06178815 is referenced by 77 patents and cites 6 patents.

The present invention provides a method for improving the quality of a formation fluid sample by taking the sample at a time when the formation fluid composition contains the most favorable portion of hydrocarbons. This task is accomplished by determining in real-time, the composition of the fluid flowing into a downhole tool from the formation. This method determines the optical density of the fluid as the fluid flows through the tool. An optical spectrum is generated from the density measurement. The optical spectrum is compared to a composite spectrum generated from a database of known fluid samples. As a result of the comparisons, there is a determination of the derivations between corresponding features of the two spectra. Adjustments are made to the components of the composite spectrum until the deviations between the two spectra are at an acceptable minimum. Determinations of the fluid composition are made from the composition of the composite spectrum at the minimum deviation. The sampling process begins when the fluid composition has a desirable fractional component of hydrocarbons in the fluid.

Title
Method to improve the quality of a formation fluid sample
Application Number
9/126513
Publication Number
6178815 (B2)
Application Date
July 30, 1998
Publication Date
January 30, 2001
Inventor
Robert J Butsch
Tomball
TX, US
Charles W Morris
The Woodlands
TX, US
Michelle Mary Felling
Houston
TX, US
Agent
Steven L Christian
US
Brigitte L Jeffery
US
John J Ryberg
US
Assignee
Schlumberger Technology Corporation
TX, US
IPC
E21B 47/10
View Original Source