06274865 is referenced by 66 patents and cites 11 patents.

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 difference between the coloration of formation fluid and the coloration of OBM filtrate. Another determines GOR of formation fluid corrected for OBM filtrate contamination. Another determines OD of formation fluid corrected for OBM filtrate contamination. Another determines conditions that would render optical density measurements invalid and sample capture premature. Another predicts the reduction of filtrate fraction for a specific extended pumping time. Another initiates sample capture when computed contamination fraction exhibits stable asymptotic convergence.

Title
Analysis of downhole OBM-contaminated formation fluid
Application Number
9/255999
Publication Number
6274865 (B1)
Application Date
February 23, 1999
Publication Date
August 14, 2001
Inventor
Oliver C Mullins
Ridgefield
CT, US
Jon J Schroer
Bear
DE, US
Agent
John L Lee
US
William B Batzer
US
Assignee
Schlumberger Technology Corporation
CT, US
IPC
G01V 8/02
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