公开(公告)号：WO2022212535A1

公开(公告)日：2022-10-06

申请号：PCT/US2022/022588

申请日：2022-03-30

Applicant: SAUDI ARABIAN OIL COMPANY ,  ARAMCO SERVICES COMPANY

Inventor： CAVAZOS SEPULVEDA, Adrian, Cesar ,  SAN ROMAN ALERIGI, Damian, Pablo

IPC: G01N21/552 ,  G01N21/35 ,  G01N21/45 ,  E21B49/0875 ,  G01N2021/3595 ,  G01N2021/458 ,  G01N2201/082 ,  G01N2201/088 ,  G01N33/54373

Abstract: A sensing system (16) for monitoring a composition of a downhole fluid (15) in a well (16), where the sensing system (16) includes: a light source (41), a waveguide (21), an evanescent field sensing element (22) that is indirect contact with a downhole fluid (15), and a detector (25, 43, 53, 63). The light source (41) is operable for emitting a beam and includes a frequency comb generator (42) configured to modify at least a portion of the beam into a sensing comb beam. The evanescent field sensing element (22) provides attenuated internal reflection of the sensing comb beam at the interface between the evanescent field sensing element (22) and the downhole fluid (15), and the portion of the sensing comb beam interacts with the downhole fluid (15) to form at least a portion of an interacted beam. The detector (25, 43, 53, 63) obtains a spectral distribution of the interacted beam.