US 12,378,882 B2
Method for performing Raman spectroscopy within a logging while drilling instrument
Harold Pfutzner, Richmond, TX (US); and Bastian Sauerer, Houston, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Dec. 14, 2022, as Appl. No. 18/065,687.
Application 18/065,687 is a division of application No. 15/978,322, filed on May 14, 2018, granted, now 11,530,611.
Prior Publication US 2023/0114341 A1, Apr. 13, 2023
Int. Cl. E21B 49/10 (2006.01); E21B 17/10 (2006.01); E21B 47/01 (2012.01); E21B 47/017 (2012.01); E21B 49/00 (2006.01); G01J 3/02 (2006.01); G01J 3/12 (2006.01); G01J 3/18 (2006.01); G01J 3/44 (2006.01); G01N 21/65 (2006.01); G01N 33/24 (2006.01); G01V 8/02 (2006.01)
CPC E21B 49/10 (2013.01) [E21B 17/1078 (2013.01); E21B 47/01 (2013.01); E21B 47/017 (2020.05); E21B 47/0175 (2020.05); E21B 49/00 (2013.01); G01J 3/0286 (2013.01); G01J 3/0291 (2013.01); G01J 3/18 (2013.01); G01J 3/44 (2013.01); G01J 3/4412 (2013.01); G01N 21/65 (2013.01); G01N 33/24 (2013.01); G01N 33/241 (2013.01); G01V 8/02 (2013.01); G01J 3/0264 (2013.01); G01J 2003/1208 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method, comprising:
cutting a fresh surface in a wall of a borehole extending through a formation with one or more blades of a downhole tool;
taking a Raman spectroscopy measurement of the fresh surface from within the borehole extending through the formation before the fresh surface is exposed to borehole fluids with a Raman spectroscopy measurement system, the Raman spectroscopy measurement system including:
a light source disposed in a first cavity in an outer surface of a blade of the one or more blades, wherein the first cavity is enclosed by a first window flush with the outer surface of the blade;
a filter disposed in a second cavity in the outer surface of the blade, wherein the second cavity is enclosed by a second window flush with the outer surface of the blade; and
a light detector disposed in the second cavity;
generating a Raman spectrum from the Raman spectroscopy measurement; and
determining kerogen maturity in the formation from the Raman spectrum.