Apparatus and method for positioning a measurement device at a subsurface location to conduct in-situ monitoring of hydrogen levels

Abstract

A measurement device adapted for determining one or more parameters related to hydrogen at a subsurface location, including: one or more hangers adapted to affix the measurement device to the subsurface location; 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 to a respective one of the plurality of centralizer arms; and a plurality of optical probes each disposed at another of the distal portion or the proximal portion of the interior space and proximate to a same or different one of the plurality of centralizer arms. The plurality of fiber optic Raman probes are adapted to measure a hydrogen concentration in a downhole measurement and the plurality of optical probes are adapted to measure downhole local gas holdup.

What is claimed is: 
     
         1 . A method for determining one or more parameters related to hydrogen at a subsurface location, comprising:
 lowering a measurement device to the subsurface location using cabling;   affixing the measurement device to the subsurface location by expanding one or more hangers of the measurement device;   detaching and withdrawing the cabling from the measurement device; and   receiving data from the measurement device, wherein the measurement device comprises:
 the one or more hangers adapted to affix the measurement device to the subsurface location; 
 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 to 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 to 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 centralizer arms comprise at least six (6) bowspring centralizer arms, and the fiber optic Raman probes comprise six (6) fiber optic Raman probes that are disposed proximate to respective ones of the at least six (6) centralizer arms at 60 degrees from one another around an interior perimeter of the measurement device.   
     
     
         2 . The method according to  claim 1 , wherein the measurement device further comprises one or more flowmeters disposed at the proximal portion or the distal portion of the interior space. 
     
     
         3 . The method according to  claim 2 , wherein the measurement device further comprises another one or more flowmeters disposed at another of the proximal portion or the distal portion of the interior space. 
     
     
         4 . The method according to  claim 3 , wherein the one or more flowmeters and the another one or more flowmeter are rotationally offset from one another in relation to a longitudinal axis along the measurement device. 
     
     
         5 . The method according to  claim 1 , wherein the plurality of fiber optic Raman probes and the plurality of optical probes are disposed at respective interior perimeters having diameters that are fractions of respective outer circumference diameters formed by the plurality of centralizer arms. 
     
     
         6 . The method according to  claim 1 , wherein the plurality of fiber optic Raman probes are disposed proximate to same ones of the plurality of centralizer arms as the plurality of optical probes. 
     
     
         7 . The method according to  claim 1 , wherein the plurality of fiber optic Raman probes are disposed proximate to different ones of the plurality of centralizer arms from the plurality of optical probes. 
     
     
         8 . The method according to  claim 1 , wherein the plurality of centralizer arms are bowspring centralizer arms. 
     
     
         9 . The method according to  claim 1 , wherein the plurality of fiber optic Raman probes are adapted to detect signal spectra associated with hydrogen molecules. 
     
     
         10 . The method according to  claim 9 , wherein the plurality of fiber optic Raman probes are adapted to detect signal spectra with wavenumbers at 4,100-4,175 cm −1 . 
     
     
         11 . The measurement device according to  claim 10 , wherein the measurement device further comprising a temperature probe and a pressure probe, wherein the detected signal with wavenumbers at 4,125-4,165 cm −1  are processed based on one or more of a temperature determined using the temperature probe and a pressure determined using the pressure probe. 
     
     
         12 . The method according to  claim 1 , wherein the plurality of optical probes comprise six (6) optical probes that are disposed proximate to respective ones of the at least six (6) centralizer arms at 60 degrees from one another around the interior perimeter of the measurement device. 
     
     
         13 . A method for determining one or more parameters related to hydrogen at a subsurface location, comprising:
 lowering a measurement device to the subsurface location using cabling;   affixing the measurement device to the subsurface location by expanding one or more hangers of the measurement device;   detaching and withdrawing the cabling from the measurement device; and   receiving data from the measurement device, wherein the measurement device consists of:
 the one or more hangers adapted to affix the measurement device to the subsurface location; 
 twelve bowspring centralizer arms forming an interior space having a proximal portion and a distal portion; 
 six fiber optic Raman probes each disposed at the proximal portion of the interior space and proximate to every other one of the twelve bowspring centralizer arms at 60 degrees from one another around an interior perimeter of the measurement device, said six fiber optic Raman probes being adapted to measure a hydrogen concentration in a downhole measurement; and 
 six optical probes each disposed at the distal portion of the interior space and proximate to a same one of the twelve bowspring centralizer arms, said plurality of optical probes being adapted to measure downhole local gas holdup, 
 wherein the six fiber optic Raman probes and the six optical probes are disposed at respective interior perimeters having diameters that are one half (½) to three quarters (¾) of respective outer circumference diameters formed by the twelve bowspring centralizer arms, and 
   wherein the plurality of fiber optic Raman probes are adapted to detect signal spectra with wavenumbers at 4.100-4,175 cm −1 .