US 12,281,570 B1
Apparatus and method for in-situ monitoring of hydrogen levels at a subsurface location
Ibrahim Alobaidan, Dammam (SA); Abdallah A. Alshehri, Dhahran (SA); Klemens Katterbauer, Dhahran (SA); and Ali Abdallah AlYousef, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Apr. 15, 2024, as Appl. No. 18/635,909.
Int. Cl. E21B 49/08 (2006.01); E21B 17/10 (2006.01)
CPC E21B 49/0875 (2020.05) [E21B 17/1021 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A sonde adapted for determining one or more parameters related to hydrogen at a subsurface location, comprising:
a plurality of centralizer arms forming an interior space having a proximal portion and a distal portion;
a plurality of fiber optic Raman probes each disposed at the proximal portion or the distal portion of the interior space and proximate a respective one of the plurality of centralizer arms, said plurality of fiber optic Raman probes being adapted to measure a hydrogen concentration in a downhole measurement; and
a plurality of optical probes each disposed at another of the distal portion or the proximal portion of the interior space and proximate a same or different one of the plurality of centralizer arms, said plurality of optical probes being adapted to measure downhole local gas holdup,
wherein the plurality of fiber optic Raman probes are adapted to detect signal bands of hydrogen molecules,
wherein the plurality of fiber optic Raman probes are adapted to detect signal spectra with wavenumbers at about 4,100-4,175 cm−1, and
wherein a detected signal with wavenumbers at about 4,125-4,165 cm−1 is processed based on one or more of a temperature determined using a temperature probe and a pressure determined using a pressure probe.