that includes a housing with a geophone mounted in the housing. A fluid that substantially surrounds the geophone is included within the housing. The particle velocity sensor has an acoustic impedance within the range of about 750, ...


10
Kurt M Strack: Combined surface and wellbore electromagnetic measurement system and method for determining formation fluid properties. KJT Enterprises, Richard A Fagin, May 25, 2004: US06739165 (58 worldwide citation)

A method is disclosed for monitoring a reservoir. The method includes making a first set of electromagnetic measurements at locations along the Earth's surface, making a first measurement from at least one sensor disposed proximate the reservoir in a wellbore and determining an initial Earth mo ...