US 12,253,459 B2
In-situ monitoring of chemical fingerprints in oilfield applications
Adrian Cesar Cavazos Sepulveda, San Pedro Garza Garcia (MX); Damian Pablo San Roman Alerigi, Dhahran (SA); and Jose Oliverio Alvarez, Houston, TX (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Sep. 30, 2021, as Appl. No. 17/490,348.
Prior Publication US 2023/0100258 A1, Mar. 30, 2023
Int. Cl. G01N 21/27 (2006.01); E21B 49/08 (2006.01); G01N 21/35 (2014.01); G01N 21/552 (2014.01); G01N 21/85 (2006.01); G01N 33/28 (2006.01); G01V 8/02 (2006.01)
CPC G01N 21/27 (2013.01) [E21B 49/0875 (2020.05); G01N 21/35 (2013.01); G01N 21/552 (2013.01); G01N 21/8507 (2013.01); G01N 33/2823 (2013.01); G01V 8/02 (2013.01); G01N 2021/3595 (2013.01); G01N 2021/8528 (2013.01); G01N 2201/129 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A system for monitoring a composition, the system comprising:
an electromagnetic source that emits a beam;
one or more evanescent field sensing element inside a tubular structure, arranged in series along a flow direction of the composition generating turbulence, and configured to be in direct contact with the composition;
a waveguide that directs at least a portion of the beam to the evanescent field sensing element as an incident beam;
wherein
the evanescent field sensing element provides partial or total internal reflection of the incident beam at an interface between the evanescent field sensing element and the composition, and
the incident beam interacts with the composition to form a fingerprint beam;
a coupler that splits the beam, such that at least a portion of the beam serves as a reference beam without passing through the evanescent field sensing element;
at least one frequency comb generator that modifies both the reference beam and the incident beam with optical frequency comb (OFC); and
a detector configured to obtain a spectral distribution of the fingerprint beam.