1
Chengli Dong, Peter S Hageman, Oliver C Mullins, Go Fujisawa, Soraya S Betancourt, Julian Pop, Andrew L Kurkjian, Toru Terabayashi, Hani M Elshahawi: Determining fluid properties from fluid analyzer. Schlumberger Technology Corporation, J L Jennie Salazar, Victor H Segura, Brigitte L Echols, October 18, 2005: US06956204 (28 worldwide citation)

A method for determining properties of a formation fluid including obtaining data related to an optical density at a methane peak and an optical density at an oil peak for a fluid sample at a plurality of times, calculating an apparent gas-oil-ratio of the sample fluid from the optical density of th ...


2
Darcy Freemark, Craig Borman, Ahmed Hammami, Moin Muhammed, Scott Jacobs, Jonathan W Brown, Andrew L Kurkjian, Chengli Dong, Brindesh Dhruva, Kenneth L Havlinek, Anthony R H Goodwin: Fluid analysis method and apparatus. Schlumberger Technology Corporation, Dave R Hofman, Darla Fonseca, Jaime Castano, December 2, 2008: US07458252 (24 worldwide citation)

A fluid analysis assembly for analyzing a fluid the fluid analysis assembly includes a chamber, a fluid movement device, a pressurization assembly and at least one sensor. The chamber defines an evaluation cavity for receiving the fluid. The fluid movement device has a force medium applying force to ...


3
Anthony R H Goodwin, Pete Hegeman, Kai Hsu, Chengli Dong: Methods and apparatus for the downhole characterization of formation fluids. Schlumberger Technology Corporation, Dave R Hofman, Darla Fonseca, Jaime Castano, May 5, 2009: US07526953 (24 worldwide citation)

Methods and apparatus for investigating a hydrocarbon bearing geological formation traversed by a borehole are disclosed. An example method to characterize a fluid associated with an underground geological formation obtains a sample of the fluid associated with the underground geological formation. ...


4
Lalitha Venkataramanan, Go Fujisawa, Bhavani Raghuraman, Oliver Mullins, Andrew Carnegie, Ricardo Vasques, Chengli Dong, Kai Hsu, Michael O Keefe, Henri Pierre Valero: System and methods of deriving fluid properties of downhole fluids and uncertainty thereof. Schlumberger Technology Corporation, Karan Singh, Vincent Loccisano, Jody Lynn DeStefanis, December 4, 2007: US07305306 (19 worldwide citation)

Methods and systems are provided for downhole analysis of formation fluids by deriving fluid properties and associated uncertainty in the predicted fluid properties based on downhole data, and generating answer products of interest based on differences in the fluid properties. Measured data are used ...


5
Youxiang, Oliver C Mullins, Jinglin Gao, Abdel M Kharrat, Kentaro Indo, Michael O Keefe, Soraya S Betancourt, Chengli Dong, Francois Dubost: Methods and apparatus for analysis of downhole asphaltene gradients and applications thereof. Schlumberger Technology Corporation, Jay P Sbrollini, Wayne I Kanak, August 9, 2011: US07996154 (18 worldwide citation)

A method and system for characterizing asphaltene gradients of a reservoir of interest and analyzing properties of the reservoir of interest based upon such asphaltene gradients. The analysis employs a correlation that relates insoluble asphaltene concentration to spectrophotometry measurement data ...


6
Oliver C Mullins, Go Fujisawa, Chengli Dong, Andrew Kurkjian, John Nighswander, Toru Terabayashi, Satoko Yoshida, Hideki Kinjo, Henning Groenzin: Determining dew precipitation and onset pressure in oilfield retrograde condensate. Schlumberger Technology Corporation, Jody Lynn DeStefanis, John L Lee, Dale Gaudier, February 21, 2006: US07002142 (14 worldwide citation)

A method and apparatus detects dew precipitation and determines dew precipitation onset pressure in a sample of formation fluid located downhole in an oilfield reservoir. In a preferred embodiment, the method includes (a) isolating a sample of formation fluid downhole; (b) illuminating the sample do ...


7
Toru Terabayashi, Tsutomu Yamate, Hideki Kinjo, Akihito Chikenji, Takeaki Nakayama, Oliver C Mullins, Soraya S Betancourt, Michael O Keefe, Chengli Dong: Method of downhole characterization of formation fluids, measurement controller for downhole characterization of formation fluids, and apparatus for downhole characterization of formation fluids. Schlumberger Technology Corporation, Daryl Wright, Jody DeStefanis, Jeff Griffin, September 7, 2010: US07788972 (13 worldwide citation)

A method of downhole characterization of formation fluids is provided. The method includes: estimating a rough value of the bubble point pressure of the formation fluids; depressurizing the formation fluids at a first speed to a certain pressure which is a predetermined value higher than the estimat ...


8
Kai Hsu, Peter S Hegeman, Chengli Dong, Ricardo Vasques: Methods and apparatus to monitor contamination levels in a formation fluid. Schlumberger Technology Corporation, David J Smith, September 20, 2011: US08024125 (13 worldwide citation)

Apparatus and methods to monitor contamination levels in a formation fluid are disclosed. An example method involves obtaining first property data indicative of a first fluid property of a formation fluid and second property data indicative of a second fluid property of the formation fluid. A correl ...


9
Chengli Dong, Soraya S Betancourt, Go Fujisawa, Oliver C Mullins, James J Dunlap: Determining phase transition pressure of downhole retrograde condensate. Schlumberger Technology Corporation, John L Lee, Jody Lynn DeStefanis, William L Wang, July 11, 2006: US07075063 (12 worldwide citation)

The invention provides a method for determining phase transition pressure of downhole retrograde condensate. An OBM-contamination value is produced from a time-series of fluorescence values produced by measuring fluorescence emitted from a single-phase flow of OBM-contaminated formation fluid in a d ...


10
Peter Hegeman, Chengli Dong, Charles Woodburn, Graham Birkett, Nikos Varotsis, Vassilis Gaganis: Predicting formation fluid property through downhole fluid analysis using artificial neural network. Schlumberger Technology Corporation, David J Smith, Dave R Hofman, June 21, 2011: US07966273 (12 worldwide citation)

Apparatus and methods to perform downhole fluid analysis using an artificial neural network are disclosed. A disclosed example method involves obtaining a first formation fluid property value of a formation fluid sample from a downhole fluid analysis process. The first formation fluid property value ...