1
Jon J Schroer, Oliver C Mullins: Analysis of downhole OBM-contaminated formation fluid. Schlumberger Technology Corporation, William B Batzer, John L Lee, August 14, 2001: US06274865 (66 worldwide citation)

A method and apparatus is provided for determining OBM filtrate fraction in a downhole fluid sample. One embodiment of the method is used when there is significant difference between the coloration of formation fluid and the coloration of OBM filtrate. Another is used when there is little or no diff ...


2
Oliver C Mullins, Jon J Shroer: Analysis of downhole OBM-contaminated formation fluid. Schlumberger Technology Corporation, William B Batzer, John L Lee, February 26, 2002: US06350986 (57 worldwide citation)

A method and apparatus is provided for determining a quality of downhole fluid. A series of measurements are taken of at least one parameter of borehole fluid that is indicative of OBM filtrate contamination. By curve-fitting, the series of the measured parameter values are used to create an asympto ...