05266800 is referenced by 72 patents and cites 19 patents.

Methods for distinguishing among oil samples, and more particularly between a fluid containing oil base mud and formation oil samples are described. The methods all rely on the discovery that the optical absorption spectrum of all crude oils in the visible and near infrared spectra can be described according to the equation OD=ae.sup.Eb, where (OD) is a measured optical density, (b) is a value between 0.37 and 0.55 chosen according to the wavenumber (E) and can be chosen as a constant equal to 4.6.times.10.sup.-4 cm, and (a) is an unknown which classifies the crude oil. By making measurements and solving for (a), a crude oil can be classified. In a flow stream which has a changing oil content, such as may be obtained by a borehole tool which obtains fluid samples from the formation, by monitoring the unknown (a), a determination may be made as to when a formation oil is being obtained as opposed to a mud filtrate.

Title
Method of distinguishing between crude oils
Application Number
7/955100
Publication Number
5266800
Application Date
October 1, 1992
Publication Date
November 30, 1993
Inventor
Oliver C Mullins
Ridgefield
CT, US
Agent
Leonard W Pojunas
David P Gordon
Assignee
Schlumberger Technology Corporation
NY, US
IPC
G01N 21/35
G01N 21/31
G01V 9/04
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